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src/lib/libcrypto/gost/gostr341001_pmeth.c

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/* $OpenBSD: gostr341001_pmeth.c,v 1.19 2023/07/28 15:50:33 tb Exp $ */
/*
* Copyright (c) 2014 Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
* Copyright (c) 2005-2006 Cryptocom LTD
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@openssl.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*/
#include <string.h>
#include <openssl/opensslconf.h>
#ifndef OPENSSL_NO_GOST
#include <openssl/bn.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#include <openssl/gost.h>
#include <openssl/ec.h>
#include <openssl/x509.h>
#include "ecdsa_local.h"
#include "evp_local.h"
#include "gost_local.h"
#include "gost_asn1.h"
static ECDSA_SIG *
unpack_signature_cp(const unsigned char *sig, size_t siglen)
{
ECDSA_SIG *s;
s = ECDSA_SIG_new();
if (s == NULL) {
GOSTerror(ERR_R_MALLOC_FAILURE);
return NULL;
}
BN_bin2bn(sig, siglen / 2, s->s);
BN_bin2bn(sig + siglen / 2, siglen / 2, s->r);
return s;
}
static int
pack_signature_cp(ECDSA_SIG *s, int order, unsigned char *sig, size_t *siglen)
{
int r_len = BN_num_bytes(s->r);
int s_len = BN_num_bytes(s->s);
if (r_len > order || s_len > order)
return 0;
*siglen = 2 * order;
memset(sig, 0, *siglen);
BN_bn2bin(s->s, sig + order - s_len);
BN_bn2bin(s->r, sig + 2 * order - r_len);
ECDSA_SIG_free(s);
return 1;
}
static ECDSA_SIG *
unpack_signature_le(const unsigned char *sig, size_t siglen)
{
ECDSA_SIG *s;
s = ECDSA_SIG_new();
if (s == NULL) {
GOSTerror(ERR_R_MALLOC_FAILURE);
return NULL;
}
GOST_le2bn(sig, siglen / 2, s->r);
GOST_le2bn(sig + siglen / 2, siglen / 2, s->s);
return s;
}
static int
pack_signature_le(ECDSA_SIG *s, int order, unsigned char *sig, size_t *siglen)
{
*siglen = 2 * order;
memset(sig, 0, *siglen);
GOST_bn2le(s->r, sig, order);
GOST_bn2le(s->s, sig + order, order);
ECDSA_SIG_free(s);
return 1;
}
struct gost_pmeth_data {
int sign_param_nid; /* Should be set whenever parameters are filled */
int digest_nid;
EVP_MD *md;
unsigned char *shared_ukm;
int peer_key_used;
int sig_format;
};
static int
pkey_gost01_init(EVP_PKEY_CTX *ctx)
{
struct gost_pmeth_data *data;
EVP_PKEY *pkey = EVP_PKEY_CTX_get0_pkey(ctx);
data = calloc(1, sizeof(struct gost_pmeth_data));
if (data == NULL)
return 0;
if (pkey != NULL && pkey->pkey.gost != NULL) {
data->sign_param_nid =
EC_GROUP_get_curve_name(GOST_KEY_get0_group(pkey->pkey.gost));
data->digest_nid = GOST_KEY_get_digest(pkey->pkey.gost);
}
EVP_PKEY_CTX_set_data(ctx, data);
return 1;
}
/* Copies contents of gost_pmeth_data structure */
static int
pkey_gost01_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
{
struct gost_pmeth_data *dst_data, *src_data;
if (pkey_gost01_init(dst) == 0)
return 0;
src_data = EVP_PKEY_CTX_get_data(src);
dst_data = EVP_PKEY_CTX_get_data(dst);
*dst_data = *src_data;
if (src_data->shared_ukm != NULL)
dst_data->shared_ukm = NULL;
return 1;
}
/* Frees up gost_pmeth_data structure */
