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41 results

pkcs1-rsa-sha512.c

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    Nikos Mavrogiannopoulos authored and Niels Möller committed
    This adds all exported symbols in the map files explicitly under
    the following rules:
     - Symbols mentioned in internal headers go in a section which is
       valid only for testing, and linking with these symbols will break
       in library updates.
     - Symbols mentioned in installed headers go in the exported sections
       and are considered part of the ABI.
     - All internal symbols move to internal headers.
     - The _nettle_md5_compress and _nettle_sha1_compress become exported
       without the _nettle prefix, due to existing usage.
    da81c86a
    History
    pkcs1-rsa-sha512.c 2.91 KiB
    /* pkcs1-rsa-sha512.c
    
       PKCS stuff for rsa-sha512.
    
       Copyright (C) 2001, 2003, 2006, 2010 Niels Möller
    
       This file is part of GNU Nettle.
    
       GNU Nettle is free software: you can redistribute it and/or
       modify it under the terms of either:
    
         * the GNU Lesser General Public License as published by the Free
           Software Foundation; either version 3 of the License, or (at your
           option) any later version.
    
       or
    
         * the GNU General Public License as published by the Free
           Software Foundation; either version 2 of the License, or (at your
           option) any later version.
    
       or both in parallel, as here.
    
       GNU Nettle 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
       General Public License for more details.
    
       You should have received copies of the GNU General Public License and
       the GNU Lesser General Public License along with this program.  If
       not, see http://www.gnu.org/licenses/.
    */
    
    #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 "hogweed-internal.h"
    
    #include "gmp-glue.h"
    
    /* From RFC 3447, Public-Key Cryptography Standards (PKCS) #1: RSA
     * Cryptography Specifications Version 2.1.
     *
     *     id-sha512    OBJECT IDENTIFIER ::=
     *       {joint-iso-itu-t(2) country(16) us(840) organization(1)
     *         gov(101) csor(3) nistalgorithm(4) hashalgs(2) 3}
     */
    
    static const uint8_t
    sha512_prefix[] =
    {
      /* 19 octets prefix, 64 octets hash, total 83 */
      0x30,      81, /* SEQUENCE */
        0x30,    13, /* SEQUENCE */
          0x06,   9, /* OBJECT IDENTIFIER */
            0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03,
          0x05,   0, /* NULL */
        0x04,    64  /* OCTET STRING */
          /* Here comes the raw hash value, 64 octets */
    };
    
    int
    pkcs1_rsa_sha512_encode(mpz_t m, size_t key_size, struct sha512_ctx *hash)
    {
      uint8_t *p;
      TMP_GMP_DECL(em, uint8_t);
    
      TMP_GMP_ALLOC(em, key_size);
    
      p = _pkcs1_signature_prefix(key_size, em,
    			      sizeof(sha512_prefix),
    			      sha512_prefix,
    			      SHA512_DIGEST_SIZE);
      if (p)
        {
          sha512_digest(hash, SHA512_DIGEST_SIZE, p);
          nettle_mpz_set_str_256_u(m, key_size, em);
          TMP_GMP_FREE(em);
          return 1;
        }
      else
        {
          TMP_GMP_FREE(em);
          return 0;
        }
    }
    
    int
    pkcs1_rsa_sha512_encode_digest(mpz_t m, size_t key_size, const uint8_t *digest)
    {
      uint8_t *p;
      TMP_GMP_DECL(em, uint8_t);
    
      TMP_GMP_ALLOC(em, key_size);
    
      p = _pkcs1_signature_prefix(key_size, em,
    			      sizeof(sha512_prefix),
    			      sha512_prefix,
    			      SHA512_DIGEST_SIZE);
      if (p)
        {
          memcpy(p, digest, SHA512_DIGEST_SIZE);
          nettle_mpz_set_str_256_u(m, key_size, em);
          TMP_GMP_FREE(em);
          return 1;
        }
      else
        {
          TMP_GMP_FREE(em);
          return 0;
        }
    }