diff --git a/lab04-06_AES_PC/aes.cpp b/lab04-06_AES_PC/aes.cpp
new file mode 100644
index 0000000..1864ead
--- /dev/null
+++ b/lab04-06_AES_PC/aes.cpp
@@ -0,0 +1,402 @@
+#include <stdio.h>
+#include <stdint.h>
+
+/* AES-128 simple implementation template and testing */
+
+/*
+Author: Ondrej Hladuvka, hladuond@fit.cvut.cz
+Template: Jiri Bucek 2017
+AES specification:
+http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf
+*/
+
+/* AES Constants */
+
+// forward sbox
+const uint8_t SBOX[256] = {
+    // 0     1    2      3     4    5     6     7      8    9     A      B    C     D     E     F
+    0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,  // 0
+    0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,  // 1
+    0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,  // 2
+    0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,  // 3
+    0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,  // 4
+    0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,  // 5
+    0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,  // 6
+    0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,  // 7
+    0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,  // 8
+    0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,  // 9
+    0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,  // A
+    0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,  // B
+    0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,  // C
+    0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,  // D
+    0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,  // E
+    0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16   // F
+};
+
+const uint8_t rCon[12] = {
+	0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36,
+};
+
+/* AES state type */
+typedef uint32_t t_state[4];
+
+/* Helper functions */
+void hexprint16(uint8_t *p) {
+	for (int i = 0; i < 16; i++)
+		printf("%02hhx ", p[i]);
+	puts("");
+}
+
+void hexprintw(uint32_t w) {
+	for (int i = 0; i < 32; i += 8)
+		printf("%02hhx ", (w >> i) & 0xffU);
+}
+
+void hexprintws(uint32_t * p, int cnt) {
+	for (int i = 0; i < cnt; i++)
+		hexprintw(p[i]);
+	puts("");
+}
+void printstate(t_state s) {
+	hexprintw(s[0]);
+	hexprintw(s[1]);
+	hexprintw(s[2]);
+	hexprintw(s[3]);
+	puts("");
+}
+
+uint32_t word(uint8_t a0, uint8_t a1, uint8_t a2, uint8_t a3) {
+	return a0 | (uint32_t)a1 << 8 | (uint32_t)a2 << 16 | (uint32_t)a3 << 24;
+}
+
+uint8_t wbyte(uint32_t w, int pos) {
+	return (w >> (pos * 8)) & 0xff;
+}
+
+// **************** AES  functions ****************
+uint32_t subWord(uint32_t w) {
+	return word(SBOX[wbyte(w, 0)], SBOX[wbyte(w, 1)], SBOX[wbyte(w, 2)], SBOX[wbyte(w, 3)]);
+}
+
+void subBytes(t_state s) {
+	unsigned char* p = reinterpret_cast<unsigned char*>(s);
+	for (int i = 0; i < 16; ++i)
+		p[i] = SBOX[p[i]];
+}
+
+void shiftRows(t_state s) {
+    uint32_t tmp[4];
+
+	tmp[0] = s[0] & 0x0000FF00;
+	tmp[1] = s[1] & 0x0000FF00; 
+	tmp[2] = s[2] & 0x0000FF00; 
+	tmp[3] = s[3] & 0x0000FF00;
+
+    s[0] = (s[0] & 0xFFFF00FF) | tmp[1];
+    s[1] = (s[1] & 0xFFFF00FF) | tmp[2];
+    s[2] = (s[2] & 0xFFFF00FF) | tmp[3];
+    s[3] = (s[3] & 0xFFFF00FF) | tmp[0];
+
+	tmp[0] = s[0] & 0x00FF0000;
+	tmp[1] = s[1] & 0x00FF0000; 
+	tmp[2] = s[2] & 0x00FF0000; 
+	tmp[3] = s[3] & 0x00FF0000;
