diff --git a/cs465/aes/aes.go b/cs465/aes/aes.go
new file mode 100644
index 0000000..0daede1
--- /dev/null
+++ b/cs465/aes/aes.go
@@ -0,0 +1,555 @@
+package aes
+
+import (
+	"encoding/hex"
+	"fmt"
+	"log"
+	"strconv"
+)
+
+var sbox = [][]byte{
+	{0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76},
+	{0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0},
+	{0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15},
+	{0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75},
+	{0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84},
+	{0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf},
+	{0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8},
+	{0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2},
+	{0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73},
+	{0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb},
+	{0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79},
+	{0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08},
+	{0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a},
+	{0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e},
+	{0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf},
+	{0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16},
+}
+
+var invSbox = [][]byte{
+	{0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb},
+	{0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb},
+	{0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e},
+	{0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25},
+	{0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92},
+	{0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84},
+	{0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06},
+	{0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b},
+	{0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73},
+	{0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e},
+	{0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b},
+	{0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4},
+	{0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f},
+	{0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef},
+	{0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61},
+	{0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d},
+}
+
+var mm = []byte{
+	2, 3, 1, 1,
+	1, 2, 3, 1,
+	1, 1, 2, 3,
+	3, 1, 1, 2,
+}
+
+var iMM = []byte{
+	14, 11, 13, 9,
+	9, 14, 11, 13,
+	13, 9, 14, 11,
+	11, 13, 9, 14,
+}
+
+var rcon = []byte{0x00, // rcon[] is 1-based, so the first entry is just a place holder
+	0x01, 0x02, 0x04, 0x08,
+	0x10, 0x20, 0x40, 0x80,
+	0x1B, 0x36, 0x6C, 0xD8,
+	0xAB, 0x4D, 0x9A, 0x2F,
+	0x5E, 0xBC, 0x63, 0xC6,
+	0x97, 0x35, 0x6A, 0xD4,
+	0xB3, 0x7D, 0xFA, 0xEF,
+	0xC5, 0x91, 0x39, 0x72,
+	0xE4, 0xD3, 0xBD, 0x61,
+	0xC2, 0x9F, 0x25, 0x4A,
+	0x94, 0x33, 0x66, 0xCC,
+	0x83, 0x1D, 0x3A, 0x74,
+	0xE8, 0xCB, 0x8D,
+}
+
+//Block renamed []byte type for simplicity
+type Block []byte
+
+var keyexpanded []Block
+var key Block
+
+//ToString writes []Block to a string in ascii form
+func ToString(all []Block, keysize int, k Block, decrypt bool) string {
+	final := ""
+	for _, bl := range all {
+		result := Block{}
+		if decrypt {
+			result = InvCipher(bl, keysize, k)
+		} else {
+			result = Cipher(bl, keysize, k)
+		}
+		final += string(result)
+	}
+	return final
+}
+
+//ToHex writes []Block to a string in hex form
+func ToHex(all []Block, keysize int, k Block, decrypt bool) string {
