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Add a debugging option to PKCS#5 v2.0 key generation function.

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This commit is contained in:
Dr. Stephen Henson 1999-07-11 12:40:46 +00:00
parent 0ab8beb480
commit f513939ebb
2 changed files with 35 additions and 6 deletions
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5
CHANGES
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@ -4,6 +4,11 @@
Changes between 0.9.3a and 0.9.4
*) Add a debugging option to PKCS#5 v2 key generation function: when
you #define DEBUG_PKCS5V2 passwords, salts, iteration counts and
derived keys are printed to stderr.
[Steve Henson]
*) Copy the flags in ASN1_STRING_dup().
[Roman E. Pavlov <pre@mo.msk.ru>]

36
crypto/evp/p5_crpt2.c
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@ -55,7 +55,6 @@
* Hudson (tjh@cryptsoft.com).
*
*/
#if !defined(NO_HMAC) && !defined(NO_SHA)
#include <stdio.h>
#include <stdlib.h>
#include <openssl/x509.h>
@ -63,6 +62,13 @@
#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
@ -74,14 +80,15 @@ int PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen,
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;
tkeylen = keylen;
if(passlen == -1) passlen = strlen(pass);
while(keylen) {
if(keylen > SHA_DIGEST_LENGTH) cplen = SHA_DIGEST_LENGTH;
else cplen = keylen;
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...
*/
@ -99,11 +106,20 @@ int PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen,
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;
}
@ -219,4 +235,12 @@ int PKCS5_v2_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
PBKDF2PARAM_free(kdf);
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