1 /* crypto/rsa/rsa_sign.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 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. 8 * 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). 15 * 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. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 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)" 40 * 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 51 * SUCH DAMAGE. 52 * 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.] 57 */ 58 59 #include <stdio.h> 60 #include "cryptlib.h" 61 #include <openssl/bn.h> 62 #include <openssl/rsa.h> 63 #include <openssl/objects.h> 64 #include <openssl/x509.h> 65 66 /* Size of an SSL signature: MD5+SHA1 */ 67 #define SSL_SIG_LENGTH 36 68 69 int RSA_sign(int type, unsigned char *m, unsigned int m_len, 70 unsigned char *sigret, unsigned int *siglen, RSA *rsa) 71 { 72 X509_SIG sig; 73 ASN1_TYPE parameter; 74 int i,j,ret=1; 75 unsigned char *p,*s = NULL; 76 X509_ALGOR algor; 77 ASN1_OCTET_STRING digest; 78 if(rsa->flags & RSA_FLAG_SIGN_VER) 79 return rsa->meth->rsa_sign(type, m, m_len, sigret, siglen, rsa); 80 /* Special case: SSL signature, just check the length */ 81 if(type == NID_md5_sha1) { 82 if(m_len != SSL_SIG_LENGTH) { 83 RSAerr(RSA_F_RSA_SIGN,RSA_R_INVALID_MESSAGE_LENGTH); 84 return(0); 85 } 86 i = SSL_SIG_LENGTH; 87 s = m; 88 } else { 89 sig.algor= &algor; 90 sig.algor->algorithm=OBJ_nid2obj(type); 91 if (sig.algor->algorithm == NULL) 92 { 93 RSAerr(RSA_F_RSA_SIGN,RSA_R_UNKNOWN_ALGORITHM_TYPE); 94 return(0); 95 } 96 if (sig.algor->algorithm->length == 0) 97 { 98 RSAerr(RSA_F_RSA_SIGN,RSA_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD); 99 return(0); 100 } 101 parameter.type=V_ASN1_NULL; 102 parameter.value.ptr=NULL; 103 sig.algor->parameter= ¶meter; 104 105 sig.digest= &digest; 106 sig.digest->data=m; 107 sig.digest->length=m_len; 108 109 i=i2d_X509_SIG(&sig,NULL); 110 } 111 j=RSA_size(rsa); 112 if ((i-RSA_PKCS1_PADDING) > j) 113 { 114 RSAerr(RSA_F_RSA_SIGN,RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY); 115 return(0); 116 } 117 if(type != NID_md5_sha1) { 118 s=(unsigned char *)OPENSSL_malloc((unsigned int)j+1); 119 if (s == NULL) 120 { 121 RSAerr(RSA_F_RSA_SIGN,ERR_R_MALLOC_FAILURE); 122 return(0); 123 } 124 p=s; 125 i2d_X509_SIG(&sig,&p); 126 } 127 i=RSA_private_encrypt(i,s,sigret,rsa,RSA_PKCS1_PADDING); 128 if (i <= 0) 129 ret=0; 130 else 131 *siglen=i; 132 133 if(type != NID_md5_sha1) { 134 memset(s,0,(unsigned int)j+1); 135 OPENSSL_free(s); 136 } 137 return(ret); 138 } 139 140 int RSA_verify(int dtype, unsigned char *m, unsigned int m_len, 141 unsigned char *sigbuf, unsigned int siglen, RSA *rsa) 142 { 143 int i,ret=0,sigtype; 144 unsigned char *p,*s; 145 X509_SIG *sig=NULL; 146 147 if (siglen != (unsigned int)RSA_size(rsa)) 148 { 149 RSAerr(RSA_F_RSA_VERIFY,RSA_R_WRONG_SIGNATURE_LENGTH); 150 return(0); 151 } 152 153 if(rsa->flags & RSA_FLAG_SIGN_VER) 154 return rsa->meth->rsa_verify(dtype, m, m_len, sigbuf, siglen, rsa); 155 156 s=(unsigned char *)OPENSSL_malloc((unsigned int)siglen); 157 if (s == NULL) 158 { 159 RSAerr(RSA_F_RSA_VERIFY,ERR_R_MALLOC_FAILURE); 160 goto err; 161 } 162 if((dtype == NID_md5_sha1) && (m_len != SSL_SIG_LENGTH) ) { 163 RSAerr(RSA_F_RSA_VERIFY,RSA_R_INVALID_MESSAGE_LENGTH); 164 return(0); 165 } 166 i=RSA_public_decrypt((int)siglen,sigbuf,s,rsa,RSA_PKCS1_PADDING); 167 168 if (i <= 0) goto err; 169 170 /* Special case: SSL signature */ 171 if(dtype == NID_md5_sha1) { 172 if((i != SSL_SIG_LENGTH) || memcmp(s, m, SSL_SIG_LENGTH)) 173 RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE); 174 else ret = 1; 175 } else { 176 p=s; 177 sig=d2i_X509_SIG(NULL,&p,(long)i); 178 179 if (sig == NULL) goto err; 180 sigtype=OBJ_obj2nid(sig->algor->algorithm); 181 182 183 #ifdef RSA_DEBUG 184 /* put a backward compatibility flag in EAY */ 185 fprintf(stderr,"in(%s) expect(%s)\n",OBJ_nid2ln(sigtype), 186 OBJ_nid2ln(dtype)); 187 #endif 188 if (sigtype != dtype) 189 { 190 if (((dtype == NID_md5) && 191 (sigtype == NID_md5WithRSAEncryption)) || 192 ((dtype == NID_md2) && 193 (sigtype == NID_md2WithRSAEncryption))) 194 { 195 /* ok, we will let it through */ 196 #if !defined(NO_STDIO) && !defined(WIN16) 197 fprintf(stderr,"signature has problems, re-make with post SSLeay045\n"); 198 #endif 199 } 200 else 201 { 202 RSAerr(RSA_F_RSA_VERIFY, 203 RSA_R_ALGORITHM_MISMATCH); 204 goto err; 205 } 206 } 207 if ( ((unsigned int)sig->digest->length != m_len) || 208 (memcmp(m,sig->digest->data,m_len) != 0)) 209 { 210 RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE); 211 } 212 else 213 ret=1; 214 } 215 err: 216 if (sig != NULL) X509_SIG_free(sig); 217 memset(s,0,(unsigned int)siglen); 218 OPENSSL_free(s); 219 return(ret); 220 } 221 222