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416 lines
13 KiB
C
416 lines
13 KiB
C
/*
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*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is the Netscape security libraries.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1994-2000 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the
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* terms of the GNU General Public License Version 2 or later (the
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* "GPL"), in which case the provisions of the GPL are applicable
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* instead of those above. If you wish to allow use of your
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* version of this file only under the terms of the GPL and not to
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* allow others to use your version of this file under the MPL,
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* indicate your decision by deleting the provisions above and
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* replace them with the notice and other provisions required by
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* the GPL. If you do not delete the provisions above, a recipient
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* may use your version of this file under either the MPL or the
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* GPL.
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*
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* $Id: dsa.c,v 1.7 2001/01/12 14:30:44 mcgreer%netscape.com Exp $
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*/
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#include "secerr.h"
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#include "prtypes.h"
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#include "prinit.h"
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#include "blapi.h"
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#include "nssilock.h"
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#include "secitem.h"
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#include "blapi.h"
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#include "mpi.h"
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/* XXX to be replaced by define in blapit.h */
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#define NSS_FREEBL_DSA_DEFAULT_CHUNKSIZE 2048
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#define CHECKOK(func) if (MP_OKAY > (err = func)) goto cleanup
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#define SECITEM_TO_MPINT(it, mp) \
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CHECKOK(mp_read_unsigned_octets((mp), (it).data, (it).len))
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/* DSA-specific random number functions defined in prng_fips1861.c. */
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extern SECStatus
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DSA_RandomUpdate(void *data, size_t bytes, unsigned char *q);
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extern SECStatus
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DSA_GenerateGlobalRandomBytes(void *dest, size_t len, unsigned char *q);
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static void translate_mpi_error(mp_err err)
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{
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switch (err) {
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case MP_MEM: PORT_SetError(SEC_ERROR_NO_MEMORY); break;
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case MP_RANGE: PORT_SetError(SEC_ERROR_BAD_DATA); break;
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case MP_BADARG: PORT_SetError(SEC_ERROR_INVALID_ARGS); break;
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default: PORT_SetError(SEC_ERROR_LIBRARY_FAILURE); break;
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}
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}
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SECStatus
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dsa_NewKey(const PQGParams *params, DSAPrivateKey **privKey,
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const unsigned char *xb)
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{
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unsigned int y_len;
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mp_int p, g;
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mp_int x, y;
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mp_err err;
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PRArenaPool *arena;
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DSAPrivateKey *key;
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/* Check args. */
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if (!params || !privKey) {
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PORT_SetError(SEC_ERROR_INVALID_ARGS);
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return SECFailure;
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}
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/* Initialize an arena for the DSA key. */
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arena = PORT_NewArena(NSS_FREEBL_DSA_DEFAULT_CHUNKSIZE);
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if (!arena) {
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PORT_SetError(SEC_ERROR_NO_MEMORY);
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return SECFailure;
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}
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key = (DSAPrivateKey *)PORT_ArenaZAlloc(arena, sizeof(DSAPrivateKey));
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if (!key) {
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PORT_SetError(SEC_ERROR_NO_MEMORY);
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PORT_FreeArena(arena, PR_TRUE);
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return SECFailure;
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}
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key->params.arena = arena;
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/* Initialize MPI integers. */
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MP_DIGITS(&p) = 0;
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MP_DIGITS(&g) = 0;
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MP_DIGITS(&x) = 0;
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MP_DIGITS(&y) = 0;
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CHECKOK( mp_init(&p) );
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CHECKOK( mp_init(&g) );
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CHECKOK( mp_init(&x) );
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CHECKOK( mp_init(&y) );
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/* Copy over the PQG params */
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CHECKOK( SECITEM_CopyItem(arena, &key->params.prime, ¶ms->prime) );
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CHECKOK( SECITEM_CopyItem(arena, &key->params.subPrime, ¶ms->subPrime));
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CHECKOK( SECITEM_CopyItem(arena, &key->params.base, ¶ms->base) );
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/* Convert stored p, g, and received x into MPI integers. */