static void
pkey_gost01_cleanup(EVP_PKEY_CTX *ctx)
{
struct gost_pmeth_data *data;
if ((data = EVP_PKEY_CTX_get_data(ctx)) == NULL)
return;
free(data->shared_ukm);
free(data);
}
static int
pkey_gost01_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
{
struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(ctx);
EC_GROUP *group = NULL;
GOST_KEY *gost = NULL;
int ret = 0;
if (data->sign_param_nid == NID_undef ||
data->digest_nid == NID_undef) {
GOSTerror(GOST_R_NO_PARAMETERS_SET);
return 0;
}
group = EC_GROUP_new_by_curve_name(data->sign_param_nid);
if (group == NULL)
goto done;
EC_GROUP_set_asn1_flag(group, OPENSSL_EC_NAMED_CURVE);
gost = GOST_KEY_new();
if (gost == NULL)
goto done;
if (GOST_KEY_set_digest(gost, data->digest_nid) == 0)
goto done;
if (GOST_KEY_set_group(gost, group) != 0)
ret = EVP_PKEY_assign_GOST(pkey, gost);
done:
if (ret == 0)
GOST_KEY_free(gost);
EC_GROUP_free(group);
return ret;
}
static int
pkey_gost01_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
{
if (pkey_gost01_paramgen(ctx, pkey) == 0)
return 0;
return gost2001_keygen(pkey->pkey.gost) != 0;
}
static int
pkey_gost01_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
const unsigned char *tbs, size_t tbs_len)
{
ECDSA_SIG *unpacked_sig = NULL;
EVP_PKEY *pkey = EVP_PKEY_CTX_get0_pkey(ctx);
struct gost_pmeth_data *pctx = EVP_PKEY_CTX_get_data(ctx);
BIGNUM *md;
size_t size;
int ret;
if (pkey == NULL || pkey->pkey.gost == NULL)
return 0;
size = GOST_KEY_get_size(pkey->pkey.gost);
if (siglen == NULL)
return 0;
if (sig == NULL) {
*siglen = 2 * size;
return 1;
} else if (*siglen < 2 * size) {
GOSTerror(EC_R_BUFFER_TOO_SMALL);
return 0;
}
if (tbs_len != 32 && tbs_len != 64) {
GOSTerror(EVP_R_BAD_BLOCK_LENGTH);
return 0;
}
md = GOST_le2bn(tbs, tbs_len, NULL);
if (md == NULL)
return 0;
unpacked_sig = gost2001_do_sign(md, pkey->pkey.gost);
BN_free(md);
if (unpacked_sig == NULL) {
return 0;
}
switch (pctx->sig_format) {
case GOST_SIG_FORMAT_SR_BE:
ret = pack_signature_cp(unpacked_sig, size, sig, siglen);
break;
case GOST_SIG_FORMAT_RS_LE:
ret = pack_signature_le(unpacked_sig, size, sig, siglen);
break;
default:
ret = -1;
break;
}
if (ret <= 0)
ECDSA_SIG_free(unpacked_sig);
return ret;
}
static int
pkey_gost01_verify(EVP_PKEY_CTX *ctx, const unsigned char *sig, size_t siglen,
const unsigned char *tbs, size_t tbs_len)
{
int ok = 0;
EVP_PKEY *pub_key = EVP_PKEY_CTX_get0_pkey(ctx);
struct gost_pmeth_data *pctx = EVP_PKEY_CTX_get_data(ctx);
ECDSA_SIG *s = NULL;
BIGNUM *md;
if (pub_key == NULL)
return 0;
switch (pctx->sig_format) {
case GOST_SIG_FORMAT_SR_BE:
s = unpack_signature_cp(sig, siglen);
break;
case GOST_SIG_FORMAT_RS_LE:
s = unpack_signature_le(sig, siglen);
break;
}
if (s == NULL)
return 0;
md = GOST_le2bn(tbs, tbs_len, NULL);
if (md == NULL)
goto err;
ok = gost2001_do_verify(md, s, pub_key->pkey.gost);
err:
BN_free(md);
ECDSA_SIG_free(s);
return ok;
}
static int
gost01_VKO_key(EVP_PKEY *pub_key, EVP_PKEY *priv_key, const unsigned char *ukm,
