/**********************************************************************
* gost_ec_keyx.c *
+ * *
* Copyright (c) 2005-2013 Cryptocom LTD *
+ * Copyright (c) 2018,2020 Dmitry Belyavskiy <beldmit@gmail.com> *
+ * Copyright (c) 2020 Billy Brumley <bbrumley@gmail.com> *
+ * *
* This file is distributed under the same license as OpenSSL *
* *
- * VK0 34.10-2001 key exchange and GOST R 34.10-2001 *
+ * VK0 R 50.1.113-2016 / RFC 7836 *
+ * KEG R 1323565.1.020-2018 *
+ * VK0 34.10-2001 key exchange and GOST R 34.10-2001 (RFC 4357) *
* based PKCS7/SMIME support *
* Requires OpenSSL 0.9.9 for compilation *
**********************************************************************/
#include "gost_lcl.h"
/* Implementation of CryptoPro VKO 34.10-2001/2012 algorithm */
-static int VKO_compute_key(unsigned char *shared_key, size_t shared_key_size,
- const EC_POINT *pub_key, EC_KEY *priv_key,
- const unsigned char *ukm, int dgst_nid)
+int VKO_compute_key(unsigned char *shared_key,
+ const EC_POINT *pub_key, const EC_KEY *priv_key,
+ const unsigned char *ukm, const size_t ukm_size,
+ const int vko_dgst_nid)
{
- unsigned char *databuf = NULL, *hashbuf = NULL;
- BIGNUM *UKM = NULL, *p = NULL, *order = NULL, *X = NULL, *Y = NULL;
- const BIGNUM *key = EC_KEY_get0_private_key(priv_key);
- EC_POINT *pnt = EC_POINT_new(EC_KEY_get0_group(priv_key));
- int i;
- BN_CTX *ctx = BN_CTX_new();
+ unsigned char *databuf = NULL;
+ BIGNUM *scalar = NULL, *X = NULL, *Y = NULL;
+ const EC_GROUP *grp = NULL;
+ EC_POINT *pnt = NULL;
+ BN_CTX *ctx = NULL;
EVP_MD_CTX *mdctx = NULL;
const EVP_MD *md = NULL;
- int effective_dgst_nid = (dgst_nid == NID_id_GostR3411_2012_512) ?
- NID_id_GostR3411_2012_256 : dgst_nid;
- int buf_len = (dgst_nid == NID_id_GostR3411_2012_512) ? 128 : 64,
- half_len = buf_len >> 1;
+ int buf_len, half_len;
+ int ret = 0;
- if (!ctx) {
+ if ((ctx = BN_CTX_secure_new()) == NULL) {
GOSTerr(GOST_F_VKO_COMPUTE_KEY, ERR_R_MALLOC_FAILURE);
return 0;
}
BN_CTX_start(ctx);
- databuf = OPENSSL_malloc(buf_len);
- hashbuf = OPENSSL_malloc(buf_len);
- if (!databuf || !hashbuf) {
- GOSTerr(GOST_F_VKO_COMPUTE_KEY, ERR_R_MALLOC_FAILURE);
- goto err;
- }
-
- md = EVP_get_digestbynid(effective_dgst_nid);
+ md = EVP_get_digestbynid(vko_dgst_nid);
if (!md) {
GOSTerr(GOST_F_VKO_COMPUTE_KEY, GOST_R_INVALID_DIGEST_TYPE);
goto err;
}
- UKM = hashsum2bn(ukm, 8);
- p = BN_CTX_get(ctx);
- order = BN_CTX_get(ctx);
+ grp = EC_KEY_get0_group(priv_key);
+ scalar = BN_CTX_get(ctx);
X = BN_CTX_get(ctx);
- Y = BN_CTX_get(ctx);
- EC_GROUP_get_order(EC_KEY_get0_group(priv_key), order, ctx);
- BN_mod_mul(p, key, UKM, order, ctx);
- if (!EC_POINT_mul
- (EC_KEY_get0_group(priv_key), pnt, NULL, pub_key, p, ctx)) {
+
+ if ((Y = BN_CTX_get(ctx)) == NULL
+ || (pnt = EC_POINT_new(grp)) == NULL
+ || BN_lebin2bn(ukm, ukm_size, scalar) == NULL
+ || !BN_mod_mul(scalar, scalar, EC_KEY_get0_private_key(priv_key),
+ EC_GROUP_get0_order(grp), ctx))
+ goto err;
+
+#if 0
+ /*-
+ * These two curves have cofactor 4; the rest have cofactor 1.
