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openssl/engines/ccgost/gost_ameth.c
Richard Levitte c6ef15c494 clang on Linux x86_64 complains about unreachable code. 
Reviewed-by: Rich Salz <rsalz@openssl.org>
2015-01-29 01:54:09 +01:00

947 lines
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/**********************************************************************
* gost_ameth.c *
* Copyright (c) 2005-2006 Cryptocom LTD *
* This file is distributed under the same license as OpenSSL *
* *
* Implementation of RFC 4490/4491 ASN1 method *
* for OpenSSL *
* Requires OpenSSL 0.9.9 for compilation *
**********************************************************************/
#include <string.h>
#include <openssl/crypto.h>
#include <openssl/err.h>
#include <openssl/engine.h>
#include <openssl/evp.h>
#include <openssl/asn1.h>
#ifndef OPENSSL_NO_CMS
# include <openssl/cms.h>
#endif
#include "gost_params.h"
#include "gost_lcl.h"
#include "e_gost_err.h"
int gost94_nid_by_params(DSA *p)
{
R3410_params *gost_params;
BIGNUM *q = BN_new();
for (gost_params = R3410_paramset; gost_params->q != NULL; gost_params++) {
BN_dec2bn(&q, gost_params->q);
if (!BN_cmp(q, p->q)) {
BN_free(q);
return gost_params->nid;
}
}
BN_free(q);
return NID_undef;
}
static ASN1_STRING *encode_gost_algor_params(const EVP_PKEY *key)
{
ASN1_STRING *params = ASN1_STRING_new();
GOST_KEY_PARAMS *gkp = GOST_KEY_PARAMS_new();
int pkey_param_nid = NID_undef;
if (!params || !gkp) {
GOSTerr(GOST_F_ENCODE_GOST_ALGOR_PARAMS, ERR_R_MALLOC_FAILURE);
ASN1_STRING_free(params);
params = NULL;
goto err;
}
switch (EVP_PKEY_base_id(key)) {
case NID_id_GostR3410_2001:
pkey_param_nid =
EC_GROUP_get_curve_name(EC_KEY_get0_group
(EVP_PKEY_get0((EVP_PKEY *)key)));
break;
case NID_id_GostR3410_94:
pkey_param_nid =
(int)gost94_nid_by_params(EVP_PKEY_get0((EVP_PKEY *)key));
if (pkey_param_nid == NID_undef) {
GOSTerr(GOST_F_ENCODE_GOST_ALGOR_PARAMS,
GOST_R_INVALID_GOST94_PARMSET);
ASN1_STRING_free(params);
params = NULL;
goto err;
}
break;
}
gkp->key_params = OBJ_nid2obj(pkey_param_nid);
gkp->hash_params = OBJ_nid2obj(NID_id_GostR3411_94_CryptoProParamSet);
/*
* gkp->cipher_params = OBJ_nid2obj(cipher_param_nid);
*/
params->length = i2d_GOST_KEY_PARAMS(gkp, &params->data);
if (params->length <= 0) {
GOSTerr(GOST_F_ENCODE_GOST_ALGOR_PARAMS, ERR_R_MALLOC_FAILURE);
ASN1_STRING_free(params);
params = NULL;
goto err;
}
params->type = V_ASN1_SEQUENCE;
err:
GOST_KEY_PARAMS_free(gkp);
return params;
}
/*
* Parses GOST algorithm parameters from X509_ALGOR and modifies pkey setting
* NID and parameters
*/
static int decode_gost_algor_params(EVP_PKEY *pkey, X509_ALGOR *palg)
{
ASN1_OBJECT *palg_obj = NULL;
int ptype = V_ASN1_UNDEF;
int pkey_nid = NID_undef, param_nid = NID_undef;
void *_pval;
ASN1_STRING *pval = NULL;
const unsigned char *p;
GOST_KEY_PARAMS *gkp = NULL;
X509_ALGOR_get0(&palg_obj, &ptype, &_pval, palg);