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SECITEM_TO_MPINT(params->prime, &p);
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SECITEM_TO_MPINT(params->base, &g);
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CHECKOK( mp_read_unsigned_octets(&x, xb, DSA_SUBPRIME_LEN) );
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/* Store x in private key */
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SECITEM_AllocItem(arena, &key->privateValue, DSA_SUBPRIME_LEN);
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memcpy(key->privateValue.data, xb, DSA_SUBPRIME_LEN);
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/* Compute public key y = g**x mod p */
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CHECKOK( mp_exptmod(&g, &x, &p, &y) );
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/* Store y in public key */
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y_len = mp_unsigned_octet_size(&y);
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SECITEM_AllocItem(arena, &key->publicValue, y_len);
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err = mp_to_unsigned_octets(&y, key->publicValue.data, y_len);
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/* mp_to_unsigned_octets returns bytes written (y_len) if okay */
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if (err < 0) goto cleanup; else err = MP_OKAY;
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*privKey = key;
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key = NULL;
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cleanup:
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mp_clear(&p);
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mp_clear(&g);
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mp_clear(&x);
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mp_clear(&y);
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if (key)
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PORT_FreeArena(key->params.arena, PR_TRUE);
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if (err) {
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translate_mpi_error(err);
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return SECFailure;
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}
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return SECSuccess;
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}
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/*
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** Generate and return a new DSA public and private key pair,
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** both of which are encoded into a single DSAPrivateKey struct.
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** "params" is a pointer to the PQG parameters for the domain
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** Uses a random seed.
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*/
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SECStatus
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DSA_NewKey(const PQGParams *params, DSAPrivateKey **privKey)
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{
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SECStatus rv;
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unsigned char seed[DSA_SUBPRIME_LEN];
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/* Generate seed bytes for x according to FIPS 186-1 appendix 3 */
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if (DSA_GenerateGlobalRandomBytes(seed, DSA_SUBPRIME_LEN,
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params->subPrime.data))
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return SECFailure;
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/* Generate a new DSA key using random seed. */
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rv = dsa_NewKey(params, privKey, seed);
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return rv;
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}
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/* For FIPS compliance testing. Seed must be exactly 20 bytes long */
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SECStatus
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DSA_NewKeyFromSeed(const PQGParams *params,
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const unsigned char *seed,
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DSAPrivateKey **privKey)
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{
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SECStatus rv;
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rv = dsa_NewKey(params, privKey, seed);
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return rv;
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}
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SECStatus
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dsa_SignDigest(DSAPrivateKey *key, SECItem *signature, const SECItem *digest,
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const unsigned char *kb)
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{
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mp_int p, q, g; /* PQG parameters */
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mp_int x, k; /* private key & pseudo-random integer */
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mp_int r, s; /* tuple (r, s) is signature) */
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mp_err err;
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/* FIPS-compliance dictates that digest is a SHA1 hash. */
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/* Check args. */
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if (!key || !signature || !digest ||
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(signature->len != DSA_SIGNATURE_LEN) ||
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(digest->len != SHA1_LENGTH)) {
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PORT_SetError(SEC_ERROR_INVALID_ARGS);
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return SECFailure;
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}
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/* Initialize MPI integers. */
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MP_DIGITS(&p) = 0;
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MP_DIGITS(&q) = 0;
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MP_DIGITS(&g) = 0;
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MP_DIGITS(&x) = 0;
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MP_DIGITS(&k) = 0;
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MP_DIGITS(&r) = 0;
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MP_DIGITS(&s) = 0;
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CHECKOK( mp_init(&p) );
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CHECKOK( mp_init(&q) );
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CHECKOK( mp_init(&g) );
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CHECKOK( mp_init(&x) );
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CHECKOK( mp_init(&k) );
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CHECKOK( mp_init(&r) );
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CHECKOK( mp_init(&s) );
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/*
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** Convert stored PQG and private key into MPI integers.
