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* The DSA publickey algorithm.
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/* nettle, low-level cryptographics library
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* Copyright (C) 2002 Niels M�ller
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* The nettle library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or (at your
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* option) any later version.
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* The nettle library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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* License for more details.
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* You should have received a copy of the GNU Lesser General Public License
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* along with the nettle library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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#ifndef NETTLE_DSA_H_INCLUDED
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#define NETTLE_DSA_H_INCLUDED
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#include "nettle-types.h"
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/* For nettle_random_func */
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#include "nettle-meta.h"
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#define dsa_public_key_init nettle_dsa_public_key_init
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#define dsa_public_key_clear nettle_dsa_public_key_clear
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#define dsa_private_key_init nettle_dsa_private_key_init
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#define dsa_private_key_clear nettle_dsa_private_key_clear
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#define dsa_signature_init nettle_dsa_signature_init
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#define dsa_signature_clear nettle_dsa_signature_clear
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#define dsa_sign nettle_dsa_sign
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#define dsa_verify nettle_dsa_verify
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#define dsa_sign_digest nettle_dsa_sign_digest
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#define dsa_verify_digest nettle_dsa_verify_digest
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#define dsa_generate_keypair nettle_dsa_generate_keypair
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#define dsa_signature_from_sexp nettle_dsa_signature_from_sexp
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#define dsa_keypair_from_sexp_alist nettle_dsa_keypair_from_sexp_alist
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#define dsa_keypair_from_sexp nettle_dsa_keypair_from_sexp
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#define DSA_MIN_P_BITS 512
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#define DSA_Q_OCTETS 20
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#define DSA_Q_BITS 160
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struct dsa_private_key
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/* Unlike an rsa public key, private key operations will need both
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* the private and the public information. */
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/* Signing a message works as follows:
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* Store the private key in a dsa_private_key struct.
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* Initialize a hashing context, by callling
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* Hash the message by calling
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* Create the signature by calling
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* The signature is represented as a struct dsa_signature. This call also
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* resets the hashing context.
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* When done with the key and signature, don't forget to call
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* dsa_signature_clear.
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/* Calls mpz_init to initialize bignum storage. */
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dsa_public_key_init(struct dsa_public_key *key);
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/* Calls mpz_clear to deallocate bignum storage. */
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dsa_public_key_clear(struct dsa_public_key *key);
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/* Calls mpz_init to initialize bignum storage. */
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dsa_private_key_init(struct dsa_private_key *key);
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/* Calls mpz_clear to deallocate bignum storage. */
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dsa_private_key_clear(struct dsa_private_key *key);
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/* Calls mpz_init to initialize bignum storage. */
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dsa_signature_init(struct dsa_signature *signature);
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/* Calls mpz_clear to deallocate bignum storage. */
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dsa_signature_clear(struct dsa_signature *signature);
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dsa_sign(const struct dsa_public_key *pub,
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const struct dsa_private_key *key,
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void *random_ctx, nettle_random_func random,
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struct sha1_ctx *hash,
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struct dsa_signature *signature);
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dsa_verify(const struct dsa_public_key *key,
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struct sha1_ctx *hash,
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const struct dsa_signature *signature);
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dsa_sign_digest(const struct dsa_public_key *pub,
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const struct dsa_private_key *key,
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void *random_ctx, nettle_random_func random,
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const uint8_t *digest,
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struct dsa_signature *signature);
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dsa_verify_digest(const struct dsa_public_key *key,
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const uint8_t *digest,
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const struct dsa_signature *signature);
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dsa_generate_keypair(struct dsa_public_key *pub,
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struct dsa_private_key *key,
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void *random_ctx, nettle_random_func random,
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void *progress_ctx, nettle_progress_func progress,
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/* Size of key, in bits.
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* Use size = 512 + 64 * l for the official
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struct sexp_iterator;
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dsa_signature_from_sexp(struct dsa_signature *rs,
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struct sexp_iterator *i);
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dsa_keypair_from_sexp_alist(struct dsa_public_key *pub,
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struct dsa_private_key *priv,
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struct sexp_iterator *i);
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/* If PRIV is NULL, expect a public-key expression. If PUB is NULL,
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* expect a private key expression and ignore the parts not needed for
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/* Keys must be initialized before calling this function, as usual. */
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dsa_keypair_from_sexp(struct dsa_public_key *pub,
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struct dsa_private_key *priv,
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unsigned length, const uint8_t *expr);
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#endif /* NETTLE_DSA_H_INCLUDED */
added
removed
dsa.h