pval = _pval;
if (ptype != V_ASN1_SEQUENCE) {
GOSTerr(GOST_F_DECODE_GOST_ALGOR_PARAMS,
GOST_R_BAD_KEY_PARAMETERS_FORMAT);
return 0;
}
p = pval->data;
pkey_nid = OBJ_obj2nid(palg_obj);
gkp = d2i_GOST_KEY_PARAMS(NULL, &p, pval->length);
if (!gkp) {
GOSTerr(GOST_F_DECODE_GOST_ALGOR_PARAMS,
GOST_R_BAD_PKEY_PARAMETERS_FORMAT);
return 0;
}
param_nid = OBJ_obj2nid(gkp->key_params);
GOST_KEY_PARAMS_free(gkp);
EVP_PKEY_set_type(pkey, pkey_nid);
switch (pkey_nid) {
case NID_id_GostR3410_94:
{
DSA *dsa = EVP_PKEY_get0(pkey);
if (!dsa) {
dsa = DSA_new();
if (!EVP_PKEY_assign(pkey, pkey_nid, dsa))
return 0;
}
if (!fill_GOST94_params(dsa, param_nid))
return 0;
break;
}
case NID_id_GostR3410_2001:
{
EC_KEY *ec = EVP_PKEY_get0(pkey);
if (!ec) {
ec = EC_KEY_new();
if (!EVP_PKEY_assign(pkey, pkey_nid, ec))
return 0;
}
if (!fill_GOST2001_params(ec, param_nid))
return 0;
}
}
return 1;
}
static int gost_set_priv_key(EVP_PKEY *pkey, BIGNUM *priv)
{
switch (EVP_PKEY_base_id(pkey)) {
case NID_id_GostR3410_94:
{
DSA *dsa = EVP_PKEY_get0(pkey);
if (!dsa) {
dsa = DSA_new();
EVP_PKEY_assign(pkey, EVP_PKEY_base_id(pkey), dsa);
}
dsa->priv_key = BN_dup(priv);
if (!EVP_PKEY_missing_parameters(pkey))
gost94_compute_public(dsa);
break;
}
case NID_id_GostR3410_2001:
{
EC_KEY *ec = EVP_PKEY_get0(pkey);
if (!ec) {
ec = EC_KEY_new();
EVP_PKEY_assign(pkey, EVP_PKEY_base_id(pkey), ec);
}
if (!EC_KEY_set_private_key(ec, priv))
return 0;
if (!EVP_PKEY_missing_parameters(pkey))
gost2001_compute_public(ec);
break;
}
}
return 1;
}
BIGNUM *gost_get0_priv_key(const EVP_PKEY *pkey)
{
switch (EVP_PKEY_base_id(pkey)) {
case NID_id_GostR3410_94:
{
DSA *dsa = EVP_PKEY_get0((EVP_PKEY *)pkey);
if (!dsa) {
return NULL;
}
if (!dsa->priv_key)
return NULL;
return dsa->priv_key;
}
case NID_id_GostR3410_2001:
{
EC_KEY *ec = EVP_PKEY_get0((EVP_PKEY *)pkey);
const BIGNUM *priv;
if (!ec) {
return NULL;
}
if (!(priv = EC_KEY_get0_private_key(ec)))
return NULL;
return (BIGNUM *)priv;
}
}
return NULL;
}
static int pkey_ctrl_gost(EVP_PKEY *pkey, int op, long arg1, void *arg2)
{
switch (op) {
case ASN1_PKEY_CTRL_PKCS7_SIGN:
if (arg1 == 0) {
X509_ALGOR *alg1 = NULL, *alg2 = NULL;
int nid = EVP_PKEY_base_id(pkey);
PKCS7_SIGNER_INFO_get0_algs((PKCS7_SIGNER_INFO *)arg2,
NULL, &alg1, &alg2);
X509_ALGOR_set0(alg1, OBJ_nid2obj(NID_id_GostR3411_94),
V_ASN1_NULL, 0);
if (nid == NID_undef) {
return (-1);
}
X509_ALGOR_set0(alg2, OBJ_nid2obj(nid), V_ASN1_NULL, 0);
}
return 1;
#ifndef OPENSSL_NO_CMS
case ASN1_PKEY_CTRL_CMS_SIGN:
if (arg1 == 0) {
X509_ALGOR *alg1 = NULL, *alg2 = NULL;
int nid = EVP_PKEY_base_id(pkey);
CMS_SignerInfo_get0_algs((CMS_SignerInfo *)arg2,
NULL, NULL, &alg1, &alg2);
X509_ALGOR_set0(alg1, OBJ_nid2obj(NID_id_GostR3411_94),
V_ASN1_NULL, 0);
if (nid == NID_undef) {
return (-1);
}
X509_ALGOR_set0(alg2, OBJ_nid2obj(nid), V_ASN1_NULL, 0);
}
return 1;
#endif
case ASN1_PKEY_CTRL_PKCS7_ENCRYPT:
