Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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 | #include "rsa_locl.h" |
| 66 | |
| 67 | /* Size of an SSL signature: MD5+SHA1 */ |
| 68 | #define SSL_SIG_LENGTH 36 |
| 69 | |
| 70 | int RSA_sign(int type, const unsigned char *m, unsigned int m_len, |
| 71 | unsigned char *sigret, unsigned int *siglen, RSA *rsa) |
| 72 | { |
| 73 | X509_SIG sig; |
| 74 | ASN1_TYPE parameter; |
| 75 | int i,j,ret=1; |
| 76 | unsigned char *p, *tmps = NULL; |
| 77 | const unsigned char *s = NULL; |
| 78 | X509_ALGOR algor; |
| 79 | ASN1_OCTET_STRING digest; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 80 | if((rsa->flags & RSA_FLAG_SIGN_VER) && rsa->meth->rsa_sign) |
| 81 | { |
| 82 | return rsa->meth->rsa_sign(type, m, m_len, |
| 83 | sigret, siglen, rsa); |
| 84 | } |
| 85 | /* Special case: SSL signature, just check the length */ |
| 86 | if(type == NID_md5_sha1) { |
| 87 | if(m_len != SSL_SIG_LENGTH) { |
| 88 | RSAerr(RSA_F_RSA_SIGN,RSA_R_INVALID_MESSAGE_LENGTH); |
| 89 | return(0); |
| 90 | } |
| 91 | i = SSL_SIG_LENGTH; |
| 92 | s = m; |
| 93 | } else { |
| 94 | sig.algor= &algor; |
| 95 | sig.algor->algorithm=OBJ_nid2obj(type); |
| 96 | if (sig.algor->algorithm == NULL) |
| 97 | { |
| 98 | RSAerr(RSA_F_RSA_SIGN,RSA_R_UNKNOWN_ALGORITHM_TYPE); |
| 99 | return(0); |
| 100 | } |
| 101 | if (sig.algor->algorithm->length == 0) |
| 102 | { |
| 103 | RSAerr(RSA_F_RSA_SIGN,RSA_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD); |
| 104 | return(0); |
| 105 | } |
| 106 | parameter.type=V_ASN1_NULL; |
| 107 | parameter.value.ptr=NULL; |
| 108 | sig.algor->parameter= ¶meter; |
| 109 | |
| 110 | sig.digest= &digest; |
| 111 | sig.digest->data=(unsigned char *)m; /* TMP UGLY CAST */ |
| 112 | sig.digest->length=m_len; |
| 113 | |
| 114 | i=i2d_X509_SIG(&sig,NULL); |
| 115 | } |
| 116 | j=RSA_size(rsa); |
| 117 | if (i > (j-RSA_PKCS1_PADDING_SIZE)) |
| 118 | { |
| 119 | RSAerr(RSA_F_RSA_SIGN,RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY); |
| 120 | return(0); |
| 121 | } |
| 122 | if(type != NID_md5_sha1) { |
| 123 | tmps=(unsigned char *)OPENSSL_malloc((unsigned int)j+1); |
| 124 | if (tmps == NULL) |
| 125 | { |
| 126 | RSAerr(RSA_F_RSA_SIGN,ERR_R_MALLOC_FAILURE); |
| 127 | return(0); |
| 128 | } |
| 129 | p=tmps; |
| 130 | i2d_X509_SIG(&sig,&p); |
| 131 | s=tmps; |
| 132 | } |
| 133 | i=RSA_private_encrypt(i,s,sigret,rsa,RSA_PKCS1_PADDING); |
| 134 | if (i <= 0) |
| 135 | ret=0; |
| 136 | else |
| 137 | *siglen=i; |
| 138 | |
| 139 | if(type != NID_md5_sha1) { |
| 140 | OPENSSL_cleanse(tmps,(unsigned int)j+1); |
| 141 | OPENSSL_free(tmps); |
| 142 | } |
| 143 | return(ret); |
| 144 | } |
| 145 | |
| 146 | int int_rsa_verify(int dtype, const unsigned char *m, |
| 147 | unsigned int m_len, |
| 148 | unsigned char *rm, size_t *prm_len, |
| 149 | const unsigned char *sigbuf, size_t siglen, |
| 150 | RSA *rsa) |
| 151 | { |
| 152 | int i,ret=0,sigtype; |
| 153 | unsigned char *s; |
| 154 | X509_SIG *sig=NULL; |
| 155 | |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 156 | if (siglen != (unsigned int)RSA_size(rsa)) |
| 157 | { |
| 158 | RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_WRONG_SIGNATURE_LENGTH); |
| 159 | return(0); |
| 160 | } |
| 161 | |
| 162 | if((dtype == NID_md5_sha1) && rm) |
| 163 | { |
| 164 | i = RSA_public_decrypt((int)siglen, |
| 165 | sigbuf,rm,rsa,RSA_PKCS1_PADDING); |
| 166 | if (i <= 0) |
| 167 | return 0; |
| 168 | *prm_len = i; |
| 169 | return 1; |
| 170 | } |
| 171 | |
| 172 | s=(unsigned char *)OPENSSL_malloc((unsigned int)siglen); |
| 173 | if (s == NULL) |
| 174 | { |
| 175 | RSAerr(RSA_F_INT_RSA_VERIFY,ERR_R_MALLOC_FAILURE); |
