diff --git a/CMakeLists.txt b/CMakeLists.txt
index a59f5b6..9dcf447 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,4 +3,5 @@ cmake_minimum_required(VERSION 3.2)
 
 project(chiaki)
 
+add_subdirectory(lib)
 add_subdirectory(test)
\ No newline at end of file
diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
new file mode 100644
index 0000000..805508a
--- /dev/null
+++ b/lib/CMakeLists.txt
@@ -0,0 +1,19 @@
+
+set(HEADER_FILES
+		include/chiaki/session.h
+		include/chiaki/common.h
+		include/chiaki/thread.h
+		include/chiaki/base64.h)
+
+set(SOURCE_FILES
+		src/session.c
+		src/thread.c
+		src/base64.c)
+
+add_library(chiaki-lib ${HEADER_FILES} ${SOURCE_FILES})
+set_target_properties(chiaki-lib PROPERTIES OUTPUT_NAME chiaki)
+
+target_include_directories(chiaki-lib PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/include")
+
+find_package(Threads)
+target_link_libraries(chiaki-lib Threads::Threads)
diff --git a/lib/include/chiaki/base64.h b/lib/include/chiaki/base64.h
new file mode 100644
index 0000000..8b0933e
--- /dev/null
+++ b/lib/include/chiaki/base64.h
@@ -0,0 +1,37 @@
+/*
+ * This file is part of Chiaki.
+ *
+ * Chiaki is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Chiaki is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Chiaki.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef CHIAKI_BASE64_H
+#define CHIAKI_BASE64_H
+
+#include "common.h"
+
+#include <stdlib.h>
+#include <stdbool.h>
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+CHIAKI_EXPORT bool chiaki_base64_decode(const char *in, size_t in_size, uint8_t *out, size_t *out_size);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // CHIAKI_BASE64_H
diff --git a/lib/include/chiaki/common.h b/lib/include/chiaki/common.h
new file mode 100644
index 0000000..78e9a0c
--- /dev/null
+++ b/lib/include/chiaki/common.h
@@ -0,0 +1,31 @@
+/*
+ * This file is part of Chiaki.
+ *
+ * Chiaki is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Chiaki is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Chiaki.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef CHIAKI_COMMON_H
+#define CHIAKI_COMMON_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define CHIAKI_EXPORT
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // CHIAKI_COMMON_H
diff --git a/lib/include/chiaki/session.h b/lib/include/chiaki/session.h
new file mode 100644
index 0000000..f80edc3
--- /dev/null
+++ b/lib/include/chiaki/session.h
@@ -0,0 +1,62 @@
+/*
+ * This file is part of Chiaki.
+ *
+ * Chiaki is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Chiaki is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Chiaki.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef CHIAKI_SESSION_H
+#define CHIAKI_SESSION_H
+
+#include "common.h"
+#include "thread.h"
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct chiaki_connect_info_t
+{
+	const char *host;
+	const char *regist_key;
+	const char *ostype;
+	char auth[0x10];
+	uint8_t morning[0x10];
+} ChiakiConnectInfo;
+
+typedef struct chiaki_session_t
+{
+	struct
+	{
+		char *host;
+		char *regist_key;
+		char *ostype;
+		char auth[0x10];
+		uint8_t morning[0x10];
+	} connect_info;
+
+	ChiakiThread session_thread;
+} ChiakiSession;
+
+CHIAKI_EXPORT void chiaki_session_init(ChiakiSession *session, ChiakiConnectInfo *connect_info);
+CHIAKI_EXPORT void chiaki_session_fini(ChiakiSession *session);
+CHIAKI_EXPORT bool chiaki_session_start(ChiakiSession *session);
+CHIAKI_EXPORT void chiaki_session_join(ChiakiSession *session);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // CHIAKI_SESSION_H
diff --git a/lib/include/chiaki/thread.h b/lib/include/chiaki/thread.h
new file mode 100644
index 0000000..910973e
--- /dev/null
+++ b/lib/include/chiaki/thread.h
@@ -0,0 +1,45 @@
+/*
+ * This file is part of Chiaki.
+ *
+ * Chiaki is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Chiaki is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Chiaki.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef CHIAKI_THREAD_H
+#define CHIAKI_THREAD_H
+
+#include "common.h"
+
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <pthread.h>
+
+typedef struct chiaki_thread_t
+{
+	pthread_t thread;
+} ChiakiThread;
+
+typedef void *(*ChiakiThreadFunc)(void *);
+
+CHIAKI_EXPORT bool chiaki_thread_create(ChiakiThread *thread, ChiakiThreadFunc func, void *arg);
+CHIAKI_EXPORT bool chiaki_thread_join(ChiakiThread *thread, void **retval);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // CHIAKI_THREAD_H
diff --git a/lib/src/base64.c b/lib/src/base64.c
new file mode 100644
index 0000000..26187a7
--- /dev/null
+++ b/lib/src/base64.c
@@ -0,0 +1,95 @@
+/*
+ * This file is part of Chiaki.
+ *
+ * Chiaki is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Chiaki is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Chiaki.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <chiaki/base64.h>
+
+#include <stdint.h>
+
+// Implementation taken from
+// https://en.wikibooks.org/wiki/Algorithm_Implementation/Miscellaneous/Base64
+
+#define WHITESPACE 64
+#define EQUALS     65
