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gost_ameth.c
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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_lcl.h"
#include "e_gost_err.h"
#define PK_WRAP_PARAM "LEGACY_PK_WRAP"
/*
* Pack bignum into byte buffer of given size, filling all leading bytes by
* zeros
*/
int store_bignum(const BIGNUM *bn, unsigned char *buf, int len)
{
int bytes = BN_num_bytes(bn);
if (bytes > len)
return 0;
memset(buf, 0, len);
BN_bn2bin(bn, buf + len - bytes);
return 1;
}
static int pkey_bits_gost(const EVP_PKEY *pk)
{
if (!pk)
return -1;
switch (EVP_PKEY_base_id(pk)) {
case NID_id_GostR3410_2001:
case NID_id_GostR3410_2012_256:
return 256;
case NID_id_GostR3410_2012_512:
return 512;
}
return -1;
}
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;
void *key_ptr = EVP_PKEY_get0((EVP_PKEY *)key);
int result = 0;
if (!params || !gkp) {
GOSTerr(GOST_F_ENCODE_GOST_ALGOR_PARAMS, ERR_R_MALLOC_FAILURE);
goto err;
}
switch (EVP_PKEY_base_id(key)) {
case NID_id_GostR3410_2012_256:
pkey_param_nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(key_ptr));
switch (pkey_param_nid) {
case NID_id_GostR3410_2001_TestParamSet:
case NID_id_GostR3410_2001_CryptoPro_A_ParamSet:
case NID_id_GostR3410_2001_CryptoPro_B_ParamSet:
case NID_id_GostR3410_2001_CryptoPro_C_ParamSet:
case NID_id_GostR3410_2001_CryptoPro_XchA_ParamSet:
case NID_id_GostR3410_2001_CryptoPro_XchB_ParamSet:
gkp->hash_params = OBJ_nid2obj(NID_id_GostR3411_2012_256);
}
break;
case NID_id_GostR3410_2012_512:
pkey_param_nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(key_ptr));
switch (pkey_param_nid) {
case NID_id_tc26_gost_3410_2012_512_paramSetTest:
case NID_id_tc26_gost_3410_2012_512_paramSetA:
case NID_id_tc26_gost_3410_2012_512_paramSetB:
gkp->hash_params = OBJ_nid2obj(NID_id_GostR3411_2012_512);
}
break;
case NID_id_GostR3410_2001:
pkey_param_nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(key_ptr));
gkp->hash_params = OBJ_nid2obj(NID_id_GostR3411_94_CryptoProParamSet);
break;
}
if (pkey_param_nid == NID_undef) {
GOSTerr(GOST_F_ENCODE_GOST_ALGOR_PARAMS, GOST_R_INVALID_PARAMSET);
goto err;
}
gkp->key_params = OBJ_nid2obj(pkey_param_nid);
/*
* gkp->cipher_params = OBJ_nid2obj(cipher_param_nid);
*/
params->length = i2d_GOST_KEY_PARAMS(gkp, ¶ms->data);
if (params->length <= 0) {
GOSTerr(GOST_F_ENCODE_GOST_ALGOR_PARAMS, ERR_R_MALLOC_FAILURE);
goto err;
}
params->type = V_ASN1_SEQUENCE;
result = 1;
err:
if (gkp)
GOST_KEY_PARAMS_free(gkp);
if (result == 0) { /* if error */
if (params)
ASN1_STRING_free(params);
return NULL;
}
return params;