+
+    s[0] = (s[0] & 0xFF00FFFF) | tmp[2];
+    s[1] = (s[1] & 0xFF00FFFF) | tmp[3];
+    s[2] = (s[2] & 0xFF00FFFF) | tmp[0];
+    s[3] = (s[3] & 0xFF00FFFF) | tmp[1];
+
+	tmp[0] = s[0] & 0xFF000000;
+	tmp[1] = s[1] & 0xFF000000; 
+	tmp[2] = s[2] & 0xFF000000; 
+	tmp[3] = s[3] & 0xFF000000;
+
+    s[0] = (s[0] & 0x00FFFFFF) | tmp[3];
+    s[1] = (s[1] & 0x00FFFFFF) | tmp[0];
+    s[2] = (s[2] & 0x00FFFFFF) | tmp[1];
+    s[3] = (s[3] & 0x00FFFFFF) | tmp[2];
+}
+
+uint8_t xtime(uint8_t c) {
+    uint8_t m = ((c & 0x80) >> 7) * 0x1B;
+    return (c << 1) ^ m;
+}
+
+void mixColumns(t_state s) {
+    for (int i = 0; i < 4; i++) {
+        uint8_t a0 = wbyte(s[i], 0);
+        uint8_t a1 = wbyte(s[i], 1);
+        uint8_t a2 = wbyte(s[i], 2);
+        uint8_t a3 = wbyte(s[i], 3);
+
+        uint8_t r0 = xtime(a0) ^ xtime(a1) ^ a1 ^ a2 ^ a3;
+        uint8_t r1 = xtime(a1) ^ xtime(a2) ^ a2 ^ a3 ^ a0;
+        uint8_t r2 = xtime(a2) ^ xtime(a3) ^ a3 ^ a0 ^ a1;
+        uint8_t r3 = xtime(a3) ^ xtime(a0) ^ a0 ^ a1 ^ a2;
+
+        s[i] = word(r0, r1, r2, r3);
+    }
+}
+
+/*
+* Key expansion from 128bits (4*32b)
+* to 11 round keys (11*4*32b)
+* each round key is 4*32b
+*/
+void expandKey(uint8_t k[16], uint32_t ek[44]) {
+    for (int i = 0; i < 4; i++) {
+        ek[i] = word(k[4*i], k[4*i + 1], k[4*i + 2], k[4*i + 3]);
+    }
+
+    for (int i = 4; i < 44; i++) {
+        uint32_t temp = ek[i - 1];
+        if (i % 4 == 0) {
+            // RotWord, SubWord, and XOR with Rcon
+            temp = subWord((temp >> 8) | (temp << 24)) ^ rCon[i / 4];
+        }
+        ek[i] = ek[i - 4] ^ temp;
+    }
+}
+
+
+/* Adding expanded round key (prepared before) */
+void addRoundKey(t_state s, uint32_t ek[], short index) {
+    for (int i = 0; i < 4; i++) {
+        s[i] ^= ek[index + i];
+    }
+}
+
+void aes128(uint8_t *in, uint8_t *out, uint32_t * expKey)
+{
+
+	t_state state;
+
+	state[0] = word(in[0],  in[1],  in[2],  in[3]);
+    state[1] = word(in[4],  in[5],  in[6],  in[7]);
+    state[2] = word(in[8],  in[9],  in[10], in[11]);
+    state[3] = word(in[12], in[13], in[14], in[15]);
+	
+	printf("IN:  ");
+	printstate(state);
+
+	for (int i = 0; i < 11; i++) {
+		printf("K%02d: ", i);
+		hexprintws(expKey + 4 * i, 4);
+	}
+
+	addRoundKey(state, expKey, 0);
+	for (int round = 0; round < 9; ++round) {
+		printf("round: %d\n", round);
+		subBytes(state);
+		shiftRows(state);
+		mixColumns(state);
+		addRoundKey(state, expKey, round * 4 + 4);
+	}
+
+	subBytes(state);
+	shiftRows(state);
+	addRoundKey(state, expKey, 10 * 4);
+	
+	out[0]  = wbyte(state[0], 0);
+	out[1]  = wbyte(state[0], 1);
+	out[2]  = wbyte(state[0], 2);
+	out[3]  = wbyte(state[0], 3);
+
+	out[4]  = wbyte(state[1], 0);
+	out[5]  = wbyte(state[1], 1);
+	out[6]  = wbyte(state[1], 2);
+	out[7]  = wbyte(state[1], 3);
+
+	out[8]  = wbyte(state[2], 0);
+	out[9]  = wbyte(state[2], 1);
+	out[10] = wbyte(state[2], 2);
+	out[11] = wbyte(state[2], 3);
+
+	out[12] = wbyte(state[3], 0);
+	out[13] = wbyte(state[3], 1);
+	out[14] = wbyte(state[3], 2);
+	out[15] = wbyte(state[3], 3);
+
+}
+
+//****************************
+// MAIN function: AES testing
+//****************************
+int main(int argc, char* argv[])
+{
+	int test_failed = 0;
+	// test subBytes
+	printf("Testing subBytes\n");
+	{
