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2754597013
I have tried to convert 'len' type variable declarations to unsigned as a means to address these warnings when appropriate, but when in doubt I have used casts in the comparisons instead. The better solution (that would get us all lynched by API users) would be to go through and convert all the function prototypes and structure definitions to use unsigned variables except when signed is necessary. The proliferation of (signed) "int" for strictly non-negative uses is unfortunate.
253 lines
8.1 KiB
C
253 lines
8.1 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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#include <stdio.h>
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#include <stdlib.h>
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#include "cryptlib.h"
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#if !defined(OPENSSL_NO_HMAC) && !defined(OPENSSL_NO_SHA)
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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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/* 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_ex(&hctx, pass, passlen, EVP_sha1(), NULL);
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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, iter, plen;
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unsigned int keylen;
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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_ex(ctx, cipher, NULL, 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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OPENSSL_assert(keylen <= sizeof key);
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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) != (int)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_ex(ctx, NULL, NULL, key, NULL, en_de);
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OPENSSL_cleanse(key, 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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