}
static int gost_decode_nid_params(EVP_PKEY *pkey, int pkey_nid, int param_nid)
{
void *key_ptr = EVP_PKEY_get0(pkey);
switch (pkey_nid) {
case NID_id_GostR3410_2012_256:
case NID_id_GostR3410_2012_512:
case NID_id_GostR3410_2001:
if (!key_ptr) {
key_ptr = EC_KEY_new();
if (!EVP_PKEY_assign(pkey, pkey_nid, key_ptr)) {
EC_KEY_free(key_ptr);
break;
}
}
return fill_GOST_EC_params(key_ptr, param_nid);
}
return 0;
}
/*
* Parses GOST algorithm parameters from X509_ALGOR and modifies pkey setting
* NID and parameters
*/
static int decode_gost_algor_params(EVP_PKEY *pkey,
const X509_ALGOR *palg)
{
const ASN1_OBJECT *palg_obj = NULL;
int ptype = V_ASN1_UNDEF;
int pkey_nid = NID_undef, param_nid = NID_undef;
ASN1_STRING *pval = NULL;
const unsigned char *p;
GOST_KEY_PARAMS *gkp = NULL;
if (!pkey || !palg)
return 0;
X509_ALGOR_get0(&palg_obj, &ptype, (const void **)&pval, palg);
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);
if (!EVP_PKEY_set_type(pkey, pkey_nid)) {
GOSTerr(GOST_F_DECODE_GOST_ALGOR_PARAMS, ERR_R_INTERNAL_ERROR);
return 0;
}
return gost_decode_nid_params(pkey, pkey_nid, param_nid);
}
static int gost_set_priv_key(EVP_PKEY *pkey, BIGNUM *priv)
{
switch (EVP_PKEY_base_id(pkey)) {
case NID_id_GostR3410_2012_512:
case NID_id_GostR3410_2012_256:
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))
return gost_ec_compute_public(ec);
break;
}
default:
return 0;
}
return 1;
}
BIGNUM *gost_get0_priv_key(const EVP_PKEY *pkey)
{
switch (EVP_PKEY_base_id(pkey)) {
case NID_id_GostR3410_2012_512:
case NID_id_GostR3410_2012_256:
case NID_id_GostR3410_2001:
{
EC_KEY *ec = EVP_PKEY_get0((EVP_PKEY *)pkey);
if (ec)
return (BIGNUM *)EC_KEY_get0_private_key(ec);
break;
}
}
return NULL;
}
/*
* GOST CMS processing functions
*/
/* FIXME reaarange declarations */
static int pub_decode_gost_ec(EVP_PKEY *pk, const X509_PUBKEY *pub);
static int gost_cms_set_kari_shared_info(EVP_PKEY_CTX *pctx, CMS_RecipientInfo *ri)
{
int ret = 0;
X509_ALGOR *alg;
ASN1_OCTET_STRING *ukm;
/* Deal with originator */
X509_ALGOR *pubalg = NULL;
ASN1_BIT_STRING *pubkey = NULL;
EVP_PKEY *peer_key = NULL;
X509_PUBKEY *tmp = NULL;
int nid;
unsigned char shared_key[64];
size_t shared_key_size = 64;
const EVP_CIPHER *cipher = NULL;
if (CMS_RecipientInfo_kari_get0_alg(ri, &alg, &ukm) == 0)
goto err;
if (CMS_RecipientInfo_kari_get0_orig_id(ri, &pubalg, &pubkey, NULL, NULL, NULL) == 0)
goto err;
nid = OBJ_obj2nid(alg->algorithm);
if (alg->parameter->type != V_ASN1_SEQUENCE)
goto err;
switch (nid) {
case NID_kuznyechik_kexp15:
case NID_magma_kexp15:
cipher = EVP_get_cipherbynid(nid);
