LCOV - code coverage report
Current view: top level - rsa - rsa_sign.c (source / functions) Hit Total Coverage
Test: lcov_coverage_final.info Lines: 66 113 58.4 %
Date: 2014-08-02 Functions: 3 3 100.0 %
Branches: 37 82 45.1 %

           Branch data     Line data    Source code
       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                 :        812 : 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                 :        812 :         int i,j,ret=1;
      76                 :        812 :         unsigned char *p, *tmps = NULL;
      77                 :        812 :         const unsigned char *s = NULL;
      78                 :            :         X509_ALGOR algor;
      79                 :            :         ASN1_OCTET_STRING digest;
      80 [ -  + ][ #  # ]:        812 :         if((rsa->flags & RSA_FLAG_SIGN_VER) && rsa->meth->rsa_sign)
      81                 :            :                 {
      82                 :          0 :                 return rsa->meth->rsa_sign(type, m, m_len,
      83                 :            :                         sigret, siglen, rsa);
      84                 :            :                 }
      85                 :            :         /* Special case: SSL signature, just check the length */
      86         [ +  + ]:        812 :         if(type == NID_md5_sha1) {
      87         [ -  + ]:        539 :                 if(m_len != SSL_SIG_LENGTH) {
      88                 :          0 :                         RSAerr(RSA_F_RSA_SIGN,RSA_R_INVALID_MESSAGE_LENGTH);
      89                 :          0 :                         return(0);
      90                 :            :                 }
      91                 :            :                 i = SSL_SIG_LENGTH;
      92                 :            :                 s = m;
      93                 :            :         } else {
      94                 :        273 :                 sig.algor= &algor;
      95                 :        273 :                 sig.algor->algorithm=OBJ_nid2obj(type);
      96         [ -  + ]:        273 :                 if (sig.algor->algorithm == NULL)
      97                 :            :                         {
      98                 :          0 :                         RSAerr(RSA_F_RSA_SIGN,RSA_R_UNKNOWN_ALGORITHM_TYPE);
      99                 :          0 :                         return(0);
     100                 :            :                         }
     101         [ -  + ]:        273 :                 if (sig.algor->algorithm->length == 0)
     102                 :            :                         {
     103                 :          0 :                         RSAerr(RSA_F_RSA_SIGN,RSA_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);
     104                 :          0 :                         return(0);
     105                 :            :                         }
     106                 :        273 :                 parameter.type=V_ASN1_NULL;
     107                 :        273 :                 parameter.value.ptr=NULL;
     108                 :        273 :                 sig.algor->parameter= &parameter;
     109                 :            : 
     110                 :        273 :                 sig.digest= &digest;
     111                 :        273 :                 sig.digest->data=(unsigned char *)m; /* TMP UGLY CAST */
     112                 :        273 :                 sig.digest->length=m_len;
     113                 :            : 
     114                 :        273 :                 i=i2d_X509_SIG(&sig,NULL);
     115                 :            :         }
     116                 :        812 :         j=RSA_size(rsa);
     117         [ -  + ]:        812 :         if (i > (j-RSA_PKCS1_PADDING_SIZE))
     118                 :            :                 {
     119                 :          0 :                 RSAerr(RSA_F_RSA_SIGN,RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);
     120                 :          0 :                 return(0);
     121                 :            :                 }
     122         [ +  + ]:        812 :         if(type != NID_md5_sha1) {
     123                 :        273 :                 tmps=(unsigned char *)OPENSSL_malloc((unsigned int)j+1);
     124         [ -  + ]:        273 :                 if (tmps == NULL)
     125                 :            :                         {
     126                 :          0 :                         RSAerr(RSA_F_RSA_SIGN,ERR_R_MALLOC_FAILURE);
     127                 :          0 :                         return(0);
     128                 :            :                         }
     129                 :        273 :                 p=tmps;
     130                 :        273 :                 i2d_X509_SIG(&sig,&p);
     131                 :        273 :                 s=tmps;
     132                 :            :         }
     133                 :        812 :         i=RSA_private_encrypt(i,s,sigret,rsa,RSA_PKCS1_PADDING);
     134         [ +  - ]:        812 :         if (i <= 0)
     135                 :            :                 ret=0;
     136                 :            :         else
     137                 :        812 :                 *siglen=i;
     138                 :            : 
     139         [ +  + ]:        812 :         if(type != NID_md5_sha1) {
     140                 :        273 :                 OPENSSL_cleanse(tmps,(unsigned int)j+1);
     141                 :        273 :                 OPENSSL_free(tmps);
     142                 :            :         }
     143                 :        812 :         return(ret);
     144                 :            :         }
     145                 :            : 
     146                 :       1650 : 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                 :       1650 :         int i,ret=0,sigtype;
