core: nfp: Implement amiibo encryption

src/core/CMakeLists.txt

@@ -525,6 +525,9 @@ add_library(core STATIC
     hle/service/ncm/ncm.h
     hle/service/nfc/nfc.cpp
     hle/service/nfc/nfc.h
+    hle/service/nfp/amiibo_crypto.cpp
+    hle/service/nfp/amiibo_crypto.h
+    hle/service/nfp/amiibo_types.h
     hle/service/nfp/nfp.cpp
     hle/service/nfp/nfp.h
     hle/service/nfp/nfp_user.cpp

src/core/hle/service/nfp/amiibo_crypto.cpp

@@ -0,0 +1,455 @@
+// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+// SPDX-FileCopyrightText: Copyright 2017 socram8888/amiitool
+// SPDX-License-Identifier: MIT
+
+#include <array>
+#include <mbedtls/aes.h>
+#include <mbedtls/hmac_drbg.h>
+
+#include "common/fs/file.h"
+#include "common/fs/path_util.h"
+#include "common/logging/log.h"
+#include "core/hle/service/mii/mii_manager.h"
+#include "core/hle/service/nfp/amiibo_crypto.h"
+
+namespace Service::NFP::AmiiboCrypto {
+
+Service::Mii::MiiInfo AmiiboRegisterInfoToMii(const AmiiboRegisterInfo& mii_info) {
+
+    Service::Mii::MiiManager manager;
+    auto mii = manager.BuildDefault(0);
+
+    // TODO: We are ignoring a bunch of data from the amiibo mii
+
+    mii.gender = static_cast<u8>(mii_info.mii_information.gender);
+    mii.favorite_color = static_cast<u8>(mii_info.mii_information.favorite_color);
+    memcpy(mii.name.data(), mii_info.mii_name.data(), 10);
+    mii.height = mii_info.height;
+    mii.build = mii_info.build;
+
+    mii.faceline_type = mii_info.appearance_bits1.face_shape;
+    mii.faceline_color = mii_info.appearance_bits1.skin_color;
+    mii.faceline_wrinkle = mii_info.appearance_bits2.wrinkles;
+    mii.faceline_make = mii_info.appearance_bits2.makeup;
+
+    mii.hair_type = mii_info.hair_style;
+    mii.hair_color = mii_info.appearance_bits3.hair_color;
+    mii.hair_flip = mii_info.appearance_bits3.flip_hair;
+
+    mii.eye_type = static_cast<u8>(mii_info.appearance_bits4.eye_type);
+    mii.eye_color = static_cast<u8>(mii_info.appearance_bits4.eye_color);
+    mii.eye_scale = static_cast<u8>(mii_info.appearance_bits4.eye_scale);
+    mii.eye_aspect = static_cast<u8>(mii_info.appearance_bits4.eye_vertical_stretch);
+    mii.eye_rotate = static_cast<u8>(mii_info.appearance_bits4.eye_rotation);
+    mii.eye_x = static_cast<u8>(mii_info.appearance_bits4.eye_spacing);
+    mii.eye_y = static_cast<u8>(mii_info.appearance_bits4.eye_y_position);
+
+    mii.eyebrow_type = static_cast<u8>(mii_info.appearance_bits5.eyebrow_style);
+    mii.eyebrow_color = static_cast<u8>(mii_info.appearance_bits5.eyebrow_color);
+    mii.eyebrow_scale = static_cast<u8>(mii_info.appearance_bits5.eyebrow_scale);
+    mii.eyebrow_aspect = static_cast<u8>(mii_info.appearance_bits5.eyebrow_yscale);
+    mii.eyebrow_rotate = static_cast<u8>(mii_info.appearance_bits5.eyebrow_rotation);
+    mii.eyebrow_x = static_cast<u8>(mii_info.appearance_bits5.eyebrow_spacing);
+    mii.eyebrow_y = static_cast<u8>(mii_info.appearance_bits5.eyebrow_y_position);
+
+    mii.nose_type = static_cast<u8>(mii_info.appearance_bits6.nose_type);
+    mii.nose_scale = static_cast<u8>(mii_info.appearance_bits6.nose_scale);
+    mii.nose_y = static_cast<u8>(mii_info.appearance_bits6.nose_y_position);
+
+    mii.mouth_type = static_cast<u8>(mii_info.appearance_bits7.mouth_type);
+    mii.mouth_color = static_cast<u8>(mii_info.appearance_bits7.mouth_color);
+    mii.mouth_scale = static_cast<u8>(mii_info.appearance_bits7.mouth_scale);
+    mii.mouth_aspect = static_cast<u8>(mii_info.appearance_bits7.mouth_horizontal_stretch);
+    mii.mouth_y = static_cast<u8>(mii_info.appearance_bits8.mouth_y_position);
+
+    mii.mustache_type = static_cast<u8>(mii_info.appearance_bits8.mustache_type);
+    mii.mustache_scale = static_cast<u8>(mii_info.appearance_bits9.mustache_scale);
+    mii.mustache_y = static_cast<u8>(mii_info.appearance_bits9.mustache_y_position);
+
+    mii.beard_type = static_cast<u8>(mii_info.appearance_bits9.bear_type);
+    mii.beard_color = static_cast<u8>(mii_info.appearance_bits9.facial_hair_color);
+
+    mii.glasses_type = static_cast<u8>(mii_info.appearance_bits10.glasses_type);
+    mii.glasses_color = static_cast<u8>(mii_info.appearance_bits10.glasses_color);
+    mii.glasses_scale = static_cast<u8>(mii_info.appearance_bits10.glasses_scale);
+    mii.glasses_y = static_cast<u8>(mii_info.appearance_bits10.glasses_y_position);
+
+    mii.mole_type = static_cast<u8>(mii_info.appearance_bits11.mole_enabled);
+    mii.mole_scale = static_cast<u8>(mii_info.appearance_bits11.mole_scale);
+    mii.mole_x = static_cast<u8>(mii_info.appearance_bits11.mole_x_position);
+    mii.mole_y = static_cast<u8>(mii_info.appearance_bits11.mole_y_position);
+
+    // TODO: Validate mii data
+
+    return mii;
+}
+
+bool IsAmiiboValid(const EncryptedNTAG215File& ntag_file) {
+    const auto& amiibo_data = ntag_file.user_memory;
+    LOG_DEBUG(Service_NFP, "uuid_lock=0x{0:x}", ntag_file.static_lock);
+    LOG_DEBUG(Service_NFP, "compability_container=0x{0:x}", ntag_file.compability_container);
+    LOG_INFO(Service_NFP, "write_count={}", amiibo_data.write_counter);
+
+    LOG_INFO(Service_NFP, "character_id=0x{0:x}", amiibo_data.model_info.character_id);
+    LOG_INFO(Service_NFP, "character_variant={}", amiibo_data.model_info.character_variant);
+    LOG_INFO(Service_NFP, "amiibo_type={}", amiibo_data.model_info.amiibo_type);
+    LOG_INFO(Service_NFP, "model_number=0x{0:x}", amiibo_data.model_info.model_number);
+    LOG_INFO(Service_NFP, "series={}", amiibo_data.model_info.series);
+    LOG_DEBUG(Service_NFP, "fixed_value=0x{0:x}", amiibo_data.model_info.constant_value);
+
+    LOG_DEBUG(Service_NFP, "tag_dynamic_lock=0x{0:x}", ntag_file.dynamic_lock);
+    LOG_DEBUG(Service_NFP, "tag_CFG0=0x{0:x}", ntag_file.CFG0);
+    LOG_DEBUG(Service_NFP, "tag_CFG1=0x{0:x}", ntag_file.CFG1);
+
+    // Validate UUID
+    constexpr u8 CT = 0x88; // As defined in `ISO / IEC 14443 - 3`
+    if ((CT ^ ntag_file.uuid[0] ^ ntag_file.uuid[1] ^ ntag_file.uuid[2]) != ntag_file.uuid[3]) {
+        return false;
+    }
+    if ((ntag_file.uuid[4] ^ ntag_file.uuid[5] ^ ntag_file.uuid[6] ^ ntag_file.uuid[7]) !=
+        ntag_file.uuid[8]) {
+        return false;
+    }
+
+    // Check against all know constants on an amiibo binary
+    if (ntag_file.static_lock != 0xE00F) {
+        return false;
+    }
+    if (ntag_file.compability_container != 0xEEFF10F1U) {
+        return false;
+    }
+    if (amiibo_data.constant_value != 0xA5) {
+        return false;
+    }
+    if (amiibo_data.model_info.constant_value != 0x02) {
+        return false;
+    }
+    if ((ntag_file.dynamic_lock & 0xFFFFFF) != 0x0F0001) {
+        return false;
+    }
+    if (ntag_file.CFG0 != 0x04000000U) {
+        return false;
+    }
+    if (ntag_file.CFG1 != 0x5F) {
+        return false;
+    }
+    return true;
+}
+
+NTAG215File NfcDataToEncodedData(const EncryptedNTAG215File& nfc_data) {
+    NTAG215File encoded_data{};
+
+    memcpy(encoded_data.uuid2.data(), nfc_data.uuid.data() + 0x8, 2);
+    encoded_data.static_lock = nfc_data.static_lock;
+    encoded_data.compability_container = nfc_data.compability_container;
+    encoded_data.unfixed_hash = nfc_data.user_memory.unfixed_hash;
+    encoded_data.constant_value = nfc_data.user_memory.constant_value;
+    encoded_data.write_counter = nfc_data.user_memory.write_counter;
+    encoded_data.settings = nfc_data.user_memory.settings;
+    encoded_data.owner_mii = nfc_data.user_memory.owner_mii;
+    encoded_data.title_id = nfc_data.user_memory.title_id;
+    encoded_data.applicaton_write_counter = nfc_data.user_memory.applicaton_write_counter;
+    encoded_data.application_area_id = nfc_data.user_memory.application_area_id;
+    encoded_data.unknown = nfc_data.user_memory.unknown;
+    encoded_data.hash = nfc_data.user_memory.hash;
+    encoded_data.application_area = nfc_data.user_memory.application_area;
+    encoded_data.locked_hash = nfc_data.user_memory.locked_hash;
+    memcpy(encoded_data.uuid.data(), nfc_data.uuid.data(), 8);
+    encoded_data.model_info = nfc_data.user_memory.model_info;
+    encoded_data.keygen_salt = nfc_data.user_memory.keygen_salt;
+    encoded_data.dynamic_lock = nfc_data.dynamic_lock;
+    encoded_data.CFG0 = nfc_data.CFG0;
+    encoded_data.CFG1 = nfc_data.CFG1;
+    encoded_data.password = nfc_data.password;
+
+    return encoded_data;
+}
+
+EncryptedNTAG215File EncodedDataToNfcData(const NTAG215File& encoded_data) {
+    EncryptedNTAG215File nfc_data{};
+
+    memcpy(nfc_data.uuid.data() + 0x8, encoded_data.uuid2.data(), 2);
+    memcpy(nfc_data.uuid.data(), encoded_data.uuid.data(), 8);
+    nfc_data.static_lock = encoded_data.static_lock;
+    nfc_data.compability_container = encoded_data.compability_container;
+    nfc_data.user_memory.unfixed_hash = encoded_data.unfixed_hash;
+    nfc_data.user_memory.constant_value = encoded_data.constant_value;
+    nfc_data.user_memory.write_counter = encoded_data.write_counter;
+    nfc_data.user_memory.settings = encoded_data.settings;
+    nfc_data.user_memory.owner_mii = encoded_data.owner_mii;
+    nfc_data.user_memory.title_id = encoded_data.title_id;
+    nfc_data.user_memory.applicaton_write_counter = encoded_data.applicaton_write_counter;
+    nfc_data.user_memory.application_area_id = encoded_data.application_area_id;
+    nfc_data.user_memory.unknown = encoded_data.unknown;
+    nfc_data.user_memory.hash = encoded_data.hash;
+    nfc_data.user_memory.application_area = encoded_data.application_area;
+    nfc_data.user_memory.locked_hash = encoded_data.locked_hash;