break;
}
if (cipher == NULL) {
GOSTerr(GOST_F_GOST_CMS_SET_KARI_SHARED_INFO, GOST_R_CIPHER_NOT_FOUND);
goto err;
}
if (EVP_PKEY_CTX_ctrl(pctx, -1, -1, EVP_PKEY_CTRL_SET_IV,
ASN1_STRING_length(ukm), (void *)ASN1_STRING_get0_data(ukm)) <= 0)
goto err;
if (pubkey != NULL && pubalg != NULL) {
const ASN1_OBJECT *paobj = NULL;
int ptype = 0;
const void *param = NULL;
peer_key = EVP_PKEY_new();
tmp = X509_PUBKEY_new();
if ((peer_key == NULL) || (tmp == NULL)) {
GOSTerr(GOST_F_GOST_CMS_SET_KARI_SHARED_INFO, ERR_R_MALLOC_FAILURE);
goto err;
}
X509_ALGOR_get0(&paobj, &ptype, ¶m, pubalg);
if (X509_PUBKEY_set0_param(tmp, (ASN1_OBJECT *)paobj,
ptype, (void *)param,
(unsigned char *)ASN1_STRING_get0_data(pubkey),
ASN1_STRING_length(pubkey) ) == 0) {
GOSTerr(GOST_F_GOST_CMS_SET_KARI_SHARED_INFO, GOST_R_PUBLIC_KEY_UNDEFINED);
goto err;
}
if (pub_decode_gost_ec(peer_key, tmp) <= 0) {
GOSTerr(GOST_F_GOST_CMS_SET_KARI_SHARED_INFO, GOST_R_ERROR_DECODING_PUBLIC_KEY);
goto err;
}
if (EVP_PKEY_derive_set_peer(pctx, peer_key) <= 0) {
GOSTerr(GOST_F_GOST_CMS_SET_KARI_SHARED_INFO, GOST_R_ERROR_SETTING_PEER_KEY);
goto err;
}
}
if (EVP_PKEY_derive(pctx, shared_key, &shared_key_size) <= 0) {
GOSTerr(GOST_F_GOST_CMS_SET_KARI_SHARED_INFO, GOST_R_ERROR_COMPUTING_SHARED_KEY);
goto err;
}
EVP_CIPHER_CTX_set_flags(CMS_RecipientInfo_kari_get0_ctx(ri), EVP_CIPHER_CTX_FLAG_WRAP_ALLOW);
if (EVP_DecryptInit_ex(CMS_RecipientInfo_kari_get0_ctx(ri), cipher, NULL,
shared_key, ukm->data+24) == 0)
goto err;
ret = 1;
err:
EVP_PKEY_free(peer_key);
if (ret == 0) {
X509_PUBKEY_free(tmp);
}
return ret;
}
static int gost_cms_set_ktri_shared_info(EVP_PKEY_CTX *pctx, CMS_RecipientInfo *ri)
{
X509_ALGOR *alg;
struct gost_pmeth_data *gctx = EVP_PKEY_CTX_get_data(pctx);
CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &alg);
switch (OBJ_obj2nid(alg->algorithm)) {
case NID_kuznyechik_kexp15:
gctx->cipher_nid = NID_kuznyechik_ctr;
break;
case NID_magma_kexp15:
gctx->cipher_nid = NID_magma_ctr;
break;
case NID_id_GostR3410_2001:
case NID_id_GostR3410_2001DH:
case NID_id_GostR3410_2012_256:
case NID_id_GostR3410_2012_512:
gctx->cipher_nid = NID_id_Gost28147_89;
break;
default:
GOSTerr(GOST_F_GOST_CMS_SET_KTRI_SHARED_INFO, GOST_R_UNSUPPORTED_RECIPIENT_INFO);
return 0;
}
return 1;
}
static int gost_cms_set_shared_info(EVP_PKEY_CTX *pctx, CMS_RecipientInfo *ri)
{
switch(CMS_RecipientInfo_type(ri)) {
case CMS_RECIPINFO_AGREE:
return gost_cms_set_kari_shared_info(pctx, ri);
break;
case CMS_RECIPINFO_TRANS:
return gost_cms_set_ktri_shared_info(pctx, ri);
break;
}
GOSTerr(GOST_F_GOST_CMS_SET_SHARED_INFO, GOST_R_UNSUPPORTED_RECIPIENT_INFO);
