1 /* 2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the OpenSSL license (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 <stdio.h> 11 #include <time.h> 12 #include <sys/types.h> 13 14 #include "internal/cryptlib.h" 15 16 #include <openssl/bn.h> 17 #include <openssl/x509.h> 18 #include <openssl/objects.h> 19 #include <openssl/buffer.h> 20 #include <openssl/evp.h> 21 #include "internal/asn1_int.h" 22 #include "internal/evp_int.h" 23 24 #ifndef NO_ASN1_OLD 25 26 int ASN1_verify(i2d_of_void *i2d, X509_ALGOR *a, ASN1_BIT_STRING *signature, 27 char *data, EVP_PKEY *pkey) 28 { 29 EVP_MD_CTX *ctx = EVP_MD_CTX_new(); 30 const EVP_MD *type; 31 unsigned char *p, *buf_in = NULL; 32 int ret = -1, i, inl; 33 34 if (ctx == NULL) { 35 ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_MALLOC_FAILURE); 36 goto err; 37 } 38 i = OBJ_obj2nid(a->algorithm); 39 type = EVP_get_digestbyname(OBJ_nid2sn(i)); 40 if (type == NULL) { 41 ASN1err(ASN1_F_ASN1_VERIFY, ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM); 42 goto err; 43 } 44 45 if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) { 46 ASN1err(ASN1_F_ASN1_VERIFY, ASN1_R_INVALID_BIT_STRING_BITS_LEFT); 47 goto err; 48 } 49 50 inl = i2d(data, NULL); 51 buf_in = OPENSSL_malloc((unsigned int)inl); 52 if (buf_in == NULL) { 53 ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_MALLOC_FAILURE); 54 goto err; 55 } 56 p = buf_in; 57 58 i2d(data, &p); 59 ret = EVP_VerifyInit_ex(ctx, type, NULL) 60 && EVP_VerifyUpdate(ctx, (unsigned char *)buf_in, inl); 61 62 OPENSSL_clear_free(buf_in, (unsigned int)inl); 63 64 if (!ret) { 65 ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_EVP_LIB); 66 goto err; 67 } 68 ret = -1; 69 70 if (EVP_VerifyFinal(ctx, (unsigned char *)signature->data, 71 (unsigned int)signature->length, pkey) <= 0) { 72 ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_EVP_LIB); 73 ret = 0; 74 goto err; 75 } 76 ret = 1; 77 err: 78 EVP_MD_CTX_free(ctx); 79 return ret; 80 } 81 82 #endif 83 84 int ASN1_item_verify(const ASN1_ITEM *it, X509_ALGOR *a, 85 ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey) 86 { 87 EVP_MD_CTX *ctx = NULL; 88 unsigned char *buf_in = NULL; 89 int ret = -1, inl = 0; 90 91 int mdnid, pknid; 92 93 if (!pkey) { 94 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_PASSED_NULL_PARAMETER); 95 return -1; 96 } 97 98 if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) { 99 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ASN1_R_INVALID_BIT_STRING_BITS_LEFT); 100 return -1; 101 } 102 103 ctx = EVP_MD_CTX_new(); 104 if (ctx == NULL) { 105 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_MALLOC_FAILURE); 106 goto err; 107 } 108 109 /* Convert signature OID into digest and public key OIDs */ 110 if (!OBJ_find_sigid_algs(OBJ_obj2nid(a->algorithm), &mdnid, &pknid)) { 111 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM); 112 goto err; 113 } 114 if (mdnid == NID_undef) { 115 if (!pkey->ameth || !pkey->ameth->item_verify) { 116 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, 117 ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM); 118 goto err; 119 } 120 ret = pkey->ameth->item_verify(ctx, it, asn, a, signature, pkey); 121 /* 122 * Return value of 2 means carry on, anything else means we exit 123 * straight away: either a fatal error of the underlying verification 124 * routine handles all verification. 125 */ 126 if (ret != 2) 127 goto err; 128 ret = -1; 129 } else { 130 const EVP_MD *type; 131 type = EVP_get_digestbynid(mdnid); 132 if (type == NULL) { 133 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, 134 ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM); 135 goto err; 136 } 137 138 /* Check public key OID matches public key type */ 139 if (EVP_PKEY_type(pknid) != pkey->ameth->pkey_id) { 140 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ASN1_R_WRONG_PUBLIC_KEY_TYPE); 141 goto err; 142 } 143 144 if (!EVP_DigestVerifyInit(ctx, NULL, type, NULL, pkey)) { 145 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_EVP_LIB); 146 ret = 0; 147 goto err; 148 } 149 150 } 151 152 inl = ASN1_item_i2d(asn, &buf_in, it); 153 154 if (buf_in == NULL) { 155 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_MALLOC_FAILURE); 156 goto err; 157 } 158 159 ret = EVP_DigestVerify(ctx, signature->data, (size_t)signature->length, 160 buf_in, inl); 161 if (ret <= 0) { 162 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_EVP_LIB); 163 goto err; 164 } 165 ret = 1; 166 err: 167 OPENSSL_clear_free(buf_in, (unsigned int)inl); 168 EVP_MD_CTX_free(ctx); 169 return ret; 170 } 171