+    nfc_data.user_memory.model_info = encoded_data.model_info;
+    nfc_data.user_memory.keygen_salt = encoded_data.keygen_salt;
+    nfc_data.dynamic_lock = encoded_data.dynamic_lock;
+    nfc_data.CFG0 = encoded_data.CFG0;
+    nfc_data.CFG1 = encoded_data.CFG1;
+    nfc_data.password = encoded_data.password;
+
+    return nfc_data;
+}
+
+u32 GetTagPassword(const TagUuid& uuid) {
+    // Verifiy that the generated password is correct
+    u32 password = 0xAA ^ (uuid[1] ^ uuid[3]);
+    password &= (0x55 ^ (uuid[2] ^ uuid[4])) << 8;
+    password &= (0xAA ^ (uuid[3] ^ uuid[5])) << 16;
+    password &= (0x55 ^ (uuid[4] ^ uuid[6])) << 24;
+    return password;
+}
+
+HashSeed GetSeed(const NTAG215File& data) {
+    HashSeed seed{
+        .data =
+            {
+                .magic = data.write_counter,
+                .padding = {},
+                .uuid1 = {},
+                .uuid2 = {},
+                .keygen_salt = data.keygen_salt,
+            },
+    };
+
+    // Copy the first 8 bytes of uuid
+    memcpy(seed.data.uuid1.data(), data.uuid.data(), sizeof(seed.data.uuid1));
+    memcpy(seed.data.uuid2.data(), data.uuid.data(), sizeof(seed.data.uuid2));
+
+    return seed;
+}
+
+void PreGenerateKey(const InternalKey& key, const HashSeed& seed, u8* output,
+                    std::size_t& outputLen) {
+    std::size_t index = 0;
+
+    // Copy whole type string
+    memccpy(output + index, key.type_string.data(), '\0', key.type_string.size());
+    index += key.type_string.size();
+
+    // Append (16 - magic_length) from the input seed
+    std::size_t seedPart1Len = 16 - key.magic_length;
+    memcpy(output + index, &seed, seedPart1Len);
+    index += seedPart1Len;
+
+    // Append all bytes from magicBytes
+    memcpy(output + index, &key.magic_bytes, key.magic_length);
+    index += key.magic_length;
+
+    // Seed 16 bytes at +0x10
+    memcpy(output + index, &seed.raw[0x10], 16);
+    index += 16;
+
+    // 32 bytes at +0x20 from input seed xored with xor pad
+    for (std::size_t i = 0; i < 32; i++)
+        output[index + i] = seed.raw[i + 32] ^ key.xor_pad[i];
+    index += 32;
+
+    outputLen = index;
+}
+
+void CryptoInit(CryptoCtx& ctx, mbedtls_md_context_t& hmac_ctx, const HmacKey& hmac_key,
+                const u8* seed, std::size_t seed_size) {
+
+    // Initialize context
+    ctx.used = false;
+    ctx.counter = 0;
+    ctx.buffer_size = sizeof(ctx.counter) + seed_size;
+    memcpy(ctx.buffer.data() + sizeof(u16), seed, seed_size);
+
+    // Initialize HMAC context
+    mbedtls_md_init(&hmac_ctx);
+    mbedtls_md_setup(&hmac_ctx, mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), 1);
+    mbedtls_md_hmac_starts(&hmac_ctx, hmac_key.data(), hmac_key.size());
+}
+
+void CryptoStep(CryptoCtx& ctx, mbedtls_md_context_t& hmac_ctx, DrgbOutput& output) {
+    // If used at least once, reinitialize the HMAC
+    if (ctx.used) {
+        mbedtls_md_hmac_reset(&hmac_ctx);
+    }
+
+    ctx.used = true;
+
+    // Store counter in big endian, and increment it
+    ctx.buffer[0] = static_cast<u8>(ctx.counter >> 8);
+    ctx.buffer[1] = static_cast<u8>(ctx.counter >> 0);
+    ctx.counter++;
+
+    // Do HMAC magic
+    mbedtls_md_hmac_update(&hmac_ctx, reinterpret_cast<const unsigned char*>(ctx.buffer.data()),
+                           ctx.buffer_size);
+    mbedtls_md_hmac_finish(&hmac_ctx, output.data());
+}
+
+DerivedKeys GenerateKey(const InternalKey& key, const NTAG215File& data) {
+    constexpr std::size_t OUTPUT_SIZE = 512;
+    const auto seed = GetSeed(data);
+
+    // Generate internal seed
+    u8 internal_key[OUTPUT_SIZE];
+    std::size_t internal_key_lenght = 0;
+    PreGenerateKey(key, seed, internal_key, internal_key_lenght);
+
+    // Initialize context
+    CryptoCtx ctx{};
+    mbedtls_md_context_t hmac_ctx;
+    CryptoInit(ctx, hmac_ctx, key.hmac_key, internal_key, internal_key_lenght);
+
+    // Generate derived keys
+    DerivedKeys derived_keys{};
+    std::array<DrgbOutput, 2> temp{};
+    CryptoStep(ctx, hmac_ctx, temp[0]);
+    CryptoStep(ctx, hmac_ctx, temp[1]);
+    memcpy(&derived_keys, temp.data(), sizeof(DerivedKeys));
+
+    // Cleanup context
+    mbedtls_md_free(&hmac_ctx);
+
+    return derived_keys;
+}
+
+void Cipher(const DerivedKeys& keys, const NTAG215File& in_data, NTAG215File& out_data) {
+    mbedtls_aes_context aes;
+    std::size_t nc_off = 0;
+    std::array<u8, 0x10> nonce_counter{};
+    std::array<u8, 0x10> stream_block{};
+
+    mbedtls_aes_setkey_enc(&aes, keys.aes_key.data(), 128);
+    memcpy(nonce_counter.data(), keys.aes_iv.data(), sizeof(nonce_counter));
+
+    std::array<u8, sizeof(NTAG215File)> in_data_byes{};
+    std::array<u8, sizeof(NTAG215File)> out_data_bytes{};
+    memcpy(in_data_byes.data(), &in_data, sizeof(NTAG215File));
+    memcpy(out_data_bytes.data(), &out_data, sizeof(NTAG215File));
+
+    mbedtls_aes_crypt_ctr(&aes, 0x188, &nc_off, nonce_counter.data(), stream_block.data(),
+                          in_data_byes.data() + 0x2c, out_data_bytes.data() + 0x2c);
+
+    memcpy(out_data_bytes.data(), in_data_byes.data(), 0x008);
+    // Data signature NOT copied
+    memcpy(out_data_bytes.data() + 0x028, in_data_byes.data() + 0x028, 0x004);
+    // Tag signature NOT copied
+    memcpy(out_data_bytes.data() + 0x1D4, in_data_byes.data() + 0x1D4, 0x048);
+
+    memcpy(&out_data, out_data_bytes.data(), sizeof(NTAG215File));
+}
+
+bool LoadKeys(InternalKey& locked_secret, InternalKey& unfixed_info) {
+    const auto yuzu_keys_dir = Common::FS::GetYuzuPath(Common::FS::YuzuPath::KeysDir);
+
+    const Common::FS::IOFile keys_file{yuzu_keys_dir / "key_retail.bin",
+                                       Common::FS::FileAccessMode::Read,
+                                       Common::FS::FileType::BinaryFile};
+
+    if (!keys_file.IsOpen()) {
+        LOG_ERROR(Core, "No keys detected");
+        return false;
+    }
+
+    if (keys_file.Read(unfixed_info) != 1) {
+        LOG_ERROR(Core, "Failed to read unfixed_info");
+        return false;
+    }
+    if (keys_file.Read(locked_secret) != 1) {
+        LOG_ERROR(Core, "Failed to read locked-secret");
+        return false;
+    }
+
+    return true;
+}
+
+bool DecodeAmiibo(const EncryptedNTAG215File& encrypted_tag_data, NTAG215File& tag_data) {
+    InternalKey locked_secret{};
+    InternalKey unfixed_info{};
+
+    if (!LoadKeys(locked_secret, unfixed_info)) {
+        return false;
+    }
+
+    // Generate keys
+    NTAG215File encoded_data = NfcDataToEncodedData(encrypted_tag_data);
+    const auto data_keys = GenerateKey(unfixed_info, encoded_data);
+    const auto tag_keys = GenerateKey(locked_secret, encoded_data);
+
+    // Decrypt
+    Cipher(data_keys, encoded_data, tag_data);
+
+    std::array<u8, sizeof(NTAG215File)> out{};
+    memcpy(out.data(), &tag_data, sizeof(NTAG215File));
+
+    // Regenerate tag HMAC. Note: order matters, data HMAC depends on tag HMAC!
+    mbedtls_md_hmac(mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), tag_keys.hmac_key.data(),
+                    sizeof(HmacKey), out.data() + 0x1D4, 0x34, out.data() + HMAC_POS_TAG);
+
+    // Regenerate data HMAC
+    mbedtls_md_hmac(mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), data_keys.hmac_key.data(),
+                    sizeof(HmacKey), out.data() + 0x29, 0x1DF, out.data() + HMAC_POS_DATA);
+
+    memcpy(&tag_data, out.data(), sizeof(NTAG215File));
+
+    if (memcmp(tag_data.unfixed_hash.data(), encrypted_tag_data.user_memory.unfixed_hash.data(),
+               32) != 0) {
+        return false;
+    }
+
+    if (memcmp(tag_data.locked_hash.data(), encrypted_tag_data.user_memory.locked_hash.data(),
+               32) != 0) {
+        return false;
+    }
+
+    return true;
+}
+
+bool EncodeAmiibo(const NTAG215File& tag_data, EncryptedNTAG215File& encrypted_tag_data) {
+    InternalKey locked_secret{};
+    InternalKey unfixed_info{};
+
+    if (!LoadKeys(locked_secret, unfixed_info)) {
+        return false;
+    }
+
+    // Generate keys
+    const auto data_keys = GenerateKey(unfixed_info, tag_data);
+    const auto tag_keys = GenerateKey(locked_secret, tag_data);
+
+    std::array<u8, sizeof(NTAG215File)> plain{};
+    std::array<u8, sizeof(NTAG215File)> cipher{};
+    memcpy(plain.data(), &tag_data, sizeof(NTAG215File));
+
+    // Generate tag HMAC
+    mbedtls_md_hmac(mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), tag_keys.hmac_key.data(),
+                    sizeof(HmacKey), plain.data() + 0x1D4, 0x34, cipher.data() + HMAC_POS_TAG);
+
+    // Init mbedtls HMAC context
+    mbedtls_md_context_t ctx;
+    mbedtls_md_init(&ctx);
+    mbedtls_md_setup(&ctx, mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), 1);
+
+    // Generate data HMAC
+    mbedtls_md_hmac_starts(&ctx, data_keys.hmac_key.data(), sizeof(HmacKey));
+    mbedtls_md_hmac_update(&ctx, plain.data() + 0x029, 0x18B);        // Data
+    mbedtls_md_hmac_update(&ctx, cipher.data() + HMAC_POS_TAG, 0x20); // Tag HMAC
+    mbedtls_md_hmac_update(&ctx, plain.data() + 0x1D4, 0x34);
+    mbedtls_md_hmac_finish(&ctx, cipher.data() + HMAC_POS_DATA);
+
+    // HMAC cleanup
+    mbedtls_md_free(&ctx);
+
+    // Encrypt
+    NTAG215File encoded_tag_data{};
+    memcpy(&encoded_tag_data, cipher.data(), sizeof(NTAG215File));
+    Cipher(data_keys, tag_data, encoded_tag_data);
+
+    // Convert back to hardware
+    encrypted_tag_data = EncodedDataToNfcData(encoded_tag_data);
+
+    return true;
+}
+
+} // namespace Service::NFP::AmiiboCrypto

