crypto/des: cleanups

R=rsc
CC=golang-dev
https://golang.org/cl/4315050

src/pkg/Makefile

@@ -35,6 +35,7 @@ DIRS=\
 	crypto/blowfish\
 	crypto/cast5\
 	crypto/cipher\
+	crypto/des\
 	crypto/dsa\
 	crypto/ecdsa\
 	crypto/elliptic\

src/pkg/crypto/des/block.go

-// Copyright 2010 The Go Authors. All rights reserved.
+// Copyright 2011 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 package des
 
-// Encrypt one block from src into dst, using the subkeys.
-func encryptBlock(subkeys [16]uint64, dst, src []byte) {
-	// perform initial permutation
-	permutedSrc := permuteBlock(src, initialPermutation[0:])
+import (
+	"encoding/binary"
+)
 
-	// split into left and right halves
-	left := uint32(permutedSrc >> 32)
-	right := uint32(permutedSrc)
+func cryptBlock(subkeys []uint64, dst, src []byte, decrypt bool) {
+	b := binary.BigEndian.Uint64(src)
+	b = permuteBlock(b, initialPermutation[:])
+	left, right := uint32(b>>32), uint32(b)
 
-	// process left and right with feistel function
+	var subkey uint64
 	for i := 0; i < 16; i++ {
-		previousRight := right
-		right = left ^ feistel(right, subkeys[i])
-		left = previousRight
+		if decrypt {
+			subkey = subkeys[15-i]
+		} else {
+			subkey = subkeys[i]
+		}
+
+		left, right = right, left^feistel(right, subkey)
 	}
 	// switch left & right and perform final permutation
 	preOutput := (uint64(right) << 32) | uint64(left)
-	final := uint64ToBytes(permuteBlock(uint64ToBytes(preOutput), finalPermutation[0:]))
+	binary.BigEndian.PutUint64(dst, permuteBlock(preOutput, finalPermutation[:]))
+}
 
-	// copy bytes to destination
-	copy(dst, final)
+// Encrypt one block from src into dst, using the subkeys.
+func encryptBlock(subkeys []uint64, dst, src []byte) {
+	cryptBlock(subkeys, dst, src, false)
 }
 
 // Decrypt one block from src into dst, using the subkeys.
-func decryptBlock(subkeys [16]uint64, dst, src []byte) {
-	// perform initial permutation
-	permutedSrc := permuteBlock(src, initialPermutation[0:])
-
-	// split into left and right halves
-	left := uint32(permutedSrc >> 32)
-	right := uint32(permutedSrc)
-
-	// process left and right with feistel function
-	for i := 0; i < 16; i++ {
-		previousRight := right
-		// decryption reverses order of subkeys
-		right = left ^ feistel(right, subkeys[15-i])
-		left = previousRight
-	}
-	// switch left & right and perform final permutation
-	preOutput := (uint64(right) << 32) | uint64(left)
-	final := uint64ToBytes(permuteBlock(uint64ToBytes(preOutput), finalPermutation[0:]))
-
-	// copy bytes to destination
-	copy(dst, final)
+func decryptBlock(subkeys []uint64, dst, src []byte) {
+	cryptBlock(subkeys, dst, src, true)
 }
 
 // DES Feistel function
 func feistel(right uint32, key uint64) (result uint32) {
-	rightExpanded := permuteBlock(uint32ToBytes(right), expansionFunction[:])
-	xorResult := key ^ rightExpanded
+	sBoxLocations := key ^ permuteBlock(uint64(right), expansionFunction[:])
 	var sBoxResult uint32
 	for i := uint8(0); i < 8; i++ {
-		sBoxCoordValue := uint8((xorResult << (16 + (6 * i))) >> 58)
-		// determine the proper S-box row and column from the 6-bits of
-		// sBoxCoordValue row is determined by 1st and 6th bit
-		row := (sBoxCoordValue & 0x1) | ((sBoxCoordValue & 0x20) >> 4)
+		sBoxLocation := uint8(sBoxLocations>>42) & 0x3f
+		sBoxLocations <<= 6
+		// row determined by 1st and 6th bit
+		row := (sBoxLocation & 0x1) | ((sBoxLocation & 0x20) >> 4)
 		// column is middle four bits
-		column := (sBoxCoordValue << 3) >> 4
+		column := (sBoxLocation >> 1) & 0xf
 		sBoxResult |= uint32(sBoxes[i][row][column]) << (4 * (7 - i))
 	}
-	return uint32(permuteBlock(uint32ToBytes(sBoxResult), permutationFunction[0:]))
+	return uint32(permuteBlock(uint64(sBoxResult), permutationFunction[:]))
 }
 
 // general purpose function to perform DES block permutations
-func permuteBlock(src []byte, permutation []uint8) (block uint64) {
-	for finalPosition, bitNumber := range permutation {
-		bitIndex := bitNumber - 1
-		byteIndex := bitIndex >> 3
-		bitNumberInByte := bitIndex % 8
-		bitValue := (src[byteIndex] << bitNumberInByte) >> 7
-		block |= uint64(bitValue) << uint64((uint8(len(permutation)-1))-uint8(finalPosition))
+func permuteBlock(src uint64, permutation []uint8) (block uint64) {
+	for position, n := range permutation {
+		bit := (src >> n) & 1
+		block |= bit << uint((len(permutation)-1)-position)
 	}
 	return
 }
@@ -87,18 +70,19 @@ func ksRotate(in uint32) (out []uint32) {
 	last := in
 	for i := 0; i < 16; i++ {
 		// 28-bit circular left shift
-		part1 := (last << (4 + uint32(ksRotations[i]))) >> 4
-		part2 := (last << 4) >> (32 - ksRotations[i])
-		out[i] = part1 | part2
+		left := (last << (4 + ksRotations[i])) >> 4
+		right := (last << 4) >> (32 - ksRotations[i])
+		out[i] = left | right
 		last = out[i]
 	}
 	return
 }
 
 // creates 16 56-bit subkeys from the original key
-func ksGenerateSubkeys(cipher *DESCipher) {
+func (c *Cipher) generateSubkeys(keyBytes []byte) {
 	// apply PC1 permutation to key
-	permutedKey := permuteