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d02b48c6 | 1 | /* crypto/asn1/a_verify.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
3 | * All rights reserved. |
4 | * | |
5 | * This package is an SSL implementation written | |
6 | * by Eric Young (eay@cryptsoft.com). | |
7 | * The implementation was written so as to conform with Netscapes SSL. | |
8 | * | |
9 | * This library is free for commercial and non-commercial use as long as | |
10 | * the following conditions are aheared to. The following conditions | |
11 | * apply to all code found in this distribution, be it the RC4, RSA, | |
12 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
13 | * included with this distribution is covered by the same copyright terms | |
14 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
15 | * | |
16 | * Copyright remains Eric Young's, and as such any Copyright notices in | |
17 | * the code are not to be removed. | |
18 | * If this package is used in a product, Eric Young should be given attribution | |
19 | * as the author of the parts of the library used. | |
20 | * This can be in the form of a textual message at program startup or | |
21 | * in documentation (online or textual) provided with the package. | |
22 | * | |
23 | * Redistribution and use in source and binary forms, with or without | |
24 | * modification, are permitted provided that the following conditions | |
25 | * are met: | |
26 | * 1. Redistributions of source code must retain the copyright | |
27 | * notice, this list of conditions and the following disclaimer. | |
28 | * 2. Redistributions in binary form must reproduce the above copyright | |
29 | * notice, this list of conditions and the following disclaimer in the | |
30 | * documentation and/or other materials provided with the distribution. | |
31 | * 3. All advertising materials mentioning features or use of this software | |
32 | * must display the following acknowledgement: | |
33 | * "This product includes cryptographic software written by | |
34 | * Eric Young (eay@cryptsoft.com)" | |
35 | * The word 'cryptographic' can be left out if the rouines from the library | |
36 | * being used are not cryptographic related :-). | |
37 | * 4. If you include any Windows specific code (or a derivative thereof) from | |
38 | * the apps directory (application code) you must include an acknowledgement: | |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
40 | * | |
41 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND | |
42 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
43 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
44 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
45 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
46 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
47 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
49 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
50 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
51 | * SUCH DAMAGE. | |
52 | * | |
53 | * The licence and distribution terms for any publically available version or | |
54 | * derivative of this code cannot be changed. i.e. this code cannot simply be | |
55 | * copied and put under another distribution licence | |
56 | * [including the GNU Public Licence.] | |
57 | */ | |
58 | ||
59 | #include <stdio.h> | |
60 | #include <time.h> | |
d02b48c6 RE |
61 | |
62 | #include "cryptlib.h" | |
ee1d9ec0 | 63 | #include "asn1_locl.h" |
17f389bb AP |
64 | |
65 | #ifndef NO_SYS_TYPES_H | |
66 | # include <sys/types.h> | |
67 | #endif | |
68 | ||
ec577822 BM |
69 | #include <openssl/bn.h> |
70 | #include <openssl/x509.h> | |
71 | #include <openssl/objects.h> | |
72 | #include <openssl/buffer.h> | |
73 | #include <openssl/evp.h> | |
d02b48c6 | 74 | |
73e92de5 DSH |
75 | #ifndef NO_ASN1_OLD |
76 | ||
8bb826ee | 77 | int ASN1_verify(i2d_of_void *i2d, X509_ALGOR *a, ASN1_BIT_STRING *signature, |
41a15c4f | 78 | char *data, EVP_PKEY *pkey) |
d02b48c6 RE |
79 | { |
80 | EVP_MD_CTX ctx; | |
e778802f | 81 | const EVP_MD *type; |
d02b48c6 RE |
82 | unsigned char *p,*buf_in=NULL; |
83 | int ret= -1,i,inl; | |
84 | ||
dbad1690 | 85 | EVP_MD_CTX_init(&ctx); |
d02b48c6 RE |
86 | i=OBJ_obj2nid(a->algorithm); |
87 | type=EVP_get_digestbyname(OBJ_nid2sn(i)); | |
88 | if (type == NULL) | |
89 | { | |
90 | ASN1err(ASN1_F_ASN1_VERIFY,ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM); | |
91 | goto err; | |
92 | } | |
85cfc188 DSH |
93 | |
94 | if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) | |
95 | { | |
96 | ASN1err(ASN1_F_ASN1_VERIFY, ASN1_R_INVALID_BIT_STRING_BITS_LEFT); | |
97 | goto err; | |
98 | } | |
d02b48c6 RE |
99 | |
100 | inl=i2d(data,NULL); | |
26a3a48d | 101 | buf_in=OPENSSL_malloc((unsigned int)inl); |
d02b48c6 RE |
102 | if (buf_in == NULL) |
