475 lines
13 KiB
C
475 lines
13 KiB
C
/**********************************************************************
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* gost2001.c *
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* Copyright (c) 2005-2006 Cryptocom LTD *
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* This file is distributed under the same license as OpenSSL *
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* *
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* Implementation of GOST R 34.10-2001 *
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* Requires OpenSSL 0.9.9 for compilation *
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**********************************************************************/
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#include "gost_lcl.h"
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#include "gost_params.h"
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#include <string.h>
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#include <openssl/rand.h>
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#include <openssl/ecdsa.h>
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#include <openssl/err.h>
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#include "e_gost_err.h"
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#ifdef DEBUG_SIGN
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extern
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void dump_signature(const char *message, const unsigned char *buffer,
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size_t len);
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void dump_dsa_sig(const char *message, DSA_SIG *sig);
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#else
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# define dump_signature(a,b,c)
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# define dump_dsa_sig(a,b)
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#endif
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/*
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* Fills EC_KEY structure hidden in the app_data field of DSA structure
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* with parameter information, extracted from parameter array in
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* params.c file.
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*
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* Also fils DSA->q field with copy of EC_GROUP order field to make
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* DSA_size function work
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*/
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int fill_GOST2001_params(EC_KEY *eckey, int nid)
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{
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R3410_2001_params *params = R3410_2001_paramset;
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EC_GROUP *grp = NULL;
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BIGNUM *p = NULL, *q = NULL, *a = NULL, *b = NULL, *x = NULL, *y = NULL;
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EC_POINT *P = NULL;
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BN_CTX *ctx = BN_CTX_new();
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int ok = 0;
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if(!ctx) {
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GOSTerr(GOST_F_FILL_GOST2001_PARAMS, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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BN_CTX_start(ctx);
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p = BN_CTX_get(ctx);
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a = BN_CTX_get(ctx);
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b = BN_CTX_get(ctx);
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x = BN_CTX_get(ctx);
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y = BN_CTX_get(ctx);
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q = BN_CTX_get(ctx);
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if(!p || !a || !b || !x || !y || !q) {
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GOSTerr(GOST_F_FILL_GOST2001_PARAMS, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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while (params->nid != NID_undef && params->nid != nid)
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params++;
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if (params->nid == NID_undef) {
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GOSTerr(GOST_F_FILL_GOST2001_PARAMS,
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GOST_R_UNSUPPORTED_PARAMETER_SET);
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goto err;
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}
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if(!BN_hex2bn(&p, params->p)
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|| !BN_hex2bn(&a, params->a)
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|| !BN_hex2bn(&b, params->b)) {
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GOSTerr(GOST_F_FILL_GOST2001_PARAMS,
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ERR_R_INTERNAL_ERROR);
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goto err;
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}
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grp = EC_GROUP_new_curve_GFp(p, a, b, ctx);
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if(!grp) {
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GOSTerr(GOST_F_FILL_GOST2001_PARAMS, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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P = EC_POINT_new(grp);
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if(!P) {
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GOSTerr(GOST_F_FILL_GOST2001_PARAMS, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if(!BN_hex2bn(&x, params->x)
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|| !BN_hex2bn(&y, params->y)
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|| !EC_POINT_set_affine_coordinates_GFp(grp, P, x, y, ctx)
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|| !BN_hex2bn(&q, params->q)) {
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GOSTerr(GOST_F_FILL_GOST2001_PARAMS, ERR_R_INTERNAL_ERROR);
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goto err;
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}
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#ifdef DEBUG_KEYS
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fprintf(stderr, "Set params index %d oid %s\nq=",
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(params - R3410_2001_paramset), OBJ_nid2sn(params->nid));
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BN_print_fp(stderr, q);
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fprintf(stderr, "\n");
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#endif
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if(!EC_GROUP_set_generator(grp, P, q, NULL)) {
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GOSTerr(GOST_F_FILL_GOST2001_PARAMS, ERR_R_INTERNAL_ERROR);
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goto err;
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}
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EC_GROUP_set_curve_name(grp, params->nid);
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if(!EC_KEY_set_group(eckey, grp)) {
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GOSTerr(GOST_F_FILL_GOST2001_PARAMS, ERR_R_INTERNAL_ERROR);
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goto err;
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}
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ok = 1;
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err:
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if (P) EC_POINT_free(P);
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if (grp) EC_GROUP_free(grp);
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if (ctx) {
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BN_CTX_end(ctx);
