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bdk: se: deduplicate sha hash extraction

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CTCaer 2023-12-27 21:07:52 +02:00
parent 2cc6cd45d9
commit 92093ff08e
1 changed files with 30 additions and 25 deletions
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55
bdk/sec/se.c
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@ -487,6 +487,23 @@ int se_aes_xts_crypt(u32 tweak_ks, u32 crypt_ks, u32 enc, u64 sec, void *dst, vo
return 1;
}
static void se_calc_sha256_get_hash(void *hash, u32 *msg_left)
{
u32 hash32[SE_SHA_256_SIZE / 4];
// Backup message left.
if (msg_left)
{
msg_left[0] = SE(SE_SHA_MSG_LEFT_0_REG);
msg_left[1] = SE(SE_SHA_MSG_LEFT_1_REG);
}
// Copy output hash.
for (u32 i = 0; i < (SE_SHA_256_SIZE / 4); i++)
hash32[i] = byte_swap_32(SE(SE_HASH_RESULT_REG + (i * 4)));
memcpy(hash, hash32, SE_SHA_256_SIZE);
}
int se_calc_sha256(void *hash, u32 *msg_left, const void *src, u32 src_size, u64 total_size, u32 sha_cfg, bool is_oneshot)
{
int res;
@ -496,6 +513,17 @@ int se_calc_sha256(void *hash, u32 *msg_left, const void *src, u32 src_size, u64
if (src_size > 0xFFFFFF || !hash) // Max 16MB - 1 chunks and aligned x4 hash buffer.
return 0;
// Src size of 0 is not supported, so return null string sha256.
// if (!src_size)
// {
// const u8 null_hash[SE_SHA_256_SIZE] = {
// 0xE3, 0xB0, 0xC4, 0x42, 0x98, 0xFC, 0x1C, 0x14, 0x9A, 0xFB, 0xF4, 0xC8, 0x99, 0x6F, 0xB9, 0x24,
// 0x27, 0xAE, 0x41, 0xE4, 0x64, 0x9B, 0x93, 0x4C, 0xA4, 0x95, 0x99, 0x1B, 0x78, 0x52, 0xB8, 0x55
// };
// memcpy(hash, null_hash, SE_SHA_256_SIZE);
// return 1;
// }
// Setup config for SHA256.
SE(SE_CONFIG_REG) = SE_CONFIG_ENC_MODE(MODE_SHA256) | SE_CONFIG_ENC_ALG(ALG_SHA) | SE_CONFIG_DST(DST_HASHREG);
SE(SE_SHA_CONFIG_REG) = sha_cfg;
@ -534,19 +562,7 @@ int se_calc_sha256(void *hash, u32 *msg_left, const void *src, u32 src_size, u64
res = _se_execute(SE_OP_START, NULL, 0, src, src_size, is_oneshot);
if (is_oneshot)
{
// Backup message left.
if (msg_left)
{
msg_left[0] = SE(SE_SHA_MSG_LEFT_0_REG);
msg_left[1] = SE(SE_SHA_MSG_LEFT_1_REG);
}
// Copy output hash.
for (u32 i = 0; i < (SE_SHA_256_SIZE / 4); i++)
hash32[i] = byte_swap_32(SE(SE_HASH_RESULT_REG + (i * 4)));
memcpy(hash, hash32, SE_SHA_256_SIZE);
}
se_calc_sha256_get_hash(hash, msg_left);
return res;
}
@ -558,20 +574,9 @@ int se_calc_sha256_oneshot(void *hash, const void *src, u32 src_size)
int se_calc_sha256_finalize(void *hash, u32 *msg_left)
{
u32 hash32[SE_SHA_256_SIZE / 4];
int res = _se_execute_finalize();
// Backup message left.
if (msg_left)
{
msg_left[0] = SE(SE_SHA_MSG_LEFT_0_REG);
msg_left[1] = SE(SE_SHA_MSG_LEFT_1_REG);
}
// Copy output hash.
for (u32 i = 0; i < (SE_SHA_256_SIZE / 4); i++)
hash32[i] = byte_swap_32(SE(SE_HASH_RESULT_REG + (i * 4)));
memcpy(hash, hash32, SE_SHA_256_SIZE);
se_calc_sha256_get_hash(hash, msg_left);
return res;
}