crypto/rsa/rsa_saos.c

   1 /* crypto/rsa/rsa_saos.c */
   2 /* Copyright (C) 1995-1997 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 "bn.h"
  62 #include "rsa.h"
  63 #include "objects.h"
  64 #include "x509.h"
  65
  66 int RSA_sign_ASN1_OCTET_STRING(type,m,m_len,sigret,siglen,rsa)
  67 int type;
  68 unsigned char *m;
  69 unsigned int m_len;
  70 unsigned char *sigret;
  71 unsigned int *siglen;
  72 RSA *rsa;
  73         {
  74         ASN1_OCTET_STRING sig;
  75         int i,j,ret=1;
  76         unsigned char *p,*s;
  77
  78         sig.type=V_ASN1_OCTET_STRING;
  79         sig.length=m_len;
  80         sig.data=m;
  81
  82         i=i2d_ASN1_OCTET_STRING(&sig,NULL);
  83         j=RSA_size(rsa);
  84         if ((i-RSA_PKCS1_PADDING) > j)
  85                 {
  86                 RSAerr(RSA_F_RSA_SIGN_ASN1_OCTET_STRING,RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);
  87                 return(0);
  88                 }
  89         s=(unsigned char *)Malloc((unsigned int)j+1);
  90         if (s == NULL)
  91                 {
  92                 RSAerr(RSA_F_RSA_SIGN_ASN1_OCTET_STRING,ERR_R_MALLOC_FAILURE);
  93                 return(0);
  94                 }
  95         p=s;
  96         i2d_ASN1_OCTET_STRING(&sig,&p);
  97         i=RSA_private_encrypt(i,s,sigret,rsa,RSA_PKCS1_PADDING);
  98         if (i <= 0)
  99                 ret=0;
 100         else
 101                 *siglen=i;
 102
 103         memset(s,0,(unsigned int)j+1);
 104         Free(s);
 105         return(ret);
 106         }
 107
 108 int RSA_verify_ASN1_OCTET_STRING(dtype, m, m_len, sigbuf, siglen, rsa)
 109 int dtype;
 110 unsigned char *m;
 111 unsigned int m_len;
 112 unsigned char *sigbuf;
 113 unsigned int siglen;
 114 RSA *rsa;
 115         {
 116         int i,ret=0;
 117         unsigned char *p,*s;
 118         ASN1_OCTET_STRING *sig=NULL;
 119
 120         if (siglen != (unsigned int)RSA_size(rsa))
 121                 {
 122                 RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING,RSA_R_WRONG_SIGNATURE_LENGTH);
 123                 return(0);
 124                 }
 125
 126         s=(unsigned char *)Malloc((unsigned int)siglen);
 127         if (s == NULL)
 128                 {
 129                 RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING,ERR_R_MALLOC_FAILURE);
 130                 goto err;
 131                 }
 132         i=RSA_public_decrypt((int)siglen,sigbuf,s,rsa,RSA_PKCS1_PADDING);
 133
 134         if (i <= 0) goto err;
 135
 136         p=s;
 137         sig=d2i_ASN1_OCTET_STRING(NULL,&p,(long)i);
 138         if (sig == NULL) goto err;
 139
 140         if (    ((unsigned int)sig->length != m_len) ||
 141                 (memcmp(m,sig->data,m_len) != 0))
 142                 {
 143                 RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING,RSA_R_BAD_SIGNATURE);
 144                 }
 145         else
 146                 ret=1;
 147 err:
 148         if (sig != NULL) ASN1_OCTET_STRING_free(sig);
 149         memset(s,0,(unsigned int)siglen);
 150         Free(s);
 151         return(ret);
 152         }
 153