return 0;
}
static ASN1_STRING *gost_encode_cms_params(int ka_nid)
{
ASN1_STRING *ret = NULL;
ASN1_STRING *params = ASN1_STRING_new();
/* It's a hack. We have only one OID here, so we can use
* GOST_KEY_PARAMS which is a sequence of 3 OIDs,
* the 1st one is mandatory and the rest are optional */
GOST_KEY_PARAMS *gkp = GOST_KEY_PARAMS_new();
if (params == NULL || gkp == NULL) {
GOSTerr(GOST_F_GOST_ENCODE_CMS_PARAMS, ERR_R_MALLOC_FAILURE);
goto end;
}
gkp->key_params = OBJ_nid2obj(ka_nid);
params->length = i2d_GOST_KEY_PARAMS(gkp, ¶ms->data);
if (params->length < 0) {
GOSTerr(GOST_F_GOST_ENCODE_CMS_PARAMS, ERR_R_MALLOC_FAILURE);
goto end;
}
params->type = V_ASN1_SEQUENCE;
ret = params;
end:
GOST_KEY_PARAMS_free(gkp);
if (ret == NULL)
ASN1_STRING_free(params);
return ret;
}
/*
* Control function
*/
static int pkey_ctrl_gost(EVP_PKEY *pkey, int op, long arg1, void *arg2)
{
int nid = EVP_PKEY_base_id(pkey), md_nid = NID_undef;
X509_ALGOR *alg1 = NULL, *alg2 = NULL;
switch (nid) {
case NID_id_GostR3410_2012_512:
md_nid = NID_id_GostR3411_2012_512;
break;
case NID_id_GostR3410_2012_256:
md_nid = NID_id_GostR3411_2012_256;
break;
case NID_id_GostR3410_2001:
case NID_id_GostR3410_94:
md_nid = NID_id_GostR3411_94;
break;
default:
return -1;
}
switch (op) {
case ASN1_PKEY_CTRL_PKCS7_SIGN:
if (arg1 == 0) {
PKCS7_SIGNER_INFO_get0_algs((PKCS7_SIGNER_INFO *)arg2, NULL,
&alg1, &alg2);
X509_ALGOR_set0(alg1, OBJ_nid2obj(md_nid), V_ASN1_NULL, 0);
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) {
CMS_SignerInfo_get0_algs((CMS_SignerInfo *)arg2, NULL, NULL,
&alg1, &alg2);
X509_ALGOR_set0(alg1, OBJ_nid2obj(md_nid), V_ASN1_NULL, 0);
X509_ALGOR_set0(alg2, OBJ_nid2obj(nid), V_ASN1_NULL, 0);
}
return 1;
#endif
case ASN1_PKEY_CTRL_PKCS7_ENCRYPT:
if (arg1 == 0) { /* Encryption */
ASN1_STRING *params = encode_gost_algor_params(pkey);
if (!params) {
return -1;
}
PKCS7_RECIP_INFO_get0_alg((PKCS7_RECIP_INFO *)arg2, &alg1);
X509_ALGOR_set0(alg1, OBJ_nid2obj(EVP_PKEY_id(pkey)),
V_ASN1_SEQUENCE, params);
}
return 1;
#ifndef OPENSSL_NO_CMS
case ASN1_PKEY_CTRL_CMS_ENVELOPE:
if (arg1 == 0) {
EVP_PKEY_CTX *pctx;
CMS_RecipientInfo *ri = arg2;
struct gost_pmeth_data *gctx = NULL;
ASN1_STRING *params = NULL;
pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
if (!pctx)
return 0;
gctx = EVP_PKEY_CTX_get_data(pctx);
switch (gctx->cipher_nid) {
case NID_magma_ctr:
case NID_kuznyechik_ctr:
{
int ka_nid;
nid = (gctx->cipher_nid == NID_magma_ctr) ? NID_magma_kexp15 :
NID_kuznyechik_kexp15;
ka_nid = (EVP_PKEY_base_id(pkey) == NID_id_GostR3410_2012_256) ?