+		t_state state = {     0x01234567, 
+		                      0x89abcdef, 
+						      0xdeadbeef, 
+						      0x00112233 };
+
+		t_state res_state = { 0x7c266e85, 
+		                      0xa762bddf,
+							  0x1d95aedf,
+							  0x638293c3 };
+		subBytes(state);
+		// printf("0x%08x, 0x%08x, 0x%08x, 0x%08x\n", state[0], state[1], state[2], state[3]);
+		for (int i = 0; i < 4; i++) {
+			if (state[i] != res_state[i]) { printf("Mismatch at state[%d]!\n", i); test_failed = 1; }
+		}
+	}
+	// test shiftRows
+	printf("Testing shiftRows\n");
+
+	{
+		t_state state = {     0x01234567, 
+		                      0x89abcdef,
+							  0xdeadbeef,
+							  0x00112233 };
+
+		t_state res_state = { 0x00adcd67,
+		                      0x0111beef,
+							  0x892322ef,
+							  0xdeab4533 };
+		shiftRows(state);
+		// printf("0x%08x, 0x%08x, 0x%08x, 0x%08x\n", state[0], state[1], state[2], state[3]);
+		for (int i = 0; i < 4; i++) {
+			if (state[i] != res_state[i]) { printf("Mismatch at state[%d]! 0x%08x 0x%08x\n", i, res_state[i], state[i]); test_failed = 1; }
+		}
+	}
+	// test xtime
+	printf("Testing xtime\n");
+	{
+		uint8_t res[256] = { 0x00, 0x02, 0x04, 0x06, 0x08, 0x0a, 0x0c, 0x0e, 0x10, 0x12,
+			0x14, 0x16, 0x18, 0x1a, 0x1c, 0x1e, 0x20, 0x22, 0x24, 0x26,
+			0x28, 0x2a, 0x2c, 0x2e, 0x30, 0x32, 0x34, 0x36, 0x38, 0x3a,
+			0x3c, 0x3e, 0x40, 0x42, 0x44, 0x46, 0x48, 0x4a, 0x4c, 0x4e,
+			0x50, 0x52, 0x54, 0x56, 0x58, 0x5a, 0x5c, 0x5e, 0x60, 0x62,
+			0x64, 0x66, 0x68, 0x6a, 0x6c, 0x6e, 0x70, 0x72, 0x74, 0x76,
+			0x78, 0x7a, 0x7c, 0x7e, 0x80, 0x82, 0x84, 0x86, 0x88, 0x8a,
+			0x8c, 0x8e, 0x90, 0x92, 0x94, 0x96, 0x98, 0x9a, 0x9c, 0x9e,
+			0xa0, 0xa2, 0xa4, 0xa6, 0xa8, 0xaa, 0xac, 0xae, 0xb0, 0xb2,
+			0xb4, 0xb6, 0xb8, 0xba, 0xbc, 0xbe, 0xc0, 0xc2, 0xc4, 0xc6,
+			0xc8, 0xca, 0xcc, 0xce, 0xd0, 0xd2, 0xd4, 0xd6, 0xd8, 0xda,
+			0xdc, 0xde, 0xe0, 0xe2, 0xe4, 0xe6, 0xe8, 0xea, 0xec, 0xee,
+			0xf0, 0xf2, 0xf4, 0xf6, 0xf8, 0xfa, 0xfc, 0xfe, 0x1b, 0x19,
+			0x1f, 0x1d, 0x13, 0x11, 0x17, 0x15, 0x0b, 0x09, 0x0f, 0x0d,
+			0x03, 0x01, 0x07, 0x05, 0x3b, 0x39, 0x3f, 0x3d, 0x33, 0x31,
+			0x37, 0x35, 0x2b, 0x29, 0x2f, 0x2d, 0x23, 0x21, 0x27, 0x25,
+			0x5b, 0x59, 0x5f, 0x5d, 0x53, 0x51, 0x57, 0x55, 0x4b, 0x49,
+			0x4f, 0x4d, 0x43, 0x41, 0x47, 0x45, 0x7b, 0x79, 0x7f, 0x7d,
+			0x73, 0x71, 0x77, 0x75, 0x6b, 0x69, 0x6f, 0x6d, 0x63, 0x61,
+			0x67, 0x65, 0x9b, 0x99, 0x9f, 0x9d, 0x93, 0x91, 0x97, 0x95,
+			0x8b, 0x89, 0x8f, 0x8d, 0x83, 0x81, 0x87, 0x85, 0xbb, 0xb9,
+			0xbf, 0xbd, 0xb3, 0xb1, 0xb7, 0xb5, 0xab, 0xa9, 0xaf, 0xad,
+			0xa3, 0xa1, 0xa7, 0xa5, 0xdb, 0xd9, 0xdf, 0xdd, 0xd3, 0xd1,
+			0xd7, 0xd5, 0xcb, 0xc9, 0xcf, 0xcd, 0xc3, 0xc1, 0xc7, 0xc5,
+			0xfb, 0xf9, 0xff, 0xfd, 0xf3, 0xf1, 0xf7, 0xf5, 0xeb, 0xe9,
+			0xef, 0xed, 0xe3, 0xe1, 0xe7, 0xe5 };
+		for (uint16_t i = 0; i < 256; i++) {
+			//printf("0x%02hhx,   ", xtime((uint8_t)i));
+			if (xtime((uint8_t)i)!=res[i]) { 
+				printf("\nMismatch at xtime(0x%02x)! Comparison interrupted.\n", i);  test_failed = 1;
+				break;
+			}
+		}
+		// puts("");
+	}
+	// test mixColumns
+	printf("Testing mixColumns\n");
+	{
+		t_state state = {     0x01234567, 
+		                      0x89abcdef, 
+							  0xdeadbeef, 
+							  0x00112233 };
+
+		t_state res_state = { 0xcd678923, 
+		                      0x45ef01ab, 
+							  0x9e69ba6f, 
