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add PBKDF2

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This commit is contained in:
Todd A Ouska
2011-03-28 17:15:14 -07:00
parent 249935d59b
commit 50c8faf7a1
3 changed files with 87 additions and 1 deletions
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76
ctaocrypt/src/pwdbased.c
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@@ -23,6 +23,26 @@
#ifndef NO_PWDBASED
#include "pwdbased.h"
#include "ctc_hmac.h"
#ifdef CYASSL_SHA512
#include "sha512.h"
#endif
#ifdef NO_INLINE
#include "misc.h"
#else
#include "misc.c"
#endif
#ifndef min
static INLINE word32 min(word32 a, word32 b)
{
return a > b ? b : a;
}
#endif /* min */
int PBKDF1(byte* output, const byte* passwd, int pLen, const byte* salt,
@@ -72,5 +92,61 @@ int PBKDF1(byte* output, const byte* passwd, int pLen, const byte* salt,
}
int PBKDF2(byte* output, const byte* passwd, int pLen, const byte* salt,
int sLen, int iterations, int kLen, int hashType)
{
word32 i = 1;
int hLen;
int j;
Hmac hmac;
byte buffer[INNER_HASH_SIZE]; /* max size */
if (hashType == MD5) {
hLen = MD5_DIGEST_SIZE;
}
else if (hashType == SHA) {
hLen = SHA_DIGEST_SIZE;
}
else if (hashType == SHA256) {
hLen = SHA256_DIGEST_SIZE;
}
#ifdef CYASSL_SHA512
else if (hashType == SHA512) {
hLen = SHA512_DIGEST_SIZE;
}
#endif
else
return -1; /* bad HMAC hashType */
HmacSetKey(&hmac, hashType, passwd, pLen);
while (kLen) {
int currentLen;
HmacUpdate(&hmac, salt, sLen);
/* encode i */
for (j = 0; j < 4; j++) {
byte b = i >> ((3-j) * 8);
HmacUpdate(&hmac, &b, 1);
}
HmacFinal(&hmac, buffer);
currentLen = min(kLen, hLen);
XMEMCPY(output, buffer, currentLen);
for (j = 1; j < iterations; j++) {
HmacUpdate(&hmac, buffer, hLen);
HmacFinal(&hmac, buffer);
xorbuf(output, buffer, currentLen);
}
output += currentLen;
kLen -= currentLen;
i++;
}
return 0;
}
#endif /* NO_PWDBASED */