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39 results

der2rsa.c

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  • Forked from Nettle / nettle
    Source project has a limited visibility.
    der2rsa.c 3.64 KiB
    /* der2rsa.c
     *
     * Decoding of keys in PKCS#1 format.
     */
    
    /* nettle, low-level cryptographics library
     *
     * Copyright (C) 2005 Niels Möller
     *  
     * 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 "rsa.h"
    
    #include "bignum.h"
    #include "asn1.h"
    
    #define GET(i, x, l)					\
    (asn1_der_iterator_next((i)) == ASN1_ITERATOR_PRIMITIVE	\
     && (i)->type == ASN1_INTEGER				\
     && asn1_der_get_bignum((i), (x), (l))			\
     && mpz_sgn((x)) > 0)
    
    int
    rsa_public_key_from_der_iterator(struct rsa_public_key *pub,
    				 unsigned limit,
    				 struct asn1_der_iterator *i)
    {
      /* RSAPublicKey ::= SEQUENCE {
             modulus           INTEGER,  -- n
    	 publicExponent    INTEGER   -- e
          }
      */
    
      return (i->type == ASN1_SEQUENCE
    	  && asn1_der_decode_constructed_last(i) == ASN1_ITERATOR_PRIMITIVE
    	  && asn1_der_get_bignum(i, pub->n, limit) 
    	  && mpz_sgn(pub->n) > 0
    	  && GET(i, pub->e, limit)
    	  && asn1_der_iterator_next(i) == ASN1_ITERATOR_END
    	  && rsa_public_key_prepare(pub));
    }
    
    int
    rsa_private_key_from_der_iterator(struct rsa_public_key *pub,
    				  struct rsa_private_key *priv,
    				  unsigned limit,
    				  struct asn1_der_iterator *i)
    {
      /* RSAPrivateKey ::= SEQUENCE {
             version           Version,
    	 modulus           INTEGER,  -- n
    	 publicExponent    INTEGER,  -- e