789 lines
25 KiB
C
789 lines
25 KiB
C
/**********************************************************************
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* gost_ec_keyx.c *
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* *
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* Copyright (c) 2005-2013 Cryptocom LTD *
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* Copyright (c) 2018,2020 Dmitry Belyavskiy <beldmit@gmail.com> *
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* Copyright (c) 2020 Billy Brumley <bbrumley@gmail.com> *
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* *
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* This file is distributed under the same license as OpenSSL *
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* *
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* VK0 R 50.1.113-2016 / RFC 7836 *
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* KEG R 1323565.1.020-2018 *
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* VK0 34.10-2001 key exchange and GOST R 34.10-2001 (RFC 4357) *
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* based PKCS7/SMIME support *
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* Requires OpenSSL 0.9.9 for compilation *
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**********************************************************************/
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#include <openssl/evp.h>
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#include <openssl/err.h>
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#include <openssl/rand.h>
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#include <string.h>
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#include <openssl/objects.h>
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#include "gost89.h"
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#include "e_gost_err.h"
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#include "gost_keywrap.h"
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#include "gost_lcl.h"
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/* Implementation of CryptoPro VKO 34.10-2001/2012 algorithm */
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int VKO_compute_key(unsigned char *shared_key,
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const EC_POINT *pub_key, const EC_KEY *priv_key,
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const unsigned char *ukm, const size_t ukm_size,
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const int vko_dgst_nid)
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{
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unsigned char *databuf = NULL;
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BIGNUM *scalar = NULL, *X = NULL, *Y = NULL;
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const EC_GROUP *grp = NULL;
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EC_POINT *pnt = NULL;
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BN_CTX *ctx = NULL;
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EVP_MD_CTX *mdctx = NULL;
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const EVP_MD *md = NULL;
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int buf_len, half_len;
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int ret = 0;
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if ((ctx = BN_CTX_secure_new()) == NULL) {
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GOSTerr(GOST_F_VKO_COMPUTE_KEY, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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BN_CTX_start(ctx);
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md = EVP_get_digestbynid(vko_dgst_nid);
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if (!md) {
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GOSTerr(GOST_F_VKO_COMPUTE_KEY, GOST_R_INVALID_DIGEST_TYPE);
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goto err;
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}
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grp = EC_KEY_get0_group(priv_key);
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scalar = BN_CTX_get(ctx);
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X = BN_CTX_get(ctx);
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if ((Y = BN_CTX_get(ctx)) == NULL
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|| (pnt = EC_POINT_new(grp)) == NULL
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|| BN_lebin2bn(ukm, ukm_size, scalar) == NULL
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|| !BN_mod_mul(scalar, scalar, EC_KEY_get0_private_key(priv_key),
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EC_GROUP_get0_order(grp), ctx))
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goto err;
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#if 0
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/*-
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* These two curves have cofactor 4; the rest have cofactor 1.
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* But currently gost_ec_point_mul takes care of the cofactor clearing,
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* hence this code is not needed.
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*/
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switch (EC_GROUP_get_curve_name(grp)) {
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case NID_id_tc26_gost_3410_2012_256_paramSetA:
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case NID_id_tc26_gost_3410_2012_512_paramSetC:
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if (!BN_lshift(scalar, scalar, 2))
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goto err;
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break;
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}
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#endif
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if (!gost_ec_point_mul(grp, pnt, NULL, pub_key, scalar, ctx)) {
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GOSTerr(GOST_F_VKO_COMPUTE_KEY, GOST_R_ERROR_POINT_MUL);
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goto err;
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}
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if (!EC_POINT_get_affine_coordinates(grp, pnt, X, Y, ctx)) {
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GOSTerr(GOST_F_VKO_COMPUTE_KEY, ERR_R_EC_LIB);
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goto err;
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}
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half_len = BN_num_bytes(EC_GROUP_get0_field(grp));
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buf_len = 2 * half_len;
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if ((databuf = OPENSSL_malloc(buf_len)) == NULL) {
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GOSTerr(GOST_F_VKO_COMPUTE_KEY, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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/*
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* Serialize elliptic curve point same way as we do it when saving key
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*/
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if (BN_bn2lebinpad(X, databuf, half_len) != half_len
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|| BN_bn2lebinpad(Y, databuf + half_len, half_len) != half_len)
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goto err;
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if ((mdctx = EVP_MD_CTX_new()) == NULL) {
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GOSTerr(GOST_F_VKO_COMPUTE_KEY, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (EVP_MD_CTX_init(mdctx) == 0
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|| EVP_DigestInit_ex(mdctx, md, NULL) == 0
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|| EVP_DigestUpdate(mdctx, databuf, buf_len) == 0
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|| EVP_DigestFinal_ex(mdctx, shared_key, NULL) == 0) {
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GOSTerr(GOST_F_VKO_COMPUTE_KEY, ERR_R_EVP_LIB);
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goto err;
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}
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ret = (EVP_MD_size(md) > 0) ? EVP_MD_size(md) : 0;
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err:
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BN_CTX_end(ctx);
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BN_CTX_free(ctx);
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EC_POINT_free(pnt);
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EVP_MD_CTX_free(mdctx);
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OPENSSL_free(databuf);
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return ret;
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}
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/*
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* KEG Algorithm described in R 1323565.1.020-2018 6.4.5.1.
