diff --git a/include/gmssl/tls.h b/include/gmssl/tls.h
index df99c285..e15ec268 100644
--- a/include/gmssl/tls.h
+++ b/include/gmssl/tls.h
@@ -786,10 +786,6 @@ typedef struct {
 
 	uint8_t cert_chains[8192];
 	size_t cert_chains_len;
-	size_t cert_chains_cnt; // 这是一个多余的值，不应该存储多余的值
-//	size_t cert_chain_idx; // == 1 mean the first certificate
-	uint8_t *certs;	// 这里应该改为cert_chain，我们将certs表示为互相独立的证书
-	size_t certslen;
 
 
 	// 每个证书链都应该有附带的status_request和sct信息
@@ -804,8 +800,6 @@ typedef struct {
 	X509_KEY enc_keys[4];
 
 	size_t x509_keys_cnt;
-	X509_KEY signkey;
-	X509_KEY kenckey;
 
 	// 对于客户端来说，需要提供所有的CA证书，注意这里不是证书链，而是一个个独立的证书
 	// 对于服务器来说，在certificate_request中，需要从这些证书中提取dn_names，并发送给客户端，然后再验证客户端证书
@@ -1057,8 +1051,6 @@ typedef struct {
 
 
 	// 一般来说我们只要保存对方发过来的证书，因为己方的证书都在CTX中，对吗？
-	uint8_t server_certs[TLS_MAX_CERTIFICATES_SIZE]; // TODO: use ptr and malloc			
-	size_t server_certs_len;
 	uint8_t client_certs[TLS_MAX_CERTIFICATES_SIZE];
 	size_t client_certs_len;
 
@@ -1086,8 +1078,6 @@ typedef struct {
 	size_t peer_cert_chain_len;
 
 
-	X509_KEY sign_key;
-	X509_KEY kenc_key; // 应该作为服务器的SM2加密
 	X509_KEY server_enc_key;
 
 	int verify_result;
@@ -1102,9 +1092,6 @@ typedef struct {
 	HMAC_CTX client_write_mac_ctx;
 	HMAC_CTX server_write_mac_ctx;
 
-	SM4_KEY client_write_enc_key;
-	SM4_KEY server_write_enc_key;
-
 
 
 
@@ -1138,15 +1125,6 @@ typedef struct {
 	SM2_SIGN_CTX sign_ctx;
 	TLS_CLIENT_VERIFY_CTX client_verify_ctx;
 
-	// 所有这些命名为ecdh的都需要替换掉
-	uint16_t ecdh_named_curve;
-	X509_KEY ecdh_keys[2];
-	size_t ecdh_keys_cnt;
-	X509_KEY ecdh_key;
-	uint8_t peer_ecdh_point[65];
-	size_t peer_ecdh_point_len;
-
-
 	// HelloRetryRequest
 	int hello_retry_request;
 
diff --git a/src/tlcp.c b/src/tlcp.c
index b7426f8d..03cffcac 100644
--- a/src/tlcp.c
+++ b/src/tlcp.c
@@ -666,13 +666,6 @@ int tlcp_recv_server_certificate(TLS_CONNECT *conn)
 		tls_send_alert(conn, TLS_alert_unexpected_message);
 		return -1;
 	}
-	if (conn->peer_cert_chain_len > sizeof(conn->server_certs)) {
-		error_print();
-		tls_send_alert(conn, TLS_alert_bad_certificate);
-		return -1;
-	}
-	memcpy(conn->server_certs, conn->peer_cert_chain, conn->peer_cert_chain_len);
-	conn->server_certs_len = conn->peer_cert_chain_len;
 
 	if (x509_certs_get_cert_by_index(conn->peer_cert_chain, conn->peer_cert_chain_len,
 		0, &server_cert, &server_cert_len) != 1) {
@@ -1279,18 +1272,9 @@ static int tlcp_cert_chains_select(TLS_CONNECT *conn,
 			}
 		}
 