+	final := ""
+	for _, bl := range all {
+		result := Block{}
+		if decrypt {
+			result = InvCipher(bl, keysize, k)
+		} else {
+			result = Cipher(bl, keysize, k)
+		}
+		for i := 0; i < 16; i++ {
+			final += fmt.Sprintf("0x%x ", result[i])
+		}
+	}
+	return final
+}
+
+//BlockGen helps create []Block from incoming string
+func BlockGen(arg string) []Block {
+	all := []Block{}
+	b := Block{}
+	for i, char := range arg {
+		value, err := strconv.ParseUint(
+			hex.EncodeToString(
+				[]byte(string(char))),
+			16,
+			32,
+		)
+		if err != nil {
+			log.Fatal(err)
+		}
+		if i%16 == 0 && i > 0 {
+			all = append(all, b)
+			b = b[:0]
+		}
+		b = append(b, byte(value))
+		if i == len(arg)-1 {
+			all = append(all, b)
+		}
+	}
+	return all
+}
+
+//Cipher performs AES cipher
+func Cipher(cur Block, bit int, incomingKey Block) Block {
+	if len(cur) != 16 {
+		missing := 16 - len(cur)
+		for i := 0; i < missing; i++ {
+			cur = append(cur, 0x00)
+		}
+	}
+	key = Block{}
+	keyexpanded = []Block{}
+	assignKey(incomingKey)
+	if bit == 128 {
+		keyExpansionBase(128)
+		cur = addRoundKey(cur, 0)
+		for i := 0; i < 9; i++ {
+			cur = subBytes(cur)
+			cur = shiftRows(cur)
+			cur = mixColumns(cur)
+			cur = addRoundKey(cur, i+1)
+		}
+		cur = subBytes(cur)
+		cur = shiftRows(cur)
+		cur = addRoundKey(cur, 10)
+		return cur
+	}
+	if bit == 192 {
+		keyExpansionBase(192)
+		cur = addRoundKey(cur, 0)
+		for i := 0; i < 11; i++ {
+			cur = subBytes(cur)
+			cur = shiftRows(cur)
+			cur = mixColumns(cur)
+			cur = addRoundKey(cur, i+1)
+			if i == 0 {
+			}
+		}
+		cur = subBytes(cur)
+		cur = shiftRows(cur)
+		cur = addRoundKey(cur, 12)
+		return cur
+	}
+	if bit == 256 {
+		keyExpansionBase(256)
+		cur = addRoundKey(cur, 0)
+		for i := 0; i < 13; i++ {
+			cur = subBytes(cur)
+			cur = shiftRows(cur)
+			cur = mixColumns(cur)
+			cur = addRoundKey(cur, i+1)
+			if i == 0 {
+			}
+		}
+		cur = subBytes(cur)
+		cur = shiftRows(cur)
+		cur = addRoundKey(cur, 14)
+		return cur
+	}
+	return cur
+}
+
+//InvCipher inverse AES cipher
+func InvCipher(cur Block, bit int, incomingKey Block) Block {
+	if len(cur) != 16 {
+		missing := 16 - len(cur)
+		for i := 0; i < missing; i++ {
+			cur = append(cur, 0x00)
+		}
+	}
+	key = Block{}
+	keyexpanded = []Block{}
+	assignKey(incomingKey)
+	if bit == 128 {
+		keyExpansionBase(128)
+		cur = addRoundKey(cur, 10)
+		for i := 9; i > 0; i-- {
+			cur = invShiftRows(cur)
+			cur = invSubBytes(cur)
+			cur = addRoundKey(cur, i)
+			cur = invMixColumns(cur)
+		}
+		cur = invSubBytes(cur)
+		cur = invShiftRows(cur)
+		cur = addRoundKey(cur, 0)
+		return cur
+	}
+	if bit == 192 {
+		keyExpansionBase(192)
+		cur = addRoundKey(cur, 12)
+		for i := 11; i > 0; i-- {
+			cur = invShiftRows(cur)
+			cur = invSubBytes(cur)
+			cur = addRoundKey(cur, i)
+			cur = invMixColumns(cur)
+		}
+		cur = invSubBytes(cur)
+		cur = invShiftRows(cur)
+		cur = addRoundKey(cur, 0)
+		return cur
+	}
+	if bit == 256 {
+		keyExpansionBase(256)
+		cur = addRoundKey(cur, 14)
+		for i := 13; i > 0; i-- {
+			cur = invShiftRows(cur)
+			cur = invSubBytes(cur)
+			cur = addRoundKey(cur, i)
+			cur = invMixColumns(cur)
+		}
+		cur = invSubBytes(cur)
+		cur = invShiftRows(cur)
+		cur = addRoundKey(cur, 0)
+		return cur
+	}
+	return cur
+}
+
+func addRoundKey(cur Block, iteration int) Block {
+	for i := 0; i < 16; i++ {
+		cur[i] = cur[i] ^ keyexpanded[iteration][i]
+	}
+	return cur