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* keyout expected to be 64 bytes
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* */
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static int gost_keg(const unsigned char *ukm_source, int pkey_nid,
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const EC_POINT *pub_key, const EC_KEY *priv_key,
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unsigned char *keyout)
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{
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/* Adjust UKM */
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unsigned char real_ukm[16];
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size_t keylen = 0;
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memset(real_ukm, 0, 16);
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if (memcmp(ukm_source, real_ukm, 16) == 0)
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real_ukm[15] = 1;
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else {
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memcpy(real_ukm, ukm_source, 16);
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BUF_reverse(real_ukm, NULL, 16);
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}
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switch (pkey_nid) {
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case NID_id_GostR3410_2012_512:
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keylen =
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VKO_compute_key(keyout, pub_key, priv_key, real_ukm, 16,
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NID_id_GostR3411_2012_512);
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return (keylen) ? keylen : 0;
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break;
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case NID_id_GostR3410_2012_256:
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{
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unsigned char tmpkey[32];
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keylen =
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VKO_compute_key(tmpkey, pub_key, priv_key, real_ukm, 16,
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NID_id_GostR3411_2012_256);
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if (keylen == 0)
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return 0;
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if (gost_kdftree2012_256
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(keyout, 64, tmpkey, 32, (const unsigned char *)"kdf tree", 8,
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ukm_source + 16, 8, 1) > 0)
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keylen = 64;
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else
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keylen = 0;
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OPENSSL_cleanse(tmpkey, 32);
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return (keylen) ? keylen : 0;
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}
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default:
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return 0;
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}
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}
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/*
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* EVP_PKEY_METHOD callback derive.
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* Implements VKO R 34.10-2001/2012 algorithms
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*/
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/*
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* Backend for EVP_PKEY_derive()
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* It have KEG mode (default) and VKO mode (enable by EVP_PKEY_CTRL_SET_VKO).
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*/
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int pkey_gost_ec_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen)
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{
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/*