+							  0x66334411 };
+		mixColumns(state);
+		// printf("0x%08x, 0x%08x, 0x%08x, 0x%08x\n", state[0], state[1], state[2], state[3]);
+		// printf("0x%08x, 0x%08x, 0x%08x, 0x%08x\n", res_state[0], res_state[1], res_state[2], res_state[3]);
+		for (int i = 0; i < 4; i++) {
+			if (state[i] != res_state[i]) { printf("Mismatch at state[%d]! 0x%08x\n", i, state[i]); test_failed = 1; }
+		}
+	}
+
+	// test key expansion
+	printf("Testing expandKey\n");
+	{
+		uint8_t key_b[16] = { 0xef, 0xbe, 0xad, 0xde, 0xbe, 0xba, 0xfe, 0xca, 0x0D, 0xF0, 0xAD, 0xBA, 0x00, 0x11, 0x22, 0x33 };
+		uint32_t key_w[44] = {  0 /*, ...*/ };
+		uint32_t res_key_w[44] = {
+			0xdeadbeef, 0xcafebabe, 0xbaadf00d, 0x33221100,
+			0xbd6e2d6c, 0x779097d2, 0xcd3d67df, 0xfe1f76df,
+			0x23d5ed56, 0x54457a84, 0x99781d5b, 0x67676b84,
+			0x7c50682d, 0x281512a9, 0xb16d0ff2, 0xd60a6476,
+			0x44a60f66, 0x6cb31dcf, 0xddde123d, 0x0bd4764b,
+			0xf78d474e, 0x9b3e5a81, 0x46e048bc, 0x4d343ef7,
+			0x9f6e5fdc, 0x0450055d, 0x42b04de1, 0x0f847316,
+			0xd8180013, 0xdc48054e, 0x9ef848af, 0x917c3bb9,
+			0x8e991071, 0x52d1153f, 0xcc295d90, 0x5d556629,
+			0x2bd5ec59, 0x7904f966, 0xb52da4f6, 0xe878c2df,
+			0xb54e504a, 0xcc4aa92c, 0x79670dda, 0x911fcf05, 
+		};
+		expandKey(key_b, key_w);
+		for (int i = 0; i < 44; i++) {
+			// printf("0x%08x, ", key_w[i]);
+			// if (i % 4 == 3) printf("\n");
+		}
+
+		for (int i = 0; i < 44; i++) {
+			if (key_w[i] != res_key_w[i]) { 
+				printf("Mismatch at key_w[%d]! Comparison interrupted.\n", i);  test_failed = 1;
+				break;
+			}
+		}
+		printf("Testing addRoundKey\n");
+		// test  AddRoundKey (last round)
+		t_state state = { 0x01234567, 0x89abcdef, 0xdeadbeef, 0x00112233 };
+		t_state res_state = { 0xb46d152d, 0x45e164c3, 0xa7cab335, 0x910eed36 };
+		addRoundKey(state, key_w, 40);
+		printf("0x%08x, 0x%08x, 0x%08x, 0x%08x\n", state[0], state[1], state[2], state[3]);
+		for (int i = 0; i < 4; i++) {
+			if (state[i] != res_state[i]) { printf("Mismatch at state[%d]!\n", i); }
+		}
+
+	}
+
+	// test aes encryption
+	printf("Testing aes\n");
+	{
+		uint8_t key[16] = { 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff };
+		uint8_t in[16]  = { 0xab, 0xcd, 0xef, 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0x01, 0x23, 0x45, 0x67, 0x89 };
+		uint8_t out[16] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+		uint8_t res[16] = { 0xa3, 0x3a, 0xca, 0x68, 0x72, 0xa2, 0x27, 0x74, 0xbf, 0x99, 0xf3, 0x71, 0xaa, 0x99, 0xd2, 0x5a };
+
+		printf("Key: ");
+		hexprint16(key);
+		puts("");
+		printf("In:  ");
+		hexprint16(in);
+		puts("");
+
+		uint32_t expKey[11 * 4];
+		expandKey(key, expKey);
+		
+		aes128(in, out, expKey);
+
+		printf("Out: ");
+		hexprint16(out);
+		puts("");
+
+		for (int i = 0; i < 16; i++) {
+			if (out[i] != res[i]) { printf("Mismatch at out[%02d]! 0x%02x 0x%02x\n", i, out[i], res[i]); test_failed = 1; }
+		}
+	}
+	if (test_failed) {
+		printf("|*********** SOME TEST(S) FAILED ***********|\n");
+		printf("Please fix me!\n");
+	}
+	else {
+		printf("============== All tests OK! ===============\n");
+	}
+	return  test_failed;
+}
diff --git a/lab04-06_AES_PC/aestest.cpp b/lab04-06_AES_PC/aestest.cpp
new file mode 100644
index 0000000..5d88123
--- /dev/null
+++ b/lab04-06_AES_PC/aestest.cpp
@@ -0,0 +1,413 @@
+#include <stdio.h>