unsigned char *key)
{
unsigned char hashbuf[128];
int digest_nid;
int ret = 0;
BN_CTX *ctx = BN_CTX_new();
BIGNUM *UKM, *X, *Y;
if (ctx == NULL)
return 0;
BN_CTX_start(ctx);
if ((UKM = BN_CTX_get(ctx)) == NULL)
goto err;
if ((X = BN_CTX_get(ctx)) == NULL)
goto err;
if ((Y = BN_CTX_get(ctx)) == NULL)
goto err;
GOST_le2bn(ukm, 8, UKM);
digest_nid = GOST_KEY_get_digest(priv_key->pkey.gost);
if (VKO_compute_key(X, Y, pub_key->pkey.gost, priv_key->pkey.gost,
UKM) == 0)
goto err;
switch (digest_nid) {
case NID_id_GostR3411_94_CryptoProParamSet:
GOST_bn2le(X, hashbuf, 32);
GOST_bn2le(Y, hashbuf + 32, 32);
GOSTR341194(hashbuf, 64, key, digest_nid);
ret = 1;
break;
case NID_id_tc26_gost3411_2012_256:
GOST_bn2le(X, hashbuf, 32);
GOST_bn2le(Y, hashbuf + 32, 32);
STREEBOG256(hashbuf, 64, key);
ret = 1;
break;
case NID_id_tc26_gost3411_2012_512:
GOST_bn2le(X, hashbuf, 64);
GOST_bn2le(Y, hashbuf + 64, 64);
STREEBOG256(hashbuf, 128, key);
ret = 1;
break;
default:
ret = -2;
break;
}
err:
BN_CTX_end(ctx);
BN_CTX_free(ctx);
return ret;
}
int
pkey_gost01_decrypt(EVP_PKEY_CTX *pctx, unsigned char *key, size_t *key_len,
const unsigned char *in, size_t in_len)
{
const unsigned char *p = in;
EVP_PKEY *priv = EVP_PKEY_CTX_get0_pkey(pctx);
GOST_KEY_TRANSPORT *gkt = NULL;
int ret = 0;
unsigned char wrappedKey[44];
unsigned char sharedKey[32];
EVP_PKEY *eph_key = NULL, *peerkey = NULL;
int nid;
if (key == NULL) {
*key_len = 32;
return 1;
}
gkt = d2i_GOST_KEY_TRANSPORT(NULL, (const unsigned char **)&p, in_len);
if (gkt == NULL) {
GOSTerror(GOST_R_ERROR_PARSING_KEY_TRANSPORT_INFO);
return -1;
}
/* If key transport structure contains public key, use it */
eph_key = X509_PUBKEY_get(gkt->key_agreement_info->ephem_key);
if (eph_key != NULL) {
if (EVP_PKEY_derive_set_peer(pctx, eph_key) <= 0) {
GOSTerror(GOST_R_INCOMPATIBLE_PEER_KEY);
goto err;
}
} else {
/* Set control "public key from client certificate used" */
if (EVP_PKEY_CTX_ctrl(pctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 3,
NULL) <= 0) {
GOSTerror(GOST_R_CTRL_CALL_FAILED);
goto err;
}
}
peerkey = EVP_PKEY_CTX_get0_peerkey(pctx);
if (peerkey == NULL) {
GOSTerror(GOST_R_NO_PEER_KEY);
goto err;
}
nid = OBJ_obj2nid(gkt->key_agreement_info->cipher);
if (gkt->key_agreement_info->eph_iv->length != 8) {
GOSTerror(GOST_R_INVALID_IV_LENGTH);
goto err;
}
memcpy(wrappedKey, gkt->key_agreement_info->eph_iv->data, 8);
if (gkt->key_info->encrypted_key->length != 32) {
GOSTerror(EVP_R_BAD_KEY_LENGTH);
goto err;
}
memcpy(wrappedKey + 8, gkt->key_info->encrypted_key->data, 32);
if (gkt->key_info->imit->length != 4) {
GOSTerror(ERR_R_INTERNAL_ERROR);
goto err;
}
memcpy(wrappedKey + 40, gkt->key_info->imit->data, 4);
if (gost01_VKO_key(peerkey, priv, wrappedKey, sharedKey) <= 0)
goto err;
if (gost_key_unwrap_crypto_pro(nid, sharedKey, wrappedKey, key) == 0) {
GOSTerror(GOST_R_ERROR_COMPUTING_SHARED_KEY);
goto err;
}
ret = 1;
err:
EVP_PKEY_free(eph_key);
GOST_KEY_TRANSPORT_free(gkt);
return ret;
}
int
