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crypto_memcmp

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This commit is contained in:
Vladimir 'phcoder' Serbinenko 2009-11-15 23:31:27 +01:00
parent 6e7d9194d1
commit 10e53efaee
2 changed files with 21 additions and 0 deletions
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6
include/grub/crypto.h
View file

@ -242,8 +242,11 @@ grub_crypto_hmac_buffer (const struct gcry_md_spec *md,
void *data, grub_size_t datalen, void *out);
extern gcry_md_spec_t _gcry_digest_spec_md5;
extern gcry_md_spec_t _gcry_digest_spec_sha1;
extern gcry_md_spec_t _gcry_digest_spec_sha256;
#define GRUB_MD_MD5 ((const gcry_md_spec_t *) &_gcry_digest_spec_md5)
#define GRUB_MD_SHA1 ((const gcry_md_spec_t *) &_gcry_digest_spec_sha1)
#define GRUB_MD_SHA256 ((const gcry_md_spec_t *) &_gcry_digest_spec_sha256)
/* Implement PKCS#5 PBKDF2 as per RFC 2898. The PRF to use is HMAC variant
of digest supplied by MD. Inputs are the password P of length PLEN,
@ -258,4 +261,7 @@ grub_crypto_pbkdf2 (const struct gcry_md_spec *md,
unsigned int c,
grub_uint8_t *DK, grub_size_t dkLen);
int
grub_crypto_memcmp (void *a, void *b, grub_size_t n);
#endif

15
lib/crypto.c
View file

@ -370,3 +370,18 @@ grub_crypto_gcry_error (gcry_err_code_t in)
return GRUB_ERR_NONE;
return GRUB_ACCESS_DENIED;
}
int
grub_crypto_memcmp (void *a, void *b, grub_size_t n)
{
register grub_size_t counter = 0;
grub_uint8_t *pa, *pb;
for (pa = a, pb = b; n; pa++, pb++, n--)
{
if (*pa != *pb)
counter++;
}
return !!counter;
}