src/core/hle/service/nfp/amiibo_crypto.h

@@ -0,0 +1,102 @@
+// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <array>
+
+#include "core/hle/service/nfp/amiibo_types.h"
+
+struct mbedtls_md_context_t;
+
+namespace Service::NFP::AmiiboCrypto {
+constexpr std::size_t HMAC_POS_DATA = 0x8;
+constexpr std::size_t HMAC_POS_TAG = 0x1B4;
+
+using HmacKey = std::array<u8, 0x10>;
+using DrgbOutput = std::array<u8, 0x20>;
+
+struct HashSeed {
+    union {
+        std::array<u8, 0x40> raw;
+        struct {
+            u16 magic;
+            std::array<u8, 0xE> padding;
+            std::array<u8, 0x8> uuid1;
+            std::array<u8, 0x8> uuid2;
+            std::array<u8, 0x20> keygen_salt;
+        } data;
+    };
+};
+static_assert(sizeof(HashSeed) == 0x40, "HashSeed is an invalid size");
+
+struct InternalKey {
+    HmacKey hmac_key;
+    std::array<char, 0xE> type_string;
+    u8 reserved;
+    u8 magic_length;
+    std::array<u8, 0x10> magic_bytes;
+    std::array<u8, 0x20> xor_pad;
+};
+static_assert(sizeof(InternalKey) == 0x50, "InternalKey is an invalid size");
+static_assert(std::is_trivially_copyable_v<InternalKey>, "InternalKey must be trivially copyable.");
+
+struct CryptoCtx {
+    std::array<char, 480> buffer;
+    bool used;
+    std::size_t buffer_size;
+    s16 counter;
+};
+
+struct DerivedKeys {
+    std::array<u8, 0x10> aes_key;
+    std::array<u8, 0x10> aes_iv;
+    std::array<u8, 0x10> hmac_key;
+};
+static_assert(sizeof(DerivedKeys) == 0x30, "DerivedKeys is an invalid size");
+
+/// Converts mii data from nintendo 3ds format to nintendo switch format
+Service::Mii::MiiInfo AmiiboRegisterInfoToMii(const AmiiboRegisterInfo& register_info);
+
+/// Validates that the amiibo file is not corrupted
+bool IsAmiiboValid(const EncryptedNTAG215File& ntag_file);
+
+/// Converts from encrypted file format to encoded file format
+NTAG215File NfcDataToEncodedData(const EncryptedNTAG215File& nfc_data);
+
+/// Converts from encoded file format to encrypted file format
+EncryptedNTAG215File EncodedDataToNfcData(const NTAG215File& encoded_data);
+
+/// Returns password needed to allow write access to protected memory
+u32 GetTagPassword(const TagUuid& uuid);
+
+// Generates Seed needed for key derivation
+HashSeed GetSeed(const NTAG215File& data);
+
+// Middle step on the generation of derived keys
+void PreGenerateKey(const InternalKey& key, const HashSeed& seed, u8* output,
+                    std::size_t& outputLen);
+
+// Initializes mbedtls context
+void CryptoInit(CryptoCtx& ctx, mbedtls_md_context_t& hmac_ctx, const HmacKey& hmac_key,
+                const u8* seed, std::size_t seed_size);
+
+// Feeds data to mbedtls context to generate the derived key
+void CryptoStep(CryptoCtx& ctx, mbedtls_md_context_t& hmac_ctx, DrgbOutput& output);
+
+// Generates the derived key from amiibo data
+DerivedKeys GenerateKey(const InternalKey& key, const NTAG215File& data);
+
+// Encodes or decodes amiibo data
+void Cipher(const DerivedKeys& keys, const NTAG215File& in_data, NTAG215File& out_data);
+
+/// Loads both amiibo keys from key_retail.bin
+bool LoadKeys(InternalKey& locked_secret, InternalKey& unfixed_info);
+
+/// Decodes encripted amiibo data returns true if output is valid
+bool DecodeAmiibo(const EncryptedNTAG215File& encrypted_tag_data, NTAG215File& tag_data);
+
+/// Encodes plain amiibo data returns true if output is valid
+bool EncodeAmiibo(const NTAG215File& tag_data, EncryptedNTAG215File& encrypted_tag_data);
+
+} // namespace Service::NFP::AmiiboCrypto