+}
+
+func assignKey(cur Block) {
+	key = cur
+}
+
+func keyExpansionBase(keysize int) {
+	if keysize == 128 {
+		keyexpanded = append(keyexpanded, key)
+		for i := 0; i < 10; i++ {
+			keyExpansion(keyexpanded[i], i+1)
+		}
+	} else if keysize == 192 {
+		keyexpanded = append(keyexpanded, key)
+		for i := 0; i < 8; i++ {
+			keyExpansion192(keyexpanded[i], i+1)
+		}
+		temp := keyexpanded
+		keyexpanded = []Block{}
+		for i := 0; i < 9; i++ {
+			if i == 8 {
+				a := Block{
+					temp[i][0], temp[i][1], temp[i][2], temp[i][3],
+					temp[i][6], temp[i][7], temp[i][8], temp[i][9],
+					temp[i][12], temp[i][13], temp[i][14], temp[i][15],
+					temp[i][18], temp[i][19], temp[i][20], temp[i][21],
+				}
+				b := Block{
+					temp[i][4], temp[i][5], 0, 0,
+					temp[i][10], temp[i][11], 0, 0,
+					temp[i][16], temp[i][17], 0, 0,
+					temp[i][22], temp[i][23], 0, 0,
+				}
+				keyexpanded = append(keyexpanded, a)
+				keyexpanded = append(keyexpanded, b)
+			} else {
+				a := Block{
+					temp[i][0], temp[i][1], temp[i][2], temp[i][3],
+					temp[i][6], temp[i][7], temp[i][8], temp[i][9],
+					temp[i][12], temp[i][13], temp[i][14], temp[i][15],
+					temp[i][18], temp[i][19], temp[i][20], temp[i][21],
+				}
+				b := Block{
+					temp[i][4], temp[i][5], temp[i+1][0], temp[i+1][1],
+					temp[i][10], temp[i][11], temp[i+1][6], temp[i+1][7],
+					temp[i][16], temp[i][17], temp[i+1][12], temp[i+1][13],
+					temp[i][22], temp[i][23], temp[i+1][18], temp[i+1][19],
+				}
+				c := Block{
+					temp[i+1][2], temp[i+1][3], temp[i+1][4], temp[i+1][5],
+					temp[i+1][8], temp[i+1][9], temp[i+1][10], temp[i+1][11],
+					temp[i+1][14], temp[i+1][15], temp[i+1][16], temp[i+1][17],
+					temp[i+1][20], temp[i+1][21], temp[i+1][22], temp[i+1][23],
+				}
+				keyexpanded = append(keyexpanded, a)
+				keyexpanded = append(keyexpanded, b)
+				keyexpanded = append(keyexpanded, c)
+			}
+			i++
+		}
+	} else if keysize == 256 {
+		keyexpanded = append(keyexpanded, key)
+		for i := 0; i < 8; i++ {
+			keyExpansion256(keyexpanded[i], i+1)
+		}
+		temp := keyexpanded
+		keyexpanded = []Block{}
+		for i := 0; i < 9; i++ {
+			a := Block{
+				temp[i][0], temp[i][1], temp[i][2], temp[i][3],
+				temp[i][8], temp[i][9], temp[i][10], temp[i][11],
+				temp[i][16], temp[i][17], temp[i][18], temp[i][19],
+				temp[i][24], temp[i][25], temp[i][26], temp[i][27],
+			}
+			b := Block{
+				temp[i][4], temp[i][5], temp[i][6], temp[i][7],
+				temp[i][12], temp[i][13], temp[i][14], temp[i][15],
+				temp[i][20], temp[i][21], temp[i][22], temp[i][23],
+				temp[i][28], temp[i][29], temp[i][30], temp[i][31],
+			}
+			keyexpanded = append(keyexpanded, a)
+			keyexpanded = append(keyexpanded, b)
+		}
+	}
+}
+
+func keyExpansion(cur Block, iteration int) Block {
+	var nb = Block{ //nb = nextBlock
+		0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00,
+	}
+	rotword := []byte{cur[7], cur[11], cur[15], cur[3]}
+	for i := 0; i < 4; i++ {
+		upper, lower := splitBytes(rotword[i])
+		rotword[i] = sbox[upper][lower]
+	}
+	rotword[0] = rotword[0] ^ cur[0] ^ rcon[iteration]
+	rotword[1] = rotword[1] ^ cur[4]
+	rotword[2] = rotword[2] ^ cur[8]
+	rotword[3] = rotword[3] ^ cur[12]
+
+	nb[0], nb[4], nb[8], nb[12] = rotword[0], rotword[1], rotword[2], rotword[3]
+	nb[1], nb[5], nb[9], nb[13] = nb[0]^cur[1], nb[4]^cur[5], nb[8]^cur[9], nb[12]^cur[13]
