* Hudson (tjh@cryptsoft.com).
*
*/
+#if !defined(NO_HMAC) && !defined(NO_SHA)
#include <stdio.h>
#include <stdlib.h>
#include <openssl/x509.h>
#include <openssl/hmac.h>
#include "cryptlib.h"
+/* set this to print out info about the keygen algorithm */
+/* #define DEBUG_PKCS5V2 */
+
+#ifdef DEBUG_PKCS5V2
+ static void h__dump (const unsigned char *p, int len);
+#endif
+
/* This is an implementation of PKCS#5 v2.0 password based encryption key
* derivation function PBKDF2 using the only currently defined function HMAC
* with SHA1. Verified against test vectors posted by Peter Gutmann
*/
int PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen,
- unsigned char *salt, int saltlen, int iter,
- int keylen, unsigned char *out)
+ unsigned char *salt, int saltlen, int iter,
+ int keylen, unsigned char *out)
{
unsigned char digtmp[SHA_DIGEST_LENGTH], *p, itmp[4];
- int cplen, j, k;
+ int cplen, j, k, tkeylen;
unsigned long i = 1;
HMAC_CTX hctx;
p = out;
- if(passlen == -1) passlen = strlen(pass);
- while(keylen) {
- if(keylen > SHA_DIGEST_LENGTH) cplen = SHA_DIGEST_LENGTH;
- else cplen = keylen;
+ tkeylen = keylen;
+ if(!pass) passlen = 0;
+ else if(passlen == -1) passlen = strlen(pass);
+ while(tkeylen) {
+ if(tkeylen > SHA_DIGEST_LENGTH) cplen = SHA_DIGEST_LENGTH;
+ else cplen = tkeylen;
/* We are unlikely to ever use more than 256 blocks (5120 bits!)
* but just in case...
*/
- itmp[0] = (i >> 24) & 0xff;
- itmp[1] = (i >> 16) & 0xff;
- itmp[2] = (i >> 8) & 0xff;
- itmp[3] = i & 0xff;
+ itmp[0] = (unsigned char)((i >> 24) & 0xff);
+ itmp[1] = (unsigned char)((i >> 16) & 0xff);
+ itmp[2] = (unsigned char)((i >> 8) & 0xff);
+ itmp[3] = (unsigned char)(i & 0xff);
HMAC_Init(&hctx, pass, passlen, EVP_sha1());
HMAC_Update(&hctx, salt, saltlen);
HMAC_Update(&hctx, itmp, 4);
digtmp, SHA_DIGEST_LENGTH, digtmp, NULL);
for(k = 0; k < cplen; k++) p[k] ^= digtmp[k];
}
- keylen-= cplen;
+ tkeylen-= cplen;
i++;
p+= cplen;
}
HMAC_cleanup(&hctx);
+#ifdef DEBUG_PKCS5V2
+ fprintf(stderr, "Password:\n");
+ h__dump (pass, passlen);
+ fprintf(stderr, "Salt:\n");
+ h__dump (salt, saltlen);
+ fprintf(stderr, "Iteration count %d\n", iter);
+ fprintf(stderr, "Key:\n");
+ h__dump (out, keylen);
+#endif
return 1;
}
return 0;
}
+#ifdef DEBUG_PKCS5V2
+static void h__dump (const unsigned char *p, int len)
+{
+ for (; len --; p++) fprintf(stderr, "%02X ", *p);
+ fprintf(stderr, "\n");
+}
+#endif
+#endif