pkey_gost01_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen)
{
/*
* Public key of peer in the ctx field peerkey
* Our private key in the ctx pkey
* ukm is in the algorithm specific context data
*/
EVP_PKEY *my_key = EVP_PKEY_CTX_get0_pkey(ctx);
EVP_PKEY *peer_key = EVP_PKEY_CTX_get0_peerkey(ctx);
struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(ctx);
if (data->shared_ukm == NULL) {
GOSTerror(GOST_R_UKM_NOT_SET);
return 0;
}
if (key == NULL) {
*keylen = 32;
return 32;
}
if (gost01_VKO_key(peer_key, my_key, data->shared_ukm, key) <= 0)
return 0;
*keylen = 32;
return 1;
}
int
pkey_gost01_encrypt(EVP_PKEY_CTX *pctx, unsigned char *out, size_t *out_len,
const unsigned char *key, size_t key_len)
{
GOST_KEY_TRANSPORT *gkt = NULL;
EVP_PKEY *pubk = EVP_PKEY_CTX_get0_pkey(pctx);
struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(pctx);
unsigned char ukm[8], shared_key[32], crypted_key[44];
int ret = 0;
int key_is_ephemeral;
EVP_PKEY *sec_key = EVP_PKEY_CTX_get0_peerkey(pctx);
int nid = NID_id_Gost28147_89_CryptoPro_A_ParamSet;
if (data->shared_ukm != NULL) {
memcpy(ukm, data->shared_ukm, 8);
} else /* if (out != NULL) */ {
arc4random_buf(ukm, 8);
}
/* Check for private key in the peer_key of context */
if (sec_key) {
key_is_ephemeral = 0;
if (GOST_KEY_get0_private_key(sec_key->pkey.gost) == 0) {
GOSTerror(GOST_R_NO_PRIVATE_PART_OF_NON_EPHEMERAL_KEYPAIR);
goto err;
}
} else {
key_is_ephemeral = 1;
if (out != NULL) {
GOST_KEY *tmp_key;
sec_key = EVP_PKEY_new();
if (sec_key == NULL)
goto err;
tmp_key = GOST_KEY_new();
if (tmp_key == NULL)
goto err;
if (EVP_PKEY_assign(sec_key, EVP_PKEY_base_id(pubk),
tmp_key) == 0) {
GOST_KEY_free(tmp_key);
goto err;
}
if (EVP_PKEY_copy_parameters(sec_key, pubk) == 0)
goto err;
if (gost2001_keygen(sec_key->pkey.gost) == 0) {
goto err;
}
}
}
if (out != NULL) {
if (gost01_VKO_key(pubk, sec_key, ukm, shared_key) <= 0)
goto err;
gost_key_wrap_crypto_pro(nid, shared_key, ukm, key,
crypted_key);
}
gkt = GOST_KEY_TRANSPORT_new();
if (gkt == NULL)
goto err;
if (ASN1_OCTET_STRING_set(gkt->key_agreement_info->eph_iv, ukm, 8) == 0)
goto err;
if (ASN1_OCTET_STRING_set(gkt->key_info->imit, crypted_key + 40,
4) == 0)
goto err;
if (ASN1_OCTET_STRING_set(gkt->key_info->encrypted_key, crypted_key + 8,
32) == 0)
goto err;
if (key_is_ephemeral) {
if (X509_PUBKEY_set(&gkt->key_agreement_info->ephem_key,
out != NULL ? sec_key : pubk) == 0) {
GOSTerror(GOST_R_CANNOT_PACK_EPHEMERAL_KEY);
goto err;
}
}
ASN1_OBJECT_free(gkt->key_agreement_info->cipher);
gkt->key_agreement_info->cipher = OBJ_nid2obj(nid);
if (key_is_ephemeral)
EVP_PKEY_free(sec_key);
else {
/* Set control "public key from client certificate used" */
if (EVP_PKEY_CTX_ctrl(pctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 3,
NULL) <= 0) {
GOSTerror(GOST_R_CTRL_CALL_FAILED);
goto err;
}
}
if ((*out_len = i2d_GOST_KEY_TRANSPORT(gkt, out ? &out : NULL)) > 0)
ret = 1;
GOST_KEY_TRANSPORT_free(gkt);
return ret;
err:
if (key_is_ephemeral)
EVP_PKEY_free(sec_key);
GOST_KEY_TRANSPORT_free(gkt);