src/core/hle/service/nfp/amiibo_types.h

@@ -0,0 +1,304 @@
+// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <array>
+
+namespace Service::NFP {
+enum class ServiceType : u32 {
+    User,
+    Debug,
+    System,
+};
+
+enum class State : u32 {
+    NonInitialized,
+    Initialized,
+};
+
+enum class DeviceState : u32 {
+    Initialized,
+    SearchingForTag,
+    TagFound,
+    TagRemoved,
+    TagMounted,
+    Unaviable,
+    Finalized,
+};
+
+enum class ModelType : u32 {
+    Amiibo,
+};
+
+enum class MountTarget : u32 {
+    Rom,
+    Ram,
+    All,
+};
+
+enum class AmiiboType : u8 {
+    Figure,
+    Card,
+    Yarn,
+};
+
+enum class AmiiboSeries : u8 {
+    SuperSmashBros,
+    SuperMario,
+    ChibiRobo,
+    YoshiWoollyWorld,
+    Splatoon,
+    AnimalCrossing,
+    EightBitMario,
+    Skylanders,
+    Unknown8,
+    TheLegendOfZelda,
+    ShovelKnight,
+    Unknown11,
+    Kiby,
+    Pokemon,
+    MarioSportsSuperstars,
+    MonsterHunter,
+    BoxBoy,
+    Pikmin,
+    FireEmblem,
+    Metroid,
+    Others,
+    MegaMan,
+    Diablo,
+};
+
+using TagUuid = std::array<u8, 10>;
+using HashData = std::array<u8, 0x20>;
+using ApplicationArea = std::array<u8, 0xD8>;
+
+struct AmiiboDate {
+    union {
+        u16_be raw{};
+
+        BitField<0, 5, u16> day;
+        BitField<5, 4, u16> month;
+        BitField<9, 7, u16> year;
+    };
+};
+static_assert(sizeof(AmiiboDate) == 2, "AmiiboDate is an invalid size");
+
+struct Settings {
+    union {
+        u8 raw{};
+
+        BitField<4, 1, u8> amiibo_initialized;
+        BitField<5, 1, u8> appdata_initialized;
+    };
+};
+static_assert(sizeof(Settings) == 1, "AmiiboDate is an invalid size");
+
+struct AmiiboSettings {
+    Settings settings;
+    u8 country_code_id;
+    u16_be crc_counter; // Incremented each time crc is changed
+    AmiiboDate init_date;
+    AmiiboDate write_date;
+    u32_be crc;
+    std::array<u16_be, 0xA> amiibo_name; // UTF-16 text
+};
+static_assert(sizeof(AmiiboSettings) == 0x20, "AmiiboSettings is an invalid size");
+
+struct AmiiboModelInfo {
+    u16 character_id;
+    u8 character_variant;
+    AmiiboType amiibo_type;
+    u16 model_number;
+    AmiiboSeries series;
+    u8 constant_value;         // Must be 02
+    INSERT_PADDING_BYTES(0x4); // Unknown
+};
+static_assert(sizeof(AmiiboModelInfo) == 0xC, "AmiiboModelInfo is an invalid size");
+
+struct NTAG215Password {
+    u32 PWD;  // Password to allow write access
+    u16 PACK; // Password acknowledge reply
+    u16 RFUI; // Reserved for future use
+};
+static_assert(sizeof(NTAG215Password) == 0x8, "NTAG215Password is an invalid size");
+
+// Based on citra HLE::Applets::MiiData and PretendoNetwork.
+// https://github.com/citra-emu/citra/blob/master/src/core/hle/applets/mii_selector.h#L48
+// https://github.com/PretendoNetwork/mii-js/blob/master/mii.js#L299
+#pragma pack(1)
+struct AmiiboRegisterInfo {
+    u32_be mii_id;
+    u64_be system_id;
+    u32_be specialness_and_creation_date;
+    std::array<u8, 0x6> creator_mac;
+    u16_be padding;
+    union {
+        u16 raw;
+
+        BitField<0, 1, u16> gender;
+        BitField<1, 4, u16> birth_month;
+        BitField<5, 5, u16> birth_day;
+        BitField<10, 4, u16> favorite_color;
+        BitField<14, 1, u16> favorite;
+    } mii_information;
+    std::array<char16_t, 0xA> mii_name;
+    u8 height;
+    u8 build;
+    union {
+        u8 raw;
+
+        BitField<0, 1, u8> disable_sharing;
+        BitField<1, 4, u8> face_shape;
+        BitField<5, 3, u8> skin_color;
+    } appearance_bits1;
+    union {
+        u8 raw;
+
+        BitField<0, 4, u8> wrinkles;
+        BitField<4, 4, u8> makeup;
+    } appearance_bits2;
+    u8 hair_style;
+    union {
+        u8 raw;
+
+        BitField<0, 3, u8> hair_color;
+        BitField<3, 1, u8> flip_hair;
+    } appearance_bits3;
+    union {
+        u32 raw;
+
+        BitField<0, 6, u32> eye_type;
+        BitField<6, 3, u32> eye_color;
+        BitField<9, 4, u32> eye_scale;
+        BitField<13, 3, u32> eye_vertical_stretch;
+        BitField<16, 5, u32> eye_rotation;
+        BitField<21, 4, u32> eye_spacing;
+        BitField<25, 5, u32> eye_y_position;
+    } appearance_bits4;
+    union {
+        u32 raw;
+
+        BitField<0, 5, u32> eyebrow_style;
+        BitField<5, 3, u32> eyebrow_color;
+        BitField<8, 4, u32> eyebrow_scale;
+        BitField<12, 3, u32> eyebrow_yscale;
+        BitField<16, 4, u32> eyebrow_rotation;
+        BitField<21, 4, u32> eyebrow_spacing;
+        BitField<25, 5, u32> eyebrow_y_position;
+    } appearance_bits5;
+    union {
+        u16 raw;
+
+        BitField<0, 5, u16> nose_type;
+        BitField<5, 4, u16> nose_scale;
+        BitField<9, 5, u16> nose_y_position;
+    } appearance_bits6;
+    union {
+        u16 raw;
+
+        BitField<0, 6, u16> mouth_type;
+        BitField<6, 3, u16> mouth_color;
+        BitField<9, 4, u16> mouth_scale;
+        BitField<13, 3, u16> mouth_horizontal_stretch;
+    } appearance_bits7;
+    union {
+        u8 raw;
+
+        BitField<0, 5, u8> mouth_y_position;
+        BitField<5, 3, u8> mustache_type;
+    } appearance_bits8;
+    u8 allow_copying;
+    union {
+        u16 raw;
+
+        BitField<0, 3, u16> bear_type;
+        BitField<3, 3, u16> facial_hair_color;
+        BitField<6, 4, u16> mustache_scale;
+        BitField<10, 5, u16> mustache_y_position;
+    } appearance_bits9;
+    union {
+        u16 raw;
+
+        BitField<0, 4, u16> glasses_type;
+        BitField<4, 3, u16> glasses_color;
+        BitField<7, 4, u16> glasses_scale;
+        BitField<11, 5, u16> glasses_y_position;
+    } appearance_bits10;
+    union {
+        u16 raw;
+
+        BitField<0, 1, u16> mole_enabled;
+        BitField<1, 4, u16> mole_scale;
+        BitField<5, 5, u16> mole_x_position;
+        BitField<10, 5, u16> mole_y_position;
+    } appearance_bits11;
+
+    std::array<u16_le, 0xA> author_name;
+    INSERT_PADDING_BYTES(0x4);
+};
+static_assert(sizeof(AmiiboRegisterInfo) == 0x60, "AmiiboRegisterInfo is an invalid size");
+
+struct EncryptedAmiiboFile {
+    u8 constant_value;               // Must be A5
+    u16 write_counter;               // Number of times the amiibo has been written?
+    INSERT_PADDING_BYTES(0x1);       // Unknown 1
+    AmiiboSettings settings;         // Encrypted amiibo settings
+    HashData locked_hash;            // Hash
+    AmiiboModelInfo model_info;      // Encrypted amiibo model info
+    HashData keygen_salt;            // Salt
+    HashData unfixed_hash;           // Hash
+    AmiiboRegisterInfo owner_mii;    // Encrypted Mii data
+    u64_be title_id;                 // Encrypted Game id
+    u16_be applicaton_write_counter; // Encrypted Counter
+    u32_be application_area_id;      // Encrypted Game id
+    std::array<u8, 0x2> unknown;
+    HashData hash;                    // Probably a SHA256-HMAC hash?
+    ApplicationArea application_area; // Encrypted Game data
+};
+static_assert(sizeof(EncryptedAmiiboFile) == 0x1F8, "AmiiboFile is an invalid size");
+
+struct NTAG215File {
+    std::array<u8, 0x2> uuid2;
+    u16 static_lock;           // Set defined pages as read only
+    u32 compability_container; // Defines available memory
+    HashData unfixed_hash;     // Hash
+    u8 constant_value;         // Must be A5
+    u16 write_counter;         // Number of times the amiibo has been written?
+    INSERT_PADDING_BYTES(0x1); // Unknown 1
+    AmiiboSettings settings;
+    AmiiboRegisterInfo owner_mii; // Encrypted Mii data
+    u64_be title_id;
+    u16_be applicaton_write_counter; // Encrypted Counter
+    u32_be application_area_id;
+    std::array<u8, 0x2> unknown;
+    HashData hash;                    // Probably a SHA256-HMAC hash?
+    ApplicationArea application_area; // Encrypted Game data
+    HashData locked_hash;             // Hash
+    std::array<u8, 0x8> uuid;
+    AmiiboModelInfo model_info;
+    HashData keygen_salt;     // Salt
+    u32 dynamic_lock;         // Dynamic lock
+    u32 CFG0;                 // Defines memory protected by password
+    u32 CFG1;                 // Defines number of verification attempts
+    NTAG215Password password; // Password data
+};
+static_assert(sizeof(NTAG215File) == 0x21C, "NTAG215File is an invalid size");
+static_assert(std::is_trivially_copyable_v<NTAG215File>, "NTAG215File must be trivially copyable.");
+#pragma pack()
+
+struct EncryptedNTAG215File {
+    TagUuid uuid;                    // Unique serial number
+    u16 static_lock;                 // Set defined pages as read only
+    u32 compability_container;       // Defines available memory
+    EncryptedAmiiboFile user_memory; // Writable data
+    u32 dynamic_lock;                // Dynamic lock
+    u32 CFG0;                        // Defines memory protected by password
+    u32 CFG1;                        // Defines number of verification attempts
+    NTAG215Password password;        // Password data
+};
+static_assert(sizeof(EncryptedNTAG215File) == 0x21C, "EncryptedNTAG215File is an invalid size");
+static_assert(std::is_trivially_copyable_v<EncryptedNTAG215File>,
+              "EncryptedNTAG215File must be trivially copyable.");
+
+} // namespace Service::NFP

src/core/hle/service/nfp/nfp.cpp

@@ -4,6 +4,8 @@
 #include <array>
 #include <atomic>
 
+#include "common/fs/file.h"
+#include "common/fs/path_util.h"
 #include "common/logging/log.h"
 #include "core/core.h"
 #include "core/hid/emulated_controller.h"
@@ -12,6 +14,7 @@
 #include "core/hle/ipc_helpers.h"
 #include "core/hle/kernel/k_event.h"
 #include "core/hle/service/mii/mii_manager.h"
+#include "core/hle/service/nfp/amiibo_crypto.h"
 #include "core/hle/service/nfp/nfp.h"
 #include "core/hle/service/nfp/nfp_user.h"
 