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* Public key of peer in the ctx field peerkey
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* Our private key in the ctx pkey
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* ukm is in the algorithm specific context data
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*/
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EVP_PKEY *my_key = EVP_PKEY_CTX_get0_pkey(ctx);
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EVP_PKEY *peer_key = EVP_PKEY_CTX_get0_peerkey(ctx);
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struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(ctx);
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int dgst_nid = NID_undef;
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if (!data || data->shared_ukm_size == 0) {
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GOSTerr(GOST_F_PKEY_GOST_EC_DERIVE, GOST_R_UKM_NOT_SET);
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return 0;
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}
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/* VKO */
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if (data->vko_dgst_nid) {
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if (!key) {
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*keylen = data->vko_dgst_nid == NID_id_GostR3411_2012_256? 32 : 64;
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return 1;
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}
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*keylen = VKO_compute_key(key,
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EC_KEY_get0_public_key(EVP_PKEY_get0(peer_key)),
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(EC_KEY *)EVP_PKEY_get0(my_key),
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data->shared_ukm, data->shared_ukm_size,
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data->vko_dgst_nid);
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return (*keylen) ? 1 : 0;
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}
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/*
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* shared_ukm_size = 8 stands for pre-2018 cipher suites
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* It means 32 bytes of key length, 8 byte UKM, 32-bytes hash
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*
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* shared_ukm_size = 32 stands for post-2018 cipher suites
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* It means 64 bytes of shared_key, 16 bytes of UKM and either
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* 64 bytes of hash or 64 bytes of TLSTREE output
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* */
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switch (data->shared_ukm_size) {
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case 8:
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{
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if (key == NULL) {
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*keylen = 32;
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return 1;
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}
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EVP_PKEY_get_default_digest_nid(my_key, &dgst_nid);
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if (dgst_nid == NID_id_GostR3411_2012_512)
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dgst_nid = NID_id_GostR3411_2012_256;
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*keylen =
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VKO_compute_key(key,
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EC_KEY_get0_public_key(EVP_PKEY_get0(peer_key)),
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(EC_KEY *)EVP_PKEY_get0(my_key),
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data->shared_ukm, 8, dgst_nid);
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return (*keylen) ? 1 : 0;
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}
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break;