+	nb[2], nb[6], nb[10], nb[14] = nb[1]^cur[2], nb[5]^cur[6], nb[9]^cur[10], nb[13]^cur[14]
+	nb[3], nb[7], nb[11], nb[15] = nb[2]^cur[3], nb[6]^cur[7], nb[10]^cur[11], nb[14]^cur[15]
+	keyexpanded = append(keyexpanded, nb)
+	return nb
+}
+
+func keyExpansion192(cur Block, iteration int) Block {
+	var nb = Block{ //nb = nextBlock
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	}
+	rotword := []byte{cur[11], cur[17], cur[23], cur[5]}
+	for i := 0; i < 4; i++ {
+		upper, lower := splitBytes(rotword[i])
+		rotword[i] = sbox[upper][lower]
+	}
+	rotword[0] = rotword[0] ^ cur[0] ^ rcon[iteration]
+	rotword[1] = rotword[1] ^ cur[6]
+	rotword[2] = rotword[2] ^ cur[12]
+	rotword[3] = rotword[3] ^ cur[18]
+
+	nb[0], nb[6], nb[12], nb[18] = rotword[0], rotword[1], rotword[2], rotword[3]
+	nb[1], nb[7], nb[13], nb[19] = nb[0]^cur[1], nb[6]^cur[7], nb[12]^cur[13], nb[18]^cur[19]
+	nb[2], nb[8], nb[14], nb[20] = nb[1]^cur[2], nb[7]^cur[8], nb[13]^cur[14], nb[19]^cur[20]
+	nb[3], nb[9], nb[15], nb[21] = nb[2]^cur[3], nb[8]^cur[9], nb[14]^cur[15], nb[20]^cur[21]
+	nb[4], nb[10], nb[16], nb[22] = nb[3]^cur[4], nb[9]^cur[10], nb[15]^cur[16], nb[21]^cur[22]
+	nb[5], nb[11], nb[17], nb[23] = nb[4]^cur[5], nb[10]^cur[11], nb[16]^cur[17], nb[22]^cur[23]
+	keyexpanded = append(keyexpanded, nb)
+
+	return nb
+}
+
+func keyExpansion256(cur Block, iteration int) Block {
+	var nb = Block{ //nb = nextBlock
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	}
+	rotword := []byte{cur[15], cur[23], cur[31], cur[7]}
+	for i := 0; i < 4; i++ {
+		upper, lower := splitBytes(rotword[i])
+		rotword[i] = sbox[upper][lower]
+	}
+	rotword[0] = rotword[0] ^ cur[0] ^ rcon[iteration]
+	rotword[1] = rotword[1] ^ cur[8]
+	rotword[2] = rotword[2] ^ cur[16]
+	rotword[3] = rotword[3] ^ cur[24]
+
+	nb[0], nb[8], nb[16], nb[24] = rotword[0], rotword[1], rotword[2], rotword[3]
+	nb[1], nb[9], nb[17], nb[25] = nb[0]^cur[1], nb[8]^cur[9], nb[16]^cur[17], nb[24]^cur[25]
+	nb[2], nb[10], nb[18], nb[26] = nb[1]^cur[2], nb[9]^cur[10], nb[17]^cur[18], nb[25]^cur[26]
+	nb[3], nb[11], nb[19], nb[27] = nb[2]^cur[3], nb[10]^cur[11], nb[18]^cur[19], nb[26]^cur[27]
+	sw := []byte{nb[3], nb[11], nb[19], nb[27]} //sw = subword
+	for i := 0; i < 4; i++ {
+		upper, lower := splitBytes(sw[i])
+		sw[i] = sbox[upper][lower]
+	}
+	nb[4], nb[12], nb[20], nb[28] = sw[0]^cur[4], sw[1]^cur[12], sw[2]^cur[20], sw[3]^cur[28]
+	nb[5], nb[13], nb[21], nb[29] = nb[4]^cur[5], nb[12]^cur[13], nb[20]^cur[21], nb[28]^cur[29]
+	nb[6], nb[14], nb[22], nb[30] = nb[5]^cur[6], nb[13]^cur[14], nb[21]^cur[22], nb[29]^cur[30]
+	nb[7], nb[15], nb[23], nb[31] = nb[6]^cur[7], nb[14]^cur[15], nb[22]^cur[23], nb[30]^cur[31]
+	keyexpanded = append(keyexpanded, nb)
+
+	return nb
+}
+
+func splitBytes(b byte) (byte, byte) {
+	return b >> 4, b & 0x0f
+}
+
+func subBytes(cur Block) Block {
+	for i := 0; i < 16; i++ {
+		upper, lower := splitBytes(cur[i])
+		cur[i] = sbox[upper][lower]
+	}
+	return cur
+}
+
+func invSubBytes(cur Block) Block {
+	for i := 0; i < 16; i++ {
+		upper, lower := splitBytes(cur[i])
+		cur[i] = invSbox[upper][lower]
+	}
+	return cur
+}
+
+func xtime(cur byte) []byte {
+	var bytes []byte
+	bytes = append(bytes, cur)
+	for i := 1; i < 8; i++ { // first iteration done outside of for-loop
+		if (cur >> 7) == 1 {
+			cur = cur << 1
+			cur = cur ^ 0x1b
+		} else {
+			cur = cur << 1
+		}
+		bytes = append(bytes, cur)
+	}
+	return bytes
+}
+
+func ffmult(cur []byte, multiplier byte) byte {
