Problem - Kevin Tafuro

#include
#include
#include
#include /* for htonl */
#ifdef WIN32
typedef unsigned __int64 spc_uint64_t;
#else
typedef unsigned long long spc_uint64_t;
#endif
/* This value needs to be the output size of your pseudo-random function (PRF)! */
#define PRF_OUT_LEN 20
/* This is an implementation of the PKCS#5 PBKDF2 PRF using HMAC-SHA1. It
* always gives 20-byte outputs.
*/
/* The first three functions are internal helper functions. */
static void pkcs5_initial_prf(unsigned char *p, size_t plen, unsigned char *salt,
size_t saltlen, size_t i, unsigned char *out,
size_t *outlen) {
size_t swapped_i;
HMAC_CTX ctx;
HMAC_CTX_init(&ctx);
HMAC_Init(&ctx, p, plen, EVP_sha1( ));
HMAC_Update(&ctx, salt, saltlen);
swapped_i = htonl(i);
HMAC_Update(&ctx, (unsigned char *)&swapped_i, 4);
HMAC_Final(&ctx, out, (unsigned int *)outlen);
}
/* The PRF doesn't *really* change in subsequent calls, but above we handled the
* concatenation of the salt and i within the function, instead of external to it,
* because the implementation is easier that way.
*/
static void pkcs5_subsequent_prf(unsigned char *p, size_t plen, unsigned char *v,
size_t vlen, unsigned char *o, size_t *olen) {
HMAC_CTX ctx;
HMAC_CTX_init(&ctx);
HMAC_Init(&ctx, p, plen, EVP_sha1( ));
HMAC_Update(&ctx, v, vlen);
HMAC_Final(&ctx, o, (unsigned int *)olen);
}
static void pkcs5_F(unsigned char *p, size_t plen, unsigned char *salt,
size_t saltlen, size_t ic, size_t bix, unsigned char *out) {
size_t i = 1, j, outlen;
unsigned char ulast[PRF_OUT_LEN];
memset(out,0, PRF_OUT_LEN);
pkcs5_initial_prf(p, plen, salt, saltlen, bix, ulast, &outlen);
while (i++