diff --git a/blocks/block.c b/blocks/block.c
index 8dcdfcd..d2e4ec4 100644
--- a/blocks/block.c
+++ b/blocks/block.c
@@ -129,7 +129,7 @@ int ipfs_blocks_block_new(struct Block** block) {
 int ipfs_blocks_block_add_data(const unsigned char* data, size_t data_size, struct Block* block) {
 	// cid
 	unsigned char hash[32];
-	if (libp2p_crypto_hashing_sha256((char*)data, data_size, &hash[0]) == 0) {
+	if (libp2p_crypto_hashing_sha256(data, data_size, &hash[0]) == 0) {
 		return 0;
 	}
 
diff --git a/core/null.c b/core/null.c
index a8405f3..8888bd1 100644
--- a/core/null.c
+++ b/core/null.c
@@ -48,7 +48,7 @@ void *ipfs_null_connection (void *ptr)
 			if (ipfs_null_requesting_secio(results, bytes_read)) {
 				struct SecureSession secure_session;
 				secure_session.stream = stream;
-				if (!libp2p_secio_handshake(&secure_session, &connection_param->local_node->identity->private_key)) {
+				if (!libp2p_secio_handshake(&secure_session, &connection_param->local_node->identity->private_key, 1)) {
 					// rejecting connection
 					break;
 				}
diff --git a/merkledag/merkledag.c b/merkledag/merkledag.c
index 0f72837..fd2fdec 100644
--- a/merkledag/merkledag.c
+++ b/merkledag/merkledag.c
@@ -35,7 +35,7 @@ int ipfs_merkledag_add(struct Node* node, struct FSRepo* fs_repo, size_t* bytes_
 		if (node->hash == NULL) {
 			return 0;
 		}
-		if (libp2p_crypto_hashing_sha256((char*)protobuf, bytes_encoded, &node->hash[0]) == 0) {
+		if (libp2p_crypto_hashing_sha256(protobuf, bytes_encoded, &node->hash[0]) == 0) {
 			free(node->hash);
 			return 0;
 		}
diff --git a/test/cid/test_cid.h b/test/cid/test_cid.h
index abba40b..c2239c0 100644
--- a/test/cid/test_cid.h
+++ b/test/cid/test_cid.h
@@ -41,7 +41,7 @@ int test_cid_cast_multihash() {
 	unsigned char hashed[32];
 	memset(hashed, 0, 32);
 	// hash the string
-	libp2p_crypto_hashing_sha256(string_to_hash, strlen(string_to_hash), hashed);
+	libp2p_crypto_hashing_sha256((unsigned char*)string_to_hash, strlen(string_to_hash), hashed);
 	size_t multihash_size = mh_new_length(MH_H_SHA2_256, 32);
 	unsigned char multihash[multihash_size];
 	memset(multihash, 0, multihash_size);
@@ -75,7 +75,7 @@ int test_cid_cast_non_multihash() {
 	unsigned char hashed[32];
 	memset(hashed, 0, 32);
 	// hash the string
-	libp2p_crypto_hashing_sha256(string_to_hash, strlen(string_to_hash), hashed);
+	libp2p_crypto_hashing_sha256((unsigned char*)string_to_hash, strlen(string_to_hash), hashed);
 
 	// now make it a hash with a version and codec embedded in varints before the hash
 	size_t array_size = 34; // 32 for the hash, 2 for the 2 varints
diff --git a/unixfs/unixfs.c b/unixfs/unixfs.c
index 23d054f..7eb4d76 100644
--- a/unixfs/unixfs.c
+++ b/unixfs/unixfs.c
@@ -130,7 +130,7 @@ int ipfs_unixfs_add_data(unsigned char* data, size_t data_length, struct UnixFS*
 		free(unix_fs->bytes);
 		return 0;
 	}
-	if (libp2p_crypto_hashing_sha256((char*)data, data_length, &unix_fs->hash[0]) == 0) {
+	if (libp2p_crypto_hashing_sha256(data, data_length, &unix_fs->hash[0]) == 0) {
 		free(unix_fs->bytes);
 		free(unix_fs->hash);
 		return 0;