@@ -19,12 +22,13 @@ namespace Service::NFP {
 namespace ErrCodes {
 constexpr Result DeviceNotFound(ErrorModule::NFP, 64);
 constexpr Result WrongDeviceState(ErrorModule::NFP, 73);
+constexpr Result NfcDisabled(ErrorModule::NFP, 80);
+constexpr Result WriteAmiiboFailed(ErrorModule::NFP, 88);
 constexpr Result ApplicationAreaIsNotInitialized(ErrorModule::NFP, 128);
+constexpr Result WrongApplicationAreaId(ErrorModule::NFP, 152);
 constexpr Result ApplicationAreaExist(ErrorModule::NFP, 168);
 } // namespace ErrCodes
 
-constexpr u32 ApplicationAreaSize = 0xD8;
-
 IUser::IUser(Module::Interface& nfp_interface_, Core::System& system_)
     : ServiceFramework{system_, "NFP::IUser"}, service_context{system_, service_name},
       nfp_interface{nfp_interface_} {
@@ -39,7 +43,7 @@ IUser::IUser(Module::Interface& nfp_interface_, Core::System& system_)
         {7, &IUser::OpenApplicationArea, "OpenApplicationArea"},
         {8, &IUser::GetApplicationArea, "GetApplicationArea"},
         {9, &IUser::SetApplicationArea, "SetApplicationArea"},
-        {10, nullptr, "Flush"},
+        {10, &IUser::Flush, "Flush"},
         {11, nullptr, "Restore"},
         {12, &IUser::CreateApplicationArea, "CreateApplicationArea"},
         {13, &IUser::GetTagInfo, "GetTagInfo"},
@@ -87,11 +91,23 @@ void IUser::Finalize(Kernel::HLERequestContext& ctx) {
 void IUser::ListDevices(Kernel::HLERequestContext& ctx) {
     LOG_INFO(Service_NFP, "called");
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     std::vector<u64> devices;
 
     // TODO(german77): Loop through all interfaces
     devices.push_back(nfp_interface.GetHandle());
 
+    if (devices.size() == 0) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::DeviceNotFound);
+        return;
+    }
+
     ctx.WriteBuffer(devices);
 
     IPC::ResponseBuilder rb{ctx, 3};
@@ -105,6 +121,12 @@ void IUser::StartDetection(Kernel::HLERequestContext& ctx) {
     const auto nfp_protocol{rp.Pop<s32>()};
     LOG_INFO(Service_NFP, "called, device_handle={}, nfp_protocol={}", device_handle, nfp_protocol);
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     // TODO(german77): Loop through all interfaces
     if (device_handle == nfp_interface.GetHandle()) {
         const auto result = nfp_interface.StartDetection(nfp_protocol);
@@ -124,6 +146,12 @@ void IUser::StopDetection(Kernel::HLERequestContext& ctx) {
     const auto device_handle{rp.Pop<u64>()};
     LOG_INFO(Service_NFP, "called, device_handle={}", device_handle);
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     // TODO(german77): Loop through all interfaces
     if (device_handle == nfp_interface.GetHandle()) {
         const auto result = nfp_interface.StopDetection();
@@ -146,6 +174,12 @@ void IUser::Mount(Kernel::HLERequestContext& ctx) {
     LOG_INFO(Service_NFP, "called, device_handle={}, model_type={}, mount_target={}", device_handle,
              model_type, mount_target);
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     // TODO(german77): Loop through all interfaces
     if (device_handle == nfp_interface.GetHandle()) {
         const auto result = nfp_interface.Mount();
@@ -165,6 +199,12 @@ void IUser::Unmount(Kernel::HLERequestContext& ctx) {
     const auto device_handle{rp.Pop<u64>()};
     LOG_INFO(Service_NFP, "called, device_handle={}", device_handle);
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     // TODO(german77): Loop through all interfaces
     if (device_handle == nfp_interface.GetHandle()) {
         const auto result = nfp_interface.Unmount();
@@ -186,6 +226,12 @@ void IUser::OpenApplicationArea(Kernel::HLERequestContext& ctx) {
     LOG_WARNING(Service_NFP, "(STUBBED) called, device_handle={}, access_id={}", device_handle,
                 access_id);
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     // TODO(german77): Loop through all interfaces
     if (device_handle == nfp_interface.GetHandle()) {
         const auto result = nfp_interface.OpenApplicationArea(access_id);
@@ -205,9 +251,15 @@ void IUser::GetApplicationArea(Kernel::HLERequestContext& ctx) {
     const auto device_handle{rp.Pop<u64>()};
     LOG_INFO(Service_NFP, "called, device_handle={}", device_handle);
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     // TODO(german77): Loop through all interfaces
     if (device_handle == nfp_interface.GetHandle()) {
-        std::vector<u8> data{};
+        ApplicationArea data{};
         const auto result = nfp_interface.GetApplicationArea(data);
         ctx.WriteBuffer(data);
         IPC::ResponseBuilder rb{ctx, 3};
@@ -229,6 +281,12 @@ void IUser::SetApplicationArea(Kernel::HLERequestContext& ctx) {
     LOG_WARNING(Service_NFP, "(STUBBED) called, device_handle={}, data_size={}", device_handle,
                 data.size());
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     // TODO(german77): Loop through all interfaces
     if (device_handle == nfp_interface.GetHandle()) {
         const auto result = nfp_interface.SetApplicationArea(data);
@@ -243,6 +301,31 @@ void IUser::SetApplicationArea(Kernel::HLERequestContext& ctx) {
     rb.Push(ErrCodes::DeviceNotFound);
 }
 
+void IUser::Flush(Kernel::HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+    const auto device_handle{rp.Pop<u64>()};
+    LOG_WARNING(Service_NFP, "(STUBBED) called, device_handle={}", device_handle);
+
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
+    // TODO(german77): Loop through all interfaces
+    if (device_handle == nfp_interface.GetHandle()) {
+        const auto result = nfp_interface.Flush();
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(result);
+        return;
+    }
+
+    LOG_ERROR(Service_NFP, "Handle not found, device_handle={}", device_handle);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(ErrCodes::DeviceNotFound);
+}
+
 void IUser::CreateApplicationArea(Kernel::HLERequestContext& ctx) {
     IPC::RequestParser rp{ctx};
     const auto device_handle{rp.Pop<u64>()};
@@ -251,6 +334,12 @@ void IUser::CreateApplicationArea(Kernel::HLERequestContext& ctx) {
     LOG_WARNING(Service_NFP, "(STUBBED) called, device_handle={}, data_size={}, access_id={}",
                 device_handle, access_id, data.size());
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     // TODO(german77): Loop through all interfaces
     if (device_handle == nfp_interface.GetHandle()) {
         const auto result = nfp_interface.CreateApplicationArea(access_id, data);
@@ -270,6 +359,12 @@ void IUser::GetTagInfo(Kernel::HLERequestContext& ctx) {
     const auto device_handle{rp.Pop<u64>()};
     LOG_INFO(Service_NFP, "called, device_handle={}", device_handle);
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     // TODO(german77): Loop through all interfaces
     if (device_handle == nfp_interface.GetHandle()) {
         TagInfo tag_info{};
@@ -291,6 +386,12 @@ void IUser::GetRegisterInfo(Kernel::HLERequestContext& ctx) {
     const auto device_handle{rp.Pop<u64>()};
     LOG_INFO(Service_NFP, "called, device_handle={}", device_handle);
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     // TODO(german77): Loop through all interfaces
     if (device_handle == nfp_interface.GetHandle()) {
         RegisterInfo register_info{};
@@ -312,6 +413,12 @@ void IUser::GetCommonInfo(Kernel::HLERequestContext& ctx) {
     const auto device_handle{rp.Pop<u64>()};
     LOG_INFO(Service_NFP, "called, device_handle={}", device_handle);
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     // TODO(german77): Loop through all interfaces
     if (device_handle == nfp_interface.GetHandle()) {
         CommonInfo common_info{};
@@ -333,6 +440,12 @@ void IUser::GetModelInfo(Kernel::HLERequestContext& ctx) {
     const auto device_handle{rp.Pop<u64>()};
     LOG_INFO(Service_NFP, "called, device_handle={}", device_handle);
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     // TODO(german77): Loop through all interfaces
     if (device_handle == nfp_interface.GetHandle()) {
         ModelInfo model_info{};
@@ -354,6 +467,12 @@ void IUser::AttachActivateEvent(Kernel::HLERequestContext& ctx) {
     const auto device_handle{rp.Pop<u64>()};
     LOG_DEBUG(Service_NFP, "called, device_handle={}", device_handle);
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     // TODO(german77): Loop through all interfaces
     if (device_handle == nfp_interface.GetHandle()) {
         IPC::ResponseBuilder rb{ctx, 2, 1};
@@ -373,6 +492,12 @@ void IUser::AttachDeactivateEvent(Kernel::HLERequestContext& ctx) {
     const auto device_handle{rp.Pop<u64>()};
     LOG_DEBUG(Service_NFP, "called, device_handle={}", device_handle);
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     // TODO(german77): Loop through all interfaces
     if (device_handle == nfp_interface.GetHandle()) {
         IPC::ResponseBuilder rb{ctx, 2, 1};
@@ -419,6 +544,12 @@ void IUser::GetNpadId(Kernel::HLERequestContext& ctx) {
     const auto device_handle{rp.Pop<u64>()};
     LOG_DEBUG(Service_NFP, "called, device_handle={}", device_handle);
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     // TODO(german77): Loop through all interfaces
     if (device_handle == nfp_interface.GetHandle()) {
         IPC::ResponseBuilder rb{ctx, 3};
@@ -442,7 +573,7 @@ void IUser::GetApplicationAreaSize(Kernel::HLERequestContext& ctx) {
     if (device_handle == nfp_interface.GetHandle()) {
         IPC::ResponseBuilder rb{ctx, 3};
         rb.Push(ResultSuccess);
-        rb.Push(ApplicationAreaSize);
+        rb.Push(sizeof(ApplicationArea));
         return;
     }
 