+	if multiplier == 1 {
+		return cur[0]
+	} else if multiplier == 2 {
+		return cur[1]
+	} else if multiplier == 3 {
+		return cur[0] ^ cur[1]
+	} else if multiplier == 9 {
+		return cur[0] ^ cur[3]
+	} else if multiplier == 11 {
+		return cur[0] ^ cur[1] ^ cur[3]
+	} else if multiplier == 13 {
+		return cur[0] ^ cur[2] ^ cur[3]
+	} else if multiplier == 14 {
+		return cur[1] ^ cur[2] ^ cur[3]
+	}
+	return 0
+}
+
+func mixColumnsAssist(cur []byte) []byte {
+	a1 := ffmult(xtime(cur[0]), mm[0]) ^ ffmult(xtime(cur[1]), mm[1]) ^ ffmult(xtime(cur[2]), mm[2]) ^ ffmult(xtime(cur[3]), mm[3])
+	a2 := ffmult(xtime(cur[0]), mm[4]) ^ ffmult(xtime(cur[1]), mm[5]) ^ ffmult(xtime(cur[2]), mm[6]) ^ ffmult(xtime(cur[3]), mm[7])
+	a3 := ffmult(xtime(cur[0]), mm[8]) ^ ffmult(xtime(cur[1]), mm[9]) ^ ffmult(xtime(cur[2]), mm[10]) ^ ffmult(xtime(cur[3]), mm[11])
+	a4 := ffmult(xtime(cur[0]), mm[12]) ^ ffmult(xtime(cur[1]), mm[13]) ^ ffmult(xtime(cur[2]), mm[14]) ^ ffmult(xtime(cur[3]), mm[15])
+	return []byte{a1, a2, a3, a4}
+}
+
+func mixColumns(cur Block) Block {
+	col1 := []byte{cur[0], cur[4], cur[8], cur[12]}
+	col2 := []byte{cur[1], cur[5], cur[9], cur[13]}
+	col3 := []byte{cur[2], cur[6], cur[10], cur[14]}
+	col4 := []byte{cur[3], cur[7], cur[11], cur[15]}
+	col1 = mixColumnsAssist(col1)
+	col2 = mixColumnsAssist(col2)
+	col3 = mixColumnsAssist(col3)
+	col4 = mixColumnsAssist(col4)
+	cur = Block{
+		col1[0], col2[0], col3[0], col4[0],
+		col1[1], col2[1], col3[1], col4[1],
+		col1[2], col2[2], col3[2], col4[2],
+		col1[3], col2[3], col3[3], col4[3],
+	}
+	return cur
+}
+
+func invMixColumns(cur Block) Block {
+	col1 := []byte{cur[0], cur[4], cur[8], cur[12]}
+	col2 := []byte{cur[1], cur[5], cur[9], cur[13]}
+	col3 := []byte{cur[2], cur[6], cur[10], cur[14]}
+	col4 := []byte{cur[3], cur[7], cur[11], cur[15]}
+	col1 = invMixColumnsAssist(col1)
+	col2 = invMixColumnsAssist(col2)
+	col3 = invMixColumnsAssist(col3)
+	col4 = invMixColumnsAssist(col4)
+	cur = Block{
+		col1[0], col2[0], col3[0], col4[0],
+		col1[1], col2[1], col3[1], col4[1],
+		col1[2], col2[2], col3[2], col4[2],
+		col1[3], col2[3], col3[3], col4[3],
+	}
+	return cur
+}
+
+func invMixColumnsAssist(cur []byte) []byte {
+	a1 := ffmult(xtime(cur[0]), iMM[0]) ^ ffmult(xtime(cur[1]), iMM[1]) ^ ffmult(xtime(cur[2]), iMM[2]) ^ ffmult(xtime(cur[3]), iMM[3])
+	a2 := ffmult(xtime(cur[0]), iMM[4]) ^ ffmult(xtime(cur[1]), iMM[5]) ^ ffmult(xtime(cur[2]), iMM[6]) ^ ffmult(xtime(cur[3]), iMM[7])
+	a3 := ffmult(xtime(cur[0]), iMM[8]) ^ ffmult(xtime(cur[1]), iMM[9]) ^ ffmult(xtime(cur[2]), iMM[10]) ^ ffmult(xtime(cur[3]), iMM[11])
+	a4 := ffmult(xtime(cur[0]), iMM[12]) ^ ffmult(xtime(cur[1]), iMM[13]) ^ ffmult(xtime(cur[2]), iMM[14]) ^ ffmult(xtime(cur[3]), iMM[15])
+	return []byte{a1, a2, a3, a4}
+}
+
+func shiftRows(cur Block) Block {
+	cur[4], cur[5], cur[6], cur[7] = cur[5], cur[6], cur[7], cur[4]
+	cur[8], cur[9], cur[10], cur[11] = cur[10], cur[11], cur[8], cur[9]
+	cur[12], cur[13], cur[14], cur[15] = cur[15], cur[12], cur[13], cur[14]
+	return cur
+}
+
+func invShiftRows(cur Block) Block {
+	cur[4], cur[5], cur[6], cur[7] = cur[7], cur[4], cur[5], cur[6]
+	cur[8], cur[9], cur[10], cur[11] = cur[10], cur[11], cur[8], cur[9]
+	cur[12], cur[13], cur[14], cur[15] = cur[13], cur[14], cur[15], cur[12]
+	return cur
+}
diff --git a/cs465/aes/aes_test.go b/cs465/aes/aes_test.go
new file mode 100644
index 0000000..5f5c6b3
