+++ /dev/null
-/* -*-c-*-
- *
- * $Id: dsa.h,v 1.9 2004/04/08 01:36:15 mdw Exp $
- *
- * Digital Signature Algorithm
- *
- * (c) 1999 Straylight/Edgeware
- */
-
-/*----- Licensing notice --------------------------------------------------*
- *
- * This file is part of Catacomb.
- *
- * Catacomb is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Library General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or (at your option) any later version.
- *
- * Catacomb 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 Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with Catacomb; if not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- * MA 02111-1307, USA.
- */
-
-#ifndef CATACOMB_DSA_H
-#define CATACOMB_DSA_H
-
-#ifdef __cplusplus
- extern "C" {
-#endif
-
-/*----- Notes on the Digital Signature Algorithm --------------------------*
- *
- * The Digital Signature Algorithm was designed by the NSA for US Government
- * use. It's defined in FIPS 186-1. Whether it's covered by patents is
- * under dispute, although it looks relatively clear. It produces compact
- * signatures, and is relatively easy to compute. It seems strong, if
- * appropriate parameters are chosen.
- */
-
-/*----- Header files ------------------------------------------------------*/
-
-#ifndef CATACOMB_DH_H
-# include "dh.h"
-#endif
-
-#ifndef CATACOMB_KEY_H
-# include "key.h"
-#endif
-
-#ifndef CATACOMB_KEYCHECK_H
-# include "keycheck.h"
-#endif
-
-#ifndef CATACOMB_MP_H
-# include "mp.h"
-#endif
-
-#ifndef CATACOMB_PGEN_H
-# include "pgen.h"
-#endif
-
-/*----- Data structures ---------------------------------------------------*/
-
-/* --- The parameters and keys are the same as for Diffie-Hellman --- */
-
-typedef dh_param dsa_param;
-typedef dh_pub dsa_pub;
-typedef dh_priv dsa_priv;
-
-/* --- DSA key seed structure --- */
-
-typedef struct dsa_seed {
- void *p; /* Pointer to seed material */
- size_t sz; /* Size of seed material */
- unsigned count; /* Iterations to find @p@ */
-} dsa_seed;
-
-/* --- DSA signature structure --- *
- *
- * This is the recommended structure for a DSA signature. The actual signing
- * function can cope with arbitrary-sized objects given appropriate
- * parameters, however.
- */
-
-#define DSA_SIGLEN 20
-
-typedef struct dsa_sig {
- octet r[DSA_SIGLEN]; /* 160-bit @r@ value */
- octet s[DSA_SIGLEN]; /* 160-bit @s@ value */
-} dsa_sig;
-
-/*----- Key fetching ------------------------------------------------------*/
-
-#define dsa_paramfetch dh_paramfetch
-#define dsa_pubfetch dh_pubfetch
-#define dsa_privfetch dh_privfetch
-
-#define DSA_PARAMFETCHSZ DH_PARAMFETCHSZ
-#define DSA_PUBFETCHSZ DH_PUBFETCHSZ
-#define DSA_PRIVFETCHSZ DH_PRIVFETCHSZ
-
-#define dsa_paramfree dh_paramfree
-#define dsa_pubfree dh_pubfree
-#define dsa_privfree dh_privfree
-
-/*----- DSA stepper -------------------------------------------------------*/
-
-typedef struct dsa_stepctx {
-
- /* --- To be initialized by the client --- */
-
- grand *r; /* Random number generator */
- mp *q; /* Force @p@ to be a multiple */
- size_t bits; /* Number of bits in the result */
- unsigned or; /* OR mask for low order bits */
- unsigned count; /* Counts the number of steps made */
- void *seedbuf; /* Pointer to seed buffer */
-} dsa_stepctx;
-
-/* --- @dsa_step@ --- *
- *
- * The stepper chooses random integers, ensures that they are a multiple of
- * @q@ (if specified), sets the low-order bits, and then tests for
- * divisibility by small primes.
- */
-
-extern pgen_proc dsa_step;
-
-/*----- Functions provided ------------------------------------------------*/
-
-/* --- @dsa_gen@ --- *
- *
- * Arguments: @dsa_param *dp@ = where to store parameters
- * @unsigned ql@ = length of @q@ in bits
- * @unsigned pl@ = length of @p@ in bits
- * @unsigned steps@ = number of steps to find @q@
- * @const void *k@ = pointer to key material
- * @size_t sz@ = size of key material
- * @dsa_seed *sd@ = optional pointer for output seed information
- * @pgen_proc *event@ = event handler function
- * @void *ectx@ = argument for event handler
- *
- * Returns: @PGEN_DONE@ if everything worked ok; @PGEN_ABORT@ otherwise.
- *
- * Use: Generates the DSA shared parameters from a given seed value.
- * This can take quite a long time.
