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refactor pbkdf2 functions to make them more readable

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pull/25/head
Pavol Rusnak 6 years ago
parent b679a6b2a7
commit 9c2cfb0470
No known key found for this signature in database
GPG Key ID: 91F3B339B9A02A3D
1 changed files with 26 additions and 27 deletions
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53
pbkdf2.c
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@ -79,25 +79,24 @@ void pbkdf2_hmac_sha256_Final(PBKDF2_HMAC_SHA256_CTX *pctx, uint8_t *key)
void pbkdf2_hmac_sha256(const uint8_t *pass, int passlen, const uint8_t *salt, int saltlen, uint32_t iterations, uint8_t *key, int keylen)
{
uint32_t blocks_count = (keylen + SHA256_DIGEST_LENGTH - 1) / SHA256_DIGEST_LENGTH;
int unfinished_key_size = keylen;
uint32_t last_block_size = keylen % SHA256_DIGEST_LENGTH;
uint32_t blocks_count = keylen / SHA256_DIGEST_LENGTH;
if (last_block_size) {
blocks_count++;
} else {
last_block_size = SHA256_DIGEST_LENGTH;
}
for (uint32_t blocknr = 1; blocknr <= blocks_count; blocknr++) {
PBKDF2_HMAC_SHA256_CTX pctx;
pbkdf2_hmac_sha256_Init(&pctx, pass, passlen, salt, saltlen, blocknr);
pbkdf2_hmac_sha256_Update(&pctx, iterations);
unsigned int key_offset = (blocknr - 1) * SHA256_DIGEST_LENGTH;
uint8_t diggest[SHA256_DIGEST_LENGTH];
pbkdf2_hmac_sha256_Final(&pctx, diggest);
if (unfinished_key_size > SHA256_DIGEST_LENGTH) {
memcpy(key + key_offset, diggest, SHA256_DIGEST_LENGTH);
unfinished_key_size -= SHA256_DIGEST_LENGTH;
uint8_t digest[SHA256_DIGEST_LENGTH];
pbkdf2_hmac_sha256_Final(&pctx, digest);
uint32_t key_offset = (blocknr - 1) * SHA256_DIGEST_LENGTH;
if (blocknr < blocks_count) {
memcpy(key + key_offset, digest, SHA256_DIGEST_LENGTH);
} else {
memcpy(key + key_offset, diggest, unfinished_key_size);
unfinished_key_size = 0;
memcpy(key + key_offset, digest, last_block_size);
}
}
}
@ -155,24 +154,24 @@ void pbkdf2_hmac_sha512_Final(PBKDF2_HMAC_SHA512_CTX *pctx, uint8_t *key)
void pbkdf2_hmac_sha512(const uint8_t *pass, int passlen, const uint8_t *salt, int saltlen, uint32_t iterations, uint8_t *key, int keylen)
{
uint32_t blocks_count = (keylen + SHA512_DIGEST_LENGTH - 1) / SHA512_DIGEST_LENGTH;
int unfinished_key_size = keylen;
uint32_t last_block_size = keylen % SHA512_DIGEST_LENGTH;
uint32_t blocks_count = keylen / SHA512_DIGEST_LENGTH;
if (last_block_size) {
blocks_count++;
} else {
last_block_size = SHA512_DIGEST_LENGTH;
}
for (uint32_t blocknr = 1; blocknr <= blocks_count; blocknr++) {
PBKDF2_HMAC_SHA512_CTX pctx;
pbkdf2_hmac_sha512_Init(&pctx, pass, passlen, salt, saltlen, blocknr);
pbkdf2_hmac_sha512_Update(&pctx, iterations);
unsigned int key_offset = (blocknr - 1) * SHA512_DIGEST_LENGTH;
uint8_t diggest[SHA512_DIGEST_LENGTH];
pbkdf2_hmac_sha512_Final(&pctx, diggest);
if (unfinished_key_size > SHA512_DIGEST_LENGTH) {
memcpy(key + key_offset, diggest, SHA512_DIGEST_LENGTH);
unfinished_key_size -= SHA512_DIGEST_LENGTH;
uint8_t digest[SHA512_DIGEST_LENGTH];
pbkdf2_hmac_sha512_Final(&pctx, digest);
uint32_t key_offset = (blocknr - 1) * SHA512_DIGEST_LENGTH;
if (blocknr < blocks_count) {
memcpy(key + key_offset, digest, SHA512_DIGEST_LENGTH);
} else {
memcpy(key + key_offset, diggest, unfinished_key_size);
unfinished_key_size = 0;
memcpy(key + key_offset, digest, last_block_size);
}
}
}

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