implmented aes subcommand and functions

aes is now done! Uses default key value that is stored in program and
handles block sizes that are not 16 hex values wide by adding 0x00 until
it is 16 wide

main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"fmt"
+	"log"
 	"math/rand"
 	"os"
 	"time"
@@ -15,9 +16,30 @@ func init() {
 	rand.Seed(time.Now().UnixNano())
 }
 
+var key128 = psyfer.Block{
+	0x2b, 0x28, 0xab, 0x09,
+	0x7e, 0xae, 0xf7, 0xcf,
+	0x15, 0xd2, 0x15, 0x4f,
+	0x16, 0xa6, 0x88, 0x3c,
+}
+var key192 = psyfer.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 = psyfer.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 key string
+	var keysize int
 	var decrypt bool
+	var ascii bool
 
 	var trans = &cobra.Command{
 		Use:   "trans mode",
@@ -45,11 +67,40 @@ func main() {
 	}
 
 	var aes = &cobra.Command{
-		Use:   "aes mode -c [cipher] -k [key] -i [input]",
+		Use:   "aes",
 		Short: "aes cipher",
 		Long:  `perform aes cipher`,
 		Run: func(cmd *cobra.Command, args []string) {
-			fmt.Println("missing input, see -h (--help) for more info")
+			if len(args) < 1 {
+				fmt.Println("missing input, see -h (--help) for more info")
+				os.Exit(1)
+			}
+			for _, arg := range args {
+				all := psyfer.BlockGen(arg)
+				if ascii {
+					switch keysize {
+					case 128:
+						fmt.Println(psyfer.ToString(all, 128, key128, decrypt))
+					case 192:
+						fmt.Println(psyfer.ToString(all, 192, key192, decrypt))
+					case 256:
+						fmt.Println(psyfer.ToString(all, 256, key256, decrypt))
+					default:
+						log.Fatal("keysize not valid")
+					}
+				} else {
+					switch keysize {
+					case 128:
+						fmt.Println(psyfer.ToHex(all, 128, key128, decrypt))
+					case 192:
+						fmt.Println(psyfer.ToHex(all, 192, key192, decrypt))
+					case 256:
+						fmt.Println(psyfer.ToHex(all, 256, key256, decrypt))
+					default:
+						log.Fatal("keysize not valid")
+					}
+				}
+			}
 		},
 	}
 
@@ -123,6 +174,7 @@ func main() {
 		},
 	}
 
+	//transpose flags
 	split.Flags().BoolVarP(
 		&decrypt,
 		"decrypt",
@@ -137,7 +189,7 @@ func main() {
 		false,
 		"decrypt",
 	)
-
+	//sub flags
 	sub.Flags().StringVarP(
 		&key,
 		"key",
@@ -145,10 +197,31 @@ func main() {
 		"",
 		"file containing key",
 	)
+	//aes flags
+	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(sub, aes, trans, vig)
-	aes.AddCommand(crack)
 	trans.AddCommand(random, railfence, split)
 	vig.AddCommand(crack)
 	rootCmd.Execute()

psyfer/aes.go

@@ -1,5 +1,12 @@
 package psyfer
 
+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},
@@ -73,7 +80,63 @@ type Block []byte
 var keyexpanded []Block
 var key Block
 
+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
+}
+
+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
+}
+
+func BlockGen(arg string) []Block {
+	all := []Block{}
+	b := Block{}
+	for i, char := range arg {
+		value, err := strconv.Atoi(hex.EncodeToString([]byte(string(char))))
+		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
+}
+
 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)
@@ -85,14 +148,6 @@ func Cipher(cur Block, bit int, incomingKey Block) Block {
 			cur = ShiftRows(cur)
 			cur = MixColumns(cur)
 			cur = AddRoundKey(cur, i+1)
-			//fmt.Printf("\n")
-			//for i := 0; i < 16; i++ {
-			//	fmt.Printf("% x", cur[i])
-			//	if i%4 == 3 {
-			//		fmt.Printf("\n")
-			//	}
-			//}
-
 		}
 		cur = SubBytes(cur)
 		cur = ShiftRows(cur)
@@ -135,6 +190,12 @@ func Cipher(cur Block, bit int, incomingKey Block) Block {
 }
 
 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)