1 /* $OpenBSD: cms_dd.c,v 1.14 2019/08/11 11:04:18 jsing 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 "cryptlib.h" 58 #include <openssl/asn1t.h> 59 #include <openssl/pem.h> 60 #include <openssl/x509v3.h> 61 #include <openssl/err.h> 62 #include <openssl/cms.h> 63 #include "cms_lcl.h" 64 65 /* CMS DigestedData Utilities */ 66 67 CMS_ContentInfo * 68 cms_DigestedData_create(const EVP_MD *md) 69 { 70 CMS_ContentInfo *cms; 71 CMS_DigestedData *dd; 72 73 cms = CMS_ContentInfo_new(); 74 if (cms == NULL) 75 return NULL; 76 77 dd = (CMS_DigestedData *)ASN1_item_new(&CMS_DigestedData_it); 78 79 if (dd == NULL) 80 goto err; 81 82 cms->contentType = OBJ_nid2obj(NID_pkcs7_digest); 83 cms->d.digestedData = dd; 84 85 dd->version = 0; 86 dd->encapContentInfo->eContentType = OBJ_nid2obj(NID_pkcs7_data); 87 88 X509_ALGOR_set_md(dd->digestAlgorithm, md); 89 90 return cms; 91 92 err: 93 CMS_ContentInfo_free(cms); 94 95 return NULL; 96 } 97 98 BIO * 99 cms_DigestedData_init_bio(CMS_ContentInfo *cms) 100 { 101 CMS_DigestedData *dd; 102 103 dd = cms->d.digestedData; 104 105 return cms_DigestAlgorithm_init_bio(dd->digestAlgorithm); 106 } 107 108 int 109 cms_DigestedData_do_final(CMS_ContentInfo *cms, BIO *chain, int verify) 110 { 111 EVP_MD_CTX *mctx = EVP_MD_CTX_new(); 112 unsigned char md[EVP_MAX_MD_SIZE]; 113 unsigned int mdlen; 114 int r = 0; 115 CMS_DigestedData *dd; 116 117 if (mctx == NULL) { 118 CMSerror(ERR_R_MALLOC_FAILURE); 119 goto err; 120 } 121 122 dd = cms->d.digestedData; 123 124 if (!cms_DigestAlgorithm_find_ctx(mctx, chain, dd->digestAlgorithm)) 125 goto err; 126 127 if (EVP_DigestFinal_ex(mctx, md, &mdlen) <= 0) 128 goto err; 129 130 if (verify) { 131 if (mdlen != (unsigned int)dd->digest->length) { 132 CMSerror(CMS_R_MESSAGEDIGEST_WRONG_LENGTH); 133 goto err; 134 } 135 136 if (memcmp(md, dd->digest->data, mdlen)) 137 CMSerror(CMS_R_VERIFICATION_FAILURE); 138 else 139 r = 1; 140 } else { 141 if (!ASN1_STRING_set(dd->digest, md, mdlen)) 142 goto err; 143 r = 1; 144 } 145 146 err: 147 EVP_MD_CTX_free(mctx); 148 149 return r; 150 } 151