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Crypto: remove specific PBKDF2 optimization for block index encoding (except in 16-bit bootloader) in order to make code clearer and avoid bad usage in the future if this implementation is used to generate more bytes than today.

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This commit is contained in:
Mounir IDRASSI 2016-09-24 23:25:58 +02:00
parent 7c154a3f26
commit 194b641ebd
No known key found for this signature in database
GPG Key ID: DD0C382D5FCFB8FC
2 changed files with 19 additions and 6 deletions
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24
src/Common/Pkcs5.c
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@ -171,8 +171,14 @@ static void derive_u_sha256 (char *salt, int salt_len, uint32 iterations, int b,
memcpy (k, salt, salt_len); /* salt */
/* big-endian block number */
#ifdef TC_WINDOWS_BOOT
/* specific case of 16-bit bootloader: b is a 16-bit integer that is always < 256 */
memset (&k[salt_len], 0, 3);
k[salt_len + 3] = (char) b;
#else
b = bswap_32 (b);
memcpy (&k[salt_len], &b, 4);
#endif
hmac_sha256_internal (k, salt_len + 4, hmac);
memcpy (u, k, SHA256_DIGESTSIZE);
@ -377,8 +383,8 @@ static void derive_u_sha512 (char *salt, int salt_len, uint32 iterations, int b,
/* iteration 1 */
memcpy (k, salt, salt_len); /* salt */
/* big-endian block number */
memset (&k[salt_len], 0, 3);
k[salt_len + 3] = (char) b;
b = bswap_32 (b);
memcpy (&k[salt_len], &b, 4);
hmac_sha512_internal (k, salt_len + 4, hmac);
memcpy (u, k, SHA512_DIGESTSIZE);
@ -587,8 +593,14 @@ static void derive_u_ripemd160 (char *salt, int salt_len, uint32 iterations, int
memcpy (k, salt, salt_len); /* salt */
/* big-endian block number */
#ifdef TC_WINDOWS_BOOT
/* specific case of 16-bit bootloader: b is a 16-bit integer that is always < 256*/
memset (&k[salt_len], 0, 3);
k[salt_len + 3] = (char) b;
#else
b = bswap_32 (b);
memcpy (&k[salt_len], &b, 4);
#endif
hmac_ripemd160_internal (k, salt_len + 4, hmac);
memcpy (u, k, RIPEMD160_DIGESTSIZE);
@ -800,8 +812,8 @@ static void derive_u_whirlpool (char *salt, int salt_len, uint32 iterations, int
/* iteration 1 */
memcpy (k, salt, salt_len); /* salt */
/* big-endian block number */
memset (&k[salt_len], 0, 3);
k[salt_len + 3] = (char) b;
b = bswap_32 (b);
memcpy (&k[salt_len], &b, 4);
hmac_whirlpool_internal (k, salt_len + 4, hmac);
memcpy (u, k, WHIRLPOOL_DIGESTSIZE);
@ -1015,8 +1027,8 @@ static void derive_u_streebog (char *salt, int salt_len, uint32 iterations, int
/* iteration 1 */
memcpy (k, salt, salt_len); /* salt */
/* big-endian block number */
memset (&k[salt_len], 0, 3);
k[salt_len + 3] = (char) b;
b = bswap_32 (b);
memcpy (&k[salt_len], &b, 4);
hmac_streebog_internal (k, salt_len + 4, hmac);
memcpy (u, k, STREEBOG_DIGESTSIZE);

1
src/Crypto/misc.h
View File

@ -85,6 +85,7 @@
#define CRYPTOPP_BYTESWAP_AVAILABLE
#include <byteswap.h>
#elif defined(_MSC_VER) && _MSC_VER >= 1300 && !defined(_UEFI)
#pragma intrinsic(_byteswap_ulong,_byteswap_uint64)
#define CRYPTOPP_BYTESWAP_AVAILABLE
#define bswap_32(x) _byteswap_ulong(x)
#define bswap_64(x) _byteswap_uint64(x)