1 /* 2 * Copyright 2008-2021 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the Apache License 2.0 (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 #include "internal/cryptlib.h" 11 #include <openssl/asn1t.h> 12 #include <openssl/pem.h> 13 #include <openssl/x509v3.h> 14 #include <openssl/err.h> 15 #include <openssl/cms.h> 16 #include "cms_local.h" 17 18 /* CMS DigestedData Utilities */ 19 20 CMS_ContentInfo *ossl_cms_DigestedData_create(const EVP_MD *md, 21 OSSL_LIB_CTX *libctx, 22 const char *propq) 23 { 24 CMS_ContentInfo *cms; 25 CMS_DigestedData *dd; 26 27 cms = CMS_ContentInfo_new_ex(libctx, propq); 28 if (cms == NULL) 29 return NULL; 30 31 dd = M_ASN1_new_of(CMS_DigestedData); 32 33 if (dd == NULL) 34 goto err; 35 36 cms->contentType = OBJ_nid2obj(NID_pkcs7_digest); 37 cms->d.digestedData = dd; 38 39 dd->version = 0; 40 dd->encapContentInfo->eContentType = OBJ_nid2obj(NID_pkcs7_data); 41 42 X509_ALGOR_set_md(dd->digestAlgorithm, md); 43 44 return cms; 45 46 err: 47 CMS_ContentInfo_free(cms); 48 return NULL; 49 } 50 51 BIO *ossl_cms_DigestedData_init_bio(const CMS_ContentInfo *cms) 52 { 53 CMS_DigestedData *dd = cms->d.digestedData; 54 55 return ossl_cms_DigestAlgorithm_init_bio(dd->digestAlgorithm, 56 ossl_cms_get0_cmsctx(cms)); 57 } 58 59 int ossl_cms_DigestedData_do_final(const CMS_ContentInfo *cms, BIO *chain, 60 int verify) 61 { 62 EVP_MD_CTX *mctx = EVP_MD_CTX_new(); 63 unsigned char md[EVP_MAX_MD_SIZE]; 64 unsigned int mdlen; 65 int r = 0; 66 CMS_DigestedData *dd; 67 68 if (mctx == NULL) { 69 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE); 70 goto err; 71 } 72 73 dd = cms->d.digestedData; 74 75 if (!ossl_cms_DigestAlgorithm_find_ctx(mctx, chain, dd->digestAlgorithm)) 76 goto err; 77 78 if (EVP_DigestFinal_ex(mctx, md, &mdlen) <= 0) 79 goto err; 80 81 if (verify) { 82 if (mdlen != (unsigned int)dd->digest->length) { 83 ERR_raise(ERR_LIB_CMS, CMS_R_MESSAGEDIGEST_WRONG_LENGTH); 84 goto err; 85 } 86 87 if (memcmp(md, dd->digest->data, mdlen)) 88 ERR_raise(ERR_LIB_CMS, CMS_R_VERIFICATION_FAILURE); 89 else 90 r = 1; 91 } else { 92 if (!ASN1_STRING_set(dd->digest, md, mdlen)) 93 goto err; 94 r = 1; 95 } 96 97 err: 98 EVP_MD_CTX_free(mctx); 99 100 return r; 101 102 } 103