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/* LibTomCrypt, modular cryptographic library -- Tom St Denis
*
* LibTomCrypt is a library that provides various cryptographic
* algorithms in a highly modular and flexible manner.
*
* The library is free for all purposes without any express
* guarantee it works.
*
* Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org
*/
#include <tomcrypt.h>
/**
@file pkcs_5_1.c
PKCS #5, Algorithm #1, Tom St Denis
*/
#ifdef PKCS_5
/**
Execute PKCS #5 v1
@param password The password (or key)
@param password_len The length of the password (octet)
@param salt The salt (or nonce) which is 8 octets long
@param iteration_count The PKCS #5 v1 iteration count
@param hash_idx The index of the hash desired
@param out [out] The destination for this algorithm
@param outlen [in/out] The max size and resulting size of the algorithm output
@return CRYPT_OK if successful
*/
int pkcs_5_alg1(const unsigned char *password, unsigned long password_len,
const unsigned char *salt,
int iteration_count, int hash_idx,
unsigned char *out, unsigned long *outlen)
{
int err;
unsigned long x;
hash_state *md;
unsigned char *buf;
LTC_ARGCHK(password != NULL);
LTC_ARGCHK(salt != NULL);
LTC_ARGCHK(out != NULL);
LTC_ARGCHK(outlen != NULL);
/* test hash IDX */
if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
return err;
}
/* allocate memory */
md = XMALLOC(sizeof(hash_state));
buf = XMALLOC(MAXBLOCKSIZE);
if (md == NULL || buf == NULL) {
if (md != NULL) {
XFREE(md);
}
if (buf != NULL) {
XFREE(buf);
}
return CRYPT_MEM;
}
/* hash initial password + salt */
if ((err = hash_descriptor[hash_idx].init(md)) != CRYPT_OK) {
goto LBL_ERR;
}
if ((err = hash_descriptor[hash_idx].process(md, password, password_len)) != CRYPT_OK) {
goto LBL_ERR;
}
if ((err = hash_descriptor[hash_idx].process(md, salt, 8)) != CRYPT_OK) {
goto LBL_ERR;
}
if ((err = hash_descriptor[hash_idx].done(md, buf)) != CRYPT_OK) {
goto LBL_ERR;
}
while (--iteration_count) {
/* code goes here. */
x = MAXBLOCKSIZE;
if ((err = hash_memory(hash_idx, buf, hash_descriptor[hash_idx].hashsize, buf, &x)) != CRYPT_OK) {
goto LBL_ERR;
}
}
/* copy upto outlen bytes */
for (x = 0; x < hash_descriptor[hash_idx].hashsize && x < *outlen; x++) {
out[x] = buf[x];
}
*outlen = x;
err = CRYPT_OK;
LBL_ERR:
#ifdef LTC_CLEAN_STACK
zeromem(buf, MAXBLOCKSIZE);
zeromem(md, sizeof(hash_state));
#endif
XFREE(buf);
XFREE(md);
return err;
}
#endif
/* $Source: /cvs/libtom/libtomcrypt/src/misc/pkcs5/pkcs_5_1.c,v $ */
/* $Revision: 1.4 $ */
/* $Date: 2005/05/05 14:35:59 $ */
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