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 #ifndef OPENSSL_NO_ENGINE 66 #include <openssl/engine.h> 67 #endif 68 69 /* Size of an SSL signature: MD5+SHA1 */ 70 #define SSL_SIG_LENGTH 36 71 72 int RSA_sign(int type, const unsigned char *m, unsigned int m_len, 73 unsigned char *sigret, unsigned int *siglen, RSA *rsa) 74 { 75 X509_SIG sig; 76 ASN1_TYPE parameter; 77 int i,j,ret=1; 78 unsigned char *p, *tmps = NULL; 79 const unsigned char *s = NULL; 80 X509_ALGOR algor; 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); 87 #endif 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); 92 return(0); 93 } 94 i = SSL_SIG_LENGTH; 95 s = m; 96 } else { 97 sig.algor= &algor; 98 sig.algor->algorithm=OBJ_nid2obj(type); 99 if (sig.algor->algorithm == NULL) 100 { 101 RSAerr(RSA_F_RSA_SIGN,RSA_R_UNKNOWN_ALGORITHM_TYPE); 102 return(0); 103 } 104 if (sig.algor->algorithm->length == 0) 105 { 106 RSAerr(RSA_F_RSA_SIGN,RSA_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD); 107 return(0); 108 } 109 parameter.type=V_ASN1_NULL; 110 parameter.value.ptr=NULL; 111 sig.algor->parameter= ¶meter; 112 113 sig.digest= &digest; 114 sig.digest->data=(unsigned char *)m; /* TMP UGLY CAST */ 115 sig.digest->length=m_len; 116 117 i=i2d_X509_SIG(&sig,NULL); 118 } 119 j=RSA_size(rsa); 120 if (i > (j-RSA_PKCS1_PADDING_SIZE)) 121 { 122 RSAerr(RSA_F_RSA_SIGN,RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY); 123 return(0); 124 } 125 if(type != NID_md5_sha1) { 126 tmps=(unsigned char *)OPENSSL_malloc((unsigned int)j+1); 127 if (tmps == NULL) 128 { 129 RSAerr(RSA_F_RSA_SIGN,ERR_R_MALLOC_FAILURE); 130 return(0); 131 } 132 p=tmps; 133 i2d_X509_SIG(&sig,&p); 134 s=tmps; 135 } 136 i=RSA_private_encrypt(i,s,sigret,rsa,RSA_PKCS1_PADDING); 137 if (i <= 0) 138 ret=0; 139 else 140 *siglen=i; 141 142 if(type != NID_md5_sha1) { 143 OPENSSL_cleanse(tmps,(unsigned int)j+1); 144 OPENSSL_free(tmps); 145 } 146 return(ret); 147 } 148 149 int RSA_verify(int dtype, const unsigned char *m, unsigned int m_len, 150 unsigned char *sigbuf, unsigned int siglen, RSA *rsa) 151 { 152 int i,ret=0,sigtype; 153 unsigned char *p,*s; 154 X509_SIG *sig=NULL; 155 156 if (siglen != (unsigned int)RSA_size(rsa)) 157 { 158 RSAerr(RSA_F_RSA_VERIFY,RSA_R_WRONG_SIGNATURE_LENGTH); 159 return(0); 160 } 161 162 #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); 167 #endif 168 169 s=(unsigned char *)OPENSSL_malloc((unsigned int)siglen); 170 if (s == NULL) 171 { 172 RSAerr(RSA_F_RSA_VERIFY,ERR_R_MALLOC_FAILURE); 173 goto err; 174 } 175 if((dtype == NID_md5_sha1) && (m_len != SSL_SIG_LENGTH) ) { 176 RSAerr(RSA_F_RSA_VERIFY,RSA_R_INVALID_MESSAGE_LENGTH); 177 return(0); 178 } 179 i=RSA_public_decrypt((int)siglen,sigbuf,s,rsa,RSA_PKCS1_PADDING); 180 181 if (i <= 0) goto err; 182 183 /* 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); 187 else ret = 1; 188 } else { 189 p=s; 190 sig=d2i_X509_SIG(NULL,&p,(long)i); 191 192 if (sig == NULL) goto err; 193 sigtype=OBJ_obj2nid(sig->algor->algorithm); 194 195 196 #ifdef RSA_DEBUG 197 /* put a backward compatibility flag in EAY */ 198 fprintf(stderr,"in(%s) expect(%s)\n",OBJ_nid2ln(sigtype), 199 OBJ_nid2ln(dtype)); 200 #endif 201 if (sigtype != dtype) 202 { 203 if (((dtype == NID_md5) && 204 (sigtype == NID_md5WithRSAEncryption)) || 205 ((dtype == NID_md2) && 206 (sigtype == NID_md2WithRSAEncryption))) 207 { 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"); 211 #endif 212 } 213 else 214 { 215 RSAerr(RSA_F_RSA_VERIFY, 216 RSA_R_ALGORITHM_MISMATCH); 217 goto err; 218 } 219 } 220 if ( ((unsigned int)sig->digest->length != m_len) || 221 (memcmp(m,sig->digest->data,m_len) != 0)) 222 { 223 RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE); 224 } 225 else 226 ret=1; 227 } 228 err: 229 if (sig != NULL) X509_SIG_free(sig); 230 OPENSSL_cleanse(s,(unsigned int)siglen); 231 OPENSSL_free(s); 232 return(ret); 233 } 234 235