+#include <stdint.h>
+
+/* AES-128 simple implementation template and testing */
+
+/*
+Author: Ondrej Hladuvka, hladuond@fit.cvut.cz
+Template: Jiri Bucek 2017
+AES specification:
+http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf
+*/
+
+/* AES Constants */
+
+// forward sbox
+const uint8_t SBOX[256] = {
+    // 0     1    2      3     4    5     6     7      8    9     A      B    C     D     E     F
+    0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,  // 0
+    0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,  // 1
+    0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,  // 2
+    0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,  // 3
+    0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,  // 4
+    0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,  // 5
+    0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,  // 6
+    0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,  // 7
+    0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,  // 8
+    0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,  // 9
+    0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,  // A
+    0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,  // B
+    0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,  // C
+    0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,  // D
+    0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,  // E
+    0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16   // F
+};
+
+const uint8_t rCon[12] = {
+	0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36,
+};
+
+/* AES state type */
+typedef uint32_t t_state[4];
+
+/* Helper functions */
+void hexprint16(uint8_t *p) {
+	for (int i = 0; i < 16; i++)
+		printf("%02hhx ", p[i]);
+	puts("");
+}
+
+void hexprintw(uint32_t w) {
+	for (int i = 0; i < 32; i += 8)
+		printf("%02hhx ", (w >> i) & 0xffU);
+}
+
+void hexprintws(uint32_t * p, int cnt) {
+	for (int i = 0; i < cnt; i++)
+		hexprintw(p[i]);
+	puts("");
+}
+void printstate(t_state s) {
+	hexprintw(s[0]);
+	hexprintw(s[1]);
+	hexprintw(s[2]);
+	hexprintw(s[3]);
+	puts("");
+}
+
+uint32_t word(uint8_t a0, uint8_t a1, uint8_t a2, uint8_t a3) {
+	return a0 | (uint32_t)a1 << 8 | (uint32_t)a2 << 16 | (uint32_t)a3 << 24;
+}
+
+uint8_t wbyte(uint32_t w, int pos) {
+	return (w >> (pos * 8)) & 0xff;
+}
+
+// **************** AES  functions ****************
+uint32_t subWord(uint32_t w) {
+	return word(SBOX[wbyte(w, 0)], SBOX[wbyte(w, 1)], SBOX[wbyte(w, 2)], SBOX[wbyte(w, 3)]);
+}
+
+void subBytes(t_state s) {
+	unsigned char* p = reinterpret_cast<unsigned char*>(s);
+	for (int i = 0; i < 16; ++i)
+		p[i] = SBOX[p[i]];
+}
+
+void shiftRows(t_state s) {
+    uint32_t tmp[4];
+
+	tmp[0] = s[0] & 0x0000FF00;
+	tmp[1] = s[1] & 0x0000FF00; 
+	tmp[2] = s[2] & 0x0000FF00; 
+	tmp[3] = s[3] & 0x0000FF00;
+
+    s[0] = (s[0] & 0xFFFF00FF) | tmp[1];
+    s[1] = (s[1] & 0xFFFF00FF) | tmp[2];
+    s[2] = (s[2] & 0xFFFF00FF) | tmp[3];
+    s[3] = (s[3] & 0xFFFF00FF) | tmp[0];
+
+	tmp[0] = s[0] & 0x00FF0000;
+	tmp[1] = s[1] & 0x00FF0000; 
+	tmp[2] = s[2] & 0x00FF0000; 
+	tmp[3] = s[3] & 0x00FF0000;
+
+    s[0] = (s[0] & 0xFF00FFFF) | tmp[2];
+    s[1] = (s[1] & 0xFF00FFFF) | tmp[3];
+    s[2] = (s[2] & 0xFF00FFFF) | tmp[0];
+    s[3] = (s[3] & 0xFF00FFFF) | tmp[1];
+