@@ -455,6 +586,12 @@ void IUser::GetApplicationAreaSize(Kernel::HLERequestContext& ctx) {
 void IUser::AttachAvailabilityChangeEvent(Kernel::HLERequestContext& ctx) {
     LOG_DEBUG(Service_NFP, "(STUBBED) called");
 
+    if (state == State::NonInitialized) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ErrCodes::NfcDisabled);
+        return;
+    }
+
     IPC::ResponseBuilder rb{ctx, 2, 1};
     rb.Push(ResultSuccess);
     rb.PushCopyObjects(availability_change_event->GetReadableEvent());
@@ -478,37 +615,43 @@ void Module::Interface::CreateUserInterface(Kernel::HLERequestContext& ctx) {
     rb.PushIpcInterface<IUser>(*this, system);
 }
 
-bool Module::Interface::LoadAmiibo(const std::vector<u8>& buffer) {
+bool Module::Interface::LoadAmiiboFile(const std::string& filename) {
+    constexpr auto tag_size_without_password = sizeof(NTAG215File) - sizeof(NTAG215Password);
+    const Common::FS::IOFile amiibo_file{filename, Common::FS::FileAccessMode::Read,
+                                         Common::FS::FileType::BinaryFile};
+
+    if (!amiibo_file.IsOpen()) {
+        LOG_ERROR(Core, "Amiibo is already on use");
+        return false;
+    }
+
+    // Workaround for files with missing password data
+    std::array<u8, sizeof(EncryptedNTAG215File)> buffer{};
+    if (amiibo_file.Read(buffer) < tag_size_without_password) {
+        LOG_ERROR(Core, "Failed to read amiibo file");
+        return false;
+    }
+    memcpy(&encrypted_tag_data, buffer.data(), sizeof(EncryptedNTAG215File));
+
+    if (!AmiiboCrypto::IsAmiiboValid(encrypted_tag_data)) {
+        LOG_INFO(Service_NFP, "Invalid amiibo");
+        return false;
+    }
+
+    file_path = filename;
+    return true;
+}
+
+bool Module::Interface::LoadAmiibo(const std::string& filename) {
     if (device_state != DeviceState::SearchingForTag) {
         LOG_ERROR(Service_NFP, "Game is not looking for amiibos, current state {}", device_state);
         return false;
     }
 
-    constexpr auto tag_size = sizeof(NTAG215File);
+    if (!LoadAmiiboFile(filename)) {
-    constexpr auto tag_size_without_password = sizeof(NTAG215File) - sizeof(NTAG215Password);
-
-    std::vector<u8> amiibo_buffer = buffer;
-
-    if (amiibo_buffer.size() < tag_size_without_password) {
-        LOG_ERROR(Service_NFP, "Wrong file size {}", buffer.size());
         return false;
     }
 
-    // Ensure it has the correct size
-    if (amiibo_buffer.size() != tag_size) {
-        amiibo_buffer.resize(tag_size, 0);
-    }
-
-    LOG_INFO(Service_NFP, "Amiibo detected");
-    std::memcpy(&tag_data, buffer.data(), tag_size);
-
-    if (!IsAmiiboValid()) {
-        return false;
-    }
-
-    // This value can't be dumped from a tag. Generate it
-    tag_data.password.PWD = GetTagPassword(tag_data.uuid);
-
     device_state = DeviceState::TagFound;
     activate_event->GetWritableEvent().Signal();
     return true;
@@ -517,55 +660,13 @@ bool Module::Interface::LoadAmiibo(const std::vector<u8>& buffer) {
 void Module::Interface::CloseAmiibo() {
     LOG_INFO(Service_NFP, "Remove amiibo");
     device_state = DeviceState::TagRemoved;
+    is_data_decoded = false;
     is_application_area_initialized = false;
-    application_area_id = 0;
+    encrypted_tag_data = {};
-    application_area_data.clear();
+    tag_data = {};
     deactivate_event->GetWritableEvent().Signal();
 }
 
-bool Module::Interface::IsAmiiboValid() const {
-    const auto& amiibo_data = tag_data.user_memory;
-    LOG_DEBUG(Service_NFP, "uuid_lock=0x{0:x}", tag_data.lock_bytes);
-    LOG_DEBUG(Service_NFP, "compability_container=0x{0:x}", tag_data.compability_container);
-    LOG_DEBUG(Service_NFP, "crypto_init=0x{0:x}", amiibo_data.crypto_init);
-    LOG_DEBUG(Service_NFP, "write_count={}", amiibo_data.write_count);
-
-    LOG_DEBUG(Service_NFP, "character_id=0x{0:x}", amiibo_data.model_info.character_id);
-    LOG_DEBUG(Service_NFP, "character_variant={}", amiibo_data.model_info.character_variant);
-    LOG_DEBUG(Service_NFP, "amiibo_type={}", amiibo_data.model_info.amiibo_type);
-    LOG_DEBUG(Service_NFP, "model_number=0x{0:x}", amiibo_data.model_info.model_number);
-    LOG_DEBUG(Service_NFP, "series={}", amiibo_data.model_info.series);
-    LOG_DEBUG(Service_NFP, "fixed_value=0x{0:x}", amiibo_data.model_info.fixed);
-
-    LOG_DEBUG(Service_NFP, "tag_dynamic_lock=0x{0:x}", tag_data.dynamic_lock);
-    LOG_DEBUG(Service_NFP, "tag_CFG0=0x{0:x}", tag_data.CFG0);
-    LOG_DEBUG(Service_NFP, "tag_CFG1=0x{0:x}", tag_data.CFG1);
-
-    // Check against all know constants on an amiibo binary
-    if (tag_data.lock_bytes != 0xE00F) {
-        return false;
-    }
-    if (tag_data.compability_container != 0xEEFF10F1U) {
-        return false;
-    }
-    if ((amiibo_data.crypto_init & 0xFF) != 0xA5) {
-        return false;
-    }
-    if (amiibo_data.model_info.fixed != 0x02) {
-        return false;
-    }
-    if ((tag_data.dynamic_lock & 0xFFFFFF) != 0x0F0001) {
-        return false;
-    }
-    if (tag_data.CFG0 != 0x04000000U) {
-        return false;
-    }
-    if (tag_data.CFG1 != 0x5F) {
-        return false;
-    }
-    return true;
-}
-
 Kernel::KReadableEvent& Module::Interface::GetActivateEvent() const {
     return activate_event->GetReadableEvent();
 }
@@ -576,13 +677,20 @@ Kernel::KReadableEvent& Module::Interface::GetDeactivateEvent() const {
 
 void Module::Interface::Initialize() {
     device_state = DeviceState::Initialized;
+    is_data_decoded = false;
+    is_application_area_initialized = false;
+    encrypted_tag_data = {};
+    tag_data = {};
 }
 
 void Module::Interface::Finalize() {
+    if (device_state == DeviceState::TagMounted) {
+        Unmount();
+    }
+    if (device_state == DeviceState::SearchingForTag || device_state == DeviceState::TagRemoved) {
+        StopDetection();
+    }
     device_state = DeviceState::Unaviable;
-    is_application_area_initialized = false;
-    application_area_id = 0;
-    application_area_data.clear();
 }
 
 Result Module::Interface::StartDetection(s32 protocol_) {
@@ -618,42 +726,102 @@ Result Module::Interface::StopDetection() {
     return ErrCodes::WrongDeviceState;
 }
 
-Result Module::Interface::Mount() {
+Result Module::Interface::Flush() {
-    if (device_state == DeviceState::TagFound) {
+    // Ignore write command if we can't encrypt the data
-        device_state = DeviceState::TagMounted;
+    if (!is_data_decoded) {
         return ResultSuccess;
     }
 
+    constexpr auto tag_size_without_password = sizeof(NTAG215File) - sizeof(NTAG215Password);
+    EncryptedNTAG215File tmp_encrypted_tag_data{};
+    const Common::FS::IOFile amiibo_file{file_path, Common::FS::FileAccessMode::ReadWrite,
+                                         Common::FS::FileType::BinaryFile};
+
+    if (!amiibo_file.IsOpen()) {
+        LOG_ERROR(Core, "Amiibo is already on use");
+        return ErrCodes::WriteAmiiboFailed;
+    }
+
+    // Workaround for files with missing password data
+    std::array<u8, sizeof(EncryptedNTAG215File)> buffer{};
+    if (amiibo_file.Read(buffer) < tag_size_without_password) {
+        LOG_ERROR(Core, "Failed to read amiibo file");
+        return ErrCodes::WriteAmiiboFailed;
+    }
+    memcpy(&tmp_encrypted_tag_data, buffer.data(), sizeof(EncryptedNTAG215File));
+
+    if (!AmiiboCrypto::IsAmiiboValid(tmp_encrypted_tag_data)) {
+        LOG_INFO(Service_NFP, "Invalid amiibo");
+        return ErrCodes::WriteAmiiboFailed;
+    }
+
+    bool is_uuid_equal = memcmp(tmp_encrypted_tag_data.uuid.data(), tag_data.uuid.data(), 8) == 0;
+    bool is_character_equal = tmp_encrypted_tag_data.user_memory.model_info.character_id ==
+                              tag_data.model_info.character_id;
+    if (!is_uuid_equal || !is_character_equal) {
+        LOG_ERROR(Core, "Not the same amiibo");
+        return ErrCodes::WriteAmiiboFailed;
+    }
+
+    if (!AmiiboCrypto::EncodeAmiibo(tag_data, encrypted_tag_data)) {
+        LOG_ERROR(Core, "Failed to encode data");
+        return ErrCodes::WriteAmiiboFailed;
+    }
+
+    // Return to the start of the file
+    if (!amiibo_file.Seek(0)) {
+        LOG_ERROR(Service_NFP, "Error writting to file");
+        return ErrCodes::WriteAmiiboFailed;
+    }
+
+    if (!amiibo_file.Write(encrypted_tag_data)) {
+        LOG_ERROR(Service_NFP, "Error writting to file");
+        return ErrCodes::WriteAmiiboFailed;
+    }
+
+    return ResultSuccess;
+}
+
+Result Module::Interface::Mount() {
+    if (device_state != DeviceState::TagFound) {
         LOG_ERROR(Service_NFP, "Wrong device state {}", device_state);
         return ErrCodes::WrongDeviceState;
+    }
+
+    is_data_decoded = AmiiboCrypto::DecodeAmiibo(encrypted_tag_data, tag_data);
+    LOG_INFO(Service_NFP, "Is amiibo decoded {}", is_data_decoded);
+
+    is_application_area_initialized = false;
+    device_state = DeviceState::TagMounted;
+    return ResultSuccess;
 }
 
