1 /*
2 * Copyright 1995-2021 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 OPENSSL_free(signature->data);
100 signature->data = buf_out;
101 buf_out = NULL;
102 signature->length = outl;
103 /*
104 * In the interests of compatibility, I'll make sure that the bit string
105 * has a 'not-used bits' value of 0
106 */
107 signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
108 signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;
109 err:
110 EVP_MD_CTX_free(ctx);
111 OPENSSL_clear_free((char *)buf_in, inll);
112 OPENSSL_clear_free((char *)buf_out, outll);
113 return outl;
114 }
115
116 #endif
117
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)118 int ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1, X509_ALGOR *algor2,
119 ASN1_BIT_STRING *signature, const void *data,
120 EVP_PKEY *pkey, const EVP_MD *md)
121 {
122 return ASN1_item_sign_ex(it, algor1, algor2, signature, data, NULL, pkey,
123 md, NULL, NULL);
124 }
125
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)126 int ASN1_item_sign_ex(const ASN1_ITEM *it, X509_ALGOR *algor1,
127 X509_ALGOR *algor2, ASN1_BIT_STRING *signature,
128 const void *data, const ASN1_OCTET_STRING *id,
129 EVP_PKEY *pkey, const EVP_MD *md, OSSL_LIB_CTX *libctx,
130 const char *propq)
131 {
132 int rv = 0;
133 EVP_MD_CTX *ctx = evp_md_ctx_new_ex(pkey, id, libctx, propq);
134
135 if (ctx == NULL) {
136 ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
137 return 0;
138 }
139 /* We can use the non _ex variant here since the pkey is already setup */
140 if (!EVP_DigestSignInit(ctx, NULL, md, NULL, pkey))
141 goto err;
142
143 rv = ASN1_item_sign_ctx(it, algor1, algor2, signature, data, ctx);
144
145 err:
146 EVP_PKEY_CTX_free(EVP_MD_CTX_get_pkey_ctx(ctx));
147 EVP_MD_CTX_free(ctx);
148 return rv;
149 }
150
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)151 int ASN1_item_sign_ctx(const ASN1_ITEM *it, X509_ALGOR *algor1,
152 X509_ALGOR *algor2, ASN1_BIT_STRING *signature,
153 const void *data, EVP_MD_CTX *ctx)
154 {
155 const EVP_MD *md;
156 EVP_PKEY *pkey;
157 unsigned char *buf_in = NULL, *buf_out = NULL;
158 size_t inl = 0, outl = 0, outll = 0;
159 int signid, paramtype, buf_len = 0;
160 int rv, pkey_id;
161
162 md = EVP_MD_CTX_get0_md(ctx);
163 pkey = EVP_PKEY_CTX_get0_pkey(EVP_MD_CTX_get_pkey_ctx(ctx));
164
165 if (pkey == NULL) {
166 ERR_raise(ERR_LIB_ASN1, ASN1_R_CONTEXT_NOT_INITIALISED);
167 goto err;
168 }
169
170 if (pkey->ameth == NULL) {
171 EVP_PKEY_CTX *pctx = EVP_MD_CTX_get_pkey_ctx(ctx);
172 OSSL_PARAM params[2];
173 unsigned char aid[128];
174 size_t aid_len = 0;
175
176 if (pctx == NULL
177 || !EVP_PKEY_CTX_IS_SIGNATURE_OP(pctx)) {
178 ERR_raise(ERR_LIB_ASN1, ASN1_R_CONTEXT_NOT_INITIALISED);
179 goto err;
180 }
181
182 params[0] =
183 OSSL_PARAM_construct_octet_string(OSSL_SIGNATURE_PARAM_ALGORITHM_ID,
184 aid, sizeof(aid));
185 params[1] = OSSL_PARAM_construct_end();
186
187 if (EVP_PKEY_CTX_get_params(pctx, params) <= 0)
188 goto err;
189
190 if ((aid_len = params[0].return_size) == 0) {
191 ERR_raise(ERR_LIB_ASN1, ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
192 goto err;
193 }
194
195 if (algor1 != NULL) {
196 const unsigned char *pp = aid;
197
198 if (d2i_X509_ALGOR(&algor1, &pp, aid_len) == NULL) {
199 ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
200 goto err;
201 }
202 }
203
204 if (algor2 != NULL) {
205 const unsigned char *pp = aid;
206
207 if (d2i_X509_ALGOR(&algor2, &pp, aid_len) == NULL) {
208 ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
209 goto err;
210 }
211 }
212
213 rv = 3;
214 } else if (pkey->ameth->item_sign) {
215 rv = pkey->ameth->item_sign(ctx, it, data, algor1, algor2, signature);
216 if (rv == 1)
217 outl = signature->length;
218 /*-
219 * Return value meanings:
220 * <=0: error.
221 * 1: method does everything.
222 * 2: carry on as normal.
223 * 3: ASN1 method sets algorithm identifiers: just sign.
224 */
225 if (rv <= 0)
226 ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
227 if (rv <= 1)
228 goto err;
229 } else {
230 rv = 2;
231 }
232
233 if (rv == 2) {
234 if (md == NULL) {
235 ERR_raise(ERR_LIB_ASN1, ASN1_R_CONTEXT_NOT_INITIALISED);
236 goto err;
237 }
238
239 pkey_id =
240 #ifndef OPENSSL_NO_SM2
241 EVP_PKEY_get_id(pkey) == NID_sm2 ? NID_sm2 :
242 #endif
243 pkey->ameth->pkey_id;
244
245 if (!OBJ_find_sigid_by_algs(&signid, EVP_MD_nid(md), pkey_id)) {
246 ERR_raise(ERR_LIB_ASN1, ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
247 goto err;
248 }
249
250 if (pkey->ameth->pkey_flags & ASN1_PKEY_SIGPARAM_NULL)
251 paramtype = V_ASN1_NULL;
252 else
253 paramtype = V_ASN1_UNDEF;
254
255 if (algor1)
256 X509_ALGOR_set0(algor1, OBJ_nid2obj(signid), paramtype, NULL);
257 if (algor2)
258 X509_ALGOR_set0(algor2, OBJ_nid2obj(signid), paramtype, NULL);
259
260 }
261
262 buf_len = ASN1_item_i2d(data, &buf_in, it);
263 if (buf_len <= 0) {
264 outl = 0;
265 ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
266 goto err;
267 }
268 inl = buf_len;
269 if (!EVP_DigestSign(ctx, NULL, &outll, buf_in, inl)) {
270 outl = 0;
271 ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
272 goto err;
273 }
274 outl = outll;
275 buf_out = OPENSSL_malloc(outll);
276 if (buf_in == NULL || buf_out == NULL) {
277 outl = 0;
278 ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
279 goto err;
280 }
281
282 if (!EVP_DigestSign(ctx, buf_out, &outl, buf_in, inl)) {
283 outl = 0;
284 ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
285 goto err;
286 }
287 OPENSSL_free(signature->data);
288 signature->data = buf_out;
289 buf_out = NULL;
290 signature->length = outl;
291 /*
292 * In the interests of compatibility, I'll make sure that the bit string
293 * has a 'not-used bits' value of 0
294 */
295 signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
296 signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;
297 err:
298 OPENSSL_clear_free((char *)buf_in, inl);
299 OPENSSL_clear_free((char *)buf_out, outll);
300 return outl;
301 }
302