if (arg1 == 0) {
X509_ALGOR *alg;
ASN1_STRING *params = encode_gost_algor_params(pkey);
if (!params) {
return -1;
}
PKCS7_RECIP_INFO_get0_alg((PKCS7_RECIP_INFO *)arg2, &alg);
X509_ALGOR_set0(alg, OBJ_nid2obj(pkey->type),
V_ASN1_SEQUENCE, params);
}
return 1;
#ifndef OPENSSL_NO_CMS
case ASN1_PKEY_CTRL_CMS_ENVELOPE:
if (arg1 == 0) {
X509_ALGOR *alg = NULL;
ASN1_STRING *params = encode_gost_algor_params(pkey);
if (!params) {
return -1;
}
CMS_RecipientInfo_ktri_get0_algs((CMS_RecipientInfo *)arg2, NULL,
NULL, &alg);
X509_ALGOR_set0(alg, OBJ_nid2obj(pkey->type), V_ASN1_SEQUENCE,
params);
}
return 1;
#endif
case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
*(int *)arg2 = NID_id_GostR3411_94;
return 2;
}
return -2;
}
/* --------------------- free functions * ------------------------------*/
static void pkey_free_gost94(EVP_PKEY *key)
{
if (key->pkey.dsa) {
DSA_free(key->pkey.dsa);
}
}
static void pkey_free_gost01(EVP_PKEY *key)
{
if (key->pkey.ec) {
EC_KEY_free(key->pkey.ec);
}
}
/* ------------------ private key functions -----------------------------*/
static int priv_decode_gost(EVP_PKEY *pk, PKCS8_PRIV_KEY_INFO *p8inf)
{
const unsigned char *pkey_buf = NULL, *p = NULL;
int priv_len = 0;
BIGNUM *pk_num = NULL;
int ret = 0;
X509_ALGOR *palg = NULL;
ASN1_OBJECT *palg_obj = NULL;
ASN1_INTEGER *priv_key = NULL;
if (!PKCS8_pkey_get0(&palg_obj, &pkey_buf, &priv_len, &palg, p8inf))
return 0;
p = pkey_buf;
if (!decode_gost_algor_params(pk, palg)) {
return 0;
}
if (V_ASN1_OCTET_STRING == *p) {
/* New format - Little endian octet string */
unsigned char rev_buf[32];
int i;
ASN1_OCTET_STRING *s = d2i_ASN1_OCTET_STRING(NULL, &p, priv_len);
if (!s || s->length != 32) {
GOSTerr(GOST_F_PRIV_DECODE_GOST, EVP_R_DECODE_ERROR);
return 0;
}
for (i = 0; i < 32; i++) {
rev_buf[31 - i] = s->data[i];
}
ASN1_STRING_free(s);
pk_num = getbnfrombuf(rev_buf, 32);
} else {
priv_key = d2i_ASN1_INTEGER(NULL, &p, priv_len);
if (!priv_key)
return 0;
ret = ((pk_num = ASN1_INTEGER_to_BN(priv_key, NULL)) != NULL);
ASN1_INTEGER_free(priv_key);
if (!ret) {
GOSTerr(GOST_F_PRIV_DECODE_GOST, EVP_R_DECODE_ERROR);
return 0;
}
}
ret = gost_set_priv_key(pk, pk_num);
BN_free(pk_num);
return ret;
}
/* ----------------------------------------------------------------------*/
static int priv_encode_gost(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pk)
{
ASN1_OBJECT *algobj = OBJ_nid2obj(EVP_PKEY_base_id(pk));
ASN1_STRING *params = encode_gost_algor_params(pk);
unsigned char *priv_buf = NULL;
int priv_len;
ASN1_INTEGER *asn1key = NULL;
if (!params) {
return 0;
}
asn1key = BN_to_ASN1_INTEGER(gost_get0_priv_key(pk), NULL);
priv_len = i2d_ASN1_INTEGER(asn1key, &priv_buf);
ASN1_INTEGER_free(asn1key);
return PKCS8_pkey_set0(p8, algobj, 0, V_ASN1_SEQUENCE, params,
priv_buf, priv_len);
}
/* --------- printing keys --------------------------------*/
