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41 results

pkcs1-rsa-sha256.c

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  • Forked from Nettle / nettle
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    pkcs1-rsa-sha256.c 2.65 KiB
    /* pkcs1-rsa-sha256.c
     *
     * PKCS stuff for rsa-sha256.
     */
    
    /* nettle, low-level cryptographics library
     *
     * Copyright (C) 2001, 2003, 2006 Niels Mller
     *  
     * The nettle library is free software; you can redistribute it and/or modify
     * it under the terms of the GNU Lesser General Public License as published by
     * the Free Software Foundation; either version 2.1 of the License, or (at your
     * option) any later version.
     * 
     * The nettle library is distributed in the hope that it will be useful, but
     * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
     * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
     * License for more details.
     * 
     * You should have received a copy of the GNU Lesser General Public License
     * along with the nettle library; see the file COPYING.LIB.  If not, write to
     * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
     * MA 02111-1307, USA.
     */
    
    #if HAVE_CONFIG_H
    # include "config.h"
    #endif
    
    #include <assert.h>
    #include <stdlib.h>
    #include <string.h>
    
    #include "rsa.h"
    
    #include "bignum.h"
    #include "pkcs1.h"
    
    #include "nettle-internal.h"
    
    /* From RFC 3447, Public-Key Cryptography Standards (PKCS) #1: RSA
     * Cryptography Specifications Version 2.1.
     *
     *     id-sha256    OBJECT IDENTIFIER ::=
     *       {joint-iso-itu-t(2) country(16) us(840) organization(1)
     *         gov(101) csor(3) nistalgorithm(4) hashalgs(2) 1}
     */
    
    static const uint8_t
    sha256_prefix[] =
    {
      /* 19 octets prefix, 32 octets hash, total 51 */
      0x30,      49, /* SEQUENCE */
        0x30,    13, /* SEQUENCE */
          0x06,   9, /* OBJECT IDENTIFIER */
            0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01,
          0x05,   0, /* NULL */
        0x04,    32  /* OCTET STRING */
          /* Here comes the raw hash value */
    };
    
    int
    pkcs1_rsa_sha256_encode(mpz_t m, unsigned size, struct sha256_ctx *hash)
    {
      TMP_DECL(em, uint8_t, NETTLE_MAX_BIGNUM_BITS / 8);
      TMP_ALLOC(em, size);
    
      if (pkcs1_signature_prefix(size, em,
    			     sizeof(sha256_prefix),
    			     sha256_prefix,
    			     SHA256_DIGEST_SIZE))
        {
          sha256_digest(hash, SHA256_DIGEST_SIZE, em + size - SHA256_DIGEST_SIZE);
          nettle_mpz_set_str_256_u(m, size, em);
          return 1;
        }
      else
        return 0;	
    }
    
    int
    pkcs1_rsa_sha256_encode_digest(mpz_t m, unsigned size, const uint8_t *digest)
    {
      TMP_DECL(em, uint8_t, NETTLE_MAX_BIGNUM_BITS / 8);
      TMP_ALLOC(em, size);
    
      if (pkcs1_signature_prefix(size, em,
    			     sizeof(sha256_prefix),
    			     sha256_prefix,
    			     SHA256_DIGEST_SIZE))
        {
          memcpy(em + size - SHA256_DIGEST_SIZE, digest, SHA256_DIGEST_SIZE);
          nettle_mpz_set_str_256_u(m, size, em);
          return 1;
        }
      else
        return 0;
    }