NID_id_tc26_agreement_gost_3410_2012_256 : NID_id_tc26_agreement_gost_3410_2012_512;
params = gost_encode_cms_params(ka_nid);
}
break;
default:
params = encode_gost_algor_params(pkey);
break;
}
if (params == NULL)
return -1;
CMS_RecipientInfo_ktri_get0_algs((CMS_RecipientInfo *)arg2, NULL,
NULL, &alg1);
X509_ALGOR_set0(alg1, OBJ_nid2obj(nid), V_ASN1_SEQUENCE, params);
} else {
EVP_PKEY_CTX *pctx;
CMS_RecipientInfo *ri = arg2;
pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
if (!pctx)
return 0;
return gost_cms_set_shared_info(pctx, ri);
}
return 1;
#ifdef ASN1_PKEY_CTRL_CMS_RI_TYPE
case ASN1_PKEY_CTRL_CMS_RI_TYPE:
*(int *)arg2 = CMS_RECIPINFO_TRANS;
return 1;
case ASN1_PKEY_CTRL_CMS_IS_RI_TYPE_SUPPORTED:
if (arg1 == CMS_RECIPINFO_AGREE || arg1 == CMS_RECIPINFO_TRANS) {
*(int *)arg2 = 1;
return 1;
}
else
return 0;
break;
#endif
#endif
case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
*(int *)arg2 = md_nid;
return 2;
}
return -2;
}
/* --------------------- free functions * ------------------------------*/
static void pkey_free_gost_ec(EVP_PKEY *key)
{
EC_KEY_free((EC_KEY *)EVP_PKEY_get0(key));
}
/* ------------------ private key functions -----------------------------*/
static BIGNUM *unmask_priv_key(EVP_PKEY *pk,
const unsigned char *buf, int len, int num_masks)
{
BIGNUM *pknum_masked = NULL, *q = NULL;
const EC_KEY *key_ptr = (pk) ? EVP_PKEY_get0(pk) : NULL;
const EC_GROUP *group = (key_ptr) ? EC_KEY_get0_group(key_ptr) : NULL;
pknum_masked = BN_lebin2bn(buf, len, BN_secure_new());
if (!pknum_masked)
return NULL;
if (num_masks > 0) {
/*
* XXX Remove sign by gost94
*/
const unsigned char *p = buf + num_masks * len;
q = BN_new();
if (!q || !group || EC_GROUP_get_order(group, q, NULL) <= 0) {
BN_free(pknum_masked);
pknum_masked = NULL;
goto end;
}
for (; p != buf; p -= len) {
BIGNUM *mask = BN_lebin2bn(p, len, BN_secure_new());
BN_CTX *ctx = BN_CTX_secure_new();
BN_mod_mul(pknum_masked, pknum_masked, mask, q, ctx);
BN_CTX_free(ctx);
BN_free(mask);
}
}
end:
if (q)
BN_free(q);
return pknum_masked;
}
static int priv_decode_gost(EVP_PKEY *pk,
const PKCS8_PRIV_KEY_INFO *p8inf)
{
const unsigned char *pkey_buf = NULL, *p = NULL;
int priv_len = 0;
BIGNUM *pk_num = NULL;
int ret = 0;
const X509_ALGOR *palg = NULL;
const ASN1_OBJECT *palg_obj = NULL;
ASN1_INTEGER *priv_key = NULL;
int expected_key_len;
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;
}
expected_key_len = pkey_bits_gost(pk) > 0 ? pkey_bits_gost(pk) / 8 : 0;
if (expected_key_len == 0) {
GOSTerr(GOST_F_PRIV_DECODE_GOST, EVP_R_DECODE_ERROR);
return 0;
}
if (priv_len % expected_key_len == 0) {
/* Key is not wrapped but masked */
pk_num = unmask_priv_key(pk, pkey_buf, expected_key_len,
priv_len / expected_key_len - 1);
} else if (V_ASN1_OCTET_STRING == *p) {
/* New format - Little endian octet string */