- *
- * The algorithm used is a compatible extension of the method
- * described in the DSA standard, FIPS 186. The standard
- * requires that %$q$% be 160 bits in size (i.e., @ql == 160@)
- * and that the length of %$p$% be %$L = 512 + 64l$% for some
- * %$l$%. Neither limitation applies to this implementation.
- */
-
-extern int dsa_gen(dsa_param */*dp*/, unsigned /*ql*/, unsigned /*pl*/,
- unsigned /*steps*/, const void */*k*/, size_t /*sz*/,
- dsa_seed */*sd*/, pgen_proc */*event*/, void */*ectx*/);
-
-/* --- @dsa_checkparam@ --- *
- *
- * Arguments: @keycheck *kc@ = keycheck state
- * @const dsa_param *dp@ = pointer to the parameter set
- * @const dsa_seed *ds@ = pointer to seed information
- *
- * Returns: Zero if all OK, or return status from function.
- *
- * Use: Checks a set of DSA parameters for consistency and security.
- */
-
-extern int dsa_checkparam(keycheck */*kc*/, const dsa_param */*dp*/,
- const dsa_seed */*ds*/);
-
-/* --- @dsa_h2n@ --- *
- *
- * Arguments: @mp *d@ = destination integer
- * @mp *r@ = order of the DSA group
- * @const void *h@ = pointer to message hash
- * @size_t hsz@ = size (in bytes) of the hash output
- *
- * Returns: Resulting integer.
- *
- * Use: Converts a hash to an integer in the demented way necessary
- * for DSA/ECDSA. This is, of course, completely insane, but
- * there you go.
- */
-
-extern mp *dsa_h2n(mp */*d*/, mp */*r*/, const void */*h*/, size_t /*hsz*/);
-
-/* --- @dsa_mksig@ --- *
- *
- * Arguments: @const dsa_param *dp@ = pointer to DSA parameters
- * @mp *a@ = secret signing key
- * @mp *m@ = message to be signed
- * @mp *k@ = random data
- * @mp **rr, **ss@ = where to put output parameters
- *
- * Returns: ---
- *
- * Use: Computes a DSA signature of a message.
- */
-
-extern void dsa_mksig(const dsa_param */*dp*/, mp */*a*/,
- mp */*m*/, mp */*k*/,
- mp **/*rr*/, mp **/*ss*/);
-
-/* --- @dsa_sign@ --- *
- *
- * Arguments: @dsa_param *dp@ = pointer to DSA parameters
- * @mp *a@ = pointer to secret signing key
- * @const void *m@ = pointer to message
- * @size_t msz@ = size of the message
- * @const void *k@ = secret random data for securing signature
- * @size_t ksz@ = size of secret data
- * @void *r@ = pointer to output space for @r@
- * @size_t rsz@ = size of output space for @r@
- * @void *s@ = pointer to output space for @s@
- * @size_t ssz@ = size of output space for @s@
- *
- * Returns: ---
- *
- * Use: Signs a message, storing the results in a big-endian binary
- * form.
- */
-
-extern void dsa_sign(dsa_param */*dp*/, mp */*a*/,
- const void */*m*/, size_t /*msz*/,
- const void */*k*/, size_t /*ksz*/,
- void */*r*/, size_t /*rsz*/,
- void */*s*/, size_t /*ssz*/);
-
-/* --- @dsa_vrfy@ --- *
- *
- * Arguments: @const dsa_param *dp@ = pointer to DSA parameters
- * @mp *y@ = public verification key
- * @mp *m@ = message which was signed
- * @mp *r, *s@ = the signature
- *
- * Returns: Zero if the signature is a forgery, nonzero if it's valid.
- *
- * Use: Verifies a DSA digital signature.
- */
-
-extern int dsa_vrfy(const dsa_param */*dp*/, mp */*y*/,
- mp */*m*/, mp */*r*/, mp */*s*/);
-
-/* --- @dsa_verify@ --- *
- *
- * Arguments: @const dsa_param *dp@ = pointer to DSA parameters
- * @mp *y@ = public verification key
- * @const void *m@ = pointer to message block
- * @size_t msz@ = size of message block
- * @const void *r@ = pointer to @r@ signature half
- * @size_t rsz@ = size of @r@
- * @const void *s@ = pointer to @s@ signature half
- * @size_t ssz@ = size of @s@
- *
- * Returns: Zero if the signature is a forgery, nonzero if it's valid.
- *
- * Use: Verifies a DSA digital signature.
- */
-
-extern int dsa_verify(const dsa_param */*dp*/, mp */*y*/,
- const void */*m*/, size_t /*msz*/,
- const void */*r*/, size_t /*rsz*/,
- const void */*s*/, size_t /*ssz*/);
-
-/*----- That's all, folks -------------------------------------------------*/
-
-#ifdef __cplusplus
- }
-#endif
-
-#endif
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