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 #ifndef OPENSSL_NO_ENGINE
83 if((rsa->flags & RSA_FLAG_SIGN_VER)
84 && ENGINE_get_RSA(rsa->engine)->rsa_sign)
85 return ENGINE_get_RSA(rsa->engine)->rsa_sign(type,
86 m, m_len, sigret, siglen, rsa);
88 /* Special case: SSL signature, just check the length */
89 if(type == NID_md5_sha1) {
90 if(m_len != SSL_SIG_LENGTH) {
91 RSAerr(RSA_F_RSA_SIGN,RSA_R_INVALID_MESSAGE_LENGTH);
98 sig.algor->algorithm=OBJ_nid2obj(type);
99 if (sig.algor->algorithm == NULL)
101 RSAerr(RSA_F_RSA_SIGN,RSA_R_UNKNOWN_ALGORITHM_TYPE);
104 if (sig.algor->algorithm->length == 0)
106 RSAerr(RSA_F_RSA_SIGN,RSA_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);
109 parameter.type=V_ASN1_NULL;
110 parameter.value.ptr=NULL;
111 sig.algor->parameter= ¶meter;
114 sig.digest->data=(unsigned char *)m; /* TMP UGLY CAST */
115 sig.digest->length=m_len;
117 i=i2d_X509_SIG(&sig,NULL);
120 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);
129 RSAerr(RSA_F_RSA_SIGN,ERR_R_MALLOC_FAILURE);
133 i2d_X509_SIG(&sig,&p);
136 i=RSA_private_encrypt(i,s,sigret,rsa,RSA_PKCS1_PADDING);
142 if(type != NID_md5_sha1) {
143 OPENSSL_cleanse(tmps,(unsigned int)j+1);
149 int RSA_verify(int dtype, const unsigned char *m, unsigned int m_len,
150 unsigned char *sigbuf, unsigned int siglen, RSA *rsa)
156 if (siglen != (unsigned int)RSA_size(rsa))
158 RSAerr(RSA_F_RSA_VERIFY,RSA_R_WRONG_SIGNATURE_LENGTH);
162 #ifndef OPENSSL_NO_ENGINE
163 if((rsa->flags & RSA_FLAG_SIGN_VER)
164 && ENGINE_get_RSA(rsa->engine)->rsa_verify)
165 return ENGINE_get_RSA(rsa->engine)->rsa_verify(dtype,
166 m, m_len, sigbuf, siglen, rsa);
169 s=(unsigned char *)OPENSSL_malloc((unsigned int)siglen);
172 RSAerr(RSA_F_RSA_VERIFY,ERR_R_MALLOC_FAILURE);
175 if((dtype == NID_md5_sha1) && (m_len != SSL_SIG_LENGTH) ) {
176 RSAerr(RSA_F_RSA_VERIFY,RSA_R_INVALID_MESSAGE_LENGTH);
179 i=RSA_public_decrypt((int)siglen,sigbuf,s,rsa,RSA_PKCS1_PADDING);
181 if (i <= 0) goto err;
183 /* Special case: SSL signature */
184 if(dtype == NID_md5_sha1) {
185 if((i != SSL_SIG_LENGTH) || memcmp(s, m, SSL_SIG_LENGTH))
186 RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
190 sig=d2i_X509_SIG(NULL,&p,(long)i);
192 if (sig == NULL) goto err;
193 sigtype=OBJ_obj2nid(sig->algor->algorithm);
197 /* put a backward compatibility flag in EAY */
198 fprintf(stderr,"in(%s) expect(%s)\n",OBJ_nid2ln(sigtype),
201 if (sigtype != dtype)
203 if (((dtype == NID_md5) &&
204 (sigtype == NID_md5WithRSAEncryption)) ||
205 ((dtype == NID_md2) &&
206 (sigtype == NID_md2WithRSAEncryption)))
208 /* ok, we will let it through */
209 #if !defined(OPENSSL_NO_STDIO) && !defined(OPENSSL_SYS_WIN16)
210 fprintf(stderr,"signature has problems, re-make with post SSLeay045\n");
215 RSAerr(RSA_F_RSA_VERIFY,
216 RSA_R_ALGORITHM_MISMATCH);
220 if ( ((unsigned int)sig->digest->length != m_len) ||
221 (memcmp(m,sig->digest->data,m_len) != 0))
223 RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
229 if (sig != NULL) X509_SIG_free(sig);
230 OPENSSL_cleanse(s,(unsigned int)siglen);