p5_crpt.c revision 296341
1/* p5_crpt.c */ 2/* 3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project 4 * 1999. 5 */ 6/* ==================================================================== 7 * Copyright (c) 1999 The OpenSSL Project. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. All advertising materials mentioning features or use of this 22 * software must display the following acknowledgment: 23 * "This product includes software developed by the OpenSSL Project 24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 25 * 26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 27 * endorse or promote products derived from this software without 28 * prior written permission. For written permission, please contact 29 * licensing@OpenSSL.org. 30 * 31 * 5. Products derived from this software may not be called "OpenSSL" 32 * nor may "OpenSSL" appear in their names without prior written 33 * permission of the OpenSSL Project. 34 * 35 * 6. Redistributions of any form whatsoever must retain the following 36 * acknowledgment: 37 * "This product includes software developed by the OpenSSL Project 38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 51 * OF THE POSSIBILITY OF SUCH DAMAGE. 52 * ==================================================================== 53 * 54 * This product includes cryptographic software written by Eric Young 55 * (eay@cryptsoft.com). This product includes software written by Tim 56 * Hudson (tjh@cryptsoft.com). 57 * 58 */ 59 60#include <stdio.h> 61#include <stdlib.h> 62#include "cryptlib.h" 63#include <openssl/x509.h> 64#include <openssl/evp.h> 65 66/* 67 * Doesn't do anything now: Builtin PBE algorithms in static table. 68 */ 69 70void PKCS5_PBE_add(void) 71{ 72} 73 74int PKCS5_PBE_keyivgen(EVP_CIPHER_CTX *cctx, const char *pass, int passlen, 75 ASN1_TYPE *param, const EVP_CIPHER *cipher, 76 const EVP_MD *md, int en_de) 77{ 78 EVP_MD_CTX ctx; 79 unsigned char md_tmp[EVP_MAX_MD_SIZE]; 80 unsigned char key[EVP_MAX_KEY_LENGTH], iv[EVP_MAX_IV_LENGTH]; 81 int i; 82 PBEPARAM *pbe; 83 int saltlen, iter; 84 unsigned char *salt; 85 const unsigned char *pbuf; 86 int mdsize; 87 int rv = 0; 88 EVP_MD_CTX_init(&ctx); 89 90 /* Extract useful info from parameter */ 91 if (param == NULL || param->type != V_ASN1_SEQUENCE || 92 param->value.sequence == NULL) { 93 EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN, EVP_R_DECODE_ERROR); 94 return 0; 95 } 96 97 pbuf = param->value.sequence->data; 98 if (!(pbe = d2i_PBEPARAM(NULL, &pbuf, param->value.sequence->length))) { 99 EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN, EVP_R_DECODE_ERROR); 100 return 0; 101 } 102 103 if (!pbe->iter) 104 iter = 1; 105 else 106 iter = ASN1_INTEGER_get(pbe->iter); 107 salt = pbe->salt->data; 108 saltlen = pbe->salt->length; 109 110 if (!pass) 111 passlen = 0; 112 else if (passlen == -1) 113 passlen = strlen(pass); 114 115 if (!EVP_DigestInit_ex(&ctx, md, NULL)) 116 goto err; 117 if (!EVP_DigestUpdate(&ctx, pass, passlen)) 118 goto err; 119 if (!EVP_DigestUpdate(&ctx, salt, saltlen)) 120 goto err; 121 PBEPARAM_free(pbe); 122 if (!EVP_DigestFinal_ex(&ctx, md_tmp, NULL)) 123 goto err; 124 mdsize = EVP_MD_size(md); 125 if (mdsize < 0) 126 return 0; 127 for (i = 1; i < iter; i++) { 128 if (!EVP_DigestInit_ex(&ctx, md, NULL)) 129 goto err; 130 if (!EVP_DigestUpdate(&ctx, md_tmp, mdsize)) 131 goto err; 132 if (!EVP_DigestFinal_ex(&ctx, md_tmp, NULL)) 133 goto err; 134 } 135 OPENSSL_assert(EVP_CIPHER_key_length(cipher) <= (int)sizeof(md_tmp)); 136 memcpy(key, md_tmp, EVP_CIPHER_key_length(cipher)); 137 OPENSSL_assert(EVP_CIPHER_iv_length(cipher) <= 16); 138 memcpy(iv, md_tmp + (16 - EVP_CIPHER_iv_length(cipher)), 139 EVP_CIPHER_iv_length(cipher)); 140 if (!EVP_CipherInit_ex(cctx, cipher, NULL, key, iv, en_de)) 141 goto err; 142 OPENSSL_cleanse(md_tmp, EVP_MAX_MD_SIZE); 143 OPENSSL_cleanse(key, EVP_MAX_KEY_LENGTH); 144 OPENSSL_cleanse(iv, EVP_MAX_IV_LENGTH); 145 rv = 1; 146 err: 147 EVP_MD_CTX_cleanup(&ctx); 148 return rv; 149} 150