+	tmp[0] = s[0] & 0xFF000000;
+	tmp[1] = s[1] & 0xFF000000; 
+	tmp[2] = s[2] & 0xFF000000; 
+	tmp[3] = s[3] & 0xFF000000;
+
+    s[0] = (s[0] & 0x00FFFFFF) | tmp[3];
+    s[1] = (s[1] & 0x00FFFFFF) | tmp[0];
+    s[2] = (s[2] & 0x00FFFFFF) | tmp[1];
+    s[3] = (s[3] & 0x00FFFFFF) | tmp[2];
+}
+
+uint8_t xtime(uint8_t c) {
+    uint8_t m = ((c & 0x80) >> 7) * 0x1B;
+    return (c << 1) ^ m;
+}
+
+void mixColumns(t_state s) {
+    for (int i = 0; i < 4; i++) {
+        uint8_t a0 = wbyte(s[i], 0);
+        uint8_t a1 = wbyte(s[i], 1);
+        uint8_t a2 = wbyte(s[i], 2);
+        uint8_t a3 = wbyte(s[i], 3);
+
+        uint8_t r0 = xtime(a0) ^ xtime(a1) ^ a1 ^ a2 ^ a3;
+        uint8_t r1 = xtime(a1) ^ xtime(a2) ^ a2 ^ a3 ^ a0;
+        uint8_t r2 = xtime(a2) ^ xtime(a3) ^ a3 ^ a0 ^ a1;
+        uint8_t r3 = xtime(a3) ^ xtime(a0) ^ a0 ^ a1 ^ a2;
+
+        s[i] = word(r0, r1, r2, r3);
+    }
+}
+
+/*
+* Key expansion from 128bits (4*32b)
+* to 11 round keys (11*4*32b)
+* each round key is 4*32b
+*/
+void expandKey(uint8_t k[16], uint32_t ek[44]) {
+    for (int i = 0; i < 4; i++) {
+        ek[i] = word(k[4*i], k[4*i + 1], k[4*i + 2], k[4*i + 3]);
+    }
+
+    for (int i = 4; i < 44; i++) {
+        uint32_t temp = ek[i - 1];
+        if (i % 4 == 0) {
+            // RotWord, SubWord, and XOR with Rcon
+            temp = subWord((temp >> 8) | (temp << 24)) ^ rCon[i / 4];
+        }
+        ek[i] = ek[i - 4] ^ temp;
+    }
+}
+
+
+/* Adding expanded round key (prepared before) */
+void addRoundKey(t_state s, uint32_t ek[], short index) {
+    for (int i = 0; i < 4; i++) {
+        s[i] ^= ek[index + i];
+    }
+}
+
+void aes128(uint8_t *in, uint8_t *out, uint32_t * expKey)
+{
+
+	t_state state;
+
+	state[0] = word(in[0],  in[4],  in[7],  in[11]);  // Big-endian conversion
+    state[1] = word(in[1],  in[5],  in[8],  in[12]);
+    state[2] = word(in[2], in[6], in[9],  in[13]);
+    state[3] = word(in[3], in[7], in[10], in[14]);
+	// for (int i = 0; i < 4; ++i) {
+	// 	for (int j = 0; j < 4; ++j) {
+	// 		state
+	// 	}
+	// }
+	
+	printf("IN:  ");
+	printstate(state);
+
+	for (int i = 0; i < 11; i++) {
+		printf("K%02d: ", i);
+		hexprintws(expKey + 4 * i, 4);
+	}
+
+	addRoundKey(state, expKey, 0);
+	for (int round = 0; round < 9; ++round) {
+		printf("round: %d\n", round);
+		subBytes(state);
+		shiftRows(state);
+		mixColumns(state);
+		addRoundKey(state, expKey, round * 4);
+	}
+
+	subBytes(state);
+	shiftRows(state);
+	addRoundKey(state, expKey, 10 * 4);
+	
+	out[0]  = wbyte(state[0], 3);
+    out[1]  = wbyte(state[0], 2);
+    out[2]  = wbyte(state[0], 1);
+    out[3]  = wbyte(state[0], 0);
+
+    out[4]  = wbyte(state[1], 3);
+    out[5]  = wbyte(state[1], 2);
+    out[6]  = wbyte(state[1], 1);
+    out[7]  = wbyte(state[1], 0);
+
+    out[8]  = wbyte(state[2], 3);
+    out[9]  = wbyte(state[2], 2);
+    out[10] = wbyte(state[2], 1);
+    out[11] = wbyte(state[2], 0);
+
+    out[12] = wbyte(state[3], 3);
+    out[13] = wbyte(state[3], 2);
+    out[14] = wbyte(state[3], 1);
+    out[15] = wbyte(state[3], 0);
+
+	for (int i = 0; i < 16; i++) {
+		if (i < 4) out[i] = wbyte(state[0], i % 4);
+		else if (i < 8) out[i] = wbyte(state[1], i % 4);
+		else if (i < 12) out[i] = wbyte(state[2], i % 4);
+		else out[i] = wbyte(state[3], i % 4);
+	}
+}
+
+//****************************