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case 32:
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{
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if (key == NULL) {
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*keylen = 64;
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return 1;
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}
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*keylen = gost_keg(data->shared_ukm, EVP_PKEY_id(my_key),
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EC_KEY_get0_public_key(EVP_PKEY_get0(peer_key)),
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(EC_KEY *)EVP_PKEY_get0(my_key), key);
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return (*keylen) ? 1 : 0;
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}
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break;
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default:
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return 0;
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}
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}
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/*
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* Generates ephemeral key based on pubk algorithm computes shared key using
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* VKO and returns filled up GOST_KEY_TRANSPORT structure
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*/
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/*
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* EVP_PKEY_METHOD callback encrypt
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* Implementation of GOST2001/12 key transport, cryptopro variation
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*/
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static int pkey_GOST_ECcp_encrypt(EVP_PKEY_CTX *pctx, unsigned char *out,
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size_t *out_len, const unsigned char *key,
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size_t key_len)
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{
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GOST_KEY_TRANSPORT *gkt = NULL;
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EVP_PKEY *pubk = EVP_PKEY_CTX_get0_pkey(pctx);
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struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(pctx);
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int pkey_nid = EVP_PKEY_base_id(pubk);
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ASN1_OBJECT *crypt_params_obj = (pkey_nid == NID_id_GostR3410_2001 || pkey_nid == NID_id_GostR3410_2001DH) ?
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OBJ_nid2obj(NID_id_Gost28147_89_CryptoPro_A_ParamSet) :
|
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OBJ_nid2obj(NID_id_tc26_gost_28147_param_Z);
|
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const struct gost_cipher_info *param =
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get_encryption_params(crypt_params_obj);
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unsigned char ukm[8], shared_key[32], crypted_key[44];
|
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int ret = 0;
|
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int key_is_ephemeral = 1;
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gost_ctx cctx;
|
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EVP_PKEY *sec_key = EVP_PKEY_CTX_get0_peerkey(pctx);
|
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int res_len = 0;
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|
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if (data->shared_ukm_size) {
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memcpy(ukm, data->shared_ukm, 8);
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} else {
|
|
if (RAND_bytes(ukm, 8) <= 0) {
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|
GOSTerr(GOST_F_PKEY_GOST_ECCP_ENCRYPT, GOST_R_RNG_ERROR);
|
|
return 0;
|
|
}
|
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}
|
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if (!param)
|
|
goto err;
|
|