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*/
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SECITEM_TO_MPINT(key->params.prime, &p);
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SECITEM_TO_MPINT(key->params.subPrime, &q);
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SECITEM_TO_MPINT(key->params.base, &g);
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SECITEM_TO_MPINT(key->privateValue, &x);
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CHECKOK( mp_read_unsigned_octets(&k, kb, DSA_SUBPRIME_LEN) );
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/*
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** FIPS 186-1, Section 5, Step 1
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**
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** r = (g**k mod p) mod q
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*/
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CHECKOK( mp_exptmod(&g, &k, &p, &r) ); /* r = g**k mod p */
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CHECKOK( mp_mod(&r, &q, &r) ); /* r = r mod q */
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/*
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** FIPS 186-1, Section 5, Step 2
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**
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** s = (k**-1 * (SHA1(M) + x*r)) mod q
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*/
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SECITEM_TO_MPINT(*digest, &s); /* s = SHA1(M) */
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CHECKOK( mp_invmod(&k, &q, &k) ); /* k = k**-1 mod q */
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CHECKOK( mp_mulmod(&x, &r, &q, &x) ); /* x = x * r mod q */
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CHECKOK( mp_addmod(&s, &x, &q, &s) ); /* s = s + x mod q */
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CHECKOK( mp_mulmod(&s, &k, &q, &s) ); /* s = s * k mod q */
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/*
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** verify r != 0 and s != 0
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** mentioned as optional in FIPS 186-1.
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*/
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if (mp_cmp_z(&r) == 0 || mp_cmp_z(&s) == 0) {
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PORT_SetError(SEC_ERROR_NEED_RANDOM);
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err = MP_UNDEF;
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goto cleanup;
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}
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/*
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** Step 4
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**
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** Signature is tuple (r, s)
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*/
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err = mp_to_fixlen_octets(&r, signature->data, DSA_SUBPRIME_LEN);
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if (err < 0) goto cleanup; else err = MP_OKAY;
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err = mp_to_fixlen_octets(&s, signature->data + DSA_SUBPRIME_LEN,
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DSA_SUBPRIME_LEN);
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if (err < 0) goto cleanup; else err = MP_OKAY;
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cleanup:
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mp_clear(&p);
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mp_clear(&q);
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mp_clear(&g);
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mp_clear(&x);
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mp_clear(&k);
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mp_clear(&r);
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mp_clear(&s);
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if (err) {
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translate_mpi_error(err);
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return SECFailure;
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}
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return SECSuccess;
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}
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/* signature is caller-supplied buffer of at least 20 bytes.
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** On input, signature->len == size of buffer to hold signature.
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** digest->len == size of digest.
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** On output, signature->len == size of signature in buffer.
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** Uses a random seed.
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*/
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SECStatus
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DSA_SignDigest(DSAPrivateKey *key, SECItem *signature, const SECItem *digest)
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{
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SECStatus rv;
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int prerr = 0;
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unsigned char KSEED[DSA_SUBPRIME_LEN];
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rv = DSA_GenerateGlobalRandomBytes(KSEED, DSA_SUBPRIME_LEN,
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key->params.subPrime.data);
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if (rv) return rv;
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do {
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rv = dsa_SignDigest(key, signature, digest, KSEED);
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if (rv) prerr = PORT_GetError();
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} while (prerr == SEC_ERROR_NEED_RANDOM);
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return rv;
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}
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/* For FIPS compliance testing. Seed must be exactly 20 bytes. */
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SECStatus
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DSA_SignDigestWithSeed(DSAPrivateKey * key,
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SECItem * signature,
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const SECItem * digest,
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const unsigned char * seed)
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{
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SECStatus rv;
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rv = dsa_SignDigest(key, signature, digest, seed);
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return rv;
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}
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/* signature is caller-supplied buffer of at least 20 bytes.
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** On input, signature->len == size of buffer to hold signature.
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** digest->len == size of digest.