--- /dev/null
+++ b/cs465/aes/aes_test.go
@@ -0,0 +1,356 @@
+package aes
+
+import (
+	"bytes"
+	"testing"
+)
+
+func TestShiftRows(t *testing.T) {
+	input := Block{
+		0, 1, 2, 3,
+		4, 5, 6, 7,
+		8, 9, 10, 11,
+		12, 13, 14, 15,
+	}
+	expected := Block{
+		0, 1, 2, 3,
+		5, 6, 7, 4,
+		10, 11, 8, 9,
+		15, 12, 13, 14,
+	}
+	actual := shiftRows(input)
+	if !bytes.Equal(expected, actual) {
+		t.Errorf(
+			"failed to get right ShiftRows:\n\texpected: % x\n\t  actual: % x",
+			expected,
+			actual,
+		)
+
+	}
+}
+
+func TestSubBytes(t *testing.T) {
+	input := Block{
+		0x19, 0xa0, 0x9a, 0xe9,
+		0x3d, 0xf4, 0xc6, 0xf8,
+		0xe3, 0xe2, 0x8d, 0x48,
+		0xbe, 0x2b, 0x2a, 0x08,
+	}
+	expected := Block{
+		0xd4, 0xe0, 0xb8, 0x1e,
+		0x27, 0xbf, 0xb4, 0x41,
+		0x11, 0x98, 0x5d, 0x52,
+		0xae, 0xf1, 0xe5, 0x30,
+	}
+	actual := subBytes(input)
+	if !bytes.Equal(expected, actual) {
+		t.Errorf(
+			"failed to get right ShiftRows:\n\texpected: % x\n\t  actual: % x",
+			expected,
+			actual,
+		)
+	}
+}
+
+func TestSplitBytes(t *testing.T) {
+	input := byte(0xab)
+	expected1 := byte(0xa)
+	expected2 := byte(0xb)
+	actual1, actual2 := splitBytes(input)
+	if expected1 != actual1 || expected2 != actual2 {
+		t.Errorf(
+			"failed to get SplitBytes:\n\texpected: 0x%x 0x%x\n\t  actual: 0x%x 0x%x",
+			expected1,
+			expected2,
+			actual1,
+			actual2,
+		)
+	}
+}
+
+func TestXtime(t *testing.T) {
+	input := byte(0x14)
+	expected := []byte{
+		0x14, 0x28, 0x50, 0xa0,
+		0x5b, 0xb6, 0x77, 0xee,
+	}
+	actual := xtime(input)
+	if !bytes.Equal(expected, actual) {
+		t.Errorf(
+			"failed to get Xtime:\n\texpected: % x\n\tactual: % x",
+			expected,
+			actual,
+		)
+	}
+}
+
+func TestFFmult(t *testing.T) {
+	input := xtime(0x14)
+	expected1 := byte(0x14)
+	expected2 := byte(0x28)
+	expected3 := byte(0x3c)
+	actual1 := ffmult(input, 1)
+	actual2 := ffmult(input, 2)
+	actual3 := ffmult(input, 3)
+	if expected1 != actual1 || expected2 != actual2 || expected3 != actual3 {
+		t.Errorf(
+			"failed to get FFmult:\n\texpected: 0x% x 0x% x 0x% x\n\t actual:0x% x 0x% x 0x% x",
+			expected1,
+			expected2,
+			expected3,
+			actual1,
+			actual2,
+			actual3,
+		)
+	}
+}
+
+func TestMixColumns(t *testing.T) {
+	input := Block{
+		0xdb, 0xf2, 0x2d, 0x01,
+		0x13, 0x0a, 0x26, 0x01,
+		0x53, 0x22, 0x31, 0x01,
+		0x45, 0x5c, 0x4c, 0x01,
+	}
+	expected := Block{
+		0x8e, 0x9f, 0x4d, 0x01,
+		0x4d, 0xdc, 0x7e, 0x01,
+		0xa1, 0x58, 0xbd, 0x01,
+		0xbc, 0x9d, 0xf8, 0x01,
+	}
+	actual := mixColumns(input)
+	for i := 0; i < 16; i++ {
+		if actual[i] != expected[i] {
+			t.Errorf(
+				"failed to get MixColumn:\n\texpected: %v \n\tactual: %v", expected, actual,
+			)
+		}
+	}
+}
+
+func TestCipher(t *testing.T) {
+	key := Block{
+		0x2b, 0x28, 0xab, 0x09,
+		0x7e, 0xae, 0xf7, 0xcf,
+		0x15, 0xd2, 0x15, 0x4f,
+		0x16, 0xa6, 0x88, 0x3c,
+	}
+	input := Block{
+		0x32, 0x88, 0x31, 0xe0,
+		0x43, 0x5a, 0x31, 0x37,
+		0xf6, 0x30, 0x98, 0x07,
+		0xa8, 0x8d, 0xa2, 0x34,
+	}
+	expected := Block{
+		0x39, 0x02, 0xdc, 0x19,
+		0x25, 0xdc, 0x11, 0x6a,
+		0x84, 0x09, 0x85, 0x0b,
+		0x1d, 0xfb, 0x97, 0x32,
+	}
+	actual := Cipher(input, 128, key)
+	for i := 0; i < 16; i++ {
+		if actual[i] != expected[i] {
+			t.Errorf(
+				"failed to get Cipher:\n\texpected: %v\n\tactual: %v", expected, actual,
+			)
+		}
+	}
+
+	//Test case for 128 from FIPS
+
+	key = Block{
+		0x00, 0x04, 0x08, 0x0c,
+		0x01, 0x05, 0x09, 0x0d,