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BN_CTX_free(ctx);
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}
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return ok;
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}
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/*
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* Computes gost2001 signature as DSA_SIG structure
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*
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*
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*/
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DSA_SIG *gost2001_do_sign(const unsigned char *dgst, int dlen, EC_KEY *eckey)
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{
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DSA_SIG *newsig = NULL, *ret = NULL;
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BIGNUM *md = hashsum2bn(dgst);
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BIGNUM *order = NULL;
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const EC_GROUP *group;
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const BIGNUM *priv_key;
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BIGNUM *r = NULL, *s = NULL, *X = NULL, *tmp = NULL, *tmp2 = NULL, *k =
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NULL, *e = NULL;
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EC_POINT *C = NULL;
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BN_CTX *ctx = BN_CTX_new();
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if(!ctx || !md) {
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GOSTerr(GOST_F_GOST2001_DO_SIGN, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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BN_CTX_start(ctx);
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OPENSSL_assert(dlen == 32);
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newsig = DSA_SIG_new();
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if (!newsig) {
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GOSTerr(GOST_F_GOST2001_DO_SIGN, GOST_R_NO_MEMORY);
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goto err;
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}
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group = EC_KEY_get0_group(eckey);
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if(!group) {
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GOSTerr(GOST_F_GOST2001_DO_SIGN, ERR_R_INTERNAL_ERROR);
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goto err;
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}
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order = BN_CTX_get(ctx);
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if(!order || !EC_GROUP_get_order(group, order, ctx)) {
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GOSTerr(GOST_F_GOST2001_DO_SIGN, ERR_R_INTERNAL_ERROR);
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goto err;
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}
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priv_key = EC_KEY_get0_private_key(eckey);
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if(!priv_key) {
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GOSTerr(GOST_F_GOST2001_DO_SIGN, ERR_R_INTERNAL_ERROR);
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goto err;
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}
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e = BN_CTX_get(ctx);
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if(!e || !BN_mod(e, md, order, ctx)) {
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GOSTerr(GOST_F_GOST2001_DO_SIGN, ERR_R_INTERNAL_ERROR);
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goto err;
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}
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#ifdef DEBUG_SIGN
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fprintf(stderr, "digest as bignum=");
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BN_print_fp(stderr, md);
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fprintf(stderr, "\ndigest mod q=");
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BN_print_fp(stderr, e);
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fprintf(stderr, "\n");
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#endif
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if (BN_is_zero(e)) {
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BN_one(e);
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}
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k = BN_CTX_get(ctx);
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C = EC_POINT_new(group);
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if(!k || !C) {
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GOSTerr(GOST_F_GOST2001_DO_SIGN, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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do {
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do {
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if (!BN_rand_range(k, order)) {
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GOSTerr(GOST_F_GOST2001_DO_SIGN,
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GOST_R_RANDOM_NUMBER_GENERATOR_FAILED);
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goto err;
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}
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if (!EC_POINT_mul(group, C, k, NULL, NULL, ctx)) {
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GOSTerr(GOST_F_GOST2001_DO_SIGN, ERR_R_EC_LIB);
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goto err;
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}
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if (!X)
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X = BN_CTX_get(ctx);
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if (!r)
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r = BN_CTX_get(ctx);
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if (!X || !r) {
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GOSTerr(GOST_F_GOST2001_DO_SIGN, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (!EC_POINT_get_affine_coordinates_GFp(group, C, X, NULL, ctx)) {
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GOSTerr(GOST_F_GOST2001_DO_SIGN, ERR_R_EC_LIB);
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goto err;
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}
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if(!BN_nnmod(r, X, order, ctx)) {
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GOSTerr(GOST_F_GOST2001_DO_SIGN, ERR_R_INTERNAL_ERROR);
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goto err;
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}
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}
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while (BN_is_zero(r));
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/* s = (r*priv_key+k*e) mod order */
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if (!tmp)
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tmp = BN_CTX_get(ctx);
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if (!tmp2)
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tmp2 = BN_CTX_get(ctx);
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if (!s)
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s = BN_CTX_get(ctx);
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if (!tmp || !tmp2 || !s) {
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GOSTerr(GOST_F_GOST2001_DO_SIGN, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if(!BN_mod_mul(tmp, priv_key, r, order, ctx)
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|| !BN_mod_mul(tmp2, k, e, order, ctx)
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|| !BN_mod_add(s, tmp, tmp2, order, ctx)) {
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GOSTerr(GOST_F_GOST2001_DO_SIGN, ERR_R_INTERNAL_ERROR);
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goto err;
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}
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}
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while (BN_is_zero(s));
