1 /*
2 * Copyright 1995-2022 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 <openssl/core_names.h>
22 #include "crypto/asn1.h"
23 #include "crypto/evp.h"
24
25 #ifndef OPENSSL_NO_DEPRECATED_3_0
26
ASN1_sign(i2d_of_void * i2d,X509_ALGOR * algor1,X509_ALGOR * algor2,ASN1_BIT_STRING * signature,char * data,EVP_PKEY * pkey,const EVP_MD * type)27 int ASN1_sign(i2d_of_void *i2d, X509_ALGOR *algor1, X509_ALGOR *algor2,
28 ASN1_BIT_STRING *signature, char *data, EVP_PKEY *pkey,
29 const EVP_MD *type)
30 {
31 EVP_MD_CTX *ctx = EVP_MD_CTX_new();
32 unsigned char *p, *buf_in = NULL, *buf_out = NULL;
33 int i, inl = 0, outl = 0;
34 size_t inll = 0, outll = 0;
35 X509_ALGOR *a;
36
37 if (ctx == NULL) {
38 ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
39 goto err;
40 }
41 for (i = 0; i < 2; i++) {
42 if (i == 0)
43 a = algor1;
44 else
45 a = algor2;
46 if (a == NULL)
47 continue;
48 if (type->pkey_type == NID_dsaWithSHA1) {
49 /*
50 * special case: RFC 2459 tells us to omit 'parameters' with
51 * id-dsa-with-sha1
52 */
53 ASN1_TYPE_free(a->parameter);
54 a->parameter = NULL;
55 } else if ((a->parameter == NULL) ||
56 (a->parameter->type != V_ASN1_NULL)) {
57 ASN1_TYPE_free(a->parameter);
58 if ((a->parameter = ASN1_TYPE_new()) == NULL)
59 goto err;
60 a->parameter->type = V_ASN1_NULL;
61 }
62 ASN1_OBJECT_free(a->algorithm);
63 a->algorithm = OBJ_nid2obj(type->pkey_type);
64 if (a->algorithm == NULL) {
65 ERR_raise(ERR_LIB_ASN1, ASN1_R_UNKNOWN_OBJECT_TYPE);
66 goto err;
67 }
68 if (a->algorithm->length == 0) {
69 ERR_raise(ERR_LIB_ASN1,
70 ASN1_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);
71 goto err;
72 }
73 }
74 inl = i2d(data, NULL);
75 if (inl <= 0) {
76 ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
77 goto err;
78 }
79 inll = (size_t)inl;
80 buf_in = OPENSSL_malloc(inll);
81 outll = outl = EVP_PKEY_get_size(pkey);
82 buf_out = OPENSSL_malloc(outll);
83 if (buf_in == NULL || buf_out == NULL) {
84 outl = 0;
85 ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
86 goto err;
87 }
88 p = buf_in;
89
90 i2d(data, &p);
91 if (!EVP_SignInit_ex(ctx, type, NULL)
92 || !EVP_SignUpdate(ctx, (unsigned char *)buf_in, inl)
93 || !EVP_SignFinal(ctx, (unsigned char *)buf_out,
94 (unsigned int *)&outl, pkey)) {
95 outl = 0;
96 ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
97 goto err;
98 }
99 ASN1_STRING_set0(signature, buf_out, outl);
100 buf_out = NULL;
101 /*
102 * In the interests of compatibility, I'll make sure that the bit string
103 * has a 'not-used bits' value of 0
104 */
105 ossl_asn1_string_set_bits_left(signature, 0);
106 err:
107 EVP_MD_CTX_free(ctx);
108 OPENSSL_clear_free((char *)buf_in, inll);
109 OPENSSL_clear_free((char *)buf_out, outll);
110 return outl;
111 }
112
113 #endif
114
ASN1_item_sign(const ASN1_ITEM * it,X509_ALGOR * algor1,X509_ALGOR * algor2,ASN1_BIT_STRING * signature,const void * data,EVP_PKEY * pkey,const EVP_MD * md)115 int ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1, X509_ALGOR *algor2,
116 ASN1_BIT_STRING *signature, const void *data,
117 EVP_PKEY *pkey, const EVP_MD *md)
118 {
119 return ASN1_item_sign_ex(it, algor1, algor2, signature, data, NULL, pkey,
120 md, NULL, NULL);
121 }
122
ASN1_item_sign_ex(const ASN1_ITEM * it,X509_ALGOR * algor1,X509_ALGOR * algor2,ASN1_BIT_STRING * signature,const void * data,const ASN1_OCTET_STRING * id,EVP_PKEY * pkey,const EVP_MD * md,OSSL_LIB_CTX * libctx,const char * propq)123 int ASN1_item_sign_ex(const ASN1_ITEM *it, X509_ALGOR *algor1,
124 X509_ALGOR *algor2, ASN1_BIT_STRING *signature,
125 const void *data, const ASN1_OCTET_STRING *id,
126 EVP_PKEY *pkey, const EVP_MD *md, OSSL_LIB_CTX *libctx,
127 const char *propq)
128 {
129 int rv = 0;
130 EVP_MD_CTX *ctx = evp_md_ctx_new_ex(pkey, id, libctx, propq);
131
132 if (ctx == NULL) {
133 ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
134 return 0;
135 }
136 /* We can use the non _ex variant here since the pkey is already setup */
137 if (!EVP_DigestSignInit(ctx, NULL, md, NULL, pkey))
138 goto err;
139
140 rv = ASN1_item_sign_ctx(it, algor1, algor2, signature, data, ctx);
141
142 err:
143 EVP_PKEY_CTX_free(EVP_MD_CTX_get_pkey_ctx(ctx));
144 EVP_MD_CTX_free(ctx);
