1/*
2 * Copyright 1995-2016 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 <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 "crypto/asn1.h"
22#include "crypto/evp.h"
23
24#ifndef NO_ASN1_OLD
25
26int 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 if (inl <= 0) {
52 ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_INTERNAL_ERROR);
53 goto err;
54 }
55 buf_in = OPENSSL_malloc((unsigned int)inl);
56 if (buf_in == NULL) {
57 ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_MALLOC_FAILURE);
58 goto err;
59 }
60 p = buf_in;
61
62 i2d(data, &p);
63 ret = EVP_VerifyInit_ex(ctx, type, NULL)
64 && EVP_VerifyUpdate(ctx, (unsigned char *)buf_in, inl);
65
66 OPENSSL_clear_free(buf_in, (unsigned int)inl);
67
68 if (!ret) {
69 ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_EVP_LIB);
70 goto err;
71 }
72 ret = -1;
73
74 if (EVP_VerifyFinal(ctx, (unsigned char *)signature->data,
75 (unsigned int)signature->length, pkey) <= 0) {
76 ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_EVP_LIB);
77 ret = 0;
78 goto err;
79 }
80 ret = 1;
81 err:
82 EVP_MD_CTX_free(ctx);
83 return ret;
84}
85
86#endif
87
88int ASN1_item_verify(const ASN1_ITEM *it, X509_ALGOR *a,
89 ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey)
90{
91 EVP_MD_CTX *ctx = NULL;
92 unsigned char *buf_in = NULL;
93 int ret = -1, inl = 0;
94 int mdnid, pknid;
95 size_t inll = 0;
96
97 if (pkey == NULL) {
98 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_PASSED_NULL_PARAMETER);
99 return -1;
100 }
101
102 if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) {
103 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ASN1_R_INVALID_BIT_STRING_BITS_LEFT);
104 return -1;
105 }
106
107 ctx = EVP_MD_CTX_new();
108 if (ctx == NULL) {
109 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_MALLOC_FAILURE);
110 goto err;
111 }
112
113 /* Convert signature OID into digest and public key OIDs */
114 if (!OBJ_find_sigid_algs(OBJ_obj2nid(a->algorithm), &mdnid, &pknid)) {
115 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
116 goto err;
117 }
118 if (mdnid == NID_undef) {
119 if (pkey->ameth == NULL || pkey->ameth->item_verify == NULL) {
120 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,
121 ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
122 goto err;
123 }
124 ret = pkey->ameth->item_verify(ctx, it, asn, a, signature, pkey);
125 /*
126 * Return value of 2 means carry on, anything else means we exit
127 * straight away: either a fatal error of the underlying verification
128 * routine handles all verification.
129 */
130 if (ret != 2)
131 goto err;
132 ret = -1;
133 } else {
134 const EVP_MD *type = EVP_get_digestbynid(mdnid);
135
136 if (type == NULL) {
137 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,
138 ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
139 goto err;
140 }
141
142 /* Check public key OID matches public key type */
143 if (EVP_PKEY_type(pknid) != pkey->ameth->pkey_id) {
144 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ASN1_R_WRONG_PUBLIC_KEY_TYPE);
145 goto err;
146 }
147
148 if (!EVP_DigestVerifyInit(ctx, NULL, type, NULL, pkey)) {
149 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_EVP_LIB);
150 ret = 0;
151 goto err;
152 }
153 }
154
155 inl = ASN1_item_i2d(asn, &buf_in, it);
156 if (inl <= 0) {
157 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_INTERNAL_ERROR);
158 goto err;
159 }
160 if (buf_in == NULL) {
161 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_MALLOC_FAILURE);
162 goto err;
163 }
164 inll = inl;
165
166 ret = EVP_DigestVerify(ctx, signature->data, (size_t)signature->length,
167 buf_in, inl);
168 if (ret <= 0) {
169 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_EVP_LIB);
170 goto err;
171 }
172 ret = 1;
173 err:
174 OPENSSL_clear_free(buf_in, inll);
175 EVP_MD_CTX_free(ctx);
176 return ret;
177}
178