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PBKDF2 should be efficient. Contributed by Christian Heimes

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<christian@python.org>.
This commit is contained in:
Ben Laurie 2013-11-03 17:23:50 +00:00
parent d519f0831c
commit c10e3f0cff
1 changed files with 29 additions and 8 deletions
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37
crypto/evp/p5_crpt2.c
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@ -85,7 +85,7 @@ int PKCS5_PBKDF2_HMAC(const char *pass, int passlen,
unsigned char digtmp[EVP_MAX_MD_SIZE], *p, itmp[4];
int cplen, j, k, tkeylen, mdlen;
unsigned long i = 1;
HMAC_CTX hctx;
HMAC_CTX hctx_tpl, hctx;
mdlen = EVP_MD_size(digest);
if (mdlen < 0)
@ -98,6 +98,11 @@ int PKCS5_PBKDF2_HMAC(const char *pass, int passlen,
passlen = 0;
else if(passlen == -1)
passlen = strlen(pass);
if (!HMAC_Init_ex(&hctx_tpl, pass, passlen, digest, NULL))
{
HMAC_CTX_cleanup(&hctx_tpl);
return 0;
}
while(tkeylen)
{
if(tkeylen > mdlen)
@ -111,19 +116,35 @@ int PKCS5_PBKDF2_HMAC(const char *pass, int passlen,
itmp[1] = (unsigned char)((i >> 16) & 0xff);
itmp[2] = (unsigned char)((i >> 8) & 0xff);
itmp[3] = (unsigned char)(i & 0xff);
if (!HMAC_Init_ex(&hctx, pass, passlen, digest, NULL)
|| !HMAC_Update(&hctx, salt, saltlen)
|| !HMAC_Update(&hctx, itmp, 4)
|| !HMAC_Final(&hctx, digtmp, NULL))
if (!HMAC_CTX_copy(&hctx, &hctx_tpl))
{
HMAC_CTX_cleanup(&hctx_tpl);
return 0;
}
if (!HMAC_Update(&hctx, salt, saltlen)
|| !HMAC_Update(&hctx, itmp, 4)
|| !HMAC_Final(&hctx, digtmp, NULL))
{
HMAC_CTX_cleanup(&hctx_tpl);
HMAC_CTX_cleanup(&hctx);
return 0;
}
memcpy(p, digtmp, cplen);
for(j = 1; j < iter; j++)
{
HMAC(digest, pass, passlen,
digtmp, mdlen, digtmp, NULL);
if (!HMAC_CTX_copy(&hctx, &hctx_tpl))
{
HMAC_CTX_cleanup(&hctx_tpl);
return 0;
}
if (!HMAC_Update(&hctx, digtmp, mdlen)
|| !HMAC_Final(&hctx, digtmp, NULL))
{
HMAC_CTX_cleanup(&hctx_tpl);
HMAC_CTX_cleanup(&hctx);
return 0;
}
HMAC_CTX_cleanup(&hctx);
for(k = 0; k < cplen; k++)
p[k] ^= digtmp[k];
}
@ -131,7 +152,7 @@ int PKCS5_PBKDF2_HMAC(const char *pass, int passlen,
i++;
p+= cplen;
}
HMAC_CTX_cleanup(&hctx);
HMAC_CTX_cleanup(&hctx_tpl);
#ifdef DEBUG_PKCS5V2
fprintf(stderr, "Password:\n");
h__dump (pass, passlen);