static int print_gost_94(BIO *out, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *pctx, int type)
{
int param_nid = NID_undef;
if (type == 2) {
BIGNUM *key;
if (!BIO_indent(out, indent, 128))
return 0;
BIO_printf(out, "Private key: ");
key = gost_get0_priv_key(pkey);
if (!key)
BIO_printf(out, "<undefined>");
else
BN_print(out, key);
BIO_printf(out, "\n");
}
if (type >= 1) {
BIGNUM *pubkey;
pubkey = ((DSA *)EVP_PKEY_get0((EVP_PKEY *)pkey))->pub_key;
BIO_indent(out, indent, 128);
BIO_printf(out, "Public key: ");
BN_print(out, pubkey);
BIO_printf(out, "\n");
}
param_nid = gost94_nid_by_params(EVP_PKEY_get0((EVP_PKEY *)pkey));
BIO_indent(out, indent, 128);
BIO_printf(out, "Parameter set: %s\n", OBJ_nid2ln(param_nid));
return 1;
}
static int param_print_gost94(BIO *out, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *pctx)
{
return print_gost_94(out, pkey, indent, pctx, 0);
}
static int pub_print_gost94(BIO *out, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *pctx)
{
return print_gost_94(out, pkey, indent, pctx, 1);
}
static int priv_print_gost94(BIO *out, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *pctx)
{
return print_gost_94(out, pkey, indent, pctx, 2);
}
static int print_gost_01(BIO *out, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *pctx, int type)
{
int param_nid = NID_undef;
if (type == 2) {
BIGNUM *key;
if (!BIO_indent(out, indent, 128))
return 0;
BIO_printf(out, "Private key: ");
key = gost_get0_priv_key(pkey);
if (!key)
BIO_printf(out, "<undefined)");
else
BN_print(out, key);
BIO_printf(out, "\n");
}
if (type >= 1) {
BN_CTX *ctx = BN_CTX_new();
BIGNUM *X, *Y;
const EC_POINT *pubkey;
const EC_GROUP *group;
if (!ctx) {
GOSTerr(GOST_F_PRINT_GOST_01, ERR_R_MALLOC_FAILURE);
return 0;
}
BN_CTX_start(ctx);
X = BN_CTX_get(ctx);
Y = BN_CTX_get(ctx);
pubkey =
EC_KEY_get0_public_key((EC_KEY *)EVP_PKEY_get0((EVP_PKEY *)pkey));
group = EC_KEY_get0_group((EC_KEY *)EVP_PKEY_get0((EVP_PKEY *)pkey));
if (!EC_POINT_get_affine_coordinates_GFp(group, pubkey, X, Y, ctx)) {
GOSTerr(GOST_F_PRINT_GOST_01, ERR_R_EC_LIB);
BN_CTX_free(ctx);
return 0;
}
if (!BIO_indent(out, indent, 128))
return 0;
BIO_printf(out, "Public key:\n");
if (!BIO_indent(out, indent + 3, 128))
return 0;
BIO_printf(out, "X:");
BN_print(out, X);
BIO_printf(out, "\n");
BIO_indent(out, indent + 3, 128);
BIO_printf(out, "Y:");
BN_print(out, Y);
BIO_printf(out, "\n");
BN_CTX_end(ctx);
BN_CTX_free(ctx);
}
param_nid =
EC_GROUP_get_curve_name(EC_KEY_get0_group
(EVP_PKEY_get0((EVP_PKEY *)pkey)));
if (!BIO_indent(out, indent, 128))
return 0;
BIO_printf(out, "Parameter set: %s\n", OBJ_nid2ln(param_nid));
return 1;
}
static int param_print_gost01(BIO *out, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *pctx)
{
return print_gost_01(out, pkey, indent, pctx, 0);
}
static int pub_print_gost01(BIO *out, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *pctx)
{
return print_gost_01(out, pkey, indent, pctx, 1);