ASN1_OCTET_STRING *s = d2i_ASN1_OCTET_STRING(NULL, &p, priv_len);
if (!s || ((s->length != 32) && (s->length != 64))) {
ASN1_STRING_free(s);
GOSTerr(GOST_F_PRIV_DECODE_GOST, EVP_R_DECODE_ERROR);
return 0;
}
pk_num = BN_lebin2bn(s->data, s->length, BN_secure_new());
ASN1_STRING_free(s);
} else if (V_ASN1_INTEGER == *p) {
priv_key = d2i_ASN1_INTEGER(NULL, &p, priv_len);
if (!priv_key) {
GOSTerr(GOST_F_PRIV_DECODE_GOST, EVP_R_DECODE_ERROR);
return 0;
}
pk_num = ASN1_INTEGER_to_BN(priv_key, BN_secure_new());
ASN1_INTEGER_free(priv_key);
} else if ((V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED) == *p) {
MASKED_GOST_KEY *mgk = d2i_MASKED_GOST_KEY(NULL, &p, priv_len);
if (!mgk) {
GOSTerr(GOST_F_PRIV_DECODE_GOST, EVP_R_DECODE_ERROR);
return 0;
}
priv_len = mgk->masked_priv_key->length;
if (priv_len % expected_key_len) {
MASKED_GOST_KEY_free(mgk);
GOSTerr(GOST_F_PRIV_DECODE_GOST, EVP_R_DECODE_ERROR);
return 0;
}
pk_num = unmask_priv_key(pk, mgk->masked_priv_key->data,
expected_key_len,
priv_len / expected_key_len - 1);
MASKED_GOST_KEY_free(mgk);
} else {
GOSTerr(GOST_F_PRIV_DECODE_GOST, EVP_R_DECODE_ERROR);
return 0;
}
if (pk_num == NULL) {
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 = NULL;
unsigned char *buf = NULL;
int key_len = pkey_bits_gost(pk), i = 0;
/* unmasked private key */
const char *pk_format = get_gost_engine_param(GOST_PARAM_PK_FORMAT);
key_len = (key_len < 0) ? 0 : key_len / 8;
if (key_len == 0 || !(buf = OPENSSL_secure_malloc(key_len))) {
return 0;
}
if (!store_bignum(gost_get0_priv_key(pk), buf, key_len)) {
OPENSSL_secure_free(buf);
return 0;
}
params = encode_gost_algor_params(pk);
if (!params) {
OPENSSL_secure_free(buf);
return 0;
}
/* Convert buf to Little-endian */
for (i = 0; i < key_len / 2; i++) {
unsigned char tmp = buf[i];
buf[i] = buf[key_len - 1 - i];
buf[key_len - 1 - i] = tmp;
}
if (pk_format != NULL && strcmp(pk_format, PK_WRAP_PARAM) == 0) {
ASN1_STRING *octet = ASN1_STRING_new();
int priv_len = 0;
unsigned char *priv_buf = NULL;
if (!octet || !ASN1_OCTET_STRING_set(octet, buf, key_len)) {
ASN1_STRING_free(octet);
ASN1_STRING_free(params);
OPENSSL_secure_free(buf);
return 0;
}
priv_len = i2d_ASN1_OCTET_STRING(octet, &priv_buf);
ASN1_STRING_free(octet);
OPENSSL_secure_free(buf);
return PKCS8_pkey_set0(p8, algobj, 0, V_ASN1_SEQUENCE, params,
priv_buf, priv_len);
}
return PKCS8_pkey_set0(p8, algobj, 0, V_ASN1_SEQUENCE, params,
buf, key_len);
}
/* --------- printing keys --------------------------------*/
static int print_gost_priv(BIO *out, const EVP_PKEY *pkey, int indent)
{
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");
return 1;
}
static int print_gost_ec_pub(BIO *out, const EVP_PKEY *pkey, int indent)
{
BN_CTX *ctx;
BIGNUM *X, *Y;
const EC_POINT *pubkey;
const EC_GROUP *group;