+		0x02, 0x06, 0x0a, 0x0e,
+		0x03, 0x07, 0x0b, 0x0f,
+	}
+	input = Block{
+		0x00, 0x44, 0x88, 0xcc,
+		0x11, 0x55, 0x99, 0xdd,
+		0x22, 0x66, 0xaa, 0xee,
+		0x33, 0x77, 0xbb, 0xff,
+	}
+	expected = Block{
+		0x69, 0x6a, 0xd8, 0x70,
+		0xc4, 0x7b, 0xcd, 0xb4,
+		0xe0, 0x04, 0xb7, 0xc5,
+		0xd8, 0x30, 0x80, 0x5a,
+	}
+	actual = Cipher(input, 128, key)
+	for i := 0; i < 16; i++ {
+		if actual[i] != expected[i] {
+			t.Errorf(
+				"failed to get Cipher:\n\texpected: %v\n\tactual: %v", expected, actual,
+			)
+		}
+	}
+
+	//Test case for 192 from FIPS
+	key = Block{
+		0x00, 0x04, 0x08, 0x0c, 0x10, 0x14,
+		0x01, 0x05, 0x09, 0x0d, 0x11, 0x15,
+		0x02, 0x06, 0x0a, 0x0e, 0x12, 0x16,
+		0x03, 0x07, 0x0b, 0x0f, 0x13, 0x17,
+	}
+	input = Block{
+		0x00, 0x44, 0x88, 0xcc,
+		0x11, 0x55, 0x99, 0xdd,
+		0x22, 0x66, 0xaa, 0xee,
+		0x33, 0x77, 0xbb, 0xff,
+	}
+	expected = Block{
+		0xdd, 0x86, 0x6e, 0xec,
+		0xa9, 0x4c, 0xaf, 0x0d,
+		0x7c, 0xdf, 0x70, 0x71,
+		0xa4, 0xe0, 0xa0, 0x91,
+	}
+	actual = Cipher(input, 192, key)
+	for i := 0; i < 16; i++ {
+		if actual[i] != expected[i] {
+			t.Errorf(
+				"failed to get Cipher:\n\texpected: %v\n\tactual: %v", expected, actual,
+			)
+		}
+	}
+
+	//Test case for 256 from FIPS
+	key = Block{
+		0x00, 0x04, 0x08, 0x0c, 0x10, 0x14, 0x18, 0x1c,
+		0x01, 0x05, 0x09, 0x0d, 0x11, 0x15, 0x19, 0x1d,
+		0x02, 0x06, 0x0a, 0x0e, 0x12, 0x16, 0x1a, 0x1e,
+		0x03, 0x07, 0x0b, 0x0f, 0x13, 0x17, 0x1b, 0x1f,
+	}
+	input = Block{
+		0x00, 0x44, 0x88, 0xcc,
+		0x11, 0x55, 0x99, 0xdd,
+		0x22, 0x66, 0xaa, 0xee,
+		0x33, 0x77, 0xbb, 0xff,
+	}
+	expected = Block{
+		0x8e, 0x51, 0xea, 0x4b,
+		0xa2, 0x67, 0xfc, 0x49,
+		0xb7, 0x45, 0x49, 0x60,
+		0xca, 0xbf, 0x90, 0x89,
+	}
+	actual = Cipher(input, 256, key)
+	for i := 0; i < 16; i++ {
+		if actual[i] != expected[i] {
+			t.Errorf(
+				"failed to get Cipher:\n\texpected: %v\n\tactual: %v", expected, actual,
+			)
+		}
+	}
+}
+
+func TestInvCipher(t *testing.T) {
+	key := Block{
+		0x2b, 0x28, 0xab, 0x09,
+		0x7e, 0xae, 0xf7, 0xcf,
+		0x15, 0xd2, 0x15, 0x4f,
+		0x16, 0xa6, 0x88, 0x3c,
+	}
+	input := Block{
+		0x39, 0x02, 0xdc, 0x19,
+		0x25, 0xdc, 0x11, 0x6a,
+		0x84, 0x09, 0x85, 0x0b,
+		0x1d, 0xfb, 0x97, 0x32,
+	}
+	expected := Block{
+		0x32, 0x88, 0x31, 0xe0,
+		0x43, 0x5a, 0x31, 0x37,
+		0xf6, 0x30, 0x98, 0x07,
+		0xa8, 0x8d, 0xa2, 0x34,
+	}
+	actual := InvCipher(input, 128, key)
+	for i := 0; i < 16; i++ {
+		if actual[i] != expected[i] {
+			t.Errorf(
+				"failed to get Cipher:\n\texpected: %v\n\tactual: %v", expected, actual,
+			)
+		}
+	}
+
+	//Test case for 128 from FIPS
+	key = Block{
+		0x00, 0x04, 0x08, 0x0c,
+		0x01, 0x05, 0x09, 0x0d,
+		0x02, 0x06, 0x0a, 0x0e,
+		0x03, 0x07, 0x0b, 0x0f,
+	}
+	input = Block{
+		0x69, 0x6a, 0xd8, 0x70,
+		0xc4, 0x7b, 0xcd, 0xb4,
+		0xe0, 0x04, 0xb7, 0xc5,
+		0xd8, 0x30, 0x80, 0x5a,
+	}
+	expected = Block{
+		0x00, 0x44, 0x88, 0xcc,
+		0x11, 0x55, 0x99, 0xdd,
+		0x22, 0x66, 0xaa, 0xee,
+		0x33, 0x77, 0xbb, 0xff,
+	}
+	actual = InvCipher(input, 128, key)
+	for i := 0; i < 16; i++ {
+		if actual[i] != expected[i] {
+			t.Errorf(
+				"failed to get Cipher:\n\texpected: %v\n\tactual: %v", expected, actual,
+			)
+		}
+	}
+
+	//Test case for 192 from FIPS
+	key = Block{
+		0x00, 0x04, 0x08, 0x0c, 0x10, 0x14,
+		0x01, 0x05, 0x09, 0x0d, 0x11, 0x15,
+		0x02, 0x06, 0x0a, 0x0e, 0x12, 0x16,
+		0x03, 0x07, 0x0b, 0x0f, 0x13, 0x17,
+	}
+	input = Block{