+#define INVALID    66
+
+static const unsigned char d[] = {
+		66,66,66,66,66,66,66,66,66,66,64,66,66,66,66,66,66,66,66,66,66,66,66,66,66,
+		66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,62,66,66,66,63,52,53,
+		54,55,56,57,58,59,60,61,66,66,66,65,66,66,66, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
+		10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,66,66,66,66,66,66,26,27,28,
+		29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,66,66,
+		66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,
+		66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,
+		66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,
+		66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,
+		66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,
+		66,66,66,66,66,66
+};
+
+CHIAKI_EXPORT bool chiaki_base64_decode(const char *in, size_t in_size, uint8_t *out, size_t *out_size)
+{
+	const char *end = in + in_size;
+	char iter = 0;
+	uint32_t buf = 0;
+	size_t len = 0;
+
+	while (in < end)
+	{
+		unsigned char c = d[*in++];
+
+		switch(c)
+		{
+			case WHITESPACE:
+				continue;		// skip whitespace
+			case INVALID:
+				return false;   // invalid input
+			case EQUALS:		// pad character, end of data
+				in = end;
+				continue;
+			default:
+				buf = buf << 6 | c;
+				iter++; // increment the number of iteration
+				// If the buffer is full, split it into bytes
+				if(iter == 4)
+				{
+					if((len += 3) > *out_size)
+						return false; // buffer overflow
+					*(out++) = (unsigned char)((buf >> 16) & 0xff);
+					*(out++) = (unsigned char)((buf >> 8) & 0xff);
+					*(out++) = (unsigned char)(buf & 0xff);
+					buf = 0; iter = 0;
+				}
+		}
+	}
+
+	if(iter == 3)
+	{
+		if((len += 2) > *out_size)
+			return false; // buffer overflow
+		*(out++) = (unsigned char)((buf >> 10) & 0xff);
+		*(out++) = (unsigned char)((buf >> 2) & 0xff);
+	}
+	else if(iter == 2)
+	{
+		if(++len > *out_size)
+			return 1; // buffer overflow
+		*(out++) = (unsigned char)((buf >> 4) & 0xff);
+	}
+
+	*out_size = len;
+	return true;
+}
\ No newline at end of file
diff --git a/lib/src/session.c b/lib/src/session.c
new file mode 100644
index 0000000..57662e7
--- /dev/null
+++ b/lib/src/session.c
@@ -0,0 +1,73 @@
+/*
+ * This file is part of Chiaki.
+ *
+ * Chiaki is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Chiaki is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Chiaki.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <chiaki/session.h>
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+
+static const char session_request[] =
+	"GET /sce/rp/session HTTP/1.1\r\n"
+	"Host: 192.168.  1.  8:9295\r\n"
+	"User-Agent: remoteplay Windows\r\n"
+	"Connection: close\r\n"
+	"Content-Length: 0\r\n"
+	"RP-Registkey: 3131633065363864\r\n"
+	"Rp-Version: 8.0\r\n"
+	"\r\n";
+
+
+static void *session_thread_func(void *arg);
+
+
+CHIAKI_EXPORT void chiaki_session_init(ChiakiSession *session, ChiakiConnectInfo *connect_info)
+{
+	session->connect_info.host = strdup(connect_info->host);
+	session->connect_info.regist_key = strdup(connect_info->regist_key);
+	session->connect_info.ostype = strdup(connect_info->ostype);
+	memcpy(session->connect_info.auth, connect_info->auth, sizeof(session->connect_info.auth));
+	memcpy(session->connect_info.morning, connect_info->morning, sizeof(session->connect_info.morning));
+}
+
+CHIAKI_EXPORT void chiaki_session_fini(ChiakiSession *session)
+{
+	free(session->connect_info.host);
+	free(session->connect_info.regist_key);
+	free(session->connect_info.ostype);
+}
+
+CHIAKI_EXPORT bool chiaki_session_start(ChiakiSession *session)
+{
+	bool r = chiaki_thread_create(&session->session_thread, session_thread_func, session);
+	if(!r)
+		return false;
+	return true;
+}
+
+CHIAKI_EXPORT void chiaki_session_join(ChiakiSession *session)
+{
+	chiaki_thread_join(&session->session_thread, NULL);
+}
+
+static void *session_thread_func(void *arg)
+{
+	ChiakiSession *session = arg;
+	printf("Sleepy...\n");
+	return NULL;
+}
\ No newline at end of file
diff --git a/lib/src/thread.c b/lib/src/thread.c
new file mode 100644
index 0000000..256be43
--- /dev/null
+++ b/lib/src/thread.c
@@ -0,0 +1,43 @@
+/*
+ * This file is part of Chiaki.
+ *
+ * Chiaki is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Chiaki is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Chiaki.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <chiaki/thread.h>
+
+#include <stdio.h>
+
+
+CHIAKI_EXPORT bool chiaki_thread_create(ChiakiThread *thread, ChiakiThreadFunc func, void *arg)
+{
+	int r = pthread_create(&thread->thread, NULL, func, arg);
+	if(r != 0)
+	{
+		perror("pthread_create");
+		return false;
+	}
+	return true;
+}
+
+CHIAKI_EXPORT bool chiaki_thread_join(ChiakiThread *thread, void **retval)
+{
+	int r = pthread_join(thread->thread, retval);
+	if(r != 0)
+	{
+		perror("pthread_join");
+		return false;
+	}
+	return true;
+}
\ No newline at end of file
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 12ce2c8..6c42fb5 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -1,3 +1,5 @@
 
