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/evp.h>
18#include <openssl/x509.h>
19#include <openssl/objects.h>
20#include <openssl/buffer.h>
21#include "crypto/asn1.h"
22#include "crypto/evp.h"
23
24#ifndef NO_ASN1_OLD
25
26int ASN1_sign(i2d_of_void *i2d, X509_ALGOR *algor1, X509_ALGOR *algor2,
27 ASN1_BIT_STRING *signature, char *data, EVP_PKEY *pkey,
28 const EVP_MD *type)
29{
30 EVP_MD_CTX *ctx = EVP_MD_CTX_new();
31 unsigned char *p, *buf_in = NULL, *buf_out = NULL;
32 int i, inl = 0, outl = 0;
33 size_t inll = 0, outll = 0;
34 X509_ALGOR *a;
35
36 if (ctx == NULL) {
37 ASN1err(ASN1_F_ASN1_SIGN, ERR_R_MALLOC_FAILURE);
38 goto err;
39 }
40 for (i = 0; i < 2; i++) {
41 if (i == 0)
42 a = algor1;
43 else
44 a = algor2;
45 if (a == NULL)
46 continue;
47 if (type->pkey_type == NID_dsaWithSHA1) {
48 /*
49 * special case: RFC 2459 tells us to omit 'parameters' with
50 * id-dsa-with-sha1
51 */
52 ASN1_TYPE_free(a->parameter);
53 a->parameter = NULL;
54 } else if ((a->parameter == NULL) ||
55 (a->parameter->type != V_ASN1_NULL)) {
56 ASN1_TYPE_free(a->parameter);
57 if ((a->parameter = ASN1_TYPE_new()) == NULL)
58 goto err;
59 a->parameter->type = V_ASN1_NULL;
60 }
61 ASN1_OBJECT_free(a->algorithm);
62 a->algorithm = OBJ_nid2obj(type->pkey_type);
63 if (a->algorithm == NULL) {
64 ASN1err(ASN1_F_ASN1_SIGN, ASN1_R_UNKNOWN_OBJECT_TYPE);
65 goto err;
66 }
67 if (a->algorithm->length == 0) {
68 ASN1err(ASN1_F_ASN1_SIGN,
69 ASN1_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);
70 goto err;
71 }
72 }
73 inl = i2d(data, NULL);
74 if (inl <= 0) {
75 ASN1err(ASN1_F_ASN1_SIGN, ERR_R_INTERNAL_ERROR);
76 goto err;
77 }
78 inll = (size_t)inl;
79 buf_in = OPENSSL_malloc(inll);
80 outll = outl = EVP_PKEY_size(pkey);
81 buf_out = OPENSSL_malloc(outll);
82 if (buf_in == NULL || buf_out == NULL) {
83 outl = 0;
84 ASN1err(ASN1_F_ASN1_SIGN, ERR_R_MALLOC_FAILURE);
85 goto err;
86 }
87 p = buf_in;
88
89 i2d(data, &p);
90 if (!EVP_SignInit_ex(ctx, type, NULL)
91 || !EVP_SignUpdate(ctx, (unsigned char *)buf_in, inl)
92 || !EVP_SignFinal(ctx, (unsigned char *)buf_out,
93 (unsigned int *)&outl, pkey)) {
94 outl = 0;
95 ASN1err(ASN1_F_ASN1_SIGN, ERR_R_EVP_LIB);
96 goto err;
97 }
98 OPENSSL_free(signature->data);
99 signature->data = buf_out;
100 buf_out = NULL;
101 signature->length = outl;
102 /*
103 * In the interests of compatibility, I'll make sure that the bit string
104 * has a 'not-used bits' value of 0
105 */
106 signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
107 signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;
108 err:
109 EVP_MD_CTX_free(ctx);
110 OPENSSL_clear_free((char *)buf_in, inll);
111 OPENSSL_clear_free((char *)buf_out, outll);
112 return outl;
113}
114
115#endif
116
117int ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1,
118 X509_ALGOR *algor2, ASN1_BIT_STRING *signature, void *asn,
119 EVP_PKEY *pkey, const EVP_MD *type)
120{
121 int rv;
122 EVP_MD_CTX *ctx = EVP_MD_CTX_new();
123
124 if (ctx == NULL) {
125 ASN1err(ASN1_F_ASN1_ITEM_SIGN, ERR_R_MALLOC_FAILURE);
126 return 0;
127 }
128 if (!EVP_DigestSignInit(ctx, NULL, type, NULL, pkey)) {
129 EVP_MD_CTX_free(ctx);
130 return 0;
131 }
132
