diff --git a/src/factory/KafkaTaskImpl.cc b/src/factory/KafkaTaskImpl.cc
index 626619cb..84926706 100644
--- a/src/factory/KafkaTaskImpl.cc
+++ b/src/factory/KafkaTaskImpl.cc
@@ -158,11 +158,7 @@ CommMessageOut *__ComplexKafkaTask::message_out()
 		{
 			KafkaConnectionInfo *conn_info = new KafkaConnectionInfo;
 			if (!conn_info->init(sasl_mechanisms))
-			{
-				this->state = WFT_STATE_TASK_ERROR;
-				this->error = WFT_ERR_KAFKA_SASL_DISALLOWED;
 				return NULL;
-			}
 
 			auto&& deleter = [] (void *ctx)
 				{
diff --git a/src/protocol/KafkaMessage.cc b/src/protocol/KafkaMessage.cc
index da6c98f3..2dbbe9b1 100644
--- a/src/protocol/KafkaMessage.cc
+++ b/src/protocol/KafkaMessage.cc
@@ -3785,23 +3785,26 @@ int KafkaResponse::parse_saslauthenticate(void **buf, size_t *size)
 
 int KafkaResponse::handle_sasl_continue()
 {
+	struct iovec iovecs[64];
 	int ret;
-	std::vector<struct iovec> iovecs(2);
-	if (this->encode(iovecs.data(), 2) >= 0)
+	int cnt = this->encode(iovecs, 64);
+	if ((unsigned int)cnt > 64)
 	{
-		for (auto vec : iovecs)
+		if (cnt > 64)
+			errno = EOVERFLOW;
+		return -1;
+	}
+
+	for (int i = 0; i < cnt; i++)
+	{
+		ret = this->feedback(iovecs[i].iov_base, iovecs[i].iov_len);
+		if (ret != (int)iovecs[i].iov_len)
 		{
-			ret = this->feedback(vec.iov_base, vec.iov_len);
-			if (ret != (int)vec.iov_len)
-			{
-				if (ret > 0)
-					errno = EAGAIN;
-				return -1;
-			}
+			if (ret > 0)
+				errno = EAGAIN;
+			return -1;
 		}
 	}
-	else
-		return -1;
 
 	return 0;
 }
diff --git a/src/protocol/kafka_parser.c b/src/protocol/kafka_parser.c
index d13e261e..70cf1621 100644
--- a/src/protocol/kafka_parser.c
+++ b/src/protocol/kafka_parser.c
@@ -17,6 +17,8 @@
 */
 
 #include <openssl/sha.h>
+#include <openssl/hmac.h>
+#include <openssl/evp.h>
 #include <arpa/inet.h>
 #include <string.h>
 #include <stdlib.h>
@@ -947,11 +949,12 @@ static int scram_build_client_final_message(kafka_scram_t *scram, int itcnt,
 	char *server_sign_b64, *client_proof_b64 = NULL;
 	int i;
 
-	if (scram_hi(scram->evp, itcnt, &password_iov, salt, &salted_pwd_iov) == -1)
+	if (scram_hi((const EVP_MD *)scram->evp, itcnt, &password_iov, salt,
+				 &salted_pwd_iov) == -1)
 		return -1;
 
-	if (scram_hmac(scram->evp, &salted_pwd_iov, &client_key_verbatim_iov,
-				   &client_key_iov) == -1)
+	if (scram_hmac((const EVP_MD *)scram->evp, &salted_pwd_iov,
+				   &client_key_verbatim_iov, &client_key_iov) == -1)
 		return -1;
 
 	scram_h(scram, &client_key_iov, &stored_key_iov);
@@ -973,15 +976,15 @@ static int scram_build_client_final_message(kafka_scram_t *scram, int itcnt,
 				 (int)client_final_msg_wo_proof_iov.iov_len,
 				 (char *)client_final_msg_wo_proof_iov.iov_base);
 
-		if (scram_hmac(scram->evp, &salted_pwd_iov, &server_key_verbatim_iov,
-					   &server_key_iov) == 0 &&
-			scram_hmac(scram->evp, &server_key_iov, &auth_message_iov,
-					   &server_sign_iov) == 0)
+		if (scram_hmac((const EVP_MD *)scram->evp, &salted_pwd_iov,
+					   &server_key_verbatim_iov, &server_key_iov) == 0 &&
+			scram_hmac((const EVP_MD *)scram->evp, &server_key_iov,
+					   &auth_message_iov, &server_sign_iov) == 0)
 		{
 			server_sign_b64 = scram_base64_encode(&server_sign_iov);
 			if (server_sign_b64 &&
-				scram_hmac(scram->evp, &stored_key_iov, &auth_message_iov,
-						   &client_sign_iov) ==0 &&
+				scram_hmac((const EVP_MD *)scram->evp, &stored_key_iov,
+						   &auth_message_iov, &client_sign_iov) ==0 &&
 				client_key_iov.iov_len == client_sign_iov.iov_len)
 			{
 				scram->server_signature_b64.iov_base = server_sign_b64;
diff --git a/src/protocol/kafka_parser.h b/src/protocol/kafka_parser.h
index 52d7ec74..52f9cab4 100644
--- a/src/protocol/kafka_parser.h
+++ b/src/protocol/kafka_parser.h
@@ -22,9 +22,6 @@
 #include <arpa/inet.h>
 #include <stddef.h>
 #include <stdint.h>
-#include <openssl/hmac.h>
-#include <openssl/evp.h>
-#include <openssl/sha.h>
 #include "list.h"
 
 enum
@@ -224,7 +221,7 @@ typedef struct __kafka_parser
 
 typedef struct __kafka_scram
 {
-	const EVP_MD *evp;
+	const void *evp;
 	unsigned char *(*scram_h)(const unsigned char *d, size_t n,
 							  unsigned char *md);
 	size_t scram_h_size;