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Implement SE XTS driver code for fusee

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This commit is contained in:
Michael Scire 2018-03-25 18:50:56 -06:00
parent 53cf46d20f
commit 9ab7d66524
2 changed files with 72 additions and 0 deletions
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70
fusee/src/se.c
View file

@ -386,6 +386,76 @@ void shift_left_xor_rb(uint8_t *key) {
}
}
void aes_128_xts_nintendo_get_tweak(uint8_t *tweak, size_t sector) {
for (int i = 0xF; i >= 0; i--) { /* Nintendo LE custom tweak... */
tweak[i] = (unsigned char)(sector & 0xFF);
sector >>= 8;
}
}
void aes_128_xts_nintendo_xor_with_tweak(unsigned int keyslot, size_t sector, uint8_t *dst, const uint8_t *src, size_t size) {
if ((size & 0xF) || size == 0) {
generic_panic();
}
uint8_t tweak[0x10];
aes_128_xts_nintendo_get_tweak(tweak, sector);
se_aes_128_ecb_encrypt_block(keyslot, tweak, sizeof(tweak), tweak, sizeof(tweak));
for (unsigned int block = 0; block < (size >> 4); block++) {
for (unsigned int i = 0; i < 0x10; i++) {
dst[(block << 4) | i] = src[(block << 4) | i] ^ tweak[i];
}
shift_left_xor_rb(tweak);
}
}
void aes_128_xts_nintendo_crypt_sector(unsigned int keyslot_1, unsigned int keyslot_2, size_t sector, bool encrypt, void *dst, const void *src, size_t size) {
if ((size & 0xF) || size == 0) {
generic_panic();
}
/* XOR. */
aes_128_xts_nintendo_xor_with_tweak(keyslot_2, sector, dst, src, size);
/* Encrypt/Decrypt. */
if (encrypt) {
SECURITY_ENGINE->CONFIG_REG = (ALG_AES_ENC | DST_MEMORY);
SECURITY_ENGINE->CRYPTO_REG = keyslot_1 << 24 | 0x100;
} else {
SECURITY_ENGINE->CONFIG_REG = (ALG_AES_DEC | DST_MEMORY);
SECURITY_ENGINE->CRYPTO_REG = keyslot_1 << 24;
}
SECURITY_ENGINE->BLOCK_COUNT_REG = (size >> 4) - 1;
trigger_se_blocking_op(OP_START, dst, size, src, size);
/* XOR. */
aes_128_xts_nintendo_xor_with_tweak(keyslot_2, sector, dst, dst, size);
}
/* Encrypt with AES-XTS (Nintendo's custom tweak). */
void se_aes_128_xts_nintendo_encrypt(unsigned int keyslot_1, unsigned int keyslot_2, size_t base_sector, void *dst, const void *src, size_t size, unsigned int sector_size) {
if ((size & 0xF) || size == 0) {
generic_panic();
}
size_t sector = base_sector;
for (size_t ofs = 0; ofs < size; ofs += sector_size) {
aes_128_xts_nintendo_crypt_sector(keyslot_1, keyslot_2, sector, true, dst, src, sector_size);
sector++;
}
}
/* Decrypt with AES-XTS (Nintendo's custom tweak). */
void se_aes_128_xts_nintendo_decrypt(unsigned int keyslot_1, unsigned int keyslot_2, size_t base_sector, void *dst, const void *src, size_t size, unsigned int sector_size) {
if ((size & 0xF) || size == 0) {
generic_panic();
}
size_t sector = base_sector;
for (size_t ofs = 0; ofs < size; ofs += sector_size) {
aes_128_xts_nintendo_crypt_sector(keyslot_1, keyslot_2, sector, false, dst, src, sector_size);
sector++;
}
}
void se_compute_aes_cmac(unsigned int keyslot, void *cmac, size_t cmac_size, const void *data, size_t data_size, unsigned int config_high) {
if (keyslot >= KEYSLOT_AES_MAX) {
generic_panic();

2
fusee/src/se.h
View file

@ -183,6 +183,8 @@ void set_aes_keyslot_iv(unsigned int keyslot, const void *iv, size_t iv_size);
void set_se_ctr(const void *ctr);
/* Secure AES API */
void se_aes_128_xts_nintendo_decrypt(unsigned int keyslot_1, unsigned int keyslot_2, unsigned int base_sector, void *dst, const void *src, size_t size, unsigned int sector_size);
void se_aes_128_xts_nintendo_encrypt(unsigned int keyslot_1, unsigned int keyslot_2, unsigned int base_sector, void *dst, const void *src, size_t size, unsigned int sector_size);
void se_compute_aes_128_cmac(unsigned int keyslot, void *cmac, size_t cmac_size, const void *data, size_t data_size);
void se_compute_aes_256_cmac(unsigned int keyslot, void *cmac, size_t cmac_size, const void *data, size_t data_size);
void se_aes_128_ecb_encrypt_block(unsigned int keyslot, void *dst, size_t dst_size, const void *src, size_t src_size);