+// MAIN function: AES testing
+//****************************
+int main(int argc, char* argv[])
+{
+	int test_failed = 0;
+	// test subBytes
+	printf("Testing subBytes\n");
+	{
+		t_state state = {     0x01234567, 
+		                      0x89abcdef, 
+						      0xdeadbeef, 
+						      0x00112233 };
+
+		t_state res_state = { 0x7c266e85, 
+		                      0xa762bddf,
+							  0x1d95aedf,
+							  0x638293c3 };
+		subBytes(state);
+		// printf("0x%08x, 0x%08x, 0x%08x, 0x%08x\n", state[0], state[1], state[2], state[3]);
+		for (int i = 0; i < 4; i++) {
+			if (state[i] != res_state[i]) { printf("Mismatch at state[%d]!\n", i); test_failed = 1; }
+		}
+	}
+	// test shiftRows
+	printf("Testing shiftRows\n");
+
+	{
+		t_state state = {     0x01234567, 
+		                      0x89abcdef,
+							  0xdeadbeef,
+							  0x00112233 };
+
+		t_state res_state = { 0x00adcd67,
+		                      0x0111beef,
+							  0x892322ef,
+							  0xdeab4533 };
+		shiftRows(state);
+		// printf("0x%08x, 0x%08x, 0x%08x, 0x%08x\n", state[0], state[1], state[2], state[3]);
+		for (int i = 0; i < 4; i++) {
+			if (state[i] != res_state[i]) { printf("Mismatch at state[%d]! 0x%08x 0x%08x\n", i, res_state[i], state[i]); test_failed = 1; }
+		}
+	}
+	// test xtime
+	printf("Testing xtime\n");
+	{
+		uint8_t res[256] = { 0x00, 0x02, 0x04, 0x06, 0x08, 0x0a, 0x0c, 0x0e, 0x10, 0x12,
+			0x14, 0x16, 0x18, 0x1a, 0x1c, 0x1e, 0x20, 0x22, 0x24, 0x26,
+			0x28, 0x2a, 0x2c, 0x2e, 0x30, 0x32, 0x34, 0x36, 0x38, 0x3a,
+			0x3c, 0x3e, 0x40, 0x42, 0x44, 0x46, 0x48, 0x4a, 0x4c, 0x4e,
+			0x50, 0x52, 0x54, 0x56, 0x58, 0x5a, 0x5c, 0x5e, 0x60, 0x62,
+			0x64, 0x66, 0x68, 0x6a, 0x6c, 0x6e, 0x70, 0x72, 0x74, 0x76,
+			0x78, 0x7a, 0x7c, 0x7e, 0x80, 0x82, 0x84, 0x86, 0x88, 0x8a,
+			0x8c, 0x8e, 0x90, 0x92, 0x94, 0x96, 0x98, 0x9a, 0x9c, 0x9e,
+			0xa0, 0xa2, 0xa4, 0xa6, 0xa8, 0xaa, 0xac, 0xae, 0xb0, 0xb2,
+			0xb4, 0xb6, 0xb8, 0xba, 0xbc, 0xbe, 0xc0, 0xc2, 0xc4, 0xc6,
+			0xc8, 0xca, 0xcc, 0xce, 0xd0, 0xd2, 0xd4, 0xd6, 0xd8, 0xda,
+			0xdc, 0xde, 0xe0, 0xe2, 0xe4, 0xe6, 0xe8, 0xea, 0xec, 0xee,
+			0xf0, 0xf2, 0xf4, 0xf6, 0xf8, 0xfa, 0xfc, 0xfe, 0x1b, 0x19,
+			0x1f, 0x1d, 0x13, 0x11, 0x17, 0x15, 0x0b, 0x09, 0x0f, 0x0d,
+			0x03, 0x01, 0x07, 0x05, 0x3b, 0x39, 0x3f, 0x3d, 0x33, 0x31,
+			0x37, 0x35, 0x2b, 0x29, 0x2f, 0x2d, 0x23, 0x21, 0x27, 0x25,
+			0x5b, 0x59, 0x5f, 0x5d, 0x53, 0x51, 0x57, 0x55, 0x4b, 0x49,
+			0x4f, 0x4d, 0x43, 0x41, 0x47, 0x45, 0x7b, 0x79, 0x7f, 0x7d,
+			0x73, 0x71, 0x77, 0x75, 0x6b, 0x69, 0x6f, 0x6d, 0x63, 0x61,
+			0x67, 0x65, 0x9b, 0x99, 0x9f, 0x9d, 0x93, 0x91, 0x97, 0x95,
+			0x8b, 0x89, 0x8f, 0x8d, 0x83, 0x81, 0x87, 0x85, 0xbb, 0xb9,
+			0xbf, 0xbd, 0xb3, 0xb1, 0xb7, 0xb5, 0xab, 0xa9, 0xaf, 0xad,
+			0xa3, 0xa1, 0xa7, 0xa5, 0xdb, 0xd9, 0xdf, 0xdd, 0xd3, 0xd1,
+			0xd7, 0xd5, 0xcb, 0xc9, 0xcf, 0xcd, 0xc3, 0xc1, 0xc7, 0xc5,
+			0xfb, 0xf9, 0xff, 0xfd, 0xf3, 0xf1, 0xf7, 0xf5, 0xeb, 0xe9,
+			0xef, 0xed, 0xe3, 0xe1, 0xe7, 0xe5 };
+		for (uint16_t i = 0; i < 256; i++) {
+			//printf("0x%02hhx,   ", xtime((uint8_t)i));
+			if (xtime((uint8_t)i)!=res[i]) { 
+				printf("\nMismatch at xtime(0x%02x)! Comparison interrupted.\n", i);  test_failed = 1;
+				break;
+			}
+		}
+		// puts("");
+	}
+	// test mixColumns
+	printf("Testing mixColumns\n");
+	{