/* Check for private key in the peer_key of context */
|
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if (sec_key) {
|
|
key_is_ephemeral = 0;
|
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if (!gost_get0_priv_key(sec_key)) {
|
|
GOSTerr(GOST_F_PKEY_GOST_ECCP_ENCRYPT,
|
|
GOST_R_NO_PRIVATE_PART_OF_NON_EPHEMERAL_KEYPAIR);
|
|
goto err;
|
|
}
|
|
} else {
|
|
key_is_ephemeral = 1;
|
|
if (out) {
|
|
sec_key = EVP_PKEY_new();
|
|
if (!EVP_PKEY_assign(sec_key, EVP_PKEY_base_id(pubk), EC_KEY_new())
|
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|| !EVP_PKEY_copy_parameters(sec_key, pubk)
|
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|| !gost_ec_keygen(EVP_PKEY_get0(sec_key))) {
|
|
GOSTerr(GOST_F_PKEY_GOST_ECCP_ENCRYPT,
|
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GOST_R_ERROR_COMPUTING_SHARED_KEY);
|
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goto err;
|
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}
|
|
}
|
|
}
|
|
if (out) {
|
|
int dgst_nid = NID_undef;
|
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EVP_PKEY_get_default_digest_nid(pubk, &dgst_nid);
|
|
if (dgst_nid == NID_id_GostR3411_2012_512)
|
|
dgst_nid = NID_id_GostR3411_2012_256;
|
|
|
|
if (!VKO_compute_key(shared_key,
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EC_KEY_get0_public_key(EVP_PKEY_get0(pubk)),
|
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EVP_PKEY_get0(sec_key), ukm, 8, dgst_nid)) {
|
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GOSTerr(GOST_F_PKEY_GOST_ECCP_ENCRYPT,
|
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GOST_R_ERROR_COMPUTING_SHARED_KEY);
|
|
goto err;
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}
|
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gost_init(&cctx, param->sblock);
|
|
keyWrapCryptoPro(&cctx, shared_key, ukm, key, crypted_key);
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}
|
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gkt = GOST_KEY_TRANSPORT_new();
|
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if (!gkt) {
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goto err;
|
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}
|
|
if (!ASN1_OCTET_STRING_set(gkt->key_agreement_info->eph_iv, ukm, 8)) {
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goto err;
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}
|
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if (!ASN1_OCTET_STRING_set(gkt->key_info->imit, crypted_key + 40, 4)) {
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goto err;
|
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}
|
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if (!ASN1_OCTET_STRING_set
|
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(gkt->key_info->encrypted_key, crypted_key + 8, 32)) {
|
|
goto err;
|
|
}
|
|
if (key_is_ephemeral) {
|
|
if (!X509_PUBKEY_set
|
|
(&gkt->key_agreement_info->ephem_key, out ? sec_key : pubk)) {
|
|
GOSTerr(GOST_F_PKEY_GOST_ECCP_ENCRYPT,
|
|
GOST_R_CANNOT_PACK_EPHEMERAL_KEY);
|
|
goto err;
|
|
}
|
|
}
|
|
ASN1_OBJECT_free(gkt->key_agreement_info->cipher);
|
|
gkt->key_agreement_info->cipher = OBJ_nid2obj(param->nid);
|
|
if (key_is_ephemeral)
|
|
EVP_PKEY_free(sec_key);
|
|
if (!key_is_ephemeral) {
|
|
/* Set control "public key from client certificate used" */
|
|
if (EVP_PKEY_CTX_ctrl(pctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 3, NULL)
|
|
<= 0) {
|
|
GOSTerr(GOST_F_PKEY_GOST_ECCP_ENCRYPT, GOST_R_CTRL_CALL_FAILED);
|
|
goto err;
|
|
}
|
|
}
|
|
res_len = i2d_GOST_KEY_TRANSPORT(gkt, NULL);
|
|
if (res_len <= 0) {
|
|
GOSTerr(GOST_F_PKEY_GOST_ECCP_ENCRYPT, ERR_R_ASN1_LIB);
|
|
goto err;
|
|
}
|
|
|
|
if (out == NULL) {
|
|
*out_len = res_len;
|
|
ret = 1;
|
|
} else {
|
|
if ((size_t)res_len > *out_len) {
|
|
GOSTerr(GOST_F_PKEY_GOST_ECCP_ENCRYPT, GOST_R_INVALID_BUFFER_SIZE);
|
|
goto err;
|
|
}
|
|
if ((*out_len = i2d_GOST_KEY_TRANSPORT(gkt, &out)) > 0)
|
|
ret = 1;
|
|
else
|
|
GOSTerr(GOST_F_PKEY_GOST_ECCP_ENCRYPT, ERR_R_ASN1_LIB);
|
|
}
|
|
|
|
OPENSSL_cleanse(shared_key, sizeof(shared_key));
|
|
GOST_KEY_TRANSPORT_free(gkt);
|
|
return ret;
|
|
err:
|
|
OPENSSL_cleanse(shared_key, sizeof(shared_key));