+		0xdd, 0x86, 0x6e, 0xec,
+		0xa9, 0x4c, 0xaf, 0x0d,
+		0x7c, 0xdf, 0x70, 0x71,
+		0xa4, 0xe0, 0xa0, 0x91,
+	}
+	expected = Block{
+		0x00, 0x44, 0x88, 0xcc,
+		0x11, 0x55, 0x99, 0xdd,
+		0x22, 0x66, 0xaa, 0xee,
+		0x33, 0x77, 0xbb, 0xff,
+	}
+	actual = InvCipher(input, 192, key)
+	for i := 0; i < 16; i++ {
+		if actual[i] != expected[i] {
+			t.Errorf(
+				"failed to get Cipher:\n\texpected: %v \n\tactual:%v", expected, actual,
+			)
+		}
+	}
+
+	//Test case for 256 from FIPS
+	key = Block{
+		0x00, 0x04, 0x08, 0x0c, 0x10, 0x14, 0x18, 0x1c,
+		0x01, 0x05, 0x09, 0x0d, 0x11, 0x15, 0x19, 0x1d,
+		0x02, 0x06, 0x0a, 0x0e, 0x12, 0x16, 0x1a, 0x1e,
+		0x03, 0x07, 0x0b, 0x0f, 0x13, 0x17, 0x1b, 0x1f,
+	}
+	input = Block{
+		0x8e, 0x51, 0xea, 0x4b,
+		0xa2, 0x67, 0xfc, 0x49,
+		0xb7, 0x45, 0x49, 0x60,
+		0xca, 0xbf, 0x90, 0x89,
+	}
+	expected = Block{
+		0x00, 0x44, 0x88, 0xcc,
+		0x11, 0x55, 0x99, 0xdd,
+		0x22, 0x66, 0xaa, 0xee,
+		0x33, 0x77, 0xbb, 0xff,
+	}
+	actual = InvCipher(input, 256, key)
+	for i := 0; i < 16; i++ {
+		if actual[i] != expected[i] {
+			t.Errorf(
+				"failed to get Cipher:\n\texpected: %v\n\tactual: %v", expected, actual,
+			)
+		}
+	}
+}
diff --git a/cs465/main.go b/cs465/main.go
new file mode 100644
index 0000000..f447bd3
--- /dev/null
+++ b/cs465/main.go
@@ -0,0 +1,98 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+
+	"s.mcquay.me/dm/school/cs465/aes"
+
+	"github.com/spf13/cobra"
+)
+
+var key128 = aes.Block{
+	0x2b, 0x28, 0xab, 0x09,
+	0x7e, 0xae, 0xf7, 0xcf,
+	0x15, 0xd2, 0x15, 0x4f,
+	0x16, 0xa6, 0x88, 0x3c,
+}
+var key192 = aes.Block{
+	0x00, 0x04, 0x08, 0x0c, 0x10, 0x14,
+	0x01, 0x05, 0x09, 0x0d, 0x11, 0x15,
+	0x02, 0x06, 0x0a, 0x0e, 0x12, 0x16,
+	0x03, 0x07, 0x0b, 0x0f, 0x13, 0x17,
+}
+var key256 = aes.Block{
+	0x00, 0x04, 0x08, 0x0c, 0x10, 0x14, 0x18, 0x1c,
+	0x01, 0x05, 0x09, 0x0d, 0x11, 0x15, 0x19, 0x1d,
+	0x02, 0x06, 0x0a, 0x0e, 0x12, 0x16, 0x1a, 0x1e,
+	0x03, 0x07, 0x0b, 0x0f, 0x13, 0x17, 0x1b, 0x1f,
+}
+
+func main() {
+	var keysize int
+	var decrypt bool
+	var ascii bool
+
+	var aes = &cobra.Command{
+		Use:   "aes",
+		Short: "aes cipher",
+		Long:  `perform aes cipher`,
+		Run: func(cmd *cobra.Command, args []string) {
+			if len(args) < 1 {
+				fmt.Println("missing input, see -h (--help) for more info")
+				os.Exit(1)
+			}
+			for _, arg := range args {
+				all := aes.BlockGen(arg)
+				if ascii {
+					switch keysize {
+					case 128:
+						fmt.Println(aes.ToString(all, 128, key128, decrypt))
+					case 192:
+						fmt.Println(aes.ToString(all, 192, key192, decrypt))
+					case 256:
+						fmt.Println(aes.ToString(all, 256, key256, decrypt))
+					default:
+						log.Fatal("keysize not valid")
+					}
+				} else {
+					switch keysize {
+					case 128:
+						fmt.Println(aes.ToHex(all, 128, key128, decrypt))
+					case 192:
+						fmt.Println(aes.ToHex(all, 192, key192, decrypt))
+					case 256:
+						fmt.Println(aes.ToHex(all, 256, key256, decrypt))
+					default:
+						log.Fatal("keysize not valid")
+					}
+				}
+			}
+		},
+	}
+	aes.Flags().IntVarP(
+		&keysize,
+		"keysize",
+		"k",
+		0,
+		"keysize",
+	)
+	aes.Flags().BoolVarP(
+		&ascii,
+		"ascii",
+		"a",
+		false,
+		"display in ascii (may mess up terminal :) )",
+	)
+	aes.Flags().BoolVarP(
+		&decrypt,
+		"decrypt",
+		"d",
+		false,
+		"decrypt",
+	)
+	var rootCmd = &cobra.Command{Use: "app"}
+	rootCmd.AddCommand(aes)
+	rootCmd.Execute()
+}