     153                 :            :         unsigned char *s;
     154                 :       1650 :         X509_SIG *sig=NULL;
     155                 :            : 
     156         [ -  + ]:       1650 :         if (siglen != (unsigned int)RSA_size(rsa))
     157                 :            :                 {
     158                 :          0 :                 RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_WRONG_SIGNATURE_LENGTH);
     159                 :          0 :                 return(0);
     160                 :            :                 }
     161                 :            : 
     162         [ -  + ]:       1650 :         if((dtype == NID_md5_sha1) && rm)
     163                 :            :                 {
     164                 :          0 :                 i = RSA_public_decrypt((int)siglen,
     165                 :            :                                         sigbuf,rm,rsa,RSA_PKCS1_PADDING);
     166         [ #  # ]:          0 :                 if (i <= 0)
     167                 :            :                         return 0;
     168                 :          0 :                 *prm_len = i;
     169                 :          0 :                 return 1;
     170                 :            :                 }
     171                 :            : 
     172                 :       1650 :         s=(unsigned char *)OPENSSL_malloc((unsigned int)siglen);
     173         [ -  + ]:       1650 :         if (s == NULL)
     174                 :            :                 {
     175                 :          0 :                 RSAerr(RSA_F_INT_RSA_VERIFY,ERR_R_MALLOC_FAILURE);
     176                 :          0 :                 goto err;
     177                 :            :                 }
     178         [ -  + ]:       1650 :         if((dtype == NID_md5_sha1) && (m_len != SSL_SIG_LENGTH) ) {
     179                 :          0 :                         RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_INVALID_MESSAGE_LENGTH);
     180                 :          0 :                         goto err;
     181                 :            :         }
     182                 :       1650 :         i=RSA_public_decrypt((int)siglen,sigbuf,s,rsa,RSA_PKCS1_PADDING);
     183                 :            : 
     184         [ +  + ]:       1650 :         if (i <= 0) goto err;
     185                 :            :         /* Oddball MDC2 case: signature can be OCTET STRING.
     186                 :            :          * check for correct tag and length octets.
     187                 :            :          */
     188 [ -  + ][ #  # ]:       1637 :         if (dtype == NID_mdc2 && i == 18 && s[0] == 0x04 && s[1] == 0x10)
                 [ #  # ]
     189                 :            :                 {
     190         [ #  # ]:          0 :                 if (rm)
     191                 :            :                         {
     192                 :          0 :                         memcpy(rm, s + 2, 16);
     193                 :          0 :                         *prm_len = 16;
     194                 :          0 :                         ret = 1;
     195                 :            :                         }
     196         [ #  # ]:          0 :                 else if(memcmp(m, s + 2, 16))
     197                 :          0 :                         RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
     198                 :            :                 else
     199                 :            :                         ret = 1;
     200                 :            :                 }
     201                 :            : 
     202                 :            :         /* Special case: SSL signature */
     203         [ +  + ]:       1637 :         if(dtype == NID_md5_sha1) {
     204 [ +  - ][ -  + ]:        539 :                 if((i != SSL_SIG_LENGTH) || memcmp(s, m, SSL_SIG_LENGTH))
     205                 :          0 :                                 RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
     206                 :            :                 else ret = 1;
     207                 :            :         } else {
     208                 :       1098 :                 const unsigned char *p=s;
     209                 :       1098 :                 sig=d2i_X509_SIG(NULL,&p,(long)i);
     210                 :            : 
     211         [ +  - ]:       1098 :                 if (sig == NULL) goto err;
     212                 :            : 
     213                 :            :                 /* Excess data can be used to create forgeries */
     214         [ -  + ]:       1098 :                 if(p != s+i)
     215                 :            :                         {
     216                 :          0 :                         RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
     217                 :          0 :                         goto err;
     218                 :            :                         }
     219                 :            : 
     220                 :            :                 /* Parameters to the signature algorithm can also be used to
     221                 :            :                    create forgeries */
     222         [ +  - ]:       1098 :                 if(sig->algor->parameter
     223         [ -  + ]:       1098 :                    && ASN1_TYPE_get(sig->algor->parameter) != V_ASN1_NULL)
     224                 :            :                         {
     225                 :          0 :                         RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
     226                 :          0 :                         goto err;
     227                 :            :                         }
     228                 :            : 