}
static int priv_print_gost01(BIO *out, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *pctx)
{
return print_gost_01(out, pkey, indent, pctx, 2);
}
/* ---------------------------------------------------------------------*/
static int param_missing_gost94(const EVP_PKEY *pk)
{
const DSA *dsa = EVP_PKEY_get0((EVP_PKEY *)pk);
if (!dsa)
return 1;
if (!dsa->q)
return 1;
return 0;
}
static int param_missing_gost01(const EVP_PKEY *pk)
{
const EC_KEY *ec = EVP_PKEY_get0((EVP_PKEY *)pk);
if (!ec)
return 1;
if (!EC_KEY_get0_group(ec))
return 1;
return 0;
}
static int param_copy_gost94(EVP_PKEY *to, const EVP_PKEY *from)
{
const DSA *dfrom = EVP_PKEY_get0((EVP_PKEY *)from);
DSA *dto = EVP_PKEY_get0(to);
if (EVP_PKEY_base_id(from) != EVP_PKEY_base_id(to)) {
GOSTerr(GOST_F_PARAM_COPY_GOST94, GOST_R_INCOMPATIBLE_ALGORITHMS);
return 0;
}
if (!dfrom) {
GOSTerr(GOST_F_PARAM_COPY_GOST94, GOST_R_KEY_PARAMETERS_MISSING);
return 0;
}
if (!dto) {
dto = DSA_new();
EVP_PKEY_assign(to, EVP_PKEY_base_id(from), dto);
}
#define COPYBIGNUM(a,b,x) if (a->x) BN_free(a->x); a->x=BN_dup(b->x);
COPYBIGNUM(dto, dfrom, p)
COPYBIGNUM(dto, dfrom, q)
COPYBIGNUM(dto, dfrom, g)
if (dto->priv_key)
gost94_compute_public(dto);
return 1;
}
static int param_copy_gost01(EVP_PKEY *to, const EVP_PKEY *from)
{
EC_KEY *eto = EVP_PKEY_get0(to);
const EC_KEY *efrom = EVP_PKEY_get0((EVP_PKEY *)from);
if (EVP_PKEY_base_id(from) != EVP_PKEY_base_id(to)) {
GOSTerr(GOST_F_PARAM_COPY_GOST01, GOST_R_INCOMPATIBLE_ALGORITHMS);
return 0;
}
if (!efrom) {
GOSTerr(GOST_F_PARAM_COPY_GOST01, GOST_R_KEY_PARAMETERS_MISSING);
return 0;
}
if (!eto) {
eto = EC_KEY_new();
EVP_PKEY_assign(to, EVP_PKEY_base_id(from), eto);
}
EC_KEY_set_group(eto, EC_KEY_get0_group(efrom));
if (EC_KEY_get0_private_key(eto)) {
gost2001_compute_public(eto);
}
return 1;
}
static int param_cmp_gost94(const EVP_PKEY *a, const EVP_PKEY *b)
{
const DSA *da = EVP_PKEY_get0((EVP_PKEY *)a);
const DSA *db = EVP_PKEY_get0((EVP_PKEY *)b);
if (!BN_cmp(da->q, db->q))
return 1;
return 0;
}
static int param_cmp_gost01(const EVP_PKEY *a, const EVP_PKEY *b)
{
if (EC_GROUP_get_curve_name
(EC_KEY_get0_group(EVP_PKEY_get0((EVP_PKEY *)a))) ==
EC_GROUP_get_curve_name(EC_KEY_get0_group
(EVP_PKEY_get0((EVP_PKEY *)b)))) {
return 1;
}
return 0;
}
/* ---------- Public key functions * --------------------------------------*/
static int pub_decode_gost94(EVP_PKEY *pk, X509_PUBKEY *pub)
{
X509_ALGOR *palg = NULL;
const unsigned char *pubkey_buf = NULL;
unsigned char *databuf;
ASN1_OBJECT *palgobj = NULL;
int pub_len, i, j;
DSA *dsa;
ASN1_OCTET_STRING *octet = NULL;
if (!X509_PUBKEY_get0_param(&palgobj, &pubkey_buf, &pub_len, &palg, pub))
return 0;
EVP_PKEY_assign(pk, OBJ_obj2nid(palgobj), NULL);
if (!decode_gost_algor_params(pk, palg))
return 0;
octet = d2i_ASN1_OCTET_STRING(NULL, &pubkey_buf, pub_len);
if (!octet) {
GOSTerr(GOST_F_PUB_DECODE_GOST94, ERR_R_MALLOC_FAILURE);
