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>
66 /* Size of an SSL signature: MD5+SHA1 */
67 #define SSL_SIG_LENGTH 36
69 int RSA_sign(int type
, const unsigned char *m
, unsigned int m_len
,
70 unsigned char *sigret
, unsigned int *siglen
, RSA
*rsa
)
75 unsigned char *p
, *tmps
= NULL
;
76 const unsigned char *s
= NULL
;
78 ASN1_OCTET_STRING digest
;
79 if((rsa
->flags
& RSA_FLAG_SIGN_VER
) && rsa
->meth
->rsa_sign
)
81 return rsa
->meth
->rsa_sign(type
, m
, m_len
,
84 /* Special case: SSL signature, just check the length */
85 if(type
== NID_md5_sha1
) {
86 if(m_len
!= SSL_SIG_LENGTH
) {
87 RSAerr(RSA_F_RSA_SIGN
,RSA_R_INVALID_MESSAGE_LENGTH
);
94 sig
.algor
->algorithm
=OBJ_nid2obj(type
);
95 if (sig
.algor
->algorithm
== NULL
)
97 RSAerr(RSA_F_RSA_SIGN
,RSA_R_UNKNOWN_ALGORITHM_TYPE
);
100 if (sig
.algor
->algorithm
->length
== 0)
102 RSAerr(RSA_F_RSA_SIGN
,RSA_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD
);
105 parameter
.type
=V_ASN1_NULL
;
106 parameter
.value
.ptr
=NULL
;
107 sig
.algor
->parameter
= ¶meter
;
110 sig
.digest
->data
=(unsigned char *)m
; /* TMP UGLY CAST */
111 sig
.digest
->length
=m_len
;
113 i
=i2d_X509_SIG(&sig
,NULL
);
116 if (i
> (j
-RSA_PKCS1_PADDING_SIZE
))
118 RSAerr(RSA_F_RSA_SIGN
,RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY
);
121 if(type
!= NID_md5_sha1
) {
122 tmps
=(unsigned char *)OPENSSL_malloc((unsigned int)j
+1);
125 RSAerr(RSA_F_RSA_SIGN
,ERR_R_MALLOC_FAILURE
);
129 i2d_X509_SIG(&sig
,&p
);
132 i
=RSA_private_encrypt(i
,s
,sigret
,rsa
,RSA_PKCS1_PADDING
);
138 if(type
!= NID_md5_sha1
) {
139 OPENSSL_cleanse(tmps
,(unsigned int)j
+1);
145 int RSA_verify(int dtype
, const unsigned char *m
, unsigned int m_len
,
146 unsigned char *sigbuf
, unsigned int siglen
, RSA
*rsa
)
152 if (siglen
!= (unsigned int)RSA_size(rsa
))
154 RSAerr(RSA_F_RSA_VERIFY
,RSA_R_WRONG_SIGNATURE_LENGTH
);
158 if((rsa
->flags
& RSA_FLAG_SIGN_VER
) && rsa
->meth
->rsa_verify
)
160 return rsa
->meth
->rsa_verify(dtype
, m
, m_len
,
161 sigbuf
, siglen
, rsa
);
164 s
=(unsigned char *)OPENSSL_malloc((unsigned int)siglen
);
167 RSAerr(RSA_F_RSA_VERIFY
,ERR_R_MALLOC_FAILURE
);
170 if((dtype
== NID_md5_sha1
) && (m_len
!= SSL_SIG_LENGTH
) ) {
171 RSAerr(RSA_F_RSA_VERIFY
,RSA_R_INVALID_MESSAGE_LENGTH
);
174 i
=RSA_public_decrypt((int)siglen
,sigbuf
,s
,rsa
,RSA_PKCS1_PADDING
);
176 if (i
<= 0) goto err
;
178 /* Special case: SSL signature */
179 if(dtype
== NID_md5_sha1
) {
180 if((i
!= SSL_SIG_LENGTH
) || memcmp(s
, m
, SSL_SIG_LENGTH
))
181 RSAerr(RSA_F_RSA_VERIFY
,RSA_R_BAD_SIGNATURE
);
185 sig
=d2i_X509_SIG(NULL
,&p
,(long)i
);
187 if (sig
== NULL
) goto err
;
188 sigtype
=OBJ_obj2nid(sig
->algor
->algorithm
);
192 /* put a backward compatibility flag in EAY */
193 fprintf(stderr
,"in(%s) expect(%s)\n",OBJ_nid2ln(sigtype
),
196 if (sigtype
!= dtype
)
198 if (((dtype
== NID_md5
) &&
199 (sigtype
== NID_md5WithRSAEncryption
)) ||
200 ((dtype
== NID_md2
) &&
201 (sigtype
== NID_md2WithRSAEncryption
)))
203 /* ok, we will let it through */
204 #if !defined(OPENSSL_NO_STDIO) && !defined(OPENSSL_SYS_WIN16)
205 fprintf(stderr
,"signature has problems, re-make with post SSLeay045\n");
210 RSAerr(RSA_F_RSA_VERIFY
,
211 RSA_R_ALGORITHM_MISMATCH
);
215 if ( ((unsigned int)sig
->digest
->length
!= m_len
) ||
216 (memcmp(m
,sig
->digest
->data
,m_len
) != 0))
218 RSAerr(RSA_F_RSA_VERIFY
,RSA_R_BAD_SIGNATURE
);
224 if (sig
!= NULL
) X509_SIG_free(sig
);
225 OPENSSL_cleanse(s
,(unsigned int)siglen
);