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newsig->s = BN_dup(s);
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newsig->r = BN_dup(r);
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if(!newsig->s || !newsig->r) {
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GOSTerr(GOST_F_GOST2001_DO_SIGN, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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ret = newsig;
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err:
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if(ctx) {
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BN_CTX_end(ctx);
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BN_CTX_free(ctx);
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}
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if (C) EC_POINT_free(C);
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if (md) BN_free(md);
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if (!ret && newsig) {
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DSA_SIG_free(newsig);
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}
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return ret;
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}
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/*
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* Verifies gost 2001 signature
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*
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*/
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int gost2001_do_verify(const unsigned char *dgst, int dgst_len,
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DSA_SIG *sig, EC_KEY *ec)
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{
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BN_CTX *ctx = BN_CTX_new();
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const EC_GROUP *group = EC_KEY_get0_group(ec);
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BIGNUM *order;
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BIGNUM *md = NULL, *e = NULL, *R = NULL, *v = NULL, *z1 = NULL, *z2 =
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NULL;
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BIGNUM *X = NULL, *tmp = NULL;
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EC_POINT *C = NULL;
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const EC_POINT *pub_key = NULL;
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int ok = 0;
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if(!ctx || !group) {
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GOSTerr(GOST_F_GOST2001_DO_VERIFY, ERR_R_INTERNAL_ERROR);
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goto err;
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}
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BN_CTX_start(ctx);
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order = BN_CTX_get(ctx);
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e = BN_CTX_get(ctx);
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z1 = BN_CTX_get(ctx);
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z2 = BN_CTX_get(ctx);
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tmp = BN_CTX_get(ctx);
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X = BN_CTX_get(ctx);
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R = BN_CTX_get(ctx);
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v = BN_CTX_get(ctx);
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if(!order || !e || !z1 || !z2 || !tmp || !X || !R || !v) {
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GOSTerr(GOST_F_GOST2001_DO_VERIFY, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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pub_key = EC_KEY_get0_public_key(ec);
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if(!pub_key || !EC_GROUP_get_order(group, order, ctx)) {
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GOSTerr(GOST_F_GOST2001_DO_VERIFY, ERR_R_INTERNAL_ERROR);
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goto err;
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}
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if (BN_is_zero(sig->s) || BN_is_zero(sig->r) ||
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(BN_cmp(sig->s, order) >= 1) || (BN_cmp(sig->r, order) >= 1)) {
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GOSTerr(GOST_F_GOST2001_DO_VERIFY,
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GOST_R_SIGNATURE_PARTS_GREATER_THAN_Q);
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goto err;
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}
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md = hashsum2bn(dgst);
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if(!md || !BN_mod(e, md, order, ctx)) {
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GOSTerr(GOST_F_GOST2001_DO_VERIFY, ERR_R_INTERNAL_ERROR);
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goto err;
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}
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#ifdef DEBUG_SIGN
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fprintf(stderr, "digest as bignum: ");
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BN_print_fp(stderr, md);
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fprintf(stderr, "\ndigest mod q: ");
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BN_print_fp(stderr, e);
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#endif
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if (BN_is_zero(e) && !BN_one(e)) {
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GOSTerr(GOST_F_GOST2001_DO_VERIFY, ERR_R_INTERNAL_ERROR);
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goto err;
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}
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v = BN_mod_inverse(v, e, order, ctx);
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if(!v
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|| !BN_mod_mul(z1, sig->s, v, order, ctx)
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|| !BN_sub(tmp, order, sig->r)
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|| !BN_mod_mul(z2, tmp, v, order, ctx)) {
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GOSTerr(GOST_F_GOST2001_DO_VERIFY, ERR_R_INTERNAL_ERROR);
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goto err;
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}
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#ifdef DEBUG_SIGN
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fprintf(stderr, "\nInverted digest value: ");
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BN_print_fp(stderr, v);
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fprintf(stderr, "\nz1: ");
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BN_print_fp(stderr, z1);
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fprintf(stderr, "\nz2: ");
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BN_print_fp(stderr, z2);
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#endif
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C = EC_POINT_new(group);
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if (!C) {
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GOSTerr(GOST_F_GOST2001_DO_VERIFY, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (!EC_POINT_mul(group, C, z1, pub_key, z2, ctx)) {
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GOSTerr(GOST_F_GOST2001_DO_VERIFY, ERR_R_EC_LIB);
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goto err;
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}
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if (!EC_POINT_get_affine_coordinates_GFp(group, C, X, NULL, ctx)) {
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GOSTerr(GOST_F_GOST2001_DO_VERIFY, ERR_R_EC_LIB);
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goto err;
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}
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if(!BN_mod(R, X, order, ctx)) {
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GOSTerr(GOST_F_GOST2001_DO_VERIFY, ERR_R_INTERNAL_ERROR);
