int pkey_GOST94cp_encrypt(EVP_PKEY_CTX *ctx, unsigned char *out,
                          size_t *outlen, const unsigned char *key,
                          size_t key_len)
{
    GOST_KEY_TRANSPORT *gkt = NULL;
    unsigned char shared_key[32], ukm[8], crypted_key[44];
    const struct gost_cipher_info *param = get_encryption_params(NULL);
    EVP_PKEY *pubk = EVP_PKEY_CTX_get0_pkey(ctx);
    struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(ctx);
    gost_ctx cctx;
    int key_is_ephemeral = 1;
    int tmp_outlen;
    EVP_PKEY *mykey = EVP_PKEY_CTX_get0_peerkey(ctx);

    /* Do not use vizir cipher parameters with cryptopro */
    if (!get_gost_engine_param(GOST_PARAM_CRYPT_PARAMS)
        && param == gost_cipher_list) {
        param = gost_cipher_list + 1;
    }

    if (mykey) {
        /* If key already set, it is not ephemeral */
        key_is_ephemeral = 0;
        if (!gost_get0_priv_key(mykey)) {
            GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT,
                    GOST_R_NO_PRIVATE_PART_OF_NON_EPHEMERAL_KEYPAIR);
            goto err;
        }
    } else {
        /* Otherwise generate ephemeral key */
        key_is_ephemeral = 1;
        if (out) {
            mykey = EVP_PKEY_new();
            EVP_PKEY_assign(mykey, EVP_PKEY_base_id(pubk), DSA_new());
            EVP_PKEY_copy_parameters(mykey, pubk);
            if (!gost_sign_keygen(EVP_PKEY_get0(mykey))) {
                goto err;
            }
        }
    }
    if (out)
        make_cp_exchange_key(gost_get0_priv_key(mykey), pubk, shared_key);
    if (data->shared_ukm) {
        memcpy(ukm, data->shared_ukm, 8);
    } else if (out) {
        if (RAND_bytes(ukm, 8) <= 0) {
            GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT,
                    GOST_R_RANDOM_GENERATOR_FAILURE);
            goto err;
        }
    }

    if (out) {
        gost_init(&cctx, param->sblock);
        keyWrapCryptoPro(&cctx, shared_key, ukm, key, crypted_key);
    }
    gkt = GOST_KEY_TRANSPORT_new();
    if (!gkt) {
        goto memerr;
    }
    if (!ASN1_OCTET_STRING_set(gkt->key_agreement_info->eph_iv, ukm, 8)) {
        goto memerr;
    }
    if (!ASN1_OCTET_STRING_set(gkt->key_info->imit, crypted_key + 40, 4)) {
        goto memerr;
    }
    if (!ASN1_OCTET_STRING_set
        (gkt->key_info->encrypted_key, crypted_key + 8, 32)) {
        goto memerr;
    }
    if (key_is_ephemeral) {
        if (!X509_PUBKEY_set
            (&gkt->key_agreement_info->ephem_key, out ? mykey : pubk)) {
            GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT,
                    GOST_R_CANNOT_PACK_EPHEMERAL_KEY);
            goto err;
        }
        if (out)
            EVP_PKEY_free(mykey);
    }
    ASN1_OBJECT_free(gkt->key_agreement_info->cipher);
    gkt->key_agreement_info->cipher = OBJ_nid2obj(param->nid);
    tmp_outlen = i2d_GOST_KEY_TRANSPORT(gkt, out ? &out : NULL);
    if (tmp_outlen <= 0) {
        GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT,
                GOST_R_ERROR_PACKING_KEY_TRANSPORT_INFO);
        goto err;
    }
    *outlen = tmp_outlen;
    if (!key_is_ephemeral) {
        /* Set control "public key from client certificate used" */
        if (EVP_PKEY_CTX_ctrl(ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 3, NULL) <=
            0) {
            GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT, GOST_R_CTRL_CALL_FAILED);
            goto err;
        }
    }
    GOST_KEY_TRANSPORT_free(gkt);
    return 1;
 memerr:
    if (key_is_ephemeral) {
        EVP_PKEY_free(mykey);
    }
    GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT, ERR_R_MALLOC_FAILURE);
 err:
    GOST_KEY_TRANSPORT_free(gkt);
    return -1;
}