 Result Module::Interface::Unmount() {
-    if (device_state == DeviceState::TagMounted) {
+    if (device_state != DeviceState::TagMounted) {
-        is_application_area_initialized = false;
-        application_area_id = 0;
-        application_area_data.clear();
-        device_state = DeviceState::TagFound;
-        return ResultSuccess;
-    }
-
         LOG_ERROR(Service_NFP, "Wrong device state {}", device_state);
         return ErrCodes::WrongDeviceState;
+    }
+
+    is_data_decoded = false;
+    is_application_area_initialized = false;
+    device_state = DeviceState::TagFound;
+    return ResultSuccess;
 }
 
 Result Module::Interface::GetTagInfo(TagInfo& tag_info) const {
-    if (device_state == DeviceState::TagFound || device_state == DeviceState::TagMounted) {
+    if (device_state != DeviceState::TagFound && device_state != DeviceState::TagMounted) {
-        tag_info = {
-            .uuid = tag_data.uuid,
-            .uuid_length = static_cast<u8>(tag_data.uuid.size()),
-            .protocol = protocol,
-            .tag_type = static_cast<u32>(tag_data.user_memory.model_info.amiibo_type),
-        };
-        return ResultSuccess;
-    }
-
         LOG_ERROR(Service_NFP, "Wrong device state {}", device_state);
         return ErrCodes::WrongDeviceState;
+    }
+
+    tag_info = {
+        .uuid = encrypted_tag_data.uuid,
+        .uuid_length = static_cast<u8>(encrypted_tag_data.uuid.size()),
+        .protocol = protocol,
+        .tag_type = static_cast<u32>(encrypted_tag_data.user_memory.model_info.amiibo_type),
+    };
+
+    return ResultSuccess;
 }
 
 Result Module::Interface::GetCommonInfo(CommonInfo& common_info) const {
@@ -662,14 +830,28 @@ Result Module::Interface::GetCommonInfo(CommonInfo& common_info) const {
         return ErrCodes::WrongDeviceState;
     }
 
-    // Read this data from the amiibo save file
+    if (is_data_decoded) {
+        const auto& settings = tag_data.settings;
+        // TODO: Validate this data
+        common_info = {
+            .last_write_year = static_cast<u16>(settings.write_date.year.Value()),
+            .last_write_month = static_cast<u8>(settings.write_date.month.Value()),
+            .last_write_day = static_cast<u8>(settings.write_date.day.Value()),
+            .write_counter = settings.crc_counter,
+            .version = 1,
+            .application_area_size = sizeof(ApplicationArea),
+        };
+        return ResultSuccess;
+    }
+
+    // Generate a generic answer
     common_info = {
         .last_write_year = 2022,
         .last_write_month = 2,
         .last_write_day = 7,
-        .write_counter = tag_data.user_memory.write_count,
+        .write_counter = 0,
         .version = 1,
-        .application_area_size = ApplicationAreaSize,
+        .application_area_size = sizeof(ApplicationArea),
     };
     return ResultSuccess;
 }
@@ -680,7 +862,15 @@ Result Module::Interface::GetModelInfo(ModelInfo& model_info) const {
         return ErrCodes::WrongDeviceState;
     }
 
-    model_info = tag_data.user_memory.model_info;
+    const auto& model_info_data = encrypted_tag_data.user_memory.model_info;
+    model_info = {
+        .character_id = model_info_data.character_id,
+        .character_variant = model_info_data.character_variant,
+        .amiibo_type = model_info_data.amiibo_type,
+        .model_number = model_info_data.model_number,
+        .series = model_info_data.series,
+        .constant_value = model_info_data.constant_value,
+    };
     return ResultSuccess;
 }
 
@@ -690,9 +880,30 @@ Result Module::Interface::GetRegisterInfo(RegisterInfo& register_info) const {
         return ErrCodes::WrongDeviceState;
     }
 
-    Service::Mii::MiiManager manager;
+    if (is_data_decoded) {
+        const auto& settings = tag_data.settings;
 
-    // Read this data from the amiibo save file
+        // Amiibo name is u16 while the register info is u8. Figure out how to handle this properly
+        std::array<u8, 11> amiibo_name{};
+        for (std::size_t i = 0; i < sizeof(amiibo_name) - 1; ++i) {
+            amiibo_name[i] = static_cast<u8>(settings.amiibo_name[i]);
+        }
+
+        // TODO: Validate this data
+        register_info = {
+            .mii_char_info = AmiiboCrypto::AmiiboRegisterInfoToMii(tag_data.owner_mii),
+            .first_write_year = static_cast<u16>(settings.init_date.year.Value()),
+            .first_write_month = static_cast<u8>(settings.init_date.month.Value()),
+            .first_write_day = static_cast<u8>(settings.init_date.day.Value()),
+            .amiibo_name = amiibo_name,
+            .unknown = {},
+        };
+
+        return ResultSuccess;
+    }
+
+    // Generate a generic answer
+    Service::Mii::MiiManager manager;
     register_info = {
         .mii_char_info = manager.BuildDefault(0),
         .first_write_year = 2022,
@@ -709,29 +920,39 @@ Result Module::Interface::OpenApplicationArea(u32 access_id) {
         LOG_ERROR(Service_NFP, "Wrong device state {}", device_state);
         return ErrCodes::WrongDeviceState;
     }
-    if (AmiiboApplicationDataExist(access_id)) {
+
-        application_area_data = LoadAmiiboApplicationData(access_id);
+    // Fallback for lack of amiibo keys
-        application_area_id = access_id;
+    if (!is_data_decoded) {
-        is_application_area_initialized = true;
-    }
-    if (!is_application_area_initialized) {
         LOG_WARNING(Service_NFP, "Application area is not initialized");
         return ErrCodes::ApplicationAreaIsNotInitialized;
     }
+
+    if (tag_data.settings.settings.appdata_initialized == 0) {
+        LOG_WARNING(Service_NFP, "Application area is not initialized");
+        return ErrCodes::ApplicationAreaIsNotInitialized;
+    }
+
+    if (tag_data.application_area_id != access_id) {
+        LOG_WARNING(Service_NFP, "Wrong application area id");
+        return ErrCodes::WrongApplicationAreaId;
+    }
+
+    is_application_area_initialized = true;
     return ResultSuccess;
 }
 
-Result Module::Interface::GetApplicationArea(std::vector<u8>& data) const {
+Result Module::Interface::GetApplicationArea(ApplicationArea& data) const {
     if (device_state != DeviceState::TagMounted) {
         LOG_ERROR(Service_NFP, "Wrong device state {}", device_state);
         return ErrCodes::WrongDeviceState;
     }
+
     if (!is_application_area_initialized) {
         LOG_ERROR(Service_NFP, "Application area is not initialized");
         return ErrCodes::ApplicationAreaIsNotInitialized;
     }
 
-    data = application_area_data;
+    data = tag_data.application_area;
 
     return ResultSuccess;
 }
@@ -741,12 +962,18 @@ Result Module::Interface::SetApplicationArea(const std::vector<u8>& data) {
         LOG_ERROR(Service_NFP, "Wrong device state {}", device_state);
         return ErrCodes::WrongDeviceState;
     }
+
     if (!is_application_area_initialized) {
         LOG_ERROR(Service_NFP, "Application area is not initialized");
         return ErrCodes::ApplicationAreaIsNotInitialized;
     }
-    application_area_data = data;
+
-    SaveAmiiboApplicationData(application_area_id, application_area_data);
+    if (data.size() != sizeof(ApplicationArea)) {
+        LOG_ERROR(Service_NFP, "Wrong data size {}", data.size());
+        return ResultUnknown;
+    }
+
+    std::memcpy(&tag_data.application_area, data.data(), sizeof(ApplicationArea));
     return ResultSuccess;
 }
 
@@ -755,32 +982,23 @@ Result Module::Interface::CreateApplicationArea(u32 access_id, const std::vector
         LOG_ERROR(Service_NFP, "Wrong device state {}", device_state);
         return ErrCodes::WrongDeviceState;
     }
-    if (AmiiboApplicationDataExist(access_id)) {
+
+    if (tag_data.settings.settings.appdata_initialized != 0) {
         LOG_ERROR(Service_NFP, "Application area already exist");
         return ErrCodes::ApplicationAreaExist;
     }
-    application_area_data = data;
+
-    application_area_id = access_id;
+    if (data.size() != sizeof(ApplicationArea)) {
-    SaveAmiiboApplicationData(application_area_id, application_area_data);
+        LOG_ERROR(Service_NFP, "Wrong data size {}", data.size());
+        return ResultUnknown;
+    }
+
+    std::memcpy(&tag_data.application_area, data.data(), sizeof(ApplicationArea));
+    tag_data.application_area_id = access_id;
+
     return ResultSuccess;
 }
 
-bool Module::Interface::AmiiboApplicationDataExist(u32 access_id) const {
-    // TODO(german77): Check if file exist
-    return false;
-}
-
-std::vector<u8> Module::Interface::LoadAmiiboApplicationData(u32 access_id) const {
-    // TODO(german77): Read file
-    std::vector<u8> data(ApplicationAreaSize);
-    return data;
-}
-
-void Module::Interface::SaveAmiiboApplicationData(u32 access_id,
-                                                  const std::vector<u8>& data) const {
-    // TODO(german77): Save file
-}
-
 u64 Module::Interface::GetHandle() const {
     // Generate a handle based of the npad id
     return static_cast<u64>(npad_id);
@@ -794,15 +1012,6 @@ Core::HID::NpadIdType Module::Interface::GetNpadId() const {
     return npad_id;
 }
 