EC_KEY *key = (EC_KEY *)EVP_PKEY_get0((EVP_PKEY *)pkey);
int ok = 0;
ctx = BN_CTX_new();
if (!ctx) {
GOSTerr(GOST_F_PRINT_GOST_EC_PUB, ERR_R_MALLOC_FAILURE);
return 0;
}
BN_CTX_start(ctx);
X = BN_CTX_get(ctx);
Y = BN_CTX_get(ctx);
pubkey = (key) ? EC_KEY_get0_public_key(key) : NULL;
group = (key) ? EC_KEY_get0_group(key) : NULL;
if (!pubkey || !group)
goto err;
if (!EC_POINT_get_affine_coordinates(group, pubkey, X, Y, ctx)) {
GOSTerr(GOST_F_PRINT_GOST_EC_PUB, ERR_R_EC_LIB);
goto err;
}
if (!BIO_indent(out, indent, 128))
goto err;
BIO_printf(out, "Public key:\n");
if (!BIO_indent(out, indent + 3, 128))
goto err;
BIO_printf(out, "X:");
BN_print(out, X);
BIO_printf(out, "\n");
if (!BIO_indent(out, indent + 3, 128))
goto err;
BIO_printf(out, "Y:");
BN_print(out, Y);
BIO_printf(out, "\n");
ok = 1;
err:
BN_CTX_end(ctx);
BN_CTX_free(ctx);
return ok;
}
static int print_gost_ec_param(BIO *out, const EVP_PKEY *pkey, int indent)
{
EC_KEY *ec = EVP_PKEY_get0((EVP_PKEY *)pkey);
const EC_GROUP *group = (ec) ? EC_KEY_get0_group(ec) : NULL;
int param_nid;
if (!group)
return 0;
param_nid = EC_GROUP_get_curve_name(group);
if (!BIO_indent(out, indent, 128))
return 0;
BIO_printf(out, "Parameter set: %s\n", OBJ_nid2ln(param_nid));
return 1;
}
static int print_gost_ec(BIO *out, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *pctx, int type)
{
if (type == 2) {
if (print_gost_priv(out, pkey, indent) == 0)
return 0;
}
if (type >= 1) {
if (print_gost_ec_pub(out, pkey, indent) == 0)
return 0;
}
return print_gost_ec_param(out, pkey, indent);
}
static int param_print_gost_ec(BIO *out, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *pctx)
{
return print_gost_ec(out, pkey, indent, pctx, 0);
}
static int pub_print_gost_ec(BIO *out, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *pctx)
{
return print_gost_ec(out, pkey, indent, pctx, 1);
}
static int priv_print_gost_ec(BIO *out, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *pctx)
{
return print_gost_ec(out, pkey, indent, pctx, 2);
}
/* ---------------------------------------------------------------------*/
static int param_missing_gost_ec(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_gost_ec(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_GOST_EC, GOST_R_INCOMPATIBLE_ALGORITHMS);
return 0;
}
if (!efrom) {
GOSTerr(GOST_F_PARAM_COPY_GOST_EC, GOST_R_KEY_PARAMETERS_MISSING);
return 0;
}
if (!eto) {
eto = EC_KEY_new();
if (!eto) {
GOSTerr(GOST_F_PARAM_COPY_GOST_EC, ERR_R_MALLOC_FAILURE);
return 0;
}
if (!EVP_PKEY_assign(to, EVP_PKEY_base_id(from), eto)) {
GOSTerr(GOST_F_PARAM_COPY_GOST_EC, ERR_R_INTERNAL_ERROR);
EC_KEY_free(eto);
return 0;
}
}
if (!EC_KEY_set_group(eto, EC_KEY_get0_group(efrom))) {
GOSTerr(GOST_F_PARAM_COPY_GOST_EC, ERR_R_INTERNAL_ERROR);
return 0;
}
if (EC_KEY_get0_private_key(eto)) {