return 0;
}
databuf = OPENSSL_malloc(octet->length);
if (databuf == NULL) {
GOSTerr(GOST_F_PUB_DECODE_GOST94, ERR_R_MALLOC_FAILURE);
ASN1_OCTET_STRING_free(octet);
return 0;
}
for (i = 0, j = octet->length - 1; i < octet->length; i++, j--) {
databuf[j] = octet->data[i];
}
dsa = EVP_PKEY_get0(pk);
dsa->pub_key = BN_bin2bn(databuf, octet->length, NULL);
ASN1_OCTET_STRING_free(octet);
OPENSSL_free(databuf);
return 1;
}
static int pub_encode_gost94(X509_PUBKEY *pub, const EVP_PKEY *pk)
{
ASN1_OBJECT *algobj = NULL;
ASN1_OCTET_STRING *octet = NULL;
void *pval = NULL;
unsigned char *buf = NULL, *databuf, *sptr;
int i, j, data_len, ret = 0;
int ptype = V_ASN1_UNDEF;
DSA *dsa = EVP_PKEY_get0((EVP_PKEY *)pk);
algobj = OBJ_nid2obj(EVP_PKEY_base_id(pk));
if (pk->save_parameters) {
ASN1_STRING *params = encode_gost_algor_params(pk);
pval = params;
ptype = V_ASN1_SEQUENCE;
}
data_len = BN_num_bytes(dsa->pub_key);
databuf = OPENSSL_malloc(data_len);
if (databuf == NULL) {
GOSTerr(GOST_F_PUB_ENCODE_GOST94, ERR_R_MALLOC_FAILURE);
return 0;
}
BN_bn2bin(dsa->pub_key, databuf);
octet = ASN1_OCTET_STRING_new();
if (octet == NULL) {
GOSTerr(GOST_F_PUB_ENCODE_GOST94, ERR_R_MALLOC_FAILURE);
OPENSSL_free(databuf);
return 0;
}
ASN1_STRING_set(octet, NULL, data_len);
sptr = ASN1_STRING_data(octet);
for (i = 0, j = data_len - 1; i < data_len; i++, j--) {
sptr[i] = databuf[j];
}
OPENSSL_free(databuf);
ret = i2d_ASN1_OCTET_STRING(octet, &buf);
ASN1_BIT_STRING_free(octet);
if (ret < 0)
return 0;
return X509_PUBKEY_set0_param(pub, algobj, ptype, pval, buf, ret);
}
static int pub_decode_gost01(EVP_PKEY *pk, X509_PUBKEY *pub)
{
X509_ALGOR *palg = NULL;
const unsigned char *pubkey_buf = NULL;
unsigned char *databuf;
ASN1_OBJECT *palgobj = NULL;
int pub_len, i, j;
EC_POINT *pub_key;
BIGNUM *X, *Y;
ASN1_OCTET_STRING *octet = NULL;
int len;
const EC_GROUP *group;
if (!X509_PUBKEY_get0_param(&palgobj, &pubkey_buf, &pub_len, &palg, pub))
return 0;
EVP_PKEY_assign(pk, OBJ_obj2nid(palgobj), NULL);
if (!decode_gost_algor_params(pk, palg))
return 0;
group = EC_KEY_get0_group(EVP_PKEY_get0(pk));
octet = d2i_ASN1_OCTET_STRING(NULL, &pubkey_buf, pub_len);
if (!octet) {
GOSTerr(GOST_F_PUB_DECODE_GOST01, ERR_R_MALLOC_FAILURE);
return 0;
}
databuf = OPENSSL_malloc(octet->length);
if (databuf == NULL) {
GOSTerr(GOST_F_PUB_DECODE_GOST01, ERR_R_MALLOC_FAILURE);
ASN1_OCTET_STRING_free(octet);
return 0;
}
for (i = 0, j = octet->length - 1; i < octet->length; i++, j--) {
databuf[j] = octet->data[i];
}
len = octet->length / 2;
ASN1_OCTET_STRING_free(octet);
Y = getbnfrombuf(databuf, len);
X = getbnfrombuf(databuf + len, len);
OPENSSL_free(databuf);
pub_key = EC_POINT_new(group);
if (!EC_POINT_set_affine_coordinates_GFp(group, pub_key, X, Y, NULL)) {
GOSTerr(GOST_F_PUB_DECODE_GOST01, ERR_R_EC_LIB);
EC_POINT_free(pub_key);
BN_free(X);
BN_free(Y);
return 0;
}
BN_free(X);
BN_free(Y);