+ * But currently gost_ec_point_mul takes care of the cofactor clearing,
+ * hence this code is not needed.
+ */
+ switch (EC_GROUP_get_curve_name(grp)) {
+ case NID_id_tc26_gost_3410_2012_256_paramSetA:
+ case NID_id_tc26_gost_3410_2012_512_paramSetC:
+ if (!BN_lshift(scalar, scalar, 2))
+ goto err;
+ break;
+ }
+#endif
+
+ if (!gost_ec_point_mul(grp, pnt, NULL, pub_key, scalar, ctx)) {
GOSTerr(GOST_F_VKO_COMPUTE_KEY, GOST_R_ERROR_POINT_MUL);
goto err;
}
- EC_POINT_get_affine_coordinates_GFp(EC_KEY_get0_group(priv_key),
- pnt, X, Y, ctx);
+ if (!EC_POINT_get_affine_coordinates(grp, pnt, X, Y, ctx)) {
+ GOSTerr(GOST_F_VKO_COMPUTE_KEY, ERR_R_EC_LIB);
+ goto err;
+ }
+
+ half_len = BN_num_bytes(EC_GROUP_get0_field(grp));
+ buf_len = 2 * half_len;
+ if ((databuf = OPENSSL_malloc(buf_len)) == NULL) {
+ GOSTerr(GOST_F_VKO_COMPUTE_KEY, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+
/*
* Serialize elliptic curve point same way as we do it when saving key
*/
- store_bignum(Y, databuf, half_len);
- store_bignum(X, databuf + half_len, half_len);
- /* And reverse byte order of whole buffer */
- for (i = 0; i < buf_len; i++) {
- hashbuf[buf_len - 1 - i] = databuf[i];
- }
- mdctx = EVP_MD_CTX_new();
- if (!mdctx) {
- GOSTerr(GOST_F_VKO_COMPUTE_KEY, ERR_R_MALLOC_FAILURE);
- goto err;
- }
- EVP_MD_CTX_init(mdctx);
- EVP_DigestInit_ex(mdctx, md, NULL);
- EVP_DigestUpdate(mdctx, hashbuf, buf_len);
- EVP_DigestFinal_ex(mdctx, shared_key, NULL);
+ if (BN_bn2lebinpad(X, databuf, half_len) != half_len
+ || BN_bn2lebinpad(Y, databuf + half_len, half_len) != half_len)
+ goto err;
+
+ if ((mdctx = EVP_MD_CTX_new()) == NULL) {
+ GOSTerr(GOST_F_VKO_COMPUTE_KEY, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+
+ if (EVP_MD_CTX_init(mdctx) == 0
+ || EVP_DigestInit_ex(mdctx, md, NULL) == 0
+ || EVP_DigestUpdate(mdctx, databuf, buf_len) == 0
+ || EVP_DigestFinal_ex(mdctx, shared_key, NULL) == 0) {
+ GOSTerr(GOST_F_VKO_COMPUTE_KEY, ERR_R_EVP_LIB);
+ goto err;
+ }
+
+ ret = (EVP_MD_size(md) > 0) ? EVP_MD_size(md) : 0;
+
err:
- BN_free(UKM);
BN_CTX_end(ctx);
BN_CTX_free(ctx);
-
EC_POINT_free(pnt);
-
EVP_MD_CTX_free(mdctx);
-
OPENSSL_free(databuf);
- OPENSSL_free(hashbuf);
- return 32;
+ return ret;
+}
+
+/*
+ * KEG Algorithm described in R 1323565.1.020-2018 6.4.5.1.