 add_executable(chiaki-test
-		main.c)
\ No newline at end of file
+		main.c)
+
+target_link_libraries(chiaki-test chiaki-lib)
\ No newline at end of file
diff --git a/test/main.c b/test/main.c
index 8a2f829..cee38eb 100644
--- a/test/main.c
+++ b/test/main.c
@@ -1,8 +1,42 @@
 
+#include <chiaki/session.h>
+#include <chiaki/base64.h>
+
 #include <stdio.h>
+#include <string.h>
 
-int main()
+int main(int argc, const char *argv[])
 {
-	printf("Sleepy...\n");
+	if(argc != 6)
+	{
+		printf("Usage: %s <host> <registkey> <ostype> <auth> <morning (base64)>\n", argv[0]);
+		return 1;
+	}
+
+	ChiakiConnectInfo connect_info;
+	connect_info.host = argv[1];
+	connect_info.regist_key = argv[2];
+	connect_info.ostype = argv[3];
+
+	size_t auth_len = strlen(argv[4]);
+	if(auth_len > sizeof(connect_info.auth))
+		auth_len = sizeof(connect_info.auth);
+	memcpy(connect_info.auth, argv[4], auth_len);
+	if(auth_len < sizeof(connect_info.auth))
+		memset(connect_info.auth + auth_len, 0, sizeof(connect_info.auth) - auth_len);
+
+	size_t morning_size = sizeof(connect_info.morning);
+	bool r = chiaki_base64_decode(argv[5], strlen(argv[5]), connect_info.morning, &morning_size);
+	if(!r || morning_size != sizeof(connect_info.morning))
+	{
+		printf("morning invalid.\n");
+		return 1;
+	}
+
+	ChiakiSession session;
+	chiaki_session_init(&session, &connect_info);
+	chiaki_session_start(&session);
+	chiaki_session_join(&session);
+	chiaki_session_fini(&session);
 	return 0;
 }
\ No newline at end of file