From e1029f9213ba3df2b3b1774c4085df9df67352de Mon Sep 17 00:00:00 2001 From: Rob Austein Date: Fri, 5 Jun 2015 15:23:31 -0400 Subject: This time for sure, Rocky! --- pbkdf2.c | 29 ++++++++++++++--------------- 1 file changed, 14 insertions(+), 15 deletions(-) (limited to 'pbkdf2.c') diff --git a/pbkdf2.c b/pbkdf2.c index 1ed8332..24d986f 100644 --- a/pbkdf2.c +++ b/pbkdf2.c @@ -86,7 +86,7 @@ hal_error_t hal_pbkdf2(const hal_hash_descriptor_t * const descriptor, uint8_t * derived_key, size_t derived_key_length, unsigned iterations_desired) { - uint8_t ac[HAL_MAX_HASH_DIGEST_LENGTH], mac[HAL_MAX_HASH_DIGEST_LENGTH]; + uint8_t result[HAL_MAX_HASH_DIGEST_LENGTH], mac[HAL_MAX_HASH_DIGEST_LENGTH]; uint8_t statebuf[1024]; unsigned iteration; hal_error_t err; @@ -99,15 +99,15 @@ hal_error_t hal_pbkdf2(const hal_hash_descriptor_t * const descriptor, return HAL_ERROR_BAD_ARGUMENTS; assert(sizeof(statebuf) >= descriptor->hmac_state_length); - assert(sizeof(ac) >= descriptor->digest_length); + assert(sizeof(result) >= descriptor->digest_length); assert(sizeof(mac) >= descriptor->digest_length); /* Output length check per RFC 2989 5.2. */ if ((uint64_t) derived_key_length > ((uint64_t) 0xFFFFFFFF) * descriptor->block_length) return HAL_ERROR_UNSUPPORTED_KEY; - memset(ac, 0, sizeof(ac)); - memset(mac, 0, sizeof(mac)); + memset(result, 0, sizeof(result)); + memset(mac, 0, sizeof(mac)); /* * We probably should check here to see whether the password is @@ -126,43 +126,42 @@ hal_error_t hal_pbkdf2(const hal_hash_descriptor_t * const descriptor, /* * Initial HMAC is of the salt concatenated with the block count. - * This seeds the accumulator, and constitutes iteration one. + * This seeds the result, and constitutes iteration one. */ if ((err = do_hmac(descriptor, password, password_length, salt, salt_length, block, mac, sizeof(mac))) != HAL_OK) return err; - memcpy(ac, mac, descriptor->digest_length); + memcpy(result, mac, descriptor->digest_length); /* * Now iterate however many times the caller requested, XORing the - * result back into the accumulator on each iteration. + * HMAC back into the result on each iteration. */ for (iteration = 2; iteration <= iterations_desired; iteration++) { if ((err = do_hmac(descriptor, password, password_length, - ac, descriptor->digest_length, + mac, descriptor->digest_length, 0, mac, sizeof(mac))) != HAL_OK) return err; for (i = 0; i < descriptor->digest_length; i++) - ac[i] ^= mac[i]; + result[i] ^= mac[i]; } /* - * Accumulator holds the generated block. Save it, then exit or - * loop for another block. + * Save result block, then exit or loop for another block. */ if (derived_key_length > descriptor->digest_length) { - memcpy(derived_key, ac, descriptor->digest_length); - derived_key += descriptor->digest_length; - derived_key_length -= descriptor->digest_length; + memcpy(derived_key, result, descriptor->digest_length); + derived_key += descriptor->digest_length; + derived_key_length -= descriptor->digest_length; } else { - memcpy(derived_key, ac, derived_key_length); + memcpy(derived_key, result, derived_key_length); return HAL_OK; } } -- cgit v1.2.3