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goto err;
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}
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#ifdef DEBUG_SIGN
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fprintf(stderr, "\nX=");
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BN_print_fp(stderr, X);
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fprintf(stderr, "\nX mod q=");
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BN_print_fp(stderr, R);
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fprintf(stderr, "\n");
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#endif
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if (BN_cmp(R, sig->r) != 0) {
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GOSTerr(GOST_F_GOST2001_DO_VERIFY, GOST_R_SIGNATURE_MISMATCH);
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} else {
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ok = 1;
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}
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err:
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if (C) EC_POINT_free(C);
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if (ctx) {
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BN_CTX_end(ctx);
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BN_CTX_free(ctx);
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}
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if (md) BN_free(md);
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return ok;
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}
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/*
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* Computes GOST R 34.10-2001 public key
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*
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*
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*/
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int gost2001_compute_public(EC_KEY *ec)
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{
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const EC_GROUP *group = EC_KEY_get0_group(ec);
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EC_POINT *pub_key = NULL;
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const BIGNUM *priv_key = NULL;
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BN_CTX *ctx = NULL;
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int ok = 0;
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if (!group) {
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GOSTerr(GOST_F_GOST2001_COMPUTE_PUBLIC,
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GOST_R_KEY_IS_NOT_INITIALIZED);
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return 0;
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}
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ctx = BN_CTX_new();
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if(!ctx) {
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GOSTerr(GOST_F_GOST2001_COMPUTE_PUBLIC, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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BN_CTX_start(ctx);
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if (!(priv_key = EC_KEY_get0_private_key(ec))) {
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GOSTerr(GOST_F_GOST2001_COMPUTE_PUBLIC, ERR_R_EC_LIB);
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goto err;
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}
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pub_key = EC_POINT_new(group);
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if(!pub_key) {
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GOSTerr(GOST_F_GOST2001_COMPUTE_PUBLIC, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (!EC_POINT_mul(group, pub_key, priv_key, NULL, NULL, ctx)) {
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GOSTerr(GOST_F_GOST2001_COMPUTE_PUBLIC, ERR_R_EC_LIB);
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goto err;
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}
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if (!EC_KEY_set_public_key(ec, pub_key)) {
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GOSTerr(GOST_F_GOST2001_COMPUTE_PUBLIC, ERR_R_EC_LIB);
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goto err;
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}
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ok = 256;
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err:
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if (pub_key) EC_POINT_free(pub_key);
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if (ctx) {
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BN_CTX_end(ctx);
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BN_CTX_free(ctx);
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}
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return ok;
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}
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/*
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*
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* Generates GOST R 34.10-2001 keypair
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*
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*
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*/
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int gost2001_keygen(EC_KEY *ec)
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{
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BIGNUM *order = BN_new(), *d = BN_new();
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const EC_GROUP *group = NULL;
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if (order == NULL || d == NULL) {
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GOSTerr(GOST_F_GOST2001_KEYGEN, ERR_R_MALLOC_FAILURE);
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BN_free(d);
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BN_free(order);
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return 0;
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}
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group = EC_KEY_get0_group(ec);
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if(!group || !EC_GROUP_get_order(group, order, NULL)) {
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GOSTerr(GOST_F_GOST2001_KEYGEN, ERR_R_INTERNAL_ERROR);
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BN_free(d);
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BN_free(order);
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return 0;
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}
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do {
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if (!BN_rand_range(d, order)) {
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GOSTerr(GOST_F_GOST2001_KEYGEN,
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GOST_R_RANDOM_NUMBER_GENERATOR_FAILED);
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BN_free(d);
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BN_free(order);
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return 0;
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}
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}
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while (BN_is_zero(d));
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if(!EC_KEY_set_private_key(ec, d)) {
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GOSTerr(GOST_F_GOST2001_KEYGEN, ERR_R_INTERNAL_ERROR);
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BN_free(d);
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BN_free(order);
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return 0;
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}
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BN_free(d);
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BN_free(order);
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return gost2001_compute_public(ec);
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}
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