|
|
if (key_is_ephemeral)
|
|
EVP_PKEY_free(sec_key);
|
|
GOST_KEY_TRANSPORT_free(gkt);
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* EVP_PKEY_METHOD callback decrypt
|
|
* Implementation of GOST2018 key transport
|
|
*/
|
|
static int pkey_gost2018_encrypt(EVP_PKEY_CTX *pctx, unsigned char *out,
|
|
size_t *out_len, const unsigned char *key,
|
|
size_t key_len)
|
|
{
|
|
PSKeyTransport_gost *pst = NULL;
|
|
EVP_PKEY *pubk = EVP_PKEY_CTX_get0_pkey(pctx);
|
|
struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(pctx);
|
|
int pkey_nid = EVP_PKEY_base_id(pubk);
|
|
unsigned char expkeys[64];
|
|
EVP_PKEY *sec_key = NULL;
|
|
int ret = 0;
|
|
int mac_nid = NID_undef;
|
|
size_t mac_len = 0;
|
|
int exp_len = 0, iv_len = 0;
|
|
unsigned char *exp_buf = NULL;
|
|
int key_is_ephemeral = 0;
|
|
int res_len = 0;
|
|
|
|
switch (data->cipher_nid) {
|
|
case NID_magma_ctr:
|
|
mac_nid = NID_magma_mac;
|
|
mac_len = 8;
|
|
iv_len = 4;
|
|
break;
|
|
case NID_grasshopper_ctr:
|
|
mac_nid = NID_grasshopper_mac;
|
|
mac_len = 16;
|
|
iv_len = 8;
|
|
break;
|
|
default:
|
|
GOSTerr(GOST_F_PKEY_GOST2018_ENCRYPT, GOST_R_INVALID_CIPHER);
|
|
return -1;
|
|
break;
|
|
}
|
|
exp_len = key_len + mac_len;
|
|
exp_buf = OPENSSL_malloc(exp_len);
|
|
if (!exp_buf) {
|
|
GOSTerr(GOST_F_PKEY_GOST2018_ENCRYPT, ERR_R_MALLOC_FAILURE);
|
|
return -1;
|
|
}
|
|
|
|
sec_key = EVP_PKEY_CTX_get0_peerkey(pctx);
|
|
if (!sec_key)
|
|
{
|
|
sec_key = EVP_PKEY_new();
|
|
if (sec_key == NULL) {
|
|
GOSTerr(GOST_F_PKEY_GOST2018_ENCRYPT, ERR_R_MALLOC_FAILURE );
|
|
goto err;
|
|
}
|
|
|
|
if (!EVP_PKEY_assign(sec_key, EVP_PKEY_base_id(pubk), EC_KEY_new())
|
|
|| !EVP_PKEY_copy_parameters(sec_key, pubk)
|
|
|| !gost_ec_keygen(EVP_PKEY_get0(sec_key))) {
|
|
GOSTerr(GOST_F_PKEY_GOST2018_ENCRYPT,
|
|
GOST_R_ERROR_COMPUTING_SHARED_KEY);
|
|
goto err;
|
|
}
|
|
key_is_ephemeral = 1;
|
|
}
|
|
|
|
if (data->shared_ukm_size == 0) {
|
|
if (RAND_bytes(data->shared_ukm, 32) <= 0) {
|
|
GOSTerr(GOST_F_PKEY_GOST2018_ENCRYPT, ERR_R_INTERNAL_ERROR);
|
|
goto err;
|
|
}
|
|
data->shared_ukm_size = 32;
|
|
}
|
|
|
|
if (gost_keg(data->shared_ukm, pkey_nid,
|
|
EC_KEY_get0_public_key(EVP_PKEY_get0(pubk)),
|
|
EVP_PKEY_get0(sec_key), expkeys) <= 0) {
|
|
GOSTerr(GOST_F_PKEY_GOST2018_ENCRYPT,
|
|
GOST_R_ERROR_COMPUTING_EXPORT_KEYS);
|
|
goto err;
|
|
}
|
|
|
|
if (gost_kexp15(key, key_len, data->cipher_nid, expkeys + 32,
|
|
mac_nid, expkeys + 0, data->shared_ukm + 24, iv_len,
|
|
exp_buf, &exp_len) <= 0) {
|
|
GOSTerr(GOST_F_PKEY_GOST2018_ENCRYPT, GOST_R_CANNOT_PACK_EPHEMERAL_KEY);
|
|
goto err;
|
|
}
|
|
|
|
pst = PSKeyTransport_gost_new();
|
|
if (!pst) {
|
|
GOSTerr(GOST_F_PKEY_GOST2018_ENCRYPT, ERR_R_MALLOC_FAILURE);
|
|
goto err;
|
|
}
|
|
|
|
pst->ukm = ASN1_OCTET_STRING_new();
|
|
if (pst->ukm == NULL) {
|
|
GOSTerr(GOST_F_PKEY_GOST2018_ENCRYPT, ERR_R_MALLOC_FAILURE);
|
|
goto err;
|
|
}
|
|
|
|
if (!ASN1_OCTET_STRING_set(pst->ukm, data->shared_ukm, data->shared_ukm_size)) {
|
|
GOSTerr(GOST_F_PKEY_GOST2018_ENCRYPT, ERR_R_MALLOC_FAILURE);
|
|
goto err;
|
|
}
|
|
|
|
if (!ASN1_OCTET_STRING_set(pst->psexp, exp_buf, exp_len)) {
|
|
GOSTerr(GOST_F_PKEY_GOST2018_ENCRYPT, ERR_R_MALLOC_FAILURE);
|
|
goto err;
|
|
}
|
|
|
|
if (!X509_PUBKEY_set(&pst->ephem_key, out ? sec_key : pubk)) {
|
|
GOSTerr(GOST_F_PKEY_GOST2018_ENCRYPT, GOST_R_CANNOT_PACK_EPHEMERAL_KEY);
|
|
goto err;
|
|
}
|
|
|
|
res_len = i2d_PSKeyTransport_gost(pst, NULL);
|
|
if (res_len <= 0) {
|
|
GOSTerr(GOST_F_PKEY_GOST2018_ENCRYPT, ERR_R_ASN1_LIB);
|
|
goto err;
|
|
}
|
|
|
|
if (out == NULL) {
|
|
*out_len = res_len;
|
|
ret = 1;
|
|
} else {
|
|
if ((size_t)res_len > *out_len) {
|
|
GOSTerr(GOST_F_PKEY_GOST2018_ENCRYPT, GOST_R_INVALID_BUFFER_SIZE);
|
|
goto err;
|
|
}
|
|
if ((*out_len = i2d_PSKeyTransport_gost(pst, &out)) > 0)
|
|
ret = 1;
|
|
else
|
|
GOSTerr(GOST_F_PKEY_GOST2018_ENCRYPT, ERR_R_ASN1_LIB);
|
|
}
|
|
|
|
err:
|
|
OPENSSL_cleanse(expkeys, sizeof(expkeys));
|
|
if (key_is_ephemeral)
|
|
EVP_PKEY_free(sec_key);
|
|
|
|
PSKeyTransport_gost_free(pst);
|
|
OPENSSL_free(exp_buf);
|
|
return ret;
|
|
}
|
|
|
|
int pkey_gost_encrypt(EVP_PKEY_CTX *pctx, unsigned char *out,
|