-		if (cert_chain_len > sizeof(conn->server_certs)) {
-			error_print();
-			return -1;
-		}
-
 		conn->cert_chain = cert_chain;
 		conn->cert_chain_len = cert_chain_len;
 		conn->cert_chain_idx = cert_chain_idx;
-		conn->sign_key = conn->ctx->x509_keys[cert_chain_idx - 1];
-		conn->kenc_key = conn->ctx->enc_keys[cert_chain_idx - 1];
-		memcpy(conn->server_certs, cert_chain, cert_chain_len);
-		conn->server_certs_len = cert_chain_len;
 		conn->signature_algorithms[0] = TLS_sig_sm2sig_sm3;
 		conn->signature_algorithms_cnt = 1;
 		return 1;
@@ -1392,7 +1376,6 @@ int tlcp_recv_client_hello(TLS_CONNECT *conn)
 	case TLS_cipher_ecc_sm4_cbc_sm3:
 	case TLS_cipher_ecc_sm4_gcm_sm3:
 		conn->signature_algorithms[0] = TLS_sig_sm2sig_sm3;
-		conn->ecdh_named_curve = 0;
 		break;
 	case TLS_cipher_ecdhe_sm4_cbc_sm3:
 	case TLS_cipher_ecdhe_sm4_gcm_sm3:
@@ -1700,7 +1683,21 @@ int tlcp_send_server_hello(TLS_CONNECT *conn)
 }
 
 
-// 因为这个就是发送证书而已，和tls12是没有什么区别的
+/*
+-- IBC_SM4_CBC_SM3 和 IBC_SM4_GCM_SM3 套件的服务器Certificate消息格式
+
+opaque ASN.1IBCParam<1..2^24-1>
+
+struct {
+	opaque ibc_id<1..2^16-1>;
+	ASN.1IBCParam ibc_parameter;
+} Certificate;
+
+其中ibc_id是服务器的SM9的ID，这个ID暂时是一个没有内部结构的字节串，后续有可能是一个DER结构的字节串
+ibc_parameter 是SM9 sm9_enc_master_key_to_der 输出的DER数据
+
+
+*/
 int tlcp_send_server_certificate(TLS_CONNECT *conn)
 {
 	int ret;
@@ -1759,6 +1756,8 @@ int tlcp_send_server_key_exchange(TLS_CONNECT *conn)
 	tls_trace("send ServerKeyExchange\n");
 
 	if (conn->recordlen == 0) {
+		X509_KEY *sign_key;
+
 		if (!conn->cert_chain || !conn->cert_chain_len || !conn->cert_chain_idx) {
 			error_print();
 			tls_send_alert(conn, TLS_alert_internal_error);
@@ -1780,7 +1779,13 @@ int tlcp_send_server_key_exchange(TLS_CONNECT *conn)
 			return -1;
 		}
 
-		if (sm2_sign_init(&sign_ctx, &conn->sign_key.u.sm2_key, SM2_DEFAULT_ID, SM2_DEFAULT_ID_LENGTH) != 1
+		sign_key = &conn->ctx->x509_keys[conn->cert_chain_idx - 1];
+		if (sign_key->algor != OID_ec_public_key || sign_key->algor_param != OID_sm2) {
+			error_print();
+			tls_send_alert(conn, TLS_alert_internal_error);
+			return -1;
+		}
+		if (sm2_sign_init(&sign_ctx, &sign_key->u.sm2_key, SM2_DEFAULT_ID, SM2_DEFAULT_ID_LENGTH) != 1
 			|| sm2_sign_update(&sign_ctx, conn->client_random, 32) != 1
 			|| sm2_sign_update(&sign_ctx, conn->server_random, 32) != 1
 			|| sm2_sign_update(&sign_ctx, server_ecc_params, server_ecc_params_len) != 1
@@ -2053,6 +2058,7 @@ int tlcp_recv_client_key_exchange(TLS_CONNECT *conn)
 	const uint8_t *enced_pms;
 	size_t enced_pms_len;
 	size_t pre_master_secret_len;
+	X509_KEY *enc_key;
 
 	tls_trace("recv ClientKeyExchange\n");
 
@@ -2069,8 +2075,13 @@ int tlcp_recv_client_key_exchange(TLS_CONNECT *conn)
 		tls_send_alert(conn, TLS_alert_unexpected_message);
 		return -1;
 	}
-	if (!conn->cert_chain_idx || conn->kenc_key.algor != OID_ec_public_key
-		|| conn->kenc_key.algor_param != OID_sm2) {
+	if (!conn->cert_chain_idx) {
+		error_print();
+		tls_send_alert(conn, TLS_alert_internal_error);
+		return -1;
+	}
+	enc_key = &conn->ctx->enc_keys[conn->cert_chain_idx - 1];
+	if (enc_key->algor != OID_ec_public_key || enc_key->algor_param != OID_sm2) {
 		error_print();
 		tls_send_alert(conn, TLS_alert_internal_error);
 		return -1;
@@ -2079,7 +2090,7 @@ int tlcp_recv_client_key_exchange(TLS_CONNECT *conn)
 	// FIXME:
 	// 这里需要检查一下密钥的长度，因为输入的长度是确定的，因此输出的密文长度应该也是确定的
 
