250 lines
8 KiB
C
250 lines
8 KiB
C
/* p5_crpt2.c */
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/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
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* project 1999.
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*/
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/* ====================================================================
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* Copyright (c) 1999 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#if !defined(OPENSSL_NO_HMAC) && !defined(OPENSSL_NO_SHA)
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#include <stdio.h>
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#include <stdlib.h>
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#include <openssl/x509.h>
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#include <openssl/evp.h>
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#include <openssl/hmac.h>
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#include "cryptlib.h"
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/* set this to print out info about the keygen algorithm */
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/* #define DEBUG_PKCS5V2 */
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#ifdef DEBUG_PKCS5V2
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static void h__dump (const unsigned char *p, int len);
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#endif
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/* This is an implementation of PKCS#5 v2.0 password based encryption key
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* derivation function PBKDF2 using the only currently defined function HMAC
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* with SHA1. Verified against test vectors posted by Peter Gutmann
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* <pgut001@cs.auckland.ac.nz> to the PKCS-TNG <pkcs-tng@rsa.com> mailing list.
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*/
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int PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen,
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unsigned char *salt, int saltlen, int iter,
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int keylen, unsigned char *out)
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{
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unsigned char digtmp[SHA_DIGEST_LENGTH], *p, itmp[4];
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int cplen, j, k, tkeylen;
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unsigned long i = 1;
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HMAC_CTX hctx;
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HMAC_CTX_init(&hctx);
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p = out;
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tkeylen = keylen;
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if(!pass) passlen = 0;
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else if(passlen == -1) passlen = strlen(pass);
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while(tkeylen) {
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if(tkeylen > SHA_DIGEST_LENGTH) cplen = SHA_DIGEST_LENGTH;
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else cplen = tkeylen;
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/* We are unlikely to ever use more than 256 blocks (5120 bits!)
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* but just in case...
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*/
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itmp[0] = (unsigned char)((i >> 24) & 0xff);
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itmp[1] = (unsigned char)((i >> 16) & 0xff);
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itmp[2] = (unsigned char)((i >> 8) & 0xff);
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itmp[3] = (unsigned char)(i & 0xff);
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HMAC_Init(&hctx, pass, passlen, EVP_sha1());
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HMAC_Update(&hctx, salt, saltlen);
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HMAC_Update(&hctx, itmp, 4);
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HMAC_Final(&hctx, digtmp, NULL);
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memcpy(p, digtmp, cplen);
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for(j = 1; j < iter; j++) {
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HMAC(EVP_sha1(), pass, passlen,
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digtmp, SHA_DIGEST_LENGTH, digtmp, NULL);
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for(k = 0; k < cplen; k++) p[k] ^= digtmp[k];
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}
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tkeylen-= cplen;
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i++;
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p+= cplen;
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}
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HMAC_CTX_cleanup(&hctx);
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#ifdef DEBUG_PKCS5V2
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fprintf(stderr, "Password:\n");
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h__dump (pass, passlen);
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fprintf(stderr, "Salt:\n");
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h__dump (salt, saltlen);
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fprintf(stderr, "Iteration count %d\n", iter);
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fprintf(stderr, "Key:\n");
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h__dump (out, keylen);
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#endif
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return 1;
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}
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#ifdef DO_TEST
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main()
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{
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unsigned char out[4];
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unsigned char salt[] = {0x12, 0x34, 0x56, 0x78};
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PKCS5_PBKDF2_HMAC_SHA1("password", -1, salt, 4, 5, 4, out);
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fprintf(stderr, "Out %02X %02X %02X %02X\n",
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out[0], out[1], out[2], out[3]);
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}
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#endif
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/* Now the key derivation function itself. This is a bit evil because
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* it has to check the ASN1 parameters are valid: and there are quite a
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* few of them...
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*/
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int PKCS5_v2_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
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ASN1_TYPE *param, const EVP_CIPHER *c, const EVP_MD *md,
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int en_de)
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{
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unsigned char *pbuf, *salt, key[EVP_MAX_KEY_LENGTH];
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int saltlen, keylen, iter, plen;
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PBE2PARAM *pbe2 = NULL;
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const EVP_CIPHER *cipher;
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PBKDF2PARAM *kdf = NULL;
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pbuf = param->value.sequence->data;
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plen = param->value.sequence->length;
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if(!param || (param->type != V_ASN1_SEQUENCE) ||
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!(pbe2 = d2i_PBE2PARAM(NULL, &pbuf, plen))) {
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EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
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return 0;
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}
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/* See if we recognise the key derivation function */
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if(OBJ_obj2nid(pbe2->keyfunc->algorithm) != NID_id_pbkdf2) {
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EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
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EVP_R_UNSUPPORTED_KEY_DERIVATION_FUNCTION);
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goto err;
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}
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/* lets see if we recognise the encryption algorithm.
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*/
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cipher = EVP_get_cipherbyname(
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OBJ_nid2sn(OBJ_obj2nid(pbe2->encryption->algorithm)));
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if(!cipher) {
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EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
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EVP_R_UNSUPPORTED_CIPHER);
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goto err;
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}
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/* Fixup cipher based on AlgorithmIdentifier */
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EVP_CipherInit(ctx, cipher, NULL, NULL, en_de);
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if(EVP_CIPHER_asn1_to_param(ctx, pbe2->encryption->parameter) < 0) {
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EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
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EVP_R_CIPHER_PARAMETER_ERROR);
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goto err;
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}
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keylen = EVP_CIPHER_CTX_key_length(ctx);
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/* Now decode key derivation function */
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pbuf = pbe2->keyfunc->parameter->value.sequence->data;
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plen = pbe2->keyfunc->parameter->value.sequence->length;
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if(!pbe2->keyfunc->parameter ||
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(pbe2->keyfunc->parameter->type != V_ASN1_SEQUENCE) ||
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!(kdf = d2i_PBKDF2PARAM(NULL, &pbuf, plen)) ) {
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EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
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goto err;
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}
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PBE2PARAM_free(pbe2);
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pbe2 = NULL;
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/* Now check the parameters of the kdf */
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if(kdf->keylength && (ASN1_INTEGER_get(kdf->keylength) != keylen)){
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EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
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EVP_R_UNSUPPORTED_KEYLENGTH);
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goto err;
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}
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if(kdf->prf && (OBJ_obj2nid(kdf->prf->algorithm) != NID_hmacWithSHA1)) {
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EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
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goto err;
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}
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if(kdf->salt->type != V_ASN1_OCTET_STRING) {
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EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
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EVP_R_UNSUPPORTED_SALT_TYPE);
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goto err;
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}
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/* it seems that its all OK */
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salt = kdf->salt->value.octet_string->data;
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saltlen = kdf->salt->value.octet_string->length;
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iter = ASN1_INTEGER_get(kdf->iter);
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PKCS5_PBKDF2_HMAC_SHA1(pass, passlen, salt, saltlen, iter, keylen, key);
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EVP_CipherInit(ctx, NULL, key, NULL, en_de);
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memset(key, 0, keylen);
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PBKDF2PARAM_free(kdf);
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return 1;
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err:
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PBE2PARAM_free(pbe2);
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PBKDF2PARAM_free(kdf);
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return 0;
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}
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#ifdef DEBUG_PKCS5V2
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static void h__dump (const unsigned char *p, int len)
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{
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for (; len --; p++) fprintf(stderr, "%02X ", *p);
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fprintf(stderr, "\n");
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}
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#endif
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#endif
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