if (!EC_KEY_set_public_key(EVP_PKEY_get0(pk), pub_key)) {
GOSTerr(GOST_F_PUB_DECODE_GOST01, ERR_R_EC_LIB);
EC_POINT_free(pub_key);
return 0;
}
EC_POINT_free(pub_key);
return 1;
}
static int pub_encode_gost01(X509_PUBKEY *pub, const EVP_PKEY *pk)
{
ASN1_OBJECT *algobj = NULL;
ASN1_OCTET_STRING *octet = NULL;
void *pval = NULL;
unsigned char *buf = NULL, *databuf, *sptr;
int i, j, data_len, ret = 0;
const EC_POINT *pub_key;
BIGNUM *X, *Y, *order;
const EC_KEY *ec = EVP_PKEY_get0((EVP_PKEY *)pk);
int ptype = V_ASN1_UNDEF;
algobj = OBJ_nid2obj(EVP_PKEY_base_id(pk));
if (pk->save_parameters) {
ASN1_STRING *params = encode_gost_algor_params(pk);
pval = params;
ptype = V_ASN1_SEQUENCE;
}
order = BN_new();
EC_GROUP_get_order(EC_KEY_get0_group(ec), order, NULL);
pub_key = EC_KEY_get0_public_key(ec);
if (!pub_key) {
GOSTerr(GOST_F_PUB_ENCODE_GOST01, GOST_R_PUBLIC_KEY_UNDEFINED);
BN_free(order);
return 0;
}
X = BN_new();
Y = BN_new();
EC_POINT_get_affine_coordinates_GFp(EC_KEY_get0_group(ec),
pub_key, X, Y, NULL);
data_len = 2 * BN_num_bytes(order);
BN_free(order);
databuf = OPENSSL_malloc(data_len);
if (databuf == NULL) {
GOSTerr(GOST_F_PUB_ENCODE_GOST01, ERR_R_MALLOC_FAILURE);
BN_free(X);
BN_free(Y);
return 0;
}
memset(databuf, 0, data_len);
store_bignum(X, databuf + data_len / 2, data_len / 2);
store_bignum(Y, databuf, data_len / 2);
BN_free(X);
BN_free(Y);
octet = ASN1_OCTET_STRING_new();
if (octet == NULL) {
GOSTerr(GOST_F_PUB_ENCODE_GOST01, ERR_R_MALLOC_FAILURE);
OPENSSL_free(databuf);
return 0;
}
ASN1_STRING_set(octet, NULL, data_len);
sptr = ASN1_STRING_data(octet);
for (i = 0, j = data_len - 1; i < data_len; i++, j--) {
sptr[i] = databuf[j];
}
OPENSSL_free(databuf);
ret = i2d_ASN1_OCTET_STRING(octet, &buf);
ASN1_BIT_STRING_free(octet);
if (ret < 0)
return 0;
return X509_PUBKEY_set0_param(pub, algobj, ptype, pval, buf, ret);
}
static int pub_cmp_gost94(const EVP_PKEY *a, const EVP_PKEY *b)
{
const DSA *da = EVP_PKEY_get0((EVP_PKEY *)a);
const DSA *db = EVP_PKEY_get0((EVP_PKEY *)b);
if (da && db && da->pub_key && db->pub_key
&& !BN_cmp(da->pub_key, db->pub_key)) {
return 1;
}
return 0;
}
static int pub_cmp_gost01(const EVP_PKEY *a, const EVP_PKEY *b)
{
const EC_KEY *ea = EVP_PKEY_get0((EVP_PKEY *)a);
const EC_KEY *eb = EVP_PKEY_get0((EVP_PKEY *)b);
const EC_POINT *ka, *kb;
int ret = 0;
if (!ea || !eb)
return 0;
ka = EC_KEY_get0_public_key(ea);
kb = EC_KEY_get0_public_key(eb);
if (!ka || !kb)
return 0;
ret = (0 == EC_POINT_cmp(EC_KEY_get0_group(ea), ka, kb, NULL));
return ret;
}
static int pkey_size_gost(const EVP_PKEY *pk)
{
return 64;
}
static int pkey_bits_gost(const EVP_PKEY *pk)
{
return 256;
}
/* ---------------------- ASN1 METHOD for GOST MAC -------------------*/
static void mackey_free_gost(EVP_PKEY *pk)
{
if (pk->pkey.ptr) {
OPENSSL_free(pk->pkey.ptr);
}
}
static int mac_ctrl_gost(EVP_PKEY *pkey, int op, long arg1, void *arg2)
{
switch (op) {
