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) {
80 return rsa->meth->rsa_sign(type, m, m_len, sigret, siglen, rsa);
82 /* Special case: SSL signature, just check the length */
83 if (type == NID_md5_sha1) {
84 if (m_len != SSL_SIG_LENGTH) {
85 RSAerr(RSA_F_RSA_SIGN, RSA_R_INVALID_MESSAGE_LENGTH);
91 /* NB: in FIPS mode block anything that isn't a TLS signature */
93 if (FIPS_mode() && !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW)) {
94 RSAerr(RSA_F_RSA_SIGN, RSA_R_OPERATION_NOT_ALLOWED_IN_FIPS_MODE);
99 sig.algor->algorithm = OBJ_nid2obj(type);
100 if (sig.algor->algorithm == NULL) {
101 RSAerr(RSA_F_RSA_SIGN, RSA_R_UNKNOWN_ALGORITHM_TYPE);
104 if (sig.algor->algorithm->length == 0) {
105 RSAerr(RSA_F_RSA_SIGN,
106 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;
113 sig.digest = &digest;
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)) {
121 RSAerr(RSA_F_RSA_SIGN, RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);
124 if (type != NID_md5_sha1) {
125 tmps = (unsigned char *)OPENSSL_malloc((unsigned int)j + 1);
127 RSAerr(RSA_F_RSA_SIGN, ERR_R_MALLOC_FAILURE);
131 i2d_X509_SIG(&sig, &p);
135 /* Bypass algorithm blocking: this is allowed if we get this far */
136 i = rsa->meth->rsa_priv_enc(i, s, sigret, rsa, RSA_PKCS1_PADDING);
138 i = RSA_private_encrypt(i, s, sigret, rsa, RSA_PKCS1_PADDING);
145 if (type != NID_md5_sha1) {
146 OPENSSL_cleanse(tmps, (unsigned int)j + 1);
153 * Check DigestInfo structure does not contain extraneous data by reencoding
154 * using DER and checking encoding against original.
156 static int rsa_check_digestinfo(X509_SIG *sig, const unsigned char *dinfo,
159 unsigned char *der = NULL;
162 derlen = i2d_X509_SIG(sig, &der);
165 if (derlen == dinfolen && !memcmp(dinfo, der, derlen))
167 OPENSSL_cleanse(der, derlen);
172 int RSA_verify(int dtype, const unsigned char *m, unsigned int m_len,
173 unsigned char *sigbuf, unsigned int siglen, RSA *rsa)
175 int i, ret = 0, sigtype;
177 X509_SIG *sig = NULL;
179 if (siglen != (unsigned int)RSA_size(rsa)) {
180 RSAerr(RSA_F_RSA_VERIFY, RSA_R_WRONG_SIGNATURE_LENGTH);
184 if ((rsa->flags & RSA_FLAG_SIGN_VER) && rsa->meth->rsa_verify) {
185 return rsa->meth->rsa_verify(dtype, m, m_len, sigbuf, siglen, rsa);
188 s = (unsigned char *)OPENSSL_malloc((unsigned int)siglen);
190 RSAerr(RSA_F_RSA_VERIFY, ERR_R_MALLOC_FAILURE);
193 if (dtype == NID_md5_sha1) {
194 if (m_len != SSL_SIG_LENGTH) {
195 RSAerr(RSA_F_RSA_VERIFY, RSA_R_INVALID_MESSAGE_LENGTH);
199 /* NB: in FIPS mode block anything that isn't a TLS signature */
201 else if (FIPS_mode() && !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW)) {
202 RSAerr(RSA_F_RSA_VERIFY, RSA_R_OPERATION_NOT_ALLOWED_IN_FIPS_MODE);
205 /* Bypass algorithm blocking: this is allowed */
206 i = rsa->meth->rsa_pub_dec((int)siglen, sigbuf, s, rsa,
209 i = RSA_public_decrypt((int)siglen, sigbuf, s, rsa, RSA_PKCS1_PADDING);
215 /* Special case: SSL signature */
216 if (dtype == NID_md5_sha1) {
217 if ((i != SSL_SIG_LENGTH) || memcmp(s, m, SSL_SIG_LENGTH))
218 RSAerr(RSA_F_RSA_VERIFY, RSA_R_BAD_SIGNATURE);
222 const unsigned char *p = s;
223 sig = d2i_X509_SIG(NULL, &p, (long)i);
228 /* Excess data can be used to create forgeries */
229 if (p != s + i || !rsa_check_digestinfo(sig, s, i)) {
230 RSAerr(RSA_F_RSA_VERIFY, RSA_R_BAD_SIGNATURE);
235 * Parameters to the signature algorithm can also be used to create
238 if (sig->algor->parameter
239 && ASN1_TYPE_get(sig->algor->parameter) != V_ASN1_NULL) {
240 RSAerr(RSA_F_RSA_VERIFY, RSA_R_BAD_SIGNATURE);
244 sigtype = OBJ_obj2nid(sig->algor->algorithm);
247 /* put a backward compatibility flag in EAY */
248 fprintf(stderr, "in(%s) expect(%s)\n", OBJ_nid2ln(sigtype),
251 if (sigtype != dtype) {
252 if (((dtype == NID_md5) &&
253 (sigtype == NID_md5WithRSAEncryption)) ||
254 ((dtype == NID_md2) &&
255 (sigtype == NID_md2WithRSAEncryption))) {
256 /* ok, we will let it through */
257 #if !defined(OPENSSL_NO_STDIO) && !defined(OPENSSL_SYS_WIN16)
259 "signature has problems, re-make with post SSLeay045\n");
262 RSAerr(RSA_F_RSA_VERIFY, RSA_R_ALGORITHM_MISMATCH);
266 if (((unsigned int)sig->digest->length != m_len) ||
267 (memcmp(m, sig->digest->data, m_len) != 0)) {
268 RSAerr(RSA_F_RSA_VERIFY, RSA_R_BAD_SIGNATURE);
276 OPENSSL_cleanse(s, (unsigned int)siglen);