| 176 | goto err; |
| 177 | } |
| 178 | if((dtype == NID_md5_sha1) && (m_len != SSL_SIG_LENGTH) ) { |
| 179 | RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_INVALID_MESSAGE_LENGTH); |
| 180 | goto err; |
| 181 | } |
| 182 | i=RSA_public_decrypt((int)siglen,sigbuf,s,rsa,RSA_PKCS1_PADDING); |
| 183 | |
| 184 | if (i <= 0) goto err; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 185 | |
| 186 | /* Special case: SSL signature */ |
| 187 | if(dtype == NID_md5_sha1) { |
| 188 | if((i != SSL_SIG_LENGTH) || memcmp(s, m, SSL_SIG_LENGTH)) |
| 189 | RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_BAD_SIGNATURE); |
| 190 | else ret = 1; |
| 191 | } else { |
| 192 | const unsigned char *p=s; |
| 193 | sig=d2i_X509_SIG(NULL,&p,(long)i); |
| 194 | |
| 195 | if (sig == NULL) goto err; |
| 196 | |
| 197 | /* Excess data can be used to create forgeries */ |
| 198 | if(p != s+i) |
| 199 | { |
| 200 | RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_BAD_SIGNATURE); |
| 201 | goto err; |
| 202 | } |
| 203 | |
| 204 | /* Parameters to the signature algorithm can also be used to |
| 205 | create forgeries */ |
| 206 | if(sig->algor->parameter |
| 207 | && ASN1_TYPE_get(sig->algor->parameter) != V_ASN1_NULL) |
| 208 | { |
| 209 | RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_BAD_SIGNATURE); |
| 210 | goto err; |
| 211 | } |
| 212 | |
| 213 | sigtype=OBJ_obj2nid(sig->algor->algorithm); |
| 214 | |
| 215 | |
| 216 | #ifdef RSA_DEBUG |
| 217 | /* put a backward compatibility flag in EAY */ |
| 218 | fprintf(stderr,"in(%s) expect(%s)\n",OBJ_nid2ln(sigtype), |
| 219 | OBJ_nid2ln(dtype)); |
| 220 | #endif |
| 221 | if (sigtype != dtype) |
| 222 | { |
| 223 | if (((dtype == NID_md5) && |
| 224 | (sigtype == NID_md5WithRSAEncryption)) || |
| 225 | ((dtype == NID_md2) && |
| 226 | (sigtype == NID_md2WithRSAEncryption))) |
| 227 | { |
| 228 | /* ok, we will let it through */ |
| 229 | #if !defined(OPENSSL_NO_STDIO) && !defined(OPENSSL_SYS_WIN16) |
| 230 | fprintf(stderr,"signature has problems, re-make with post SSLeay045\n"); |
| 231 | #endif |
| 232 | } |
| 233 | else |
| 234 | { |
| 235 | RSAerr(RSA_F_INT_RSA_VERIFY, |
| 236 | RSA_R_ALGORITHM_MISMATCH); |
| 237 | goto err; |
| 238 | } |
| 239 | } |
| 240 | if (rm) |
| 241 | { |
| 242 | const EVP_MD *md; |
| 243 | md = EVP_get_digestbynid(dtype); |
| 244 | if (md && (EVP_MD_size(md) != sig->digest->length)) |
| 245 | RSAerr(RSA_F_INT_RSA_VERIFY, |
| 246 | RSA_R_INVALID_DIGEST_LENGTH); |
| 247 | else |
| 248 | { |
| 249 | memcpy(rm, sig->digest->data, |
| 250 | sig->digest->length); |
| 251 | *prm_len = sig->digest->length; |
| 252 | ret = 1; |
| 253 | } |
| 254 | } |
| 255 | else if (((unsigned int)sig->digest->length != m_len) || |
| 256 | (memcmp(m,sig->digest->data,m_len) != 0)) |
| 257 | { |
| 258 | RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_BAD_SIGNATURE); |
| 259 | } |
| 260 | else |
| 261 | ret=1; |
| 262 | } |
| 263 | err: |
| 264 | if (sig != NULL) X509_SIG_free(sig); |
| 265 | if (s != NULL) |
| 266 | { |
| 267 | OPENSSL_cleanse(s,(unsigned int)siglen); |
| 268 | OPENSSL_free(s); |
| 269 | } |
| 270 | return(ret); |
| 271 | } |
| 272 | |
| 273 | int RSA_verify(int dtype, const unsigned char *m, unsigned int m_len, |
| 274 | const unsigned char *sigbuf, unsigned int siglen, |
| 275 | RSA *rsa) |
| 276 | { |
| 277 | |
| 278 | if((rsa->flags & RSA_FLAG_SIGN_VER) && rsa->meth->rsa_verify) |
| 279 | { |
| 280 | return rsa->meth->rsa_verify(dtype, m, m_len, |
| 281 | sigbuf, siglen, rsa); |
| 282 | } |
| 283 | |
| 284 | return int_rsa_verify(dtype, m, m_len, NULL, NULL, sigbuf, siglen, rsa); |
| 285 | } |