+		t_state state = {     0x01234567, 
+		                      0x89abcdef, 
+							  0xdeadbeef, 
+							  0x00112233 };
+
+		t_state res_state = { 0xcd678923, 
+		                      0x45ef01ab, 
+							  0x9e69ba6f, 
+							  0x66334411 };
+		mixColumns(state);
+		// printf("0x%08x, 0x%08x, 0x%08x, 0x%08x\n", state[0], state[1], state[2], state[3]);
+		// printf("0x%08x, 0x%08x, 0x%08x, 0x%08x\n", res_state[0], res_state[1], res_state[2], res_state[3]);
+		for (int i = 0; i < 4; i++) {
+			if (state[i] != res_state[i]) { printf("Mismatch at state[%d]! 0x%08x\n", i, state[i]); test_failed = 1; }
+		}
+	}
+
+	// test key expansion
+	printf("Testing expandKey\n");
+	{
+		uint8_t key_b[16] = { 0xef, 0xbe, 0xad, 0xde, 0xbe, 0xba, 0xfe, 0xca, 0x0D, 0xF0, 0xAD, 0xBA, 0x00, 0x11, 0x22, 0x33 };
+		uint32_t key_w[44] = {  0 /*, ...*/ };
+		uint32_t res_key_w[44] = {
+			0xdeadbeef, 0xcafebabe, 0xbaadf00d, 0x33221100,
+			0xbd6e2d6c, 0x779097d2, 0xcd3d67df, 0xfe1f76df,
+			0x23d5ed56, 0x54457a84, 0x99781d5b, 0x67676b84,
+			0x7c50682d, 0x281512a9, 0xb16d0ff2, 0xd60a6476,
+			0x44a60f66, 0x6cb31dcf, 0xddde123d, 0x0bd4764b,
+			0xf78d474e, 0x9b3e5a81, 0x46e048bc, 0x4d343ef7,
+			0x9f6e5fdc, 0x0450055d, 0x42b04de1, 0x0f847316,
+			0xd8180013, 0xdc48054e, 0x9ef848af, 0x917c3bb9,
+			0x8e991071, 0x52d1153f, 0xcc295d90, 0x5d556629,
+			0x2bd5ec59, 0x7904f966, 0xb52da4f6, 0xe878c2df,
+			0xb54e504a, 0xcc4aa92c, 0x79670dda, 0x911fcf05, 
+		};
+		expandKey(key_b, key_w);
+		for (int i = 0; i < 44; i++) {
+			// printf("0x%08x, ", key_w[i]);
+			// if (i % 4 == 3) printf("\n");
+		}
+
+		for (int i = 0; i < 44; i++) {
+			if (key_w[i] != res_key_w[i]) { 
+				printf("Mismatch at key_w[%d]! Comparison interrupted.\n", i);  test_failed = 1;
+				break;
+			}
+		}
+		printf("Testing addRoundKey\n");
+		// test  AddRoundKey (last round)
+		t_state state = { 0x01234567, 0x89abcdef, 0xdeadbeef, 0x00112233 };
+		t_state res_state = { 0xb46d152d, 0x45e164c3, 0xa7cab335, 0x910eed36 };
+		addRoundKey(state, key_w, 40);
+		printf("0x%08x, 0x%08x, 0x%08x, 0x%08x\n", state[0], state[1], state[2], state[3]);
+		for (int i = 0; i < 4; i++) {
+			if (state[i] != res_state[i]) { printf("Mismatch at state[%d]!\n", i); }
+		}
+
+	}
+
+	// test aes encryption
+	printf("Testing aes\n");
+	{
+		uint8_t key[16] = { 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff };
+		uint8_t in[16]  = { 0xab, 0xcd, 0xef, 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0x01, 0x23, 0x45, 0x67, 0x89 };
+		uint8_t out[16] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+		uint8_t res[16] = { 0xa3, 0x3a, 0xca, 0x68, 0x72, 0xa2, 0x27, 0x74, 0xbf, 0x99, 0xf3, 0x71, 0xaa, 0x99, 0xd2, 0x5a };
+
+		printf("Key: ");
+		hexprint16(key);
+		puts("");
+		printf("In:  ");
+		hexprint16(in);
+		puts("");
+
+		uint32_t expKey[11 * 4];
+		expandKey(key, expKey);
+		
+		aes128(in, out, expKey);
+
+		printf("Out: ");
+		hexprint16(out);
+		puts("");
+
+		for (int i = 0; i < 16; i++) {
+			if (out[i] != res[i]) { printf("Mismatch at out[%02d]! 0x%02x 0x%02x\n", i, out[i], res[i]); test_failed = 1; }
+		}
+	}
+	if (test_failed) {
+		printf("|*********** SOME TEST(S) FAILED ***********|\n");
+		printf("Please fix me!\n");
+	}
+	else {
+		printf("============== All tests OK! ===============\n");
+	}
+	return  test_failed;
+}