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/* p5_crpt2.c */
/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
* project 1999.
*/
/* ====================================================================
* Copyright (c) 1999 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* licensing@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
#if !defined(NO_HMAC) && !defined(NO_SHA)
#include <stdio.h>
#include <stdlib.h>
#include <openssl/x509.h>
#include <openssl/evp.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
* <pgut001@cs.auckland.ac.nz> to the PKCS-TNG <pkcs-tng@rsa.com> mailing list.
*/
int PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen,
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, tkeylen;
unsigned long i = 1;
HMAC_CTX hctx;
p = out;
tkeylen = keylen;
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] = (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);
HMAC_Final(&hctx, digtmp, NULL);
memcpy(p, digtmp, cplen);
for(j = 1; j < iter; j++) {
HMAC(EVP_sha1(), pass, passlen,
digtmp, SHA_DIGEST_LENGTH, digtmp, NULL);
for(k = 0; k < cplen; k++) p[k] ^= digtmp[k];
}
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;
}
#ifdef DO_TEST
main()
{
unsigned char out[4];
unsigned char salt[] = {0x12, 0x34, 0x56, 0x78};
PKCS5_PBKDF2_HMAC_SHA1("password", -1, salt, 4, 5, 4, out);
fprintf(stderr, "Out %02X %02X %02X %02X\n",
out[0], out[1], out[2], out[3]);
}
#endif
/* Now the key derivation function itself. This is a bit evil because
* it has to check the ASN1 parameters are valid: and there are quite a
* few of them...
*/
int PKCS5_v2_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
ASN1_TYPE *param, EVP_CIPHER *c, EVP_MD *md,
int en_de)
{
unsigned char *pbuf, *salt, key[EVP_MAX_KEY_LENGTH];
int saltlen, keylen, iter, plen;
PBE2PARAM *pbe2 = NULL;
const EVP_CIPHER *cipher;
PBKDF2PARAM *kdf = NULL;
pbuf = param->value.sequence->data;
plen = param->value.sequence->length;
if(!param || (param->type != V_ASN1_SEQUENCE) ||
!(pbe2 = d2i_PBE2PARAM(NULL, &pbuf, plen))) {
EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
return 0;
}
/* See if we recognise the key derivation function */
if(OBJ_obj2nid(pbe2->keyfunc->algorithm) != NID_id_pbkdf2) {
EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
EVP_R_UNSUPPORTED_KEY_DERIVATION_FUNCTION);
goto err;
}
/* lets see if we recognise the encryption algorithm.
*/
cipher = EVP_get_cipherbyname(
OBJ_nid2sn(OBJ_obj2nid(pbe2->encryption->algorithm)));
if(!cipher) {
EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
EVP_R_UNSUPPORTED_CIPHER);
goto err;
}
/* Fixup cipher based on AlgorithmIdentifier */
EVP_CipherInit(ctx, cipher, NULL, NULL, en_de);
if(EVP_CIPHER_asn1_to_param(ctx, pbe2->encryption->parameter) < 0) {
EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
EVP_R_CIPHER_PARAMETER_ERROR);
goto err;
}
keylen = EVP_CIPHER_CTX_key_length(ctx);
/* Now decode key derivation function */
pbuf = pbe2->keyfunc->parameter->value.sequence->data;
plen = pbe2->keyfunc->parameter->value.sequence->length;
if(!pbe2->keyfunc->parameter ||
(pbe2->keyfunc->parameter->type != V_ASN1_SEQUENCE) ||
!(kdf = d2i_PBKDF2PARAM(NULL, &pbuf, plen)) ) {
EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
goto err;
}
PBE2PARAM_free(pbe2);
pbe2 = NULL;
/* Now check the parameters of the kdf */
if(kdf->keylength && (ASN1_INTEGER_get(kdf->keylength) != keylen)){
EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
EVP_R_UNSUPPORTED_KEYLENGTH);
goto err;
}
if(kdf->prf && (OBJ_obj2nid(kdf->prf->algorithm) != NID_hmacWithSHA1)) {
EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
goto err;
}
if(kdf->salt->type != V_ASN1_OCTET_STRING) {
EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
EVP_R_UNSUPPORTED_SALT_TYPE);
goto err;
}
/* it seems that its all OK */
salt = kdf->salt->value.octet_string->data;
saltlen = kdf->salt->value.octet_string->length;
iter = ASN1_INTEGER_get(kdf->iter);
PKCS5_PBKDF2_HMAC_SHA1(pass, passlen, salt, saltlen, iter, keylen, key);
EVP_CipherInit(ctx, NULL, key, NULL, en_de);
memset(key, 0, keylen);
PBKDF2PARAM_free(kdf);
return 1;
err:
PBE2PARAM_free(pbe2);
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
#endif
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