crypto/rsa/rsa_saos.c

   1 /* crypto/rsa/rsa_saos.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 int RSA_sign_ASN1_OCTET_STRING(int type,
  67                                const unsigned char *m, unsigned int m_len,
  68                                unsigned char *sigret, unsigned int *siglen,
  69                                RSA *rsa)
  70 {
  71     ASN1_OCTET_STRING sig;
  72     int i, j, ret = 1;
  73     unsigned char *p, *s;
  74
  75     sig.type = V_ASN1_OCTET_STRING;
  76     sig.length = m_len;
  77     sig.data = (unsigned char *)m;
  78
  79     i = i2d_ASN1_OCTET_STRING(&sig, NULL);
  80     j = RSA_size(rsa);
  81     if (i > (j - RSA_PKCS1_PADDING_SIZE)) {
  82         RSAerr(RSA_F_RSA_SIGN_ASN1_OCTET_STRING,
  83                RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);
  84         return (0);
  85     }
  86     s = OPENSSL_malloc((unsigned int)j + 1);
  87     if (s == NULL) {
  88         RSAerr(RSA_F_RSA_SIGN_ASN1_OCTET_STRING, ERR_R_MALLOC_FAILURE);
  89         return (0);
  90     }
  91     p = s;
  92     i2d_ASN1_OCTET_STRING(&sig, &p);
  93     i = RSA_private_encrypt(i, s, sigret, rsa, RSA_PKCS1_PADDING);
  94     if (i <= 0)
  95         ret = 0;
  96     else
  97         *siglen = i;
  98
  99     OPENSSL_clear_free(s, (unsigned int)j + 1);
 100     return (ret);
 101 }
 102
 103 int RSA_verify_ASN1_OCTET_STRING(int dtype,
 104                                  const unsigned char *m,
 105                                  unsigned int m_len, unsigned char *sigbuf,
 106                                  unsigned int siglen, RSA *rsa)
 107 {
 108     int i, ret = 0;
 109     unsigned char *s;
 110     const unsigned char *p;
 111     ASN1_OCTET_STRING *sig = NULL;
 112
 113     if (siglen != (unsigned int)RSA_size(rsa)) {
 114         RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING,
 115                RSA_R_WRONG_SIGNATURE_LENGTH);
 116         return (0);
 117     }
 118
 119     s = OPENSSL_malloc((unsigned int)siglen);
 120     if (s == NULL) {
 121         RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING, ERR_R_MALLOC_FAILURE);
 122         goto err;
 123     }
 124     i = RSA_public_decrypt((int)siglen, sigbuf, s, rsa, RSA_PKCS1_PADDING);
 125
 126     if (i <= 0)
 127         goto err;
 128
 129     p = s;
 130     sig = d2i_ASN1_OCTET_STRING(NULL, &p, (long)i);
 131     if (sig == NULL)
 132         goto err;
 133
 134     if (((unsigned int)sig->length != m_len) ||
 135         (memcmp(m, sig->data, m_len) != 0)) {
 136         RSAerr(RSA_F_RSA_VERIFY_ASN1_OCTET_STRING, RSA_R_BAD_SIGNATURE);
 137     } else
 138         ret = 1;
 139  err:
 140     ASN1_OCTET_STRING_free(sig);
 141     OPENSSL_clear_free(s, (unsigned int)siglen);
 142     return (ret);
 143 }