return gost_ec_compute_public(eto);
}
return 1;
}
static int param_cmp_gost_ec(const EVP_PKEY *a, const EVP_PKEY *b)
{
const EC_GROUP *group_a, *group_b;
EC_KEY *ec_a = EVP_PKEY_get0((EVP_PKEY *)a);
EC_KEY *ec_b = EVP_PKEY_get0((EVP_PKEY *)b);
if (!ec_a || !ec_b)
return 0;
group_a = EC_KEY_get0_group(ec_a);
group_b = EC_KEY_get0_group(ec_b);
if (!group_a || !group_b)
return 0;
if (EC_GROUP_get_curve_name(group_a) == EC_GROUP_get_curve_name(group_b)) {
return 1;
}
return 0;
}
/* ---------- Public key functions * --------------------------------------*/
static int pub_decode_gost_ec(EVP_PKEY *pk, const X509_PUBKEY *pub)
{
X509_ALGOR *palg = NULL;
const unsigned char *pubkey_buf = NULL;
unsigned char *databuf;
ASN1_OBJECT *palgobj = NULL;
int pub_len;
EC_POINT *pub_key;
BIGNUM *X, *Y;
ASN1_OCTET_STRING *octet = NULL;
size_t 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_GOST_EC, ERR_R_MALLOC_FAILURE);
return 0;
}
databuf = OPENSSL_malloc(octet->length);
if (databuf == NULL) {
GOSTerr(GOST_F_PUB_DECODE_GOST_EC, ERR_R_MALLOC_FAILURE);
ASN1_OCTET_STRING_free(octet);
return 0;
}
BUF_reverse(databuf, octet->data, octet->length);
len = octet->length / 2;
ASN1_OCTET_STRING_free(octet);
Y = BN_bin2bn(databuf, len, NULL);
X = BN_bin2bn(databuf + len, len, NULL);
OPENSSL_free(databuf);
pub_key = EC_POINT_new(group);
if (!EC_POINT_set_affine_coordinates(group, pub_key, X, Y, NULL)) {
GOSTerr(GOST_F_PUB_DECODE_GOST_EC, 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_GOST_EC, ERR_R_EC_LIB);
EC_POINT_free(pub_key);
return 0;
}
EC_POINT_free(pub_key);
return 1;
}
static int pub_encode_gost_ec(X509_PUBKEY *pub, const EVP_PKEY *pk)
{
ASN1_OBJECT *algobj;
ASN1_OCTET_STRING *octet = NULL;
void *pval;
unsigned char *buf = NULL, *databuf = NULL;
int data_len, ret = -1;
const EC_POINT *pub_key;
BIGNUM *X = NULL, *Y = NULL, *order;
const EC_KEY *ec = EVP_PKEY_get0((EVP_PKEY *)pk);
int ptype = V_ASN1_SEQUENCE;
ASN1_STRING *params;
algobj = OBJ_nid2obj(EVP_PKEY_base_id(pk));
params = encode_gost_algor_params(pk);
pval = params;
order = BN_new();
if (order == NULL || EC_GROUP_get_order(EC_KEY_get0_group(ec), order, NULL) == 0) {
GOSTerr(GOST_F_PUB_ENCODE_GOST_EC, ERR_R_MALLOC_FAILURE);
goto err;
}
if (EC_GROUP_get_order(EC_KEY_get0_group(ec), order, NULL) == 0) {
GOSTerr(GOST_F_PUB_ENCODE_GOST_EC, ERR_R_INTERNAL_ERROR);
goto err;
}
pub_key = EC_KEY_get0_public_key(ec);
if (!pub_key) {
GOSTerr(GOST_F_PUB_ENCODE_GOST_EC, GOST_R_PUBLIC_KEY_UNDEFINED);
goto err;
}
X = BN_new();
Y = BN_new();
if (!X || !Y) {
GOSTerr(GOST_F_PUB_ENCODE_GOST_EC, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!EC_POINT_get_affine_coordinates(EC_KEY_get0_group(ec),
pub_key, X, Y, NULL)) {
GOSTerr(GOST_F_PUB_ENCODE_GOST_EC, ERR_R_INTERNAL_ERROR);
goto err;
}
data_len = 2 * BN_num_bytes(order);