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);
93 /* NB: in FIPS mode block anything that isn't a TLS signature */
95 if(FIPS_mode() && !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW))
97 RSAerr(RSA_F_RSA_SIGN, RSA_R_OPERATION_NOT_ALLOWED_IN_FIPS_MODE);
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);
141 /* Bypass algorithm blocking: this is allowed if we get this far */
142 i=rsa->meth->rsa_priv_enc(i,s,sigret,rsa,RSA_PKCS1_PADDING);
144 i=RSA_private_encrypt(i,s,sigret,rsa,RSA_PKCS1_PADDING);
151 if(type != NID_md5_sha1) {
152 OPENSSL_cleanse(tmps,(unsigned int)j+1);
158 int RSA_verify(int dtype, const unsigned char *m, unsigned int m_len,
159 unsigned char *sigbuf, unsigned int siglen, RSA *rsa)
165 if (siglen != (unsigned int)RSA_size(rsa))
167 RSAerr(RSA_F_RSA_VERIFY,RSA_R_WRONG_SIGNATURE_LENGTH);
171 if((rsa->flags & RSA_FLAG_SIGN_VER) && rsa->meth->rsa_verify)
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)
185 if (m_len != SSL_SIG_LENGTH)
187 RSAerr(RSA_F_RSA_VERIFY,RSA_R_INVALID_MESSAGE_LENGTH);
191 /* NB: in FIPS mode block anything that isn't a TLS signature */
193 else if(FIPS_mode() && !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW))
195 RSAerr(RSA_F_RSA_VERIFY, RSA_R_OPERATION_NOT_ALLOWED_IN_FIPS_MODE);
198 /* Bypass algorithm blocking: this is allowed */
199 i=rsa->meth->rsa_pub_dec((int)siglen,sigbuf,s,rsa,RSA_PKCS1_PADDING);
201 i=RSA_public_decrypt((int)siglen,sigbuf,s,rsa,RSA_PKCS1_PADDING);
204 if (i <= 0) goto err;
206 /* Special case: SSL signature */
207 if(dtype == NID_md5_sha1) {
208 if((i != SSL_SIG_LENGTH) || memcmp(s, m, SSL_SIG_LENGTH))
209 RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
212 const unsigned char *p=s;
213 sig=d2i_X509_SIG(NULL,&p,(long)i);
215 if (sig == NULL) goto err;
217 /* Excess data can be used to create forgeries */
220 RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
224 /* Parameters to the signature algorithm can also be used to
226 if(sig->algor->parameter
227 && ASN1_TYPE_get(sig->algor->parameter) != V_ASN1_NULL)
229 RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
233 sigtype=OBJ_obj2nid(sig->algor->algorithm);
237 /* put a backward compatibility flag in EAY */
238 fprintf(stderr,"in(%s) expect(%s)\n",OBJ_nid2ln(sigtype),
241 if (sigtype != dtype)
243 if (((dtype == NID_md5) &&
244 (sigtype == NID_md5WithRSAEncryption)) ||
245 ((dtype == NID_md2) &&
246 (sigtype == NID_md2WithRSAEncryption)))
248 /* ok, we will let it through */
249 #if !defined(OPENSSL_NO_STDIO) && !defined(OPENSSL_SYS_WIN16)
250 fprintf(stderr,"signature has problems, re-make with post SSLeay045\n");
255 RSAerr(RSA_F_RSA_VERIFY,
256 RSA_R_ALGORITHM_MISMATCH);
260 if ( ((unsigned int)sig->digest->length != m_len) ||
261 (memcmp(m,sig->digest->data,m_len) != 0))
263 RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
269 if (sig != NULL) X509_SIG_free(sig);
272 OPENSSL_cleanse(s,(unsigned int)siglen);