     229                 :       1098 :                 sigtype=OBJ_obj2nid(sig->algor->algorithm);
     230                 :            : 
     231                 :            : 
     232                 :            :         #ifdef RSA_DEBUG
     233                 :            :                 /* put a backward compatibility flag in EAY */
     234                 :            :                 fprintf(stderr,"in(%s) expect(%s)\n",OBJ_nid2ln(sigtype),
     235                 :            :                         OBJ_nid2ln(dtype));
     236                 :            :         #endif
     237         [ -  + ]:       1098 :                 if (sigtype != dtype)
     238                 :            :                         {
     239         [ #  # ]:          0 :                         if (((dtype == NID_md5) &&
     240         [ #  # ]:          0 :                                 (sigtype == NID_md5WithRSAEncryption)) ||
     241                 :          0 :                                 ((dtype == NID_md2) &&
     242                 :          0 :                                 (sigtype == NID_md2WithRSAEncryption)))
     243                 :            :                                 {
     244                 :            :                                 /* ok, we will let it through */
     245                 :            : #if !defined(OPENSSL_NO_STDIO) && !defined(OPENSSL_SYS_WIN16)
     246                 :          0 :                                 fprintf(stderr,"signature has problems, re-make with post SSLeay045\n");
     247                 :            : #endif
     248                 :            :                                 }
     249                 :            :                         else
     250                 :            :                                 {
     251                 :          0 :                                 RSAerr(RSA_F_INT_RSA_VERIFY,
     252                 :            :                                                 RSA_R_ALGORITHM_MISMATCH);
     253                 :          0 :                                 goto err;
     254                 :            :                                 }
     255                 :            :                         }
     256         [ -  + ]:       1098 :                 if (rm)
     257                 :            :                         {
     258                 :            :                         const EVP_MD *md;
     259                 :          0 :                         md = EVP_get_digestbynid(dtype);
     260 [ #  # ][ #  # ]:          0 :                         if (md && (EVP_MD_size(md) != sig->digest->length))
     261                 :          0 :                                 RSAerr(RSA_F_INT_RSA_VERIFY,
     262                 :            :                                                 RSA_R_INVALID_DIGEST_LENGTH);
     263                 :            :                         else
     264                 :            :                                 {
     265                 :          0 :                                 memcpy(rm, sig->digest->data,
     266                 :          0 :                                                         sig->digest->length);
     267                 :          0 :                                 *prm_len = sig->digest->length;
     268                 :          0 :                                 ret = 1;
     269                 :            :                                 }
     270                 :            :                         }
     271 [ +  - ][ +  + ]:       1098 :                 else if (((unsigned int)sig->digest->length != m_len) ||
     272                 :       1098 :                         (memcmp(m,sig->digest->data,m_len) != 0))
     273                 :            :                         {
     274                 :       1098 :                         RSAerr(RSA_F_INT_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
     275                 :            :                         }
     276                 :            :                 else
     277                 :            :                         ret=1;
     278                 :            :         }
     279                 :            : err:
     280         [ +  + ]:       1650 :         if (sig != NULL) X509_SIG_free(sig);
     281         [ +  - ]:       1650 :         if (s != NULL)
     282                 :            :                 {
     283                 :       1650 :                 OPENSSL_cleanse(s,(unsigned int)siglen);
     284                 :       1650 :                 OPENSSL_free(s);
     285                 :            :                 }
     286                 :       1650 :         return(ret);
     287                 :            :         }
     288                 :            : 
     289                 :       1650 : int RSA_verify(int dtype, const unsigned char *m, unsigned int m_len,
     290                 :            :                 const unsigned char *sigbuf, unsigned int siglen,
     291                 :            :                 RSA *rsa)
     292                 :            :         {
     293                 :            : 
     294 [ -  + ][ #  # ]:       1650 :         if((rsa->flags & RSA_FLAG_SIGN_VER) && rsa->meth->rsa_verify)
     295                 :            :                 {
     296                 :          0 :                 return rsa->meth->rsa_verify(dtype, m, m_len,
     297                 :            :                         sigbuf, siglen, rsa);
     298                 :            :                 }
     299                 :            : 
     300                 :       1650 :         return int_rsa_verify(dtype, m, m_len, NULL, NULL, sigbuf, siglen, rsa);
     301                 :            :         }

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