-u32 Module::Interface::GetTagPassword(const TagUuid& uuid) const {
-    // Verifiy that the generated password is correct
-    u32 password = 0xAA ^ (uuid[1] ^ uuid[3]);
-    password &= (0x55 ^ (uuid[2] ^ uuid[4])) << 8;
-    password &= (0xAA ^ (uuid[3] ^ uuid[5])) << 16;
-    password &= (0x55 ^ (uuid[4] ^ uuid[6])) << 24;
-    return password;
-}
-
 void InstallInterfaces(SM::ServiceManager& service_manager, Core::System& system) {
     auto module = std::make_shared<Module>();
     std::make_shared<NFP_User>(module, system)->InstallAsService(service_manager);

src/core/hle/service/nfp/nfp.h

@@ -9,6 +9,7 @@
 #include "common/common_funcs.h"
 #include "core/hle/service/kernel_helpers.h"
 #include "core/hle/service/mii/types.h"
+#include "core/hle/service/nfp/amiibo_types.h"
 #include "core/hle/service/service.h"
 
 namespace Kernel {
@@ -21,72 +22,6 @@ enum class NpadIdType : u32;
 } // namespace Core::HID
 
 namespace Service::NFP {
-
-enum class ServiceType : u32 {
-    User,
-    Debug,
-    System,
-};
-
-enum class State : u32 {
-    NonInitialized,
-    Initialized,
-};
-
-enum class DeviceState : u32 {
-    Initialized,
-    SearchingForTag,
-    TagFound,
-    TagRemoved,
-    TagMounted,
-    Unaviable,
-    Finalized,
-};
-
-enum class ModelType : u32 {
-    Amiibo,
-};
-
-enum class MountTarget : u32 {
-    Rom,
-    Ram,
-    All,
-};
-
-enum class AmiiboType : u8 {
-    Figure,
-    Card,
-    Yarn,
-};
-
-enum class AmiiboSeries : u8 {
-    SuperSmashBros,
-    SuperMario,
-    ChibiRobo,
-    YoshiWoollyWorld,
-    Splatoon,
-    AnimalCrossing,
-    EightBitMario,
-    Skylanders,
-    Unknown8,
-    TheLegendOfZelda,
-    ShovelKnight,
-    Unknown11,
-    Kiby,
-    Pokemon,
-    MarioSportsSuperstars,
-    MonsterHunter,
-    BoxBoy,
-    Pikmin,
-    FireEmblem,
-    Metroid,
-    Others,
-    MegaMan,
-    Diablo
-};
-
-using TagUuid = std::array<u8, 10>;
-
 struct TagInfo {
     TagUuid uuid;
     u8 uuid_length;
@@ -114,10 +49,8 @@ struct ModelInfo {
     AmiiboType amiibo_type;
     u16 model_number;
     AmiiboSeries series;
-    u8 fixed;                   // Must be 02
+    u8 constant_value;          // Must be 02
-    INSERT_PADDING_BYTES(0x4);  // Unknown
+    INSERT_PADDING_BYTES(0x38); // Unknown
-    INSERT_PADDING_BYTES(0x20); // Probably a SHA256-(HMAC?) hash
-    INSERT_PADDING_BYTES(0x14); // SHA256-HMAC
 };
 static_assert(sizeof(ModelInfo) == 0x40, "ModelInfo is an invalid size");
 
@@ -126,7 +59,7 @@ struct RegisterInfo {
     u16 first_write_year;
     u8 first_write_month;
     u8 first_write_day;
-    std::array<u8, 11> amiibo_name;
+    std::array<u8, 0xA + 1> amiibo_name;
     u8 unknown;
     INSERT_PADDING_BYTES(0x98);
 };
@@ -140,39 +73,9 @@ public:
                            const char* name);
         ~Interface() override;
 
-        struct EncryptedAmiiboFile {
-            u16 crypto_init;             // Must be A5 XX
-            u16 write_count;             // Number of times the amiibo has been written?
-            INSERT_PADDING_BYTES(0x20);  // System crypts
-            INSERT_PADDING_BYTES(0x20);  // SHA256-(HMAC?) hash
-            ModelInfo model_info;        // This struct is bigger than documentation
-            INSERT_PADDING_BYTES(0xC);   // SHA256-HMAC
-            INSERT_PADDING_BYTES(0x114); // section 1 encrypted buffer
-            INSERT_PADDING_BYTES(0x54);  // section 2 encrypted buffer
-        };
-        static_assert(sizeof(EncryptedAmiiboFile) == 0x1F8, "AmiiboFile is an invalid size");
-
-        struct NTAG215Password {
-            u32 PWD;  // Password to allow write access
-            u16 PACK; // Password acknowledge reply
-            u16 RFUI; // Reserved for future use
-        };
-        static_assert(sizeof(NTAG215Password) == 0x8, "NTAG215Password is an invalid size");
-
-        struct NTAG215File {
-            TagUuid uuid;                    // Unique serial number
-            u16 lock_bytes;                  // Set defined pages as read only
-            u32 compability_container;       // Defines available memory
-            EncryptedAmiiboFile user_memory; // Writable data
-            u32 dynamic_lock;                // Dynamic lock
-            u32 CFG0;                        // Defines memory protected by password
-            u32 CFG1;                        // Defines number of verification attempts
-            NTAG215Password password;        // Password data
-        };
-        static_assert(sizeof(NTAG215File) == 0x21C, "NTAG215File is an invalid size");
-
         void CreateUserInterface(Kernel::HLERequestContext& ctx);
-        bool LoadAmiibo(const std::vector<u8>& buffer);
+        bool LoadAmiibo(const std::string& filename);
+        bool LoadAmiiboFile(const std::string& filename);
         void CloseAmiibo();
 
         void Initialize();
@@ -182,6 +85,7 @@ public:
         Result StopDetection();
         Result Mount();
         Result Unmount();
+        Result Flush();
 
         Result GetTagInfo(TagInfo& tag_info) const;
         Result GetCommonInfo(CommonInfo& common_info) const;
@@ -189,7 +93,7 @@ public:
         Result GetRegisterInfo(RegisterInfo& register_info) const;
 
         Result OpenApplicationArea(u32 access_id);
-        Result GetApplicationArea(std::vector<u8>& data) const;
+        Result GetApplicationArea(ApplicationArea& data) const;
         Result SetApplicationArea(const std::vector<u8>& data);
         Result CreateApplicationArea(u32 access_id, const std::vector<u8>& data);
 
@@ -204,27 +108,19 @@ public:
         std::shared_ptr<Module> module;
 
     private:
-        /// Validates that the amiibo file is not corrupted
-        bool IsAmiiboValid() const;
-
-        bool AmiiboApplicationDataExist(u32 access_id) const;
-        std::vector<u8> LoadAmiiboApplicationData(u32 access_id) const;
-        void SaveAmiiboApplicationData(u32 access_id, const std::vector<u8>& data) const;
-
-        /// return password needed to allow write access to protected memory
-        u32 GetTagPassword(const TagUuid& uuid) const;
-
         const Core::HID::NpadIdType npad_id;
 
-        DeviceState device_state{DeviceState::Unaviable};
+        bool is_data_decoded{};
-        KernelHelpers::ServiceContext service_context;
+        bool is_application_area_initialized{};
+        s32 protocol;
+        std::string file_path{};
         Kernel::KEvent* activate_event;
         Kernel::KEvent* deactivate_event;
+        DeviceState device_state{DeviceState::Unaviable};
+        KernelHelpers::ServiceContext service_context;
+
         NTAG215File tag_data{};
-        s32 protocol;
+        EncryptedNTAG215File encrypted_tag_data{};
-        bool is_application_area_initialized{};
-        u32 application_area_id;
-        std::vector<u8> application_area_data;
     };
 };
 
@@ -243,6 +139,7 @@ private:
     void OpenApplicationArea(Kernel::HLERequestContext& ctx);
     void GetApplicationArea(Kernel::HLERequestContext& ctx);
     void SetApplicationArea(Kernel::HLERequestContext& ctx);
+    void Flush(Kernel::HLERequestContext& ctx);
     void CreateApplicationArea(Kernel::HLERequestContext& ctx);
     void GetTagInfo(Kernel::HLERequestContext& ctx);
     void GetRegisterInfo(Kernel::HLERequestContext& ctx);

src/yuzu/main.cpp

@@ -3254,26 +3254,7 @@ void GMainWindow::LoadAmiibo(const QString& filename) {
         return;
     }
 
-    QFile nfc_file{filename};
+    if (!nfc->LoadAmiibo(filename.toStdString())) {
-    if (!nfc_file.open(QIODevice::ReadOnly)) {
-        QMessageBox::warning(this, tr("Error opening Amiibo data file"),
-                             tr("Unable to open Amiibo file \"%1\" for reading.").arg(filename));
-        return;
-    }
-
-    const u64 nfc_file_size = nfc_file.size();
-    std::vector<u8> buffer(nfc_file_size);
-    const u64 read_size = nfc_file.read(reinterpret_cast<char*>(buffer.data()), nfc_file_size);
-    if (nfc_file_size != read_size) {
-        QMessageBox::warning(this, tr("Error reading Amiibo data file"),
-                             tr("Unable to fully read Amiibo data. Expected to read %1 bytes, but "
-                                "was only able to read %2 bytes.")
-                                 .arg(nfc_file_size)
-                                 .arg(read_size));
-        return;
-    }
-
-    if (!nfc->LoadAmiibo(buffer)) {
         QMessageBox::warning(this, tr("Error loading Amiibo data"),
                              tr("Unable to load Amiibo data."));
     }