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bdk: se: add more useful functions

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- aes cmac 128bit
- aes hashing
- option to clear updated aes iv
This commit is contained in:
CTCaer 2023-12-25 03:44:52 +02:00
parent 39abeb9a28
commit e47a819948
2 changed files with 90 additions and 0 deletions
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87
bdk/sec/se.c
View file

@ -281,6 +281,14 @@ void se_aes_iv_clear(u32 ks)
}
}
void se_aes_iv_updated_clear(u32 ks)
{
for (u32 i = 0; i < (SE_AES_IV_SIZE / 4); i++)
{
SE(SE_CRYPTO_KEYTABLE_ADDR_REG) = SE_KEYTABLE_SLOT(ks) | SE_KEYTABLE_QUAD(UPDATED_IV) | SE_KEYTABLE_PKT(i);
SE(SE_CRYPTO_KEYTABLE_DATA_REG) = 0;
}
}
int se_aes_unwrap_key(u32 ks_dst, u32 ks_src, const void *input)
{
@ -292,6 +300,26 @@ int se_aes_unwrap_key(u32 ks_dst, u32 ks_src, const void *input)
return _se_execute_oneshot(SE_OP_START, NULL, 0, input, SE_KEY_128_SIZE);
}
int se_aes_crypt_hash(u32 ks, u32 enc, void *dst, u32 dst_size, const void *src, u32 src_size)
{
if (enc)
{
SE(SE_CONFIG_REG) = SE_CONFIG_ENC_ALG(ALG_AES_ENC) | SE_CONFIG_DST(DST_MEMORY);
SE(SE_CRYPTO_CONFIG_REG) = SE_CRYPTO_KEY_INDEX(ks) | SE_CRYPTO_VCTRAM_SEL(VCTRAM_AESOUT) |
SE_CRYPTO_CORE_SEL(CORE_ENCRYPT) | SE_CRYPTO_XOR_POS(XOR_TOP) |
SE_CRYPTO_HASH(HASH_ENABLE);
}
else
{
SE(SE_CONFIG_REG) = SE_CONFIG_DEC_ALG(ALG_AES_DEC) | SE_CONFIG_DST(DST_MEMORY);
SE(SE_CRYPTO_CONFIG_REG) = SE_CRYPTO_KEY_INDEX(ks) | SE_CRYPTO_VCTRAM_SEL(VCTRAM_PREVMEM) |
SE_CRYPTO_CORE_SEL(CORE_DECRYPT) | SE_CRYPTO_XOR_POS(XOR_BOTTOM) |
SE_CRYPTO_HASH(HASH_ENABLE);
}
SE(SE_CRYPTO_BLOCK_COUNT_REG) = (src_size >> 4) - 1;
return _se_execute_oneshot(SE_OP_START, dst, dst_size, src, src_size);
}
int se_aes_crypt_ecb(u32 ks, u32 enc, void *dst, u32 dst_size, const void *src, u32 src_size)
{
if (enc)
@ -620,3 +648,62 @@ void se_get_aes_keys(u8 *buf, u8 *keys, u32 keysize)
se_aes_crypt_cbc(3, DECRYPT, keys, SE_AES_KEYSLOT_COUNT * keysize, keys, SE_AES_KEYSLOT_COUNT * keysize);
se_aes_key_clear(3);
}
int se_aes_cmac_128(u32 ks, void *dst, const void *src, u32 src_size)
{
int res = 0;
u8 *key = (u8 *)calloc(1, SE_KEY_128_SIZE);
u8 *last_block = (u8 *)calloc(1, SE_AES_BLOCK_SIZE);
se_aes_iv_clear(ks);
se_aes_iv_updated_clear(ks);
// Generate sub key
if (!se_aes_crypt_hash(ks, ENCRYPT, key, SE_KEY_128_SIZE, key, SE_KEY_128_SIZE))
goto out;
_gf256_mul_x(key);
if (src_size & 0xF)
_gf256_mul_x(key);
SE(SE_CONFIG_REG) = SE_CONFIG_ENC_MODE(MODE_KEY128) | SE_CONFIG_ENC_ALG(ALG_AES_ENC) | SE_CONFIG_DST(DST_HASHREG);
SE(SE_CRYPTO_CONFIG_REG) = SE_CRYPTO_KEY_INDEX(ks) | SE_CRYPTO_INPUT_SEL(INPUT_MEMORY) |
SE_CRYPTO_XOR_POS(XOR_TOP) | SE_CRYPTO_VCTRAM_SEL(VCTRAM_AESOUT) | SE_CRYPTO_HASH(HASH_ENABLE) |
SE_CRYPTO_CORE_SEL(CORE_ENCRYPT);
se_aes_iv_clear(ks);
se_aes_iv_updated_clear(ks);
u32 num_blocks = (src_size + 0xf) >> 4;
if (num_blocks > 1)
{
SE(SE_CRYPTO_BLOCK_COUNT_REG) = num_blocks - 2;
if (!_se_execute_oneshot(SE_OP_START, NULL, 0, src, src_size))
goto out;
SE(SE_CRYPTO_CONFIG_REG) |= SE_CRYPTO_IV_SEL(IV_UPDATED);
}
if (src_size & 0xf)
{
memcpy(last_block, src + (src_size & ~0xf), src_size & 0xf);
last_block[src_size & 0xf] = 0x80;
}
else if (src_size >= SE_AES_BLOCK_SIZE)
{
memcpy(last_block, src + src_size - SE_AES_BLOCK_SIZE, SE_AES_BLOCK_SIZE);
}
for (u32 i = 0; i < SE_KEY_128_SIZE; i++)
last_block[i] ^= key[i];
SE(SE_CRYPTO_BLOCK_COUNT_REG) = 0;
res = _se_execute_oneshot(SE_OP_START, NULL, 0, last_block, SE_AES_BLOCK_SIZE);
u32 *dst32 = (u32 *)dst;
for (u32 i = 0; i < (SE_KEY_128_SIZE / 4); i++)
dst32[i] = SE(SE_HASH_RESULT_REG + (i * 4));
out:;
free(key);
free(last_block);
return res;
}

3
bdk/sec/se.h
View file

@ -30,7 +30,9 @@ void se_aes_iv_set(u32 ks, void *iv);
void se_aes_key_get(u32 ks, void *key, u32 size);
void se_aes_key_clear(u32 ks);
void se_aes_iv_clear(u32 ks);
void se_aes_iv_updated_clear(u32 ks);
int se_aes_unwrap_key(u32 ks_dst, u32 ks_src, const void *input);
int se_aes_crypt_hash(u32 ks, u32 enc, void *dst, u32 dst_size, const void *src, u32 src_size);
int se_aes_crypt_cbc(u32 ks, u32 enc, void *dst, u32 dst_size, const void *src, u32 src_size);
int se_aes_crypt_ecb(u32 ks, u32 enc, void *dst, u32 dst_size, const void *src, u32 src_size);
int se_aes_crypt_block_ecb(u32 ks, u32 enc, void *dst, const void *src);
@ -42,5 +44,6 @@ int se_calc_sha256(void *hash, u32 *msg_left, const void *src, u32 src_size, u6
int se_calc_sha256_oneshot(void *hash, const void *src, u32 src_size);
int se_calc_sha256_finalize(void *hash, u32 *msg_left);
int se_gen_prng128(void *dst);
int se_aes_cmac_128(u32 ks, void *dst, const void *src, u32 src_size);
#endif