return -1;
}
static int
pkey_gost01_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
{
struct gost_pmeth_data *pctx = EVP_PKEY_CTX_get_data(ctx);
switch (type) {
case EVP_PKEY_CTRL_MD:
if (EVP_MD_type(p2) !=
GostR3410_get_md_digest(pctx->digest_nid)) {
GOSTerror(GOST_R_INVALID_DIGEST_TYPE);
return 0;
}
pctx->md = p2;
return 1;
case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
case EVP_PKEY_CTRL_PKCS7_DECRYPT:
case EVP_PKEY_CTRL_PKCS7_SIGN:
case EVP_PKEY_CTRL_DIGESTINIT:
return 1;
case EVP_PKEY_CTRL_GOST_PARAMSET:
pctx->sign_param_nid = (int)p1;
return 1;
case EVP_PKEY_CTRL_SET_IV:
{
char *ukm = malloc(p1);
if (ukm == NULL) {
GOSTerror(ERR_R_MALLOC_FAILURE);
return 0;
}
memcpy(ukm, p2, p1);
free(pctx->shared_ukm);
pctx->shared_ukm = ukm;
return 1;
}
case EVP_PKEY_CTRL_PEER_KEY:
if (p1 == 0 || p1 == 1) /* call from EVP_PKEY_derive_set_peer */
return 1;
if (p1 == 2) /* TLS: peer key used? */
return pctx->peer_key_used;
if (p1 == 3) /* TLS: peer key used! */
return (pctx->peer_key_used = 1);
return -2;
case EVP_PKEY_CTRL_GOST_SIG_FORMAT:
switch (p1) {
case GOST_SIG_FORMAT_SR_BE:
case GOST_SIG_FORMAT_RS_LE:
pctx->sig_format = p1;
return 1;
default:
return 0;
}
break;
case EVP_PKEY_CTRL_GOST_SET_DIGEST:
pctx->digest_nid = (int)p1;
return 1;
case EVP_PKEY_CTRL_GOST_GET_DIGEST:
*(int *)p2 = pctx->digest_nid;
return 1;
default:
return -2;
}
}
static int
pkey_gost01_ctrl_str(EVP_PKEY_CTX *ctx, const char *type, const char *value)
{
int param_nid = NID_undef;
int digest_nid = NID_undef;
if (strcmp(type, "paramset") == 0) {
if (value == NULL)
return 0;
if (pkey_gost01_ctrl(ctx, EVP_PKEY_CTRL_GOST_GET_DIGEST, 0,
&digest_nid) == 0)
return 0;
if (digest_nid == NID_id_tc26_gost3411_2012_512)
param_nid = GostR3410_512_param_id(value);
else
param_nid = GostR3410_256_param_id(value);
if (param_nid == NID_undef)
param_nid = OBJ_txt2nid(value);
if (param_nid == NID_undef)
return 0;
return pkey_gost01_ctrl(ctx, EVP_PKEY_CTRL_GOST_PARAMSET,
param_nid, NULL);
}
if (strcmp(type, "dgst") == 0) {
if (value == NULL)
return 0;
else if (strcmp(value, "gost94") == 0 ||
strcmp(value, "md_gost94") == 0)
digest_nid = NID_id_GostR3411_94_CryptoProParamSet;
else if (strcmp(value, "streebog256") == 0)
digest_nid = NID_id_tc26_gost3411_2012_256;
else if (strcmp(value, "streebog512") == 0)
digest_nid = NID_id_tc26_gost3411_2012_512;
if (digest_nid == NID_undef)
return 0;
return pkey_gost01_ctrl(ctx, EVP_PKEY_CTRL_GOST_SET_DIGEST,
digest_nid, NULL);
}
return -2;
}
const EVP_PKEY_METHOD gostr01_pkey_meth = {
.pkey_id = EVP_PKEY_GOSTR01,
.init = pkey_gost01_init,
.copy = pkey_gost01_copy,
.cleanup = pkey_gost01_cleanup,
.paramgen = pkey_gost01_paramgen,
.keygen = pkey_gost01_keygen,
.sign = pkey_gost01_sign,
.verify = pkey_gost01_verify,
.encrypt = pkey_gost01_encrypt,
.decrypt = pkey_gost01_decrypt,
.derive = pkey_gost01_derive,
.ctrl = pkey_gost01_ctrl,
.ctrl_str = pkey_gost01_ctrl_str,
};
#endif
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