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41 results

dsa.h

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  • Forked from Nettle / nettle
    3081 commits behind the upstream repository.
    • Niels Möller's avatar
      121313f4
      * nettle-types.h: New (generated) file, to be used instead of including · 121313f4
      Niels Möller authored
      <inttypes.h> directly. Updated all users of inttypes.h.
      
      Rev: src/nettle/aes.h:1.7
      Rev: src/nettle/aesdata.c:1.3
      Rev: src/nettle/arcfour.h:1.5
      Rev: src/nettle/base16.h:1.3
      Rev: src/nettle/base64.h:1.14
      Rev: src/nettle/bignum.h:1.8
      Rev: src/nettle/blowfish.h:1.9
      Rev: src/nettle/cast128.h:1.5
      Rev: src/nettle/cbc.h:1.5
      Rev: src/nettle/des.h:1.9
      Rev: src/nettle/dsa.h:1.9
      Rev: src/nettle/knuth-lfib.h:1.3
      Rev: src/nettle/md2.h:1.3
      Rev: src/nettle/md4.h:1.3
      Rev: src/nettle/md5.h:1.7
      Rev: src/nettle/memxor.h:1.3
      Rev: src/nettle/nettle-meta.h:1.11
      Rev: src/nettle/pkcs1.h:1.3
      Rev: src/nettle/realloc.h:1.2
      Rev: src/nettle/rsa.h:1.24
      Rev: src/nettle/serpent.h:1.7
      Rev: src/nettle/sexp.h:1.16
      Rev: src/nettle/sha.h:1.4
      Rev: src/nettle/twofish.h:1.6
      121313f4
      History
      * nettle-types.h: New (generated) file, to be used instead of including
      Niels Möller authored
      <inttypes.h> directly. Updated all users of inttypes.h.
      
      Rev: src/nettle/aes.h:1.7
      Rev: src/nettle/aesdata.c:1.3
      Rev: src/nettle/arcfour.h:1.5
      Rev: src/nettle/base16.h:1.3
      Rev: src/nettle/base64.h:1.14
      Rev: src/nettle/bignum.h:1.8
      Rev: src/nettle/blowfish.h:1.9
      Rev: src/nettle/cast128.h:1.5
      Rev: src/nettle/cbc.h:1.5
      Rev: src/nettle/des.h:1.9
      Rev: src/nettle/dsa.h:1.9
      Rev: src/nettle/knuth-lfib.h:1.3
      Rev: src/nettle/md2.h:1.3
      Rev: src/nettle/md4.h:1.3
      Rev: src/nettle/md5.h:1.7
      Rev: src/nettle/memxor.h:1.3
      Rev: src/nettle/nettle-meta.h:1.11
      Rev: src/nettle/pkcs1.h:1.3
      Rev: src/nettle/realloc.h:1.2
      Rev: src/nettle/rsa.h:1.24
      Rev: src/nettle/serpent.h:1.7
      Rev: src/nettle/sexp.h:1.16
      Rev: src/nettle/sha.h:1.4
      Rev: src/nettle/twofish.h:1.6
    dsa.h 5.01 KiB
    /* dsa.h
     *
     * The DSA publickey algorithm.
     */
    
    /* nettle, low-level cryptographics library
     *
     * Copyright (C) 2002 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.
     */
     
    #ifndef NETTLE_DSA_H_INCLUDED
    #define NETTLE_DSA_H_INCLUDED
    
    #include <gmp.h>
    
    #include "nettle-types.h"
    
    #include "sha.h"
    
    /* For nettle_random_func */
    #include "nettle-meta.h"
    
    /* Name mangling */
    #define dsa_public_key_init nettle_dsa_public_key_init
    #define dsa_public_key_clear nettle_dsa_public_key_clear
    #define dsa_private_key_init nettle_dsa_private_key_init
    #define dsa_private_key_clear nettle_dsa_private_key_clear
    #define dsa_signature_init nettle_dsa_signature_init
    #define dsa_signature_clear nettle_dsa_signature_clear
    #define dsa_sign nettle_dsa_sign
    #define dsa_verify nettle_dsa_verify
    #define dsa_sign_digest nettle_dsa_sign_digest
    #define dsa_verify_digest nettle_dsa_verify_digest
    #define dsa_generate_keypair nettle_dsa_generate_keypair
    #define dsa_signature_from_sexp nettle_dsa_signature_from_sexp
    #define dsa_keypair_from_sexp_alist nettle_dsa_keypair_from_sexp_alist
    #define dsa_keypair_from_sexp nettle_dsa_keypair_from_sexp
    
