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_EVP_LIB);
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 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 ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
96 goto err;
97 }
98 ASN1_STRING_set0(signature, buf_out, outl);
99 buf_out = NULL;
100 /*
101 * In the interests of compatibility, I'll make sure that the bit string
102 * has a 'not-used bits' value of 0
103 */
104 ossl_asn1_string_set_bits_left(signature, 0);
105 err:
106 EVP_MD_CTX_free(ctx);
107 OPENSSL_clear_free((char *)buf_in, inll);
108 OPENSSL_clear_free((char *)buf_out, outll);
109 return outl;
110 }
111
112 #endif
113
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)114 int ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1, X509_ALGOR *algor2,
115 ASN1_BIT_STRING *signature, const void *data,
116 EVP_PKEY *pkey, const EVP_MD *md)
117 {
118 return ASN1_item_sign_ex(it, algor1, algor2, signature, data, NULL, pkey,
119 md, NULL, NULL);
120 }
121
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)122 int ASN1_item_sign_ex(const ASN1_ITEM *it, X509_ALGOR *algor1,
123 X509_ALGOR *algor2, ASN1_BIT_STRING *signature,
124 const void *data, const ASN1_OCTET_STRING *id,
125 EVP_PKEY *pkey, const EVP_MD *md, OSSL_LIB_CTX *libctx,
126 const char *propq)
127 {
128 int rv = 0;
129 EVP_MD_CTX *ctx = evp_md_ctx_new_ex(pkey, id, libctx, propq);
130
131 if (ctx == NULL) {
132 ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
133 return 0;
134 }
135 /* We can use the non _ex variant here since the pkey is already setup */
136 if (!EVP_DigestSignInit(ctx, NULL, md, NULL, pkey))
137 goto err;
138
139 rv = ASN1_item_sign_ctx(it, algor1, algor2, signature, data, ctx);
140
141 err:
142 EVP_PKEY_CTX_free(EVP_MD_CTX_get_pkey_ctx(ctx));
143 EVP_MD_CTX_free(ctx);
144 return rv;
145 }
146
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)147 int ASN1_item_sign_ctx(const ASN1_ITEM *it, X509_ALGOR *algor1,
148 X509_ALGOR *algor2, ASN1_BIT_STRING *signature,
149 const void *data, EVP_MD_CTX *ctx)
150 {
151 const EVP_MD *md;
152 EVP_PKEY *pkey;
153 unsigned char *buf_in = NULL, *buf_out = NULL;
154 size_t inl = 0, outl = 0, outll = 0;
155 int signid, paramtype, buf_len = 0;
156 int rv, pkey_id;
157
158 md = EVP_MD_CTX_get0_md(ctx);
159 pkey = EVP_PKEY_CTX_get0_pkey(EVP_MD_CTX_get_pkey_ctx(ctx));
160
161 if (pkey == NULL) {
162 ERR_raise(ERR_LIB_ASN1, ASN1_R_CONTEXT_NOT_INITIALISED);
163 goto err;
164 }
165
166 if (pkey->ameth == NULL) {
167 EVP_PKEY_CTX *pctx = EVP_MD_CTX_get_pkey_ctx(ctx);
168 OSSL_PARAM params[2];
169 unsigned char aid[128];
170 size_t aid_len = 0;
171
172 if (pctx == NULL
173 || !EVP_PKEY_CTX_IS_SIGNATURE_OP(pctx)) {
174 ERR_raise(ERR_LIB_ASN1, ASN1_R_CONTEXT_NOT_INITIALISED);
175 goto err;
176 }
177
178 params[0] =
179 OSSL_PARAM_construct_octet_string(OSSL_SIGNATURE_PARAM_ALGORITHM_ID,
180 aid, sizeof(aid));
181 params[1] = OSSL_PARAM_construct_end();
182
183 if (EVP_PKEY_CTX_get_params(pctx, params) <= 0)
184 goto err;
185
186 if ((aid_len = params[0].return_size) == 0) {
187 ERR_raise(ERR_LIB_ASN1, ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
188 goto err;
189 }
190
191 if (algor1 != NULL) {
192 const unsigned char *pp = aid;
193
194 if (d2i_X509_ALGOR(&algor1, &pp, aid_len) == NULL) {
195 ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
196 goto err;
197 }
198 }
199
200 if (algor2 != NULL) {
201 const unsigned char *pp = aid;
202
203 if (d2i_X509_ALGOR(&algor2, &pp, aid_len) == NULL) {
204 ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
205 goto err;
206 }
207 }
208
209 rv = 3;
210 } else if (pkey->ameth->item_sign) {
211 rv = pkey->ameth->item_sign(ctx, it, data, algor1, algor2, signature);
212 if (rv == 1)
213 outl = signature->length;
214 /*-
215 * Return value meanings:
216 * <=0: error.
217 * 1: method does everything.
218 * 2: carry on as normal.
219 * 3: ASN1 method sets algorithm identifiers: just sign.
220 */
221 if (rv <= 0)
222 ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
223 if (rv <= 1)
224 goto err;
225 } else {
226 rv = 2;
227 }
228
229 if (rv == 2) {
230 if (md == NULL) {
231 ERR_raise(ERR_LIB_ASN1, ASN1_R_CONTEXT_NOT_INITIALISED);
232 goto err;
233 }
234
235 pkey_id =
236 #ifndef OPENSSL_NO_SM2
237 EVP_PKEY_get_id(pkey) == NID_sm2 ? NID_sm2 :
238 #endif
239 pkey->ameth->pkey_id;
240
241 if (!OBJ_find_sigid_by_algs(&signid, EVP_MD_nid(md), pkey_id)) {
242 ERR_raise(ERR_LIB_ASN1, ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
243 goto err;
244 }
245
246 paramtype = pkey->ameth->pkey_flags & ASN1_PKEY_SIGPARAM_NULL ?
247 V_ASN1_NULL : V_ASN1_UNDEF;
248 if (algor1 != NULL
249 && !X509_ALGOR_set0(algor1, OBJ_nid2obj(signid), paramtype, NULL))
250 goto err;
251 if (algor2 != NULL
252 && !X509_ALGOR_set0(algor2, OBJ_nid2obj(signid), paramtype, NULL))
253 goto err;
254 }
255
256 buf_len = ASN1_item_i2d(data, &buf_in, it);
257 if (buf_len <= 0) {
258 outl = 0;
259 ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
260 goto err;
261 }
262 inl = buf_len;
263 if (!EVP_DigestSign(ctx, NULL, &outll, buf_in, inl)) {
264 outl = 0;
265 ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
266 goto err;
267 }
268 outl = outll;
269 buf_out = OPENSSL_malloc(outll);
270 if (buf_in == NULL || buf_out == NULL) {
271 outl = 0;
272 goto err;
273 }
274
275 if (!EVP_DigestSign(ctx, buf_out, &outl, buf_in, inl)) {
276 outl = 0;
277 ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
278 goto err;
279 }
280 ASN1_STRING_set0(signature, buf_out, outl);
281 buf_out = NULL;
282 /*
283 * In the interests of compatibility, I'll make sure that the bit string
284 * has a 'not-used bits' value of 0
285 */
286 ossl_asn1_string_set_bits_left(signature, 0);
287 err:
288 OPENSSL_clear_free((char *)buf_in, inl);
289 OPENSSL_clear_free((char *)buf_out, outll);
290 return outl;
291 }
292