145 return rv;
146 }
147
ASN1_item_sign_ctx(const ASN1_ITEM * it,X509_ALGOR * algor1,X509_ALGOR * algor2,ASN1_BIT_STRING * signature,const void * data,EVP_MD_CTX * ctx)148 int ASN1_item_sign_ctx(const ASN1_ITEM *it, X509_ALGOR *algor1,
149 X509_ALGOR *algor2, ASN1_BIT_STRING *signature,
150 const void *data, EVP_MD_CTX *ctx)
151 {
152 const EVP_MD *md;
153 EVP_PKEY *pkey;
154 unsigned char *buf_in = NULL, *buf_out = NULL;
155 size_t inl = 0, outl = 0, outll = 0;
156 int signid, paramtype, buf_len = 0;
157 int rv, pkey_id;
158
159 md = EVP_MD_CTX_get0_md(ctx);
160 pkey = EVP_PKEY_CTX_get0_pkey(EVP_MD_CTX_get_pkey_ctx(ctx));
161
162 if (pkey == NULL) {
163 ERR_raise(ERR_LIB_ASN1, ASN1_R_CONTEXT_NOT_INITIALISED);
164 goto err;
165 }
166
167 if (pkey->ameth == NULL) {
168 EVP_PKEY_CTX *pctx = EVP_MD_CTX_get_pkey_ctx(ctx);
169 OSSL_PARAM params[2];
170 unsigned char aid[128];
171 size_t aid_len = 0;
172
173 if (pctx == NULL
174 || !EVP_PKEY_CTX_IS_SIGNATURE_OP(pctx)) {
175 ERR_raise(ERR_LIB_ASN1, ASN1_R_CONTEXT_NOT_INITIALISED);
176 goto err;
177 }
178
179 params[0] =
180 OSSL_PARAM_construct_octet_string(OSSL_SIGNATURE_PARAM_ALGORITHM_ID,
181 aid, sizeof(aid));
182 params[1] = OSSL_PARAM_construct_end();
183
184 if (EVP_PKEY_CTX_get_params(pctx, params) <= 0)
185 goto err;
186
187 if ((aid_len = params[0].return_size) == 0) {
188 ERR_raise(ERR_LIB_ASN1, ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
189 goto err;
190 }
191
192 if (algor1 != NULL) {
193 const unsigned char *pp = aid;
194
195 if (d2i_X509_ALGOR(&algor1, &pp, aid_len) == NULL) {
196 ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
197 goto err;
198 }
199 }
200
201 if (algor2 != NULL) {
202 const unsigned char *pp = aid;
203
204 if (d2i_X509_ALGOR(&algor2, &pp, aid_len) == NULL) {
205 ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
206 goto err;
207 }
208 }
209
210 rv = 3;
211 } else if (pkey->ameth->item_sign) {
212 rv = pkey->ameth->item_sign(ctx, it, data, algor1, algor2, signature);
213 if (rv == 1)
214 outl = signature->length;
215 /*-
216 * Return value meanings:
217 * <=0: error.
218 * 1: method does everything.
219 * 2: carry on as normal.
220 * 3: ASN1 method sets algorithm identifiers: just sign.
221 */
222 if (rv <= 0)
223 ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
224 if (rv <= 1)
225 goto err;
226 } else {
227 rv = 2;
228 }
229
230 if (rv == 2) {
231 if (md == NULL) {
232 ERR_raise(ERR_LIB_ASN1, ASN1_R_CONTEXT_NOT_INITIALISED);
233 goto err;
234 }
235
236 pkey_id =
237 #ifndef OPENSSL_NO_SM2
238 EVP_PKEY_get_id(pkey) == NID_sm2 ? NID_sm2 :
239 #endif
240 pkey->ameth->pkey_id;
241
242 if (!OBJ_find_sigid_by_algs(&signid, EVP_MD_nid(md), pkey_id)) {
243 ERR_raise(ERR_LIB_ASN1, ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
244 goto err;
245 }
246
247 paramtype = pkey->ameth->pkey_flags & ASN1_PKEY_SIGPARAM_NULL ?
248 V_ASN1_NULL : V_ASN1_UNDEF;
249 if (algor1 != NULL
250 && !X509_ALGOR_set0(algor1, OBJ_nid2obj(signid), paramtype, NULL))
251 goto err;
252 if (algor2 != NULL
253 && !X509_ALGOR_set0(algor2, OBJ_nid2obj(signid), paramtype, NULL))
254 goto err;
255 }
256
257 buf_len = ASN1_item_i2d(data, &buf_in, it);
258 if (buf_len <= 0) {
259 outl = 0;
260 ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
261 goto err;
262 }
263 inl = buf_len;
264 if (!EVP_DigestSign(ctx, NULL, &outll, buf_in, inl)) {
265 outl = 0;
266 ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
267 goto err;
268 }
269 outl = outll;
270 buf_out = OPENSSL_malloc(outll);
271 if (buf_in == NULL || buf_out == NULL) {
272 outl = 0;
273 ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
274 goto err;
275 }
276
277 if (!EVP_DigestSign(ctx, buf_out, &outl, buf_in, inl)) {
278 outl = 0;
279 ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
280 goto err;
281 }
282 ASN1_STRING_set0(signature, buf_out, outl);
283 buf_out = NULL;
284 /*
285 * In the interests of compatibility, I'll make sure that the bit string
286 * has a 'not-used bits' value of 0
287 */
288 ossl_asn1_string_set_bits_left(signature, 0);
289 err:
290 OPENSSL_clear_free((char *)buf_in, inl);
291 OPENSSL_clear_free((char *)buf_out, outll);
292 return outl;
293 }
294