-	if (sm2_decrypt(&conn->kenc_key.u.sm2_key, enced_pms, enced_pms_len,
+	if (sm2_decrypt(&enc_key->u.sm2_key, enced_pms, enced_pms_len,
 		conn->pre_master_secret, &pre_master_secret_len) != 1) {
 		error_print();
 		tls_send_alert(conn, TLS_alert_decrypt_error);
diff --git a/src/tls.c b/src/tls.c
index 472d2645..549312b6 100644
--- a/src/tls.c
+++ b/src/tls.c
@@ -2410,9 +2410,6 @@ void tls_ctx_cleanup(TLS_CTX *ctx)
 			x509_key_cleanup(&ctx->x509_keys[i]);
 			x509_key_cleanup(&ctx->enc_keys[i]);
 		}
-		x509_key_cleanup(&ctx->signkey);
-		x509_key_cleanup(&ctx->kenckey);
-		if (ctx->certs) free(ctx->certs);
 		if (ctx->cacerts) free(ctx->cacerts);
 		memset(ctx, 0, sizeof(TLS_CTX));
 	}
@@ -2678,18 +2675,9 @@ int tls_ctx_add_certificate_chain_and_key(TLS_CTX *ctx, const char *chainfile,
 }
 
 
-// 保留这个函数，相当于是对证书链的初始化
 int tls_ctx_set_certificate_and_key(TLS_CTX *ctx, const char *chainfile,
 	const char *keyfile, const char *keypass)
 {
-	int ret = -1;
-	uint8_t *certs = NULL;
-	size_t certslen;
-	FILE *keyfp = NULL;
-	const uint8_t *cert;
-	size_t certlen;
-	X509_KEY public_key;
-
 	if (!ctx || !chainfile || !keyfile || !keypass) {
 		error_print();
 		return -1;
@@ -2698,47 +2686,15 @@ int tls_ctx_set_certificate_and_key(TLS_CTX *ctx, const char *chainfile,
 		error_print();
 		return -1;
 	}
-	if (ctx->certs) {
+	if (ctx->cert_chains_len || ctx->x509_keys_cnt) {
 		error_print();
 		return -1;
 	}
-
-	if (x509_certs_new_from_file(&certs, &certslen, chainfile) != 1) {
-		error_print();
-		goto end;
-	}
-	if (x509_certs_get_cert_by_index(certs, certslen, 0, &cert, &certlen) != 1
-		|| x509_cert_get_subject_public_key(cert, certlen, &public_key) != 1) {
+	if (tls_ctx_add_certificate_chain_and_key(ctx, chainfile, keyfile, keypass) != 1) {
 		error_print();
 		return -1;
 	}
-
-	if (public_key.algor == OID_ec_public_key) {
-		if (!(keyfp = fopen(keyfile, "r"))) {
-			error_print();
-			return -1;
-		}
-	} else {
-		if (!(keyfp = fopen(keyfile, "rb+"))) {
-			error_print();
-			return -1;
-		}
-	}
-
-	if (x509_private_key_from_file(&ctx->signkey, public_key.algor, keypass, keyfp) != 1) {
-		error_print();
-		return -1;
-	}
-
-	ctx->certs = certs;
-	ctx->certslen = certslen;
-	certs = NULL;
-	ret = 1;
-
-end:
-	if (certs) free(certs);
-	if (keyfp) fclose(keyfp);
-	return ret;
+	return 1;
 }
 
 int tlcp_ctx_add_server_certificate_and_keys(TLS_CTX *ctx, const char *chainfile,
@@ -2832,12 +2788,7 @@ int tlcp_ctx_add_server_certificate_and_keys(TLS_CTX *ctx, const char *chainfile
 	}
 
 	ctx->cert_chains_len += cert_chains_len;
-	ctx->cert_chains_cnt++;
 	ctx->x509_keys_cnt++;
-	if (key_idx == 0) {
-		ctx->signkey = ctx->x509_keys[0];
-		ctx->kenckey = ctx->enc_keys[0];
-	}
 	ret = 1;
 
 end:
@@ -2969,6 +2920,29 @@ int tls_ctx_set_key_update_seq_num_limit(TLS_CTX *ctx, size_t max_seq_num)
 }
 
