1 /* crypto/rsa/rsa_sign.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
61 #include <openssl/bn.h>
62 #include <openssl/rsa.h>
63 #include <openssl/objects.h>
64 #include <openssl/x509.h>
67 /* Size of an SSL signature: MD5+SHA1 */
68 #define SSL_SIG_LENGTH 36
70 int RSA_sign(int type
, const unsigned char *m
, unsigned int m_len
,
71 unsigned char *sigret
, unsigned int *siglen
, RSA
*rsa
)
76 unsigned char *p
, *tmps
= NULL
;
77 const unsigned char *s
= NULL
;
79 ASN1_OCTET_STRING digest
;
81 if (FIPS_mode() && !(rsa
->meth
->flags
& RSA_FLAG_FIPS_METHOD
)
82 && !(rsa
->flags
& RSA_FLAG_NON_FIPS_ALLOW
)) {
83 RSAerr(RSA_F_RSA_SIGN
, RSA_R_NON_FIPS_RSA_METHOD
);
87 if (rsa
->meth
->rsa_sign
) {
88 return rsa
->meth
->rsa_sign(type
, m
, m_len
, sigret
, siglen
, rsa
);
90 /* Special case: SSL signature, just check the length */
91 if (type
== NID_md5_sha1
) {
92 if (m_len
!= SSL_SIG_LENGTH
) {
93 RSAerr(RSA_F_RSA_SIGN
, RSA_R_INVALID_MESSAGE_LENGTH
);
100 sig
.algor
->algorithm
= OBJ_nid2obj(type
);
101 if (sig
.algor
->algorithm
== NULL
) {
102 RSAerr(RSA_F_RSA_SIGN
, RSA_R_UNKNOWN_ALGORITHM_TYPE
);
105 if (sig
.algor
->algorithm
->length
== 0) {
106 RSAerr(RSA_F_RSA_SIGN
,
107 RSA_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD
);
110 parameter
.type
= V_ASN1_NULL
;
111 parameter
.value
.ptr
= NULL
;
112 sig
.algor
->parameter
= ¶meter
;
114 sig
.digest
= &digest
;
115 sig
.digest
->data
= (unsigned char *)m
; /* TMP UGLY CAST */
116 sig
.digest
->length
= m_len
;
118 i
= i2d_X509_SIG(&sig
, NULL
);
121 if (i
> (j
- RSA_PKCS1_PADDING_SIZE
)) {
122 RSAerr(RSA_F_RSA_SIGN
, RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY
);
125 if (type
!= NID_md5_sha1
) {
126 tmps
= (unsigned char *)OPENSSL_malloc((unsigned int)j
+ 1);
128 RSAerr(RSA_F_RSA_SIGN
, ERR_R_MALLOC_FAILURE
);
132 i2d_X509_SIG(&sig
, &p
);
135 i
= RSA_private_encrypt(i
, s
, sigret
, rsa
, RSA_PKCS1_PADDING
);
141 if (type
!= NID_md5_sha1
) {
142 OPENSSL_cleanse(tmps
, (unsigned int)j
+ 1);
149 * Check DigestInfo structure does not contain extraneous data by reencoding
150 * using DER and checking encoding against original.