    #define DSA_MIN_P_BITS 512
    #define DSA_Q_OCTETS 20
    #define DSA_Q_BITS 160
    
    struct dsa_public_key
    {  
      /* Modulo */
      mpz_t p;
    
      /* Group order */
      mpz_t q;
    
      /* Generator */
      mpz_t g;
      
      /* Public value */
      mpz_t y;
    };
    
    struct dsa_private_key
    {
      /* Unlike an rsa public key, private key operations will need both
       * the private and the public information. */
      mpz_t x;
    };
    
    struct dsa_signature
    {
      mpz_t r;
      mpz_t s;
    };
    
    /* Signing a message works as follows:
     *
     * Store the private key in a dsa_private_key struct.
     *
     * Initialize a hashing context, by callling
     *   sha1_init
     *
     * Hash the message by calling
     *   sha1_update
     *
     * Create the signature by calling
     *   dsa_sign
     *
     * The signature is represented as a struct dsa_signature. This call also
     * resets the hashing context.
     *
     * When done with the key and signature, don't forget to call
     * dsa_signature_clear.
     */
    
    /* Calls mpz_init to initialize bignum storage. */
    void
    dsa_public_key_init(struct dsa_public_key *key);
    
    /* Calls mpz_clear to deallocate bignum storage. */
    void
    dsa_public_key_clear(struct dsa_public_key *key);
    
    
    /* Calls mpz_init to initialize bignum storage. */
    void
    dsa_private_key_init(struct dsa_private_key *key);
    
    /* Calls mpz_clear to deallocate bignum storage. */
    void
    dsa_private_key_clear(struct dsa_private_key *key);
    
    /* Calls mpz_init to initialize bignum storage. */
    void
    dsa_signature_init(struct dsa_signature *signature);
    
    /* Calls mpz_clear to deallocate bignum storage. */
    void
    dsa_signature_clear(struct dsa_signature *signature);
    
    
    void
    dsa_sign(const struct dsa_public_key *pub,
    	 const struct dsa_private_key *key,
    	 void *random_ctx, nettle_random_func random,
    	 struct sha1_ctx *hash,
    	 struct dsa_signature *signature);
    
    
    int
    dsa_verify(const struct dsa_public_key *key,
    	   struct sha1_ctx *hash,
    	   const struct dsa_signature *signature);
    
    void
    dsa_sign_digest(const struct dsa_public_key *pub,
    		const struct dsa_private_key *key,
    		void *random_ctx, nettle_random_func random,
    		const uint8_t *digest,
    		struct dsa_signature *signature);
    
    int
    dsa_verify_digest(const struct dsa_public_key *key,
    		  const uint8_t *digest,
    		  const struct dsa_signature *signature);
    
    /* Key generation */
    
    int
    dsa_generate_keypair(struct dsa_public_key *pub,
    		     struct dsa_private_key *key,
    
    		     void *random_ctx, nettle_random_func random,
    		     void *progress_ctx, nettle_progress_func progress,
    
    		     /* Size of key, in bits.
    		      * Use size = 512 + 64 * l for the official
    		      * NIS key sizes. */
    		     unsigned bits);
    
    struct sexp_iterator;
    
    int
    dsa_signature_from_sexp(struct dsa_signature *rs,
    			struct sexp_iterator *i);
    
    int
    dsa_keypair_from_sexp_alist(struct dsa_public_key *pub,
    			    struct dsa_private_key *priv,
    			    unsigned limit,
    			    struct sexp_iterator *i);
    
    /* If PRIV is NULL, expect a public-key expression. If PUB is NULL,
     * expect a private key expression and ignore the parts not needed for
     * the public key. */
    /* Keys must be initialized before calling this function, as usual. */
    int
    dsa_keypair_from_sexp(struct dsa_public_key *pub,
    		      struct dsa_private_key *priv,
    		      unsigned limit,
    		      unsigned length, const uint8_t *expr);
    
    
    #endif /* NETTLE_DSA_H_INCLUDED */