103 | { | |
104 | ASN1err(ASN1_F_ASN1_VERIFY,ERR_R_MALLOC_FAILURE); | |
105 | goto err; | |
106 | } | |
107 | p=buf_in; | |
108 | ||
109 | i2d(data,&p); | |
24d7159a DSH |
110 | if (!EVP_VerifyInit_ex(&ctx,type, NULL) |
111 | || !EVP_VerifyUpdate(&ctx,(unsigned char *)buf_in,inl)) | |
112 | { | |
113 | ASN1err(ASN1_F_ASN1_VERIFY,ERR_R_EVP_LIB); | |
114 | ret=0; | |
115 | goto err; | |
116 | } | |
d02b48c6 | 117 | |
4579924b | 118 | OPENSSL_cleanse(buf_in,(unsigned int)inl); |
26a3a48d | 119 | OPENSSL_free(buf_in); |
d02b48c6 RE |
120 | |
121 | if (EVP_VerifyFinal(&ctx,(unsigned char *)signature->data, | |
122 | (unsigned int)signature->length,pkey) <= 0) | |
123 | { | |
124 | ASN1err(ASN1_F_ASN1_VERIFY,ERR_R_EVP_LIB); | |
125 | ret=0; | |
126 | goto err; | |
127 | } | |
128 | /* we don't need to zero the 'ctx' because we just checked | |
129 | * public information */ | |
130 | /* memset(&ctx,0,sizeof(ctx)); */ | |
131 | ret=1; | |
132 | err: | |
dbad1690 | 133 | EVP_MD_CTX_cleanup(&ctx); |
d02b48c6 RE |
134 | return(ret); |
135 | } | |
09ab755c | 136 | |
73e92de5 DSH |
137 | #endif |
138 | ||
09ab755c | 139 | |
9309ea66 DSH |
140 | int ASN1_item_verify(const ASN1_ITEM *it, X509_ALGOR *a, |
141 | ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey) | |
09ab755c DSH |
142 | { |
143 | EVP_MD_CTX ctx; | |
09ab755c | 144 | unsigned char *buf_in=NULL; |
ee1d9ec0 | 145 | int ret= -1,inl; |
09ab755c | 146 | |
ee1d9ec0 DSH |
147 | int mdnid, pknid; |
148 | ||
e9b4b8af DSH |
149 | if (!pkey) |
150 | { | |
151 | ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_PASSED_NULL_PARAMETER); | |
152 | return -1; | |
153 | } | |
154 | ||
85cfc188 DSH |
155 | if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) |
156 | { | |
157 | ASN1err(ASN1_F_ASN1_VERIFY, ASN1_R_INVALID_BIT_STRING_BITS_LEFT); | |
158 | return -1; | |
159 | } | |
160 | ||
d326582c | 161 | EVP_MD_CTX_init(&ctx); |
ee1d9ec0 | 162 | |
d326582c | 163 | /* Convert signature OID into digest and public key OIDs */ |
ee1d9ec0 DSH |
164 | if (!OBJ_find_sigid_algs(OBJ_obj2nid(a->algorithm), &mdnid, &pknid)) |
165 | { | |
166 | ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM); | |
167 | goto err; | |
168 | } | |
9309ea66 | 169 | if (mdnid == NID_undef) |
09ab755c | 170 | { |
9309ea66 DSH |
171 | if (!pkey->ameth || !pkey->ameth->item_verify) |
172 | { | |
173 | ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM); | |
174 | goto err; | |
175 | } | |
176 | ret = pkey->ameth->item_verify(&ctx, it, asn, a, | |
177 | signature, pkey); | |
178 | /* Return value of 2 means carry on, anything else means we | |
179 | * exit straight away: either a fatal error of the underlying | |
180 | * verification routine handles all verification. | |
181 | */ | |
182 | if (ret != 2) | |
183 | goto err; | |
184 | ret = -1; | |
09ab755c | 185 | } |
9309ea66 | 186 | else |
ee1d9ec0 | 187 | { |
9309ea66 DSH |
188 | const EVP_MD *type; |
189 | type=EVP_get_digestbynid(mdnid); | |
190 | if (type == NULL) | |
191 | { | |
192 | ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM); | |
193 | goto err; | |
194 | } | |
195 | ||
196 | /* Check public key OID matches public key type */ | |
197 | if (EVP_PKEY_type(pknid) != pkey->ameth->pkey_id) | |
198 | { | |
199 | ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_WRONG_PUBLIC_KEY_TYPE); | |
200 | goto err; | |
201 | } | |
202 | ||
203 | if (!EVP_DigestVerifyInit(&ctx, NULL, type, NULL, pkey)) | |
204 | { | |
205 | ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB); | |
206 | ret=0; | |
207 | goto err; | |
208 | } | |
ee1d9ec0 | 209 | |
2deadf16 DSH |
210 | } |
211 | ||
09ab755c DSH |
212 | inl = ASN1_item_i2d(asn, &buf_in, it); |
213 | ||
214 | if (buf_in == NULL) | |
215 | { | |
fbeaa3c4 | 216 | ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_MALLOC_FAILURE); |
09ab755c DSH |
217 | goto err; |
218 | } | |
219 | ||
9309ea66 | 220 | if (!EVP_DigestVerifyUpdate(&ctx,buf_in,inl)) |
24d7159a DSH |
221 | { |
222 | ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB); | |
223 | ret=0; | |
224 | goto err; | |
225 | } | |
09ab755c | 226 | |
4579924b | 227 | OPENSSL_cleanse(buf_in,(unsigned int)inl); |
09ab755c DSH |
228 | OPENSSL_free(buf_in); |
229 | ||
9309ea66 DSH |
230 | if (EVP_DigestVerifyFinal(&ctx,signature->data, |
231 | (size_t)signature->length) <= 0) | |
09ab755c | 232 | { |
fbeaa3c4 | 233 | ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB); |
09ab755c DSH |
234 | ret=0; |
235 | goto err; | |
236 | } | |
237 | /* we don't need to zero the 'ctx' because we just checked | |
238 | * public information */ | |
239 | /* memset(&ctx,0,sizeof(ctx)); */ | |
240 | ret=1; | |
241 | err: | |
dbad1690 | 242 | EVP_MD_CTX_cleanup(&ctx); |
09ab755c DSH |
243 | return(ret); |
244 | } | |
245 | ||
246 |