|
size_t *out_len, const unsigned char *key, size_t key_len)
|
|
{
|
|
struct gost_pmeth_data *gctx = EVP_PKEY_CTX_get_data(pctx);
|
|
switch (gctx->cipher_nid)
|
|
{
|
|
case NID_id_Gost28147_89:
|
|
case NID_undef: /* FIXME */
|
|
return pkey_GOST_ECcp_encrypt(pctx, out, out_len, key, key_len);
|
|
break;
|
|
case NID_kuznyechik_ctr:
|
|
case NID_magma_ctr:
|
|
return pkey_gost2018_encrypt(pctx, out, out_len, key, key_len);
|
|
break;
|
|
default:
|
|
GOSTerr(GOST_F_PKEY_GOST_ENCRYPT, ERR_R_INTERNAL_ERROR);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* EVP_PKEY_METHOD callback decrypt
|
|
* Implementation of GOST2001/12 key transport, cryptopro variation
|
|
*/
|
|
static int pkey_GOST_ECcp_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];
|
|
gost_ctx ctx;
|
|
const struct gost_cipher_info *param = NULL;
|
|
EVP_PKEY *eph_key = NULL, *peerkey = NULL;
|
|
int dgst_nid = NID_undef;
|
|
|
|
gkt = d2i_GOST_KEY_TRANSPORT(NULL, (const unsigned char **)&p, in_len);
|
|
if (!gkt) {
|
|
GOSTerr(GOST_F_PKEY_GOST_ECCP_DECRYPT,
|
|
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) {
|
|
if (EVP_PKEY_derive_set_peer(pctx, eph_key) <= 0) {
|
|
GOSTerr(GOST_F_PKEY_GOST_ECCP_DECRYPT,
|
|
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) {
|
|
GOSTerr(GOST_F_PKEY_GOST_ECCP_DECRYPT, GOST_R_CTRL_CALL_FAILED);
|
|
goto err;
|
|
}
|
|
}
|
|
peerkey = EVP_PKEY_CTX_get0_peerkey(pctx);
|
|
if (!peerkey) {
|
|
GOSTerr(GOST_F_PKEY_GOST_ECCP_DECRYPT, GOST_R_NO_PEER_KEY);
|
|
goto err;
|
|
}
|
|
|
|
param = get_encryption_params(gkt->key_agreement_info->cipher);
|
|
if (!param) {
|
|
goto err;
|
|
}
|
|
|
|
gost_init(&ctx, param->sblock);
|
|
OPENSSL_assert(gkt->key_agreement_info->eph_iv->length == 8);
|
|
memcpy(wrappedKey, gkt->key_agreement_info->eph_iv->data, 8);
|
|
OPENSSL_assert(gkt->key_info->encrypted_key->length == 32);
|
|
memcpy(wrappedKey + 8, gkt->key_info->encrypted_key->data, 32);
|
|
OPENSSL_assert(gkt->key_info->imit->length == 4);
|
|
memcpy(wrappedKey + 40, gkt->key_info->imit->data, 4);
|
|
|
|
EVP_PKEY_get_default_digest_nid(priv, &dgst_nid);
|
|
if (dgst_nid == NID_id_GostR3411_2012_512)
|
|
dgst_nid = NID_id_GostR3411_2012_256;
|
|
|
|
if (!VKO_compute_key(sharedKey,
|
|
EC_KEY_get0_public_key(EVP_PKEY_get0(peerkey)),
|
|
EVP_PKEY_get0(priv), wrappedKey, 8, dgst_nid)) {
|
|
GOSTerr(GOST_F_PKEY_GOST_ECCP_DECRYPT,
|
|
GOST_R_ERROR_COMPUTING_SHARED_KEY);
|
|
goto err;
|
|
}
|
|
if (!keyUnwrapCryptoPro(&ctx, sharedKey, wrappedKey, key)) {
|
|
GOSTerr(GOST_F_PKEY_GOST_ECCP_DECRYPT,
|
|
GOST_R_ERROR_COMPUTING_SHARED_KEY);
|
|
goto err;
|
|
}
|
|
|
|
*key_len = 32;
|
|
ret = 1;
|
|
err:
|
|
OPENSSL_cleanse(sharedKey, sizeof(sharedKey));
|
|
EVP_PKEY_free(eph_key);
|
|
GOST_KEY_TRANSPORT_free(gkt);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* EVP_PKEY_METHOD callback decrypt
|
|
* Implementation of GOST2018 key transport
|
|
*/
|
|
static int pkey_gost2018_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;
|
|
struct gost_pmeth_data *data;
|
|
EVP_PKEY *priv;
|
|
PSKeyTransport_gost *pst = NULL;
|
|
int ret = 0;
|
|
unsigned char expkeys[64];
|
|
EVP_PKEY *eph_key = NULL;
|
|
int pkey_nid;
|
|
int mac_nid = NID_undef;
|
|
int iv_len = 0;
|
|
|
|
if (!(data = EVP_PKEY_CTX_get_data(pctx)) ||
|
|
!(priv = EVP_PKEY_CTX_get0_pkey(pctx))) {
|
|
GOSTerr(GOST_F_PKEY_GOST2018_DECRYPT, GOST_R_ERROR_COMPUTING_EXPORT_KEYS);
|
|
ret = 0;
|
|
goto err;
|
|
}
|
|
pkey_nid = EVP_PKEY_base_id(priv);
|
|
|
|
switch (data->cipher_nid) {
|
|
case NID_magma_ctr:
|
|
mac_nid = NID_magma_mac;
|
|
iv_len = 4;
|
|
break;
|
|
case NID_grasshopper_ctr:
|
|
mac_nid = NID_grasshopper_mac;
|
|
iv_len = 8;
|
|
break;
|
|
default:
|
|
GOSTerr(GOST_F_PKEY_GOST2018_DECRYPT, GOST_R_INVALID_CIPHER);
|
|
return -1;
|
|
break;
|
|
}
|
|
|
|
pst = d2i_PSKeyTransport_gost(NULL, (const unsigned char **)&p, in_len);
|
|
if (!pst) {
|
|
GOSTerr(GOST_F_PKEY_GOST2018_DECRYPT,
|
|
GOST_R_ERROR_PARSING_KEY_TRANSPORT_INFO);
|
|
return -1;
|
|
}
|
|
|
|
eph_key = X509_PUBKEY_get(pst->ephem_key);
|
|
/*
|
|
* TODO beldmit
|
|
1. Checks the next three conditions fulfilling and terminates the
|
|
connection with fatal error if not.
