1 /* $OpenBSD: p5_crpt.c,v 1.20 2021/12/12 21:30:13 tb Exp $ */ 2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL 3 * project 1999. 4 */ 5 /* ==================================================================== 6 * Copyright (c) 1999 The OpenSSL Project. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 20 * 3. All advertising materials mentioning features or use of this 21 * software must display the following acknowledgment: 22 * "This product includes software developed by the OpenSSL Project 23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 24 * 25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 26 * endorse or promote products derived from this software without 27 * prior written permission. For written permission, please contact 28 * licensing@OpenSSL.org. 29 * 30 * 5. Products derived from this software may not be called "OpenSSL" 31 * nor may "OpenSSL" appear in their names without prior written 32 * permission of the OpenSSL Project. 33 * 34 * 6. Redistributions of any form whatsoever must retain the following 35 * acknowledgment: 36 * "This product includes software developed by the OpenSSL Project 37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 38 * 39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50 * OF THE POSSIBILITY OF SUCH DAMAGE. 51 * ==================================================================== 52 * 53 * This product includes cryptographic software written by Eric Young 54 * (eay@cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh@cryptsoft.com). 56 * 57 */ 58 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 63 #include <openssl/err.h> 64 #include <openssl/evp.h> 65 #include <openssl/x509.h> 66 67 #include "evp_locl.h" 68 69 /* Doesn't do anything now: Builtin PBE algorithms in static table. 70 */ 71 72 void 73 PKCS5_PBE_add(void) 74 { 75 } 76 77 int 78 PKCS5_PBE_keyivgen(EVP_CIPHER_CTX *cctx, const char *pass, int passlen, 79 ASN1_TYPE *param, const EVP_CIPHER *cipher, const EVP_MD *md, int en_de) 80 { 81 EVP_MD_CTX ctx; 82 unsigned char md_tmp[EVP_MAX_MD_SIZE]; 83 unsigned char key[EVP_MAX_KEY_LENGTH], iv[EVP_MAX_IV_LENGTH]; 84 int i; 85 PBEPARAM *pbe; 86 int saltlen, iter; 87 unsigned char *salt; 88 const unsigned char *pbuf; 89 int mdsize; 90 int rv = 0; 91 92 /* Extract useful info from parameter */ 93 if (param == NULL || param->type != V_ASN1_SEQUENCE || 94 param->value.sequence == NULL) { 95 EVPerror(EVP_R_DECODE_ERROR); 96 return 0; 97 } 98 99 mdsize = EVP_MD_size(md); 100 if (mdsize < 0) 101 return 0; 102 103 pbuf = param->value.sequence->data; 104 if (!(pbe = d2i_PBEPARAM(NULL, &pbuf, param->value.sequence->length))) { 105 EVPerror(EVP_R_DECODE_ERROR); 106 return 0; 107 } 108 109 if (!pbe->iter) 110 iter = 1; 111 else if ((iter = ASN1_INTEGER_get(pbe->iter)) <= 0) { 112 EVPerror(EVP_R_UNSUPORTED_NUMBER_OF_ROUNDS); 113 PBEPARAM_free(pbe); 114 return 0; 115 } 116 salt = pbe->salt->data; 117 saltlen = pbe->salt->length; 118 119 if (!pass) 120 passlen = 0; 121 else if (passlen == -1) 122 passlen = strlen(pass); 123 124 EVP_MD_CTX_init(&ctx); 125 126 if (!EVP_DigestInit_ex(&ctx, md, NULL)) 127 goto err; 128 if (!EVP_DigestUpdate(&ctx, pass, passlen)) 129 goto err; 130 if (!EVP_DigestUpdate(&ctx, salt, saltlen)) 131 goto err; 132 if (!EVP_DigestFinal_ex(&ctx, md_tmp, NULL)) 133 goto err; 134 for (i = 1; i < iter; i++) { 135 if (!EVP_DigestInit_ex(&ctx, md, NULL)) 136 goto err; 137 if (!EVP_DigestUpdate(&ctx, md_tmp, mdsize)) 138 goto err; 139 if (!EVP_DigestFinal_ex (&ctx, md_tmp, NULL)) 140 goto err; 141 } 142 if ((size_t)EVP_CIPHER_key_length(cipher) > sizeof(md_tmp)) { 143 EVPerror(EVP_R_BAD_KEY_LENGTH); 144 goto err; 145 } 146 memcpy(key, md_tmp, EVP_CIPHER_key_length(cipher)); 147 if ((size_t)EVP_CIPHER_iv_length(cipher) > 16) { 148 EVPerror(EVP_R_IV_TOO_LARGE); 149 goto err; 150 } 151 memcpy(iv, md_tmp + (16 - EVP_CIPHER_iv_length(cipher)), 152 EVP_CIPHER_iv_length(cipher)); 153 if (!EVP_CipherInit_ex(cctx, cipher, NULL, key, iv, en_de)) 154 goto err; 155 explicit_bzero(md_tmp, EVP_MAX_MD_SIZE); 156 explicit_bzero(key, EVP_MAX_KEY_LENGTH); 157 explicit_bzero(iv, EVP_MAX_IV_LENGTH); 158 rv = 1; 159 err: 160 EVP_MD_CTX_cleanup(&ctx); 161 PBEPARAM_free(pbe); 162 return rv; 163 } 164