133 rv = ASN1_item_sign_ctx(it, algor1, algor2, signature, asn, ctx);
134
135 EVP_MD_CTX_free(ctx);
136 return rv;
137}
138
139int ASN1_item_sign_ctx(const ASN1_ITEM *it,
140 X509_ALGOR *algor1, X509_ALGOR *algor2,
141 ASN1_BIT_STRING *signature, void *asn, EVP_MD_CTX *ctx)
142{
143 const EVP_MD *type;
144 EVP_PKEY *pkey;
145 unsigned char *buf_in = NULL, *buf_out = NULL;
146 size_t inl = 0, outl = 0, outll = 0;
147 int signid, paramtype, buf_len = 0;
148 int rv, pkey_id;
149
150 type = EVP_MD_CTX_md(ctx);
151 pkey = EVP_PKEY_CTX_get0_pkey(EVP_MD_CTX_pkey_ctx(ctx));
152
153 if (pkey == NULL) {
154 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_CONTEXT_NOT_INITIALISED);
155 goto err;
156 }
157
158 if (pkey->ameth == NULL) {
159 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
160 goto err;
161 }
162
163 if (pkey->ameth->item_sign) {
164 rv = pkey->ameth->item_sign(ctx, it, asn, algor1, algor2, signature);
165 if (rv == 1)
166 outl = signature->length;
167 /*-
168 * Return value meanings:
169 * <=0: error.
170 * 1: method does everything.
171 * 2: carry on as normal.
172 * 3: ASN1 method sets algorithm identifiers: just sign.
173 */
174 if (rv <= 0)
175 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB);
176 if (rv <= 1)
177 goto err;
178 } else {
179 rv = 2;
180 }
181
182 if (rv == 2) {
183 if (type == NULL) {
184 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_CONTEXT_NOT_INITIALISED);
185 goto err;
186 }
187
188 pkey_id =
189#ifndef OPENSSL_NO_SM2
190 EVP_PKEY_id(pkey) == NID_sm2 ? NID_sm2 :
191#endif
192 pkey->ameth->pkey_id;
193
194 if (!OBJ_find_sigid_by_algs(&signid, EVP_MD_nid(type), pkey_id)) {
195 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX,
196 ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
197 goto err;
198 }
199
200 if (pkey->ameth->pkey_flags & ASN1_PKEY_SIGPARAM_NULL)
201 paramtype = V_ASN1_NULL;
202 else
203 paramtype = V_ASN1_UNDEF;
204
205 if (algor1)
206 X509_ALGOR_set0(algor1, OBJ_nid2obj(signid), paramtype, NULL);
207 if (algor2)
208 X509_ALGOR_set0(algor2, OBJ_nid2obj(signid), paramtype, NULL);
209
210 }
211
212 buf_len = ASN1_item_i2d(asn, &buf_in, it);
213 if (buf_len <= 0) {
214 outl = 0;
215 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_INTERNAL_ERROR);
216 goto err;
217 }
218 inl = buf_len;
219 outll = outl = EVP_PKEY_size(pkey);
220 buf_out = OPENSSL_malloc(outll);
221 if (buf_in == NULL || buf_out == NULL) {
222 outl = 0;
223 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_MALLOC_FAILURE);
224 goto err;
225 }
226
227 if (!EVP_DigestSign(ctx, buf_out, &outl, buf_in, inl)) {
228 outl = 0;
229 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB);
230 goto err;
231 }
232 OPENSSL_free(signature->data);
233 signature->data = buf_out;
234 buf_out = NULL;
235 signature->length = outl;
236 /*
237 * In the interests of compatibility, I'll make sure that the bit string
238 * has a 'not-used bits' value of 0
239 */
240 signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
241 signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;
242 err:
243 OPENSSL_clear_free((char *)buf_in, inl);
244 OPENSSL_clear_free((char *)buf_out, outll);
245 return outl;
246}
247