|
|
|
|
o Q_eph is on the same curve as server public key;
|
|
|
|
o Q_eph is not equal to zero point;
|
|
|
|
o q * Q_eph is not equal to zero point.
|
|
*/
|
|
if (eph_key == NULL) {
|
|
GOSTerr(GOST_F_PKEY_GOST2018_DECRYPT,
|
|
GOST_R_ERROR_COMPUTING_EXPORT_KEYS);
|
|
ret = 0;
|
|
goto err;
|
|
}
|
|
|
|
if (data->shared_ukm_size == 0 && pst->ukm != NULL) {
|
|
if (EVP_PKEY_CTX_ctrl(pctx, -1, -1, EVP_PKEY_CTRL_SET_IV,
|
|
ASN1_STRING_length(pst->ukm), (void *)ASN1_STRING_get0_data(pst->ukm)) < 0) {
|
|
GOSTerr(GOST_F_PKEY_GOST2018_DECRYPT, GOST_R_UKM_NOT_SET);
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
if (gost_keg(data->shared_ukm, pkey_nid,
|
|
EC_KEY_get0_public_key(EVP_PKEY_get0(eph_key)),
|
|
EVP_PKEY_get0(priv), expkeys) <= 0) {
|
|
GOSTerr(GOST_F_PKEY_GOST2018_DECRYPT,
|
|
GOST_R_ERROR_COMPUTING_EXPORT_KEYS);
|
|
goto err;
|
|
}
|
|
|
|
if (gost_kimp15(ASN1_STRING_get0_data(pst->psexp),
|
|
ASN1_STRING_length(pst->psexp), data->cipher_nid,
|
|
expkeys + 32, mac_nid, expkeys + 0, data->shared_ukm + 24,
|
|
iv_len, key) <= 0) {
|
|
GOSTerr(GOST_F_PKEY_GOST2018_DECRYPT, GOST_R_CANNOT_UNPACK_EPHEMERAL_KEY);
|
|
goto err;
|
|
}
|
|
|
|
*key_len = 32;
|
|
ret = 1;
|
|
err:
|
|
OPENSSL_cleanse(expkeys, sizeof(expkeys));
|
|
EVP_PKEY_free(eph_key);
|
|
PSKeyTransport_gost_free(pst);
|
|
return ret;
|
|
}
|
|
|
|
int pkey_gost_decrypt(EVP_PKEY_CTX *pctx, unsigned char *key,
|
|
size_t *key_len, const unsigned char *in, size_t in_len)
|
|
{
|
|
struct gost_pmeth_data *gctx = EVP_PKEY_CTX_get_data(pctx);
|
|
|
|
if (key == NULL) {
|
|
*key_len = 32;
|
|
return 1;
|
|
}
|
|
|
|
if (key != NULL && *key_len < 32) {
|
|
GOSTerr(GOST_F_PKEY_GOST_DECRYPT, GOST_R_INVALID_BUFFER_SIZE);
|
|
return 0;
|
|
}
|
|
|
|
switch (gctx->cipher_nid)
|
|
{
|
|
case NID_id_Gost28147_89:
|
|
case NID_undef: /* FIXME */
|
|
return pkey_GOST_ECcp_decrypt(pctx, key, key_len, in, in_len);
|
|
case NID_kuznyechik_ctr:
|
|
case NID_magma_ctr:
|
|
return pkey_gost2018_decrypt(pctx, key, key_len, in, in_len);
|
|
default:
|
|
GOSTerr(GOST_F_PKEY_GOST_DECRYPT, ERR_R_INTERNAL_ERROR);
|
|
return -1;
|
|
}
|
|
}
|
|
/* vim: set expandtab cinoptions=\:0,l1,t0,g0,(0 sw=4 : */
|