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*/
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SECStatus
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DSA_VerifyDigest(DSAPublicKey *key, const SECItem *signature,
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const SECItem *digest)
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{
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/* FIPS-compliance dictates that digest is a SHA1 hash. */
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mp_int p, q, g; /* PQG parameters */
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mp_int r_, s_; /* tuple (r', s') is received signature) */
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mp_int u1, u2, v, w; /* intermediate values used in verification */
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mp_int y; /* public key */
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mp_err err;
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SECStatus verified = SECFailure;
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/* Check args. */
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if (!key || !signature || !digest ||
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(signature->len != DSA_SIGNATURE_LEN) ||
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(digest->len != SHA1_LENGTH)) {
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PORT_SetError(SEC_ERROR_INVALID_ARGS);
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return SECFailure;
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}
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/* Initialize MPI integers. */
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MP_DIGITS(&p) = 0;
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MP_DIGITS(&q) = 0;
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MP_DIGITS(&g) = 0;
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MP_DIGITS(&y) = 0;
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MP_DIGITS(&r_) = 0;
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MP_DIGITS(&s_) = 0;
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MP_DIGITS(&u1) = 0;
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MP_DIGITS(&u2) = 0;
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MP_DIGITS(&v) = 0;
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MP_DIGITS(&w) = 0;
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CHECKOK( mp_init(&p) );
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CHECKOK( mp_init(&q) );
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CHECKOK( mp_init(&g) );
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CHECKOK( mp_init(&y) );
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CHECKOK( mp_init(&r_) );
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CHECKOK( mp_init(&s_) );
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CHECKOK( mp_init(&u1) );
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CHECKOK( mp_init(&u2) );
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CHECKOK( mp_init(&v) );
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CHECKOK( mp_init(&w) );
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/*
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** Convert stored PQG and public key into MPI integers.
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*/
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SECITEM_TO_MPINT(key->params.prime, &p);
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SECITEM_TO_MPINT(key->params.subPrime, &q);
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SECITEM_TO_MPINT(key->params.base, &g);
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SECITEM_TO_MPINT(key->publicValue, &y);
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/*
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** Convert received signature (r', s') into MPI integers.
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*/
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CHECKOK( mp_read_unsigned_octets(&r_, signature->data, DSA_SUBPRIME_LEN) );
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CHECKOK( mp_read_unsigned_octets(&s_, signature->data + DSA_SUBPRIME_LEN,
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DSA_SUBPRIME_LEN) );
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/*
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** Verify that 0 < r' < q and 0 < s' < q
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*/
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if (mp_cmp_z(&r_) <= 0 || mp_cmp_z(&s_) <= 0 ||
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mp_cmp(&r_, &q) >= 0 || mp_cmp(&s_, &q) >= 0)
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goto cleanup; /* will return verified == SECFailure */
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/*
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** FIPS 186-1, Section 6, Step 1
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**
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** w = (s')**-1 mod q
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*/
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CHECKOK( mp_invmod(&s_, &q, &w) ); /* w = (s')**-1 mod q */
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/*
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** FIPS 186-1, Section 6, Step 2
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**
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** u1 = ((SHA1(M')) * w) mod q
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*/
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SECITEM_TO_MPINT(*digest, &u1); /* u1 = SHA1(M') */
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CHECKOK( mp_mulmod(&u1, &w, &q, &u1) ); /* u1 = u1 * w mod q */
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/*
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** FIPS 186-1, Section 6, Step 3
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**
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** u2 = ((r') * w) mod q
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*/
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CHECKOK( mp_mulmod(&r_, &w, &q, &u2) );
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/*
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** FIPS 186-1, Section 6, Step 4
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**
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** v = ((g**u1 * y**u2) mod p) mod q
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*/
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CHECKOK( mp_exptmod(&g, &u1, &p, &g) ); /* g = g**u1 mod p */
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CHECKOK( mp_exptmod(&y, &u2, &p, &y) ); /* y = y**u2 mod p */
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CHECKOK( mp_mulmod(&g, &y, &p, &v) ); /* v = g * y mod p */
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CHECKOK( mp_mod(&v, &q, &v) ); /* v = v mod q */
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/*
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** Verification: v == r'
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*/
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if (mp_cmp(&v, &r_)) {
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PORT_SetError(SEC_ERROR_BAD_SIGNATURE);
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verified = SECFailure; /* Signature failed to verify. */
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} else {
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verified = SECSuccess; /* Signature verified. */
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}
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cleanup:
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mp_clear(&p);
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mp_clear(&q);
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mp_clear(&g);
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mp_clear(&y);
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mp_clear(&r_);
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mp_clear(&s_);
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mp_clear(&u1);
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mp_clear(&u2);
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mp_clear(&v);
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mp_clear(&w);
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if (err) {
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translate_mpi_error(err);
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}
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return verified;
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}
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