 
+static int tls_ctx_get_certificate_chain(const TLS_CTX *ctx, size_t idx,
+	const uint8_t **cert_chain, size_t *cert_chain_len)
+{
+	const uint8_t *p;
+	size_t len;
+	size_t i;
+
+	if (!ctx || !cert_chain || !cert_chain_len || !idx) {
+		error_print();
+		return -1;
+	}
+
+	p = ctx->cert_chains;
+	len = ctx->cert_chains_len;
+	for (i = 1; i <= idx; i++) {
+		if (tls_uint24array_from_bytes(cert_chain, cert_chain_len, &p, &len) != 1) {
+			error_print();
+			return -1;
+		}
+	}
+	return 1;
+}
+
 int tls_init(TLS_CONNECT *conn, TLS_CTX *ctx)
 {
 	if (!conn || !ctx) {
@@ -2986,21 +2960,22 @@ int tls_init(TLS_CONNECT *conn, TLS_CTX *ctx)
 	conn->protocol = ctx->protocol;
 
 
-	if (ctx->certslen > TLS_MAX_CERTIFICATES_SIZE) {
-		error_print();
-		return -1;
-	}
-	if (conn->is_client) {
-		memcpy(conn->client_certs, ctx->certs, ctx->certslen);
-		conn->client_certs_len = ctx->certslen;
-	} else {
-		memcpy(conn->server_certs, ctx->certs, ctx->certslen);
-		conn->server_certs_len = ctx->certslen;
+	if (conn->is_client && ctx->cert_chains_len) {
+		if (tls_ctx_get_certificate_chain(ctx, 1,
+			&conn->cert_chain, &conn->cert_chain_len) != 1) {
+			error_print();
+			return -1;
+		}
+		if (conn->cert_chain_len > sizeof(conn->client_certs)) {
+			error_print();
+			return -1;
+		}
+		memcpy(conn->client_certs, conn->cert_chain, conn->cert_chain_len);
+		conn->client_certs_len = conn->cert_chain_len;
+		conn->cert_chain_idx = 1;
 	}
 
 
-	conn->sign_key = ctx->signkey;
-	conn->kenc_key = ctx->kenckey;
 	conn->ctx = ctx;
 
 	conn->key_exchanges_cnt = ctx->key_exchanges_cnt;
diff --git a/src/tls12.c b/src/tls12.c
index e090fe3d..d9285080 100644
--- a/src/tls12.c
+++ b/src/tls12.c
@@ -757,10 +757,6 @@ int tls_handshake_init(TLS_CONNECT *conn)
 	digest_init(&conn->dgst_ctx, DIGEST_sm3());
 
 
-	if (conn->client_certs_len) {
-		//sm2_sign_init(&conn->sign_ctx, &conn->sign_key, SM2_DEFAULT_ID, SM2_DEFAULT_ID_LENGTH);
-	}
-
 	return 1;
 }
 
@@ -2378,9 +2374,6 @@ int tls_recv_server_key_exchange(TLS_CONNECT *conn)
 	}
 	// named_curve应该在supported_groups里面
 
-	//conn->ecdh_named_curve = named_curve;
-
-
 	conn->key_exchange_group = named_curve;
 	memcpy(conn->peer_key_exchange, point_octets, point_octets_len);
 	conn->peer_key_exchange_len = point_octets_len;
diff --git a/tools/tlcp_client.c b/tools/tlcp_client.c
index 9684f2a1..c3071ac2 100644
--- a/tools/tlcp_client.c
+++ b/tools/tlcp_client.c
@@ -329,7 +329,7 @@ bad:
 			perror("fopen");
 			goto end;
 		}
-		if (x509_certs_to_pem(conn.server_certs, conn.server_certs_len, certoutfp) != 1) {
+		if (x509_certs_to_pem(conn.peer_cert_chain, conn.peer_cert_chain_len, certoutfp) != 1) {
 			fprintf(stderr, "%s: x509_certs_to_pem error\n", prog);
 			fclose(certoutfp);
 			goto end;