case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
*(int *)arg2 = NID_id_Gost28147_89_MAC;
return 2;
}
return -2;
}
static int gost94_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
{
int nid = gost94_nid_by_params(EVP_PKEY_get0((EVP_PKEY *)pkey));
return i2d_ASN1_OBJECT(OBJ_nid2obj(nid), pder);
}
static int gost2001_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
{
int nid =
EC_GROUP_get_curve_name(EC_KEY_get0_group
(EVP_PKEY_get0((EVP_PKEY *)pkey)));
return i2d_ASN1_OBJECT(OBJ_nid2obj(nid), pder);
}
static int gost94_param_decode(EVP_PKEY *pkey, const unsigned char **pder,
int derlen)
{
ASN1_OBJECT *obj = NULL;
DSA *dsa = EVP_PKEY_get0(pkey);
int nid;
if (d2i_ASN1_OBJECT(&obj, pder, derlen) == NULL) {
return 0;
}
nid = OBJ_obj2nid(obj);
ASN1_OBJECT_free(obj);
if (!dsa) {
dsa = DSA_new();
if (!EVP_PKEY_assign(pkey, NID_id_GostR3410_94, dsa))
return 0;
}
if (!fill_GOST94_params(dsa, nid))
return 0;
return 1;
}
static int gost2001_param_decode(EVP_PKEY *pkey, const unsigned char **pder,
int derlen)
{
ASN1_OBJECT *obj = NULL;
int nid;
EC_KEY *ec = EVP_PKEY_get0(pkey);
if (d2i_ASN1_OBJECT(&obj, pder, derlen) == NULL) {
return 0;
}
nid = OBJ_obj2nid(obj);
ASN1_OBJECT_free(obj);
if (!ec) {
ec = EC_KEY_new();
if (!EVP_PKEY_assign(pkey, NID_id_GostR3410_2001, ec))
return 0;
}
if (!fill_GOST2001_params(ec, nid))
return 0;
return 1;
}
/* ----------------------------------------------------------------------*/
int register_ameth_gost(int nid, EVP_PKEY_ASN1_METHOD **ameth,
const char *pemstr, const char *info)
{
*ameth = EVP_PKEY_asn1_new(nid, ASN1_PKEY_SIGPARAM_NULL, pemstr, info);
if (!*ameth)
return 0;
switch (nid) {
case NID_id_GostR3410_94:
EVP_PKEY_asn1_set_free(*ameth, pkey_free_gost94);
EVP_PKEY_asn1_set_private(*ameth,
priv_decode_gost, priv_encode_gost,
priv_print_gost94);
EVP_PKEY_asn1_set_param(*ameth,
gost94_param_decode, gost94_param_encode,
param_missing_gost94, param_copy_gost94,
param_cmp_gost94, param_print_gost94);
EVP_PKEY_asn1_set_public(*ameth,
pub_decode_gost94, pub_encode_gost94,
pub_cmp_gost94, pub_print_gost94,
pkey_size_gost, pkey_bits_gost);
EVP_PKEY_asn1_set_ctrl(*ameth, pkey_ctrl_gost);
break;
case NID_id_GostR3410_2001:
EVP_PKEY_asn1_set_free(*ameth, pkey_free_gost01);
EVP_PKEY_asn1_set_private(*ameth,
priv_decode_gost, priv_encode_gost,
priv_print_gost01);
EVP_PKEY_asn1_set_param(*ameth,
gost2001_param_decode, gost2001_param_encode,
param_missing_gost01, param_copy_gost01,
param_cmp_gost01, param_print_gost01);
EVP_PKEY_asn1_set_public(*ameth,
pub_decode_gost01, pub_encode_gost01,
pub_cmp_gost01, pub_print_gost01,
pkey_size_gost, pkey_bits_gost);
EVP_PKEY_asn1_set_ctrl(*ameth, pkey_ctrl_gost);
break;
case NID_id_Gost28147_89_MAC:
EVP_PKEY_asn1_set_free(*ameth, mackey_free_gost);
EVP_PKEY_asn1_set_ctrl(*ameth, mac_ctrl_gost);
break;
}
return 1;
}
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