+ * keyout expected to be 64 bytes
+ * */
+static int gost_keg(const unsigned char *ukm_source, int pkey_nid,
+ const EC_POINT *pub_key, const EC_KEY *priv_key,
+ unsigned char *keyout)
+{
+/* Adjust UKM */
+ unsigned char real_ukm[16];
+ size_t keylen = 0;
+
+ memset(real_ukm, 0, 16);
+ if (memcmp(ukm_source, real_ukm, 16) == 0)
+ real_ukm[15] = 1;
+ else {
+ memcpy(real_ukm, ukm_source, 16);
+ BUF_reverse(real_ukm, NULL, 16);
+ }
+
+ switch (pkey_nid) {
+ case NID_id_GostR3410_2012_512:
+ keylen =
+ VKO_compute_key(keyout, pub_key, priv_key, real_ukm, 16,
+ NID_id_GostR3411_2012_512);
+ return (keylen) ? keylen : 0;
+ break;
+
+ case NID_id_GostR3410_2012_256:
+ {
+ unsigned char tmpkey[32];
+ keylen =
+ VKO_compute_key(tmpkey, pub_key, priv_key, real_ukm, 16,
+ NID_id_GostR3411_2012_256);
+
+ if (keylen == 0)
+ return 0;
+
+ if (gost_kdftree2012_256
+ (keyout, 64, tmpkey, 32, (const unsigned char *)"kdf tree", 8,
+ ukm_source + 16, 8, 1) > 0)
+ keylen = 64;
+ else
+ keylen = 0;
+
+ OPENSSL_cleanse(tmpkey, 32);
+ return (keylen) ? keylen : 0;
+ }
+ default:
+ return 0;
+ }
}
/*
* EVP_PKEY_METHOD callback derive.
* Implements VKO R 34.10-2001/2012 algorithms
*/
+/*
+ * Backend for EVP_PKEY_derive()
+ * It have KEG mode (default) and VKO mode (enable by EVP_PKEY_CTRL_SET_VKO).
+ */
int pkey_gost_ec_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen)
{
/*
struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(ctx);
int dgst_nid = NID_undef;
- if (!data || !data->shared_ukm) {
+ if (!data || data->shared_ukm_size == 0) {
GOSTerr(GOST_F_PKEY_GOST_EC_DERIVE, GOST_R_UKM_NOT_SET);
return 0;
}
- if (key == NULL) {
- *keylen = 32;
- return 32;
+ /* VKO */
+ if (data->vko_dgst_nid) {
+ if (!key) {
+ *keylen = data->vko_dgst_nid == NID_id_GostR3411_2012_256? 32 : 64;
+ return 1;
+ }
+ *keylen = VKO_compute_key(key,
+ EC_KEY_get0_public_key(EVP_PKEY_get0(peer_key)),
+ (EC_KEY *)EVP_PKEY_get0(my_key),
+ data->shared_ukm, data->shared_ukm_size,
+ data->vko_dgst_nid);
+ return (*keylen) ? 1 : 0;
}
- EVP_PKEY_get_default_digest_nid(my_key, &dgst_nid);
+ /*
+ * shared_ukm_size = 8 stands for pre-2018 cipher suites
+ * It means 32 bytes of key length, 8 byte UKM, 32-bytes hash
+ *
+ * shared_ukm_size = 32 stands for post-2018 cipher suites
+ * It means 64 bytes of shared_key, 16 bytes of UKM and either
+ * 64 bytes of hash or 64 bytes of TLSTREE output
+ * */
- *keylen =
- VKO_compute_key(key, 32,
- EC_KEY_get0_public_key(EVP_PKEY_get0(peer_key)),
- (EC_KEY *)EVP_PKEY_get0(my_key), data->shared_ukm,
- dgst_nid);
- return (*keylen) ? 1 : 0;
+ switch (data->shared_ukm_size) {
+ case 8:
+ {
+ if (key == NULL) {
+ *keylen = 32;
+ return 1;
+ }
+ EVP_PKEY_get_default_digest_nid(my_key, &dgst_nid);
+ if (dgst_nid == NID_id_GostR3411_2012_512)
+ dgst_nid = NID_id_GostR3411_2012_256;
+
+ *keylen =
+ VKO_compute_key(key,
+ EC_KEY_get0_public_key(EVP_PKEY_get0(peer_key)),
+ (EC_KEY *)EVP_PKEY_get0(my_key),
+ data->shared_ukm, 8, dgst_nid);
+ return (*keylen) ? 1 : 0;
+ }
+ break;
+ case 32:
+ {
+ if (key == NULL) {
+ *keylen = 64;
+ return 1;
+ }
+
+ *keylen = gost_keg(data->shared_ukm, EVP_PKEY_id(my_key),
+ EC_KEY_get0_public_key(EVP_PKEY_get0(peer_key)),
+ (EC_KEY *)EVP_PKEY_get0(my_key), key);
+ return (*keylen) ? 1 : 0;
+ }
+
+ break;
+ default:
+ return 0;
+ }
}
-/*
- * EVP_PKEY_METHOD callback encrypt
- * Implementation of GOST2001 key transport, cryptocom variation
- */
/*
* Generates ephemeral key based on pubk algorithm computes shared key using
* VKO and returns filled up GOST_KEY_TRANSPORT structure
/*
* EVP_PKEY_METHOD callback encrypt
- * Implementation of GOST2001 key transport, cryptopo variation
+ * Implementation of GOST2001/12 key transport, cryptopro variation
*/
-int pkey_GOST_ECcp_encrypt(EVP_PKEY_CTX *pctx, unsigned char *out,
+static int pkey_GOST_ECcp_encrypt(EVP_PKEY_CTX *pctx, unsigned char *out,
size_t *out_len, const unsigned char *key,
size_t key_len)
{
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);
- ASN1_OBJECT *crypt_params_obj = (pkey_nid == NID_id_GostR3410_2001) ?
