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>
65 #ifndef OPENSSL_NO_ENGINE
66 #include <openssl/engine.h>
69 /* Size of an SSL signature: MD5+SHA1 */
70 #define SSL_SIG_LENGTH 36
72 int RSA_sign(int type, const unsigned char *m, unsigned int m_len,
73 unsigned char *sigret, unsigned int *siglen, RSA *rsa)
78 unsigned char *p, *tmps = NULL;
79 const unsigned char *s = NULL;
81 ASN1_OCTET_STRING digest;
82 if(rsa->flags & RSA_FLAG_SIGN_VER)
84 #ifndef OPENSSL_NO_ENGINE
85 if(ENGINE_get_RSA(rsa->engine)->rsa_sign)
86 return ENGINE_get_RSA(rsa->engine)->rsa_sign(type,
87 m, m_len, sigret, siglen, rsa);
89 return rsa->meth->rsa_sign(type, m, m_len,
92 /* Special case: SSL signature, just check the length */
93 if(type == NID_md5_sha1) {
94 if(m_len != SSL_SIG_LENGTH) {
95 RSAerr(RSA_F_RSA_SIGN,RSA_R_INVALID_MESSAGE_LENGTH);
102 sig.algor->algorithm=OBJ_nid2obj(type);
103 if (sig.algor->algorithm == NULL)
105 RSAerr(RSA_F_RSA_SIGN,RSA_R_UNKNOWN_ALGORITHM_TYPE);
108 if (sig.algor->algorithm->length == 0)
110 RSAerr(RSA_F_RSA_SIGN,RSA_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);
113 parameter.type=V_ASN1_NULL;
114 parameter.value.ptr=NULL;
115 sig.algor->parameter= ¶meter;
118 sig.digest->data=(unsigned char *)m; /* TMP UGLY CAST */
119 sig.digest->length=m_len;
121 i=i2d_X509_SIG(&sig,NULL);
124 if (i > (j-RSA_PKCS1_PADDING_SIZE))
126 RSAerr(RSA_F_RSA_SIGN,RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);
129 if(type != NID_md5_sha1) {
130 tmps=(unsigned char *)OPENSSL_malloc((unsigned int)j+1);
133 RSAerr(RSA_F_RSA_SIGN,ERR_R_MALLOC_FAILURE);
137 i2d_X509_SIG(&sig,&p);
140 i=RSA_private_encrypt(i,s,sigret,rsa,RSA_PKCS1_PADDING);
146 if(type != NID_md5_sha1) {
147 OPENSSL_cleanse(tmps,(unsigned int)j+1);
153 int RSA_verify(int dtype, const unsigned char *m, unsigned int m_len,
154 unsigned char *sigbuf, unsigned int siglen, RSA *rsa)
160 if (siglen != (unsigned int)RSA_size(rsa))
162 RSAerr(RSA_F_RSA_VERIFY,RSA_R_WRONG_SIGNATURE_LENGTH);
166 if(rsa->flags & RSA_FLAG_SIGN_VER)
168 #ifndef OPENSSL_NO_ENGINE
169 if(ENGINE_get_RSA(rsa->engine)->rsa_verify)
170 return ENGINE_get_RSA(rsa->engine)->rsa_verify(dtype,
171 m, m_len, sigbuf, siglen, rsa);
173 return rsa->meth->rsa_verify(dtype, m, m_len,
174 sigbuf, siglen, rsa);
177 s=(unsigned char *)OPENSSL_malloc((unsigned int)siglen);
180 RSAerr(RSA_F_RSA_VERIFY,ERR_R_MALLOC_FAILURE);
183 if((dtype == NID_md5_sha1) && (m_len != SSL_SIG_LENGTH) ) {
184 RSAerr(RSA_F_RSA_VERIFY,RSA_R_INVALID_MESSAGE_LENGTH);
187 i=RSA_public_decrypt((int)siglen,sigbuf,s,rsa,RSA_PKCS1_PADDING);
189 if (i <= 0) goto err;
191 /* Special case: SSL signature */
192 if(dtype == NID_md5_sha1) {
193 if((i != SSL_SIG_LENGTH) || memcmp(s, m, SSL_SIG_LENGTH))
194 RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
198 sig=d2i_X509_SIG(NULL,&p,(long)i);
200 if (sig == NULL) goto err;
201 sigtype=OBJ_obj2nid(sig->algor->algorithm);
205 /* put a backward compatibility flag in EAY */
206 fprintf(stderr,"in(%s) expect(%s)\n",OBJ_nid2ln(sigtype),
209 if (sigtype != dtype)
211 if (((dtype == NID_md5) &&
212 (sigtype == NID_md5WithRSAEncryption)) ||
213 ((dtype == NID_md2) &&
214 (sigtype == NID_md2WithRSAEncryption)))
216 /* ok, we will let it through */
217 #if !defined(OPENSSL_NO_STDIO) && !defined(OPENSSL_SYS_WIN16)
218 fprintf(stderr,"signature has problems, re-make with post SSLeay045\n");
223 RSAerr(RSA_F_RSA_VERIFY,
224 RSA_R_ALGORITHM_MISMATCH);
228 if ( ((unsigned int)sig->digest->length != m_len) ||
229 (memcmp(m,sig->digest->data,m_len) != 0))
231 RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
237 if (sig != NULL) X509_SIG_free(sig);
238 OPENSSL_cleanse(s,(unsigned int)siglen);