1 /* $OpenBSD: cms_dd.c,v 1.16 2023/10/18 07:24:15 tb Exp $ */ 2 /* 3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL 4 * project. 5 */ 6 /* ==================================================================== 7 * Copyright (c) 2008 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 55 #include <string.h> 56 57 #include <openssl/asn1.h> 58 #include <openssl/err.h> 59 #include <openssl/evp.h> 60 #include <openssl/cms.h> 61 #include <openssl/objects.h> 62 63 #include "cms_local.h" 64 #include "x509_local.h" 65 66 /* CMS DigestedData Utilities */ 67 68 CMS_ContentInfo * 69 cms_DigestedData_create(const EVP_MD *md) 70 { 71 CMS_ContentInfo *cms; 72 CMS_DigestedData *dd; 73 74 cms = CMS_ContentInfo_new(); 75 if (cms == NULL) 76 return NULL; 77 78 dd = (CMS_DigestedData *)ASN1_item_new(&CMS_DigestedData_it); 79 80 if (dd == NULL) 81 goto err; 82 83 cms->contentType = OBJ_nid2obj(NID_pkcs7_digest); 84 cms->d.digestedData = dd; 85 86 dd->version = 0; 87 dd->encapContentInfo->eContentType = OBJ_nid2obj(NID_pkcs7_data); 88 89 if (!X509_ALGOR_set_evp_md(dd->digestAlgorithm, md)) 90 goto err; 91 92 return cms; 93 94 err: 95 CMS_ContentInfo_free(cms); 96 97 return NULL; 98 } 99 100 BIO * 101 cms_DigestedData_init_bio(CMS_ContentInfo *cms) 102 { 103 CMS_DigestedData *dd; 104 105 dd = cms->d.digestedData; 106 107 return cms_DigestAlgorithm_init_bio(dd->digestAlgorithm); 108 } 109 110 int 111 cms_DigestedData_do_final(CMS_ContentInfo *cms, BIO *chain, int verify) 112 { 113 EVP_MD_CTX *mctx = EVP_MD_CTX_new(); 114 unsigned char md[EVP_MAX_MD_SIZE]; 115 unsigned int mdlen; 116 int r = 0; 117 CMS_DigestedData *dd; 118 119 if (mctx == NULL) { 120 CMSerror(ERR_R_MALLOC_FAILURE); 121 goto err; 122 } 123 124 dd = cms->d.digestedData; 125 126 if (!cms_DigestAlgorithm_find_ctx(mctx, chain, dd->digestAlgorithm)) 127 goto err; 128 129 if (EVP_DigestFinal_ex(mctx, md, &mdlen) <= 0) 130 goto err; 131 132 if (verify) { 133 if (mdlen != (unsigned int)dd->digest->length) { 134 CMSerror(CMS_R_MESSAGEDIGEST_WRONG_LENGTH); 135 goto err; 136 } 137 138 if (memcmp(md, dd->digest->data, mdlen)) 139 CMSerror(CMS_R_VERIFICATION_FAILURE); 140 else 141 r = 1; 142 } else { 143 if (!ASN1_STRING_set(dd->digest, md, mdlen)) 144 goto err; 145 r = 1; 146 } 147 148 err: 149 EVP_MD_CTX_free(mctx); 150 151 return r; 152 } 153