+ ASN1_OBJECT *crypt_params_obj = (pkey_nid == NID_id_GostR3410_2001 || pkey_nid == NID_id_GostR3410_2001DH) ?
OBJ_nid2obj(NID_id_Gost28147_89_CryptoPro_A_ParamSet) :
OBJ_nid2obj(NID_id_tc26_gost_28147_param_Z);
const struct gost_cipher_info *param =
int key_is_ephemeral = 1;
gost_ctx cctx;
EVP_PKEY *sec_key = EVP_PKEY_CTX_get0_peerkey(pctx);
- if (data->shared_ukm) {
- memcpy(ukm, data->shared_ukm, 8);
- } else if (out) {
+ int res_len = 0;
+ if (data->shared_ukm_size) {
+ memcpy(ukm, data->shared_ukm, 8);
+ } else {
if (RAND_bytes(ukm, 8) <= 0) {
GOSTerr(GOST_F_PKEY_GOST_ECCP_ENCRYPT, GOST_R_RNG_ERROR);
return 0;
}
}
+ if (!param)
+ goto err;
/* Check for private key in the peer_key of context */
if (sec_key) {
key_is_ephemeral = 0;
key_is_ephemeral = 1;
if (out) {
sec_key = EVP_PKEY_new();
- EVP_PKEY_assign(sec_key, EVP_PKEY_base_id(pubk), EC_KEY_new());
- EVP_PKEY_copy_parameters(sec_key, pubk);
- if (!gost_ec_keygen(EVP_PKEY_get0(sec_key))) {
+ 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_GOST_ECCP_ENCRYPT,
+ GOST_R_ERROR_COMPUTING_SHARED_KEY);
goto err;
}
}
}
- if (!get_gost_engine_param(GOST_PARAM_CRYPT_PARAMS)
- && param == gost_cipher_list) {
- param = gost_cipher_list;
- }
if (out) {
int dgst_nid = NID_undef;
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, 32,
+ if (!VKO_compute_key(shared_key,
EC_KEY_get0_public_key(EVP_PKEY_get0(pubk)),
- EVP_PKEY_get0(sec_key), ukm, dgst_nid)) {
+ EVP_PKEY_get0(sec_key), ukm, 8, dgst_nid)) {
GOSTerr(GOST_F_PKEY_GOST_ECCP_ENCRYPT,
GOST_R_ERROR_COMPUTING_SHARED_KEY);
goto err;
goto err;
}
}
- if ((*out_len = i2d_GOST_KEY_TRANSPORT(gkt, out ? &out : NULL)) > 0)
+ 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);
/*
* EVP_PKEY_METHOD callback decrypt
- * Implementation of GOST2001 key transport, cryptopo variation
+ * Implementation of GOST2018 key transport
*/
-int pkey_GOST_ECcp_decrypt(EVP_PKEY_CTX *pctx, unsigned char *key,
+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)
{
EVP_PKEY *eph_key = NULL, *peerkey = NULL;
int dgst_nid = NID_undef;
- if (!key) {
- *key_len = 32;
- return 1;
- }
gkt = d2i_GOST_KEY_TRANSPORT(NULL, (const unsigned char **)&p, in_len);
if (!gkt) {
GOSTerr(GOST_F_PKEY_GOST_ECCP_DECRYPT,
memcpy(wrappedKey + 40, gkt->key_info->imit->data, 4);
EVP_PKEY_get_default_digest_nid(priv, &dgst_nid);
- if (!VKO_compute_key(sharedKey, 32,
+ 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, dgst_nid)) {
+ EVP_PKEY_get0(priv), wrappedKey, 8, dgst_nid)) {
GOSTerr(GOST_F_PKEY_GOST_ECCP_DECRYPT,
GOST_R_ERROR_COMPUTING_SHARED_KEY);
goto err;
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 : */
projects / openssl-gost / engine.git / blobdiff