152 static int rsa_check_digestinfo(X509_SIG
*sig
, const unsigned char *dinfo
,
155 unsigned char *der
= NULL
;
158 derlen
= i2d_X509_SIG(sig
, &der
);
161 if (derlen
== dinfolen
&& !memcmp(dinfo
, der
, derlen
))
163 OPENSSL_cleanse(der
, derlen
);
168 int int_rsa_verify(int dtype
, const unsigned char *m
,
170 unsigned char *rm
, size_t *prm_len
,
171 const unsigned char *sigbuf
, size_t siglen
, RSA
*rsa
)
173 int i
, ret
= 0, sigtype
;
175 X509_SIG
*sig
= NULL
;
178 if (FIPS_mode() && !(rsa
->meth
->flags
& RSA_FLAG_FIPS_METHOD
)
179 && !(rsa
->flags
& RSA_FLAG_NON_FIPS_ALLOW
)) {
180 RSAerr(RSA_F_INT_RSA_VERIFY
, RSA_R_NON_FIPS_RSA_METHOD
);
185 if (siglen
!= (unsigned int)RSA_size(rsa
)) {
186 RSAerr(RSA_F_INT_RSA_VERIFY
, RSA_R_WRONG_SIGNATURE_LENGTH
);
190 if ((dtype
== NID_md5_sha1
) && rm
) {
191 i
= RSA_public_decrypt((int)siglen
,
192 sigbuf
, rm
, rsa
, RSA_PKCS1_PADDING
);
199 s
= (unsigned char *)OPENSSL_malloc((unsigned int)siglen
);
201 RSAerr(RSA_F_INT_RSA_VERIFY
, ERR_R_MALLOC_FAILURE
);
204 if ((dtype
== NID_md5_sha1
) && (m_len
!= SSL_SIG_LENGTH
)) {
205 RSAerr(RSA_F_INT_RSA_VERIFY
, RSA_R_INVALID_MESSAGE_LENGTH
);
208 i
= RSA_public_decrypt((int)siglen
, sigbuf
, s
, rsa
, RSA_PKCS1_PADDING
);
213 * Oddball MDC2 case: signature can be OCTET STRING. check for correct
214 * tag and length octets.
216 if (dtype
== NID_mdc2
&& i
== 18 && s
[0] == 0x04 && s
[1] == 0x10) {
218 memcpy(rm
, s
+ 2, 16);
221 } else if (memcmp(m
, s
+ 2, 16)) {
222 RSAerr(RSA_F_INT_RSA_VERIFY
, RSA_R_BAD_SIGNATURE
);
226 } else if (dtype
== NID_md5_sha1
) {
227 /* Special case: SSL signature */
228 if ((i
!= SSL_SIG_LENGTH
) || memcmp(s
, m
, SSL_SIG_LENGTH
))
229 RSAerr(RSA_F_INT_RSA_VERIFY
, RSA_R_BAD_SIGNATURE
);
233 const unsigned char *p
= s
;
234 sig
= d2i_X509_SIG(NULL
, &p
, (long)i
);
239 /* Excess data can be used to create forgeries */
240 if (p
!= s
+ i
|| !rsa_check_digestinfo(sig
, s
, i
)) {
241 RSAerr(RSA_F_INT_RSA_VERIFY
, RSA_R_BAD_SIGNATURE
);
246 * Parameters to the signature algorithm can also be used to create
249 if (sig
->algor
->parameter
250 && ASN1_TYPE_get(sig
->algor
->parameter
) != V_ASN1_NULL
) {
251 RSAerr(RSA_F_INT_RSA_VERIFY
, RSA_R_BAD_SIGNATURE
);
255 sigtype
= OBJ_obj2nid(sig
->algor
->algorithm
);
258 /* put a backward compatibility flag in EAY */
259 fprintf(stderr
, "in(%s) expect(%s)\n", OBJ_nid2ln(sigtype
),
262 if (sigtype
!= dtype
) {
263 RSAerr(RSA_F_INT_RSA_VERIFY
, RSA_R_ALGORITHM_MISMATCH
);
268 md
= EVP_get_digestbynid(dtype
);
269 if (md
&& (EVP_MD_size(md
) != sig
->digest
->length
))
270 RSAerr(RSA_F_INT_RSA_VERIFY
, RSA_R_INVALID_DIGEST_LENGTH
);
272 memcpy(rm
, sig
->digest
->data
, sig
->digest
->length
);
273 *prm_len
= sig
->digest
->length
;
276 } else if (((unsigned int)sig
->digest
->length
!= m_len
) ||
277 (memcmp(m
, sig
->digest
->data
, m_len
) != 0)) {
278 RSAerr(RSA_F_INT_RSA_VERIFY
, RSA_R_BAD_SIGNATURE
);
286 OPENSSL_cleanse(s
, (unsigned int)siglen
);
292 int RSA_verify(int dtype
, const unsigned char *m
, unsigned int m_len
,
293 const unsigned char *sigbuf
, unsigned int siglen
, RSA
*rsa
)
296 if (rsa
->meth
->rsa_verify
) {
297 return rsa
->meth
->rsa_verify(dtype
, m
, m_len
, sigbuf
, siglen
, rsa
);
300 return int_rsa_verify(dtype
, m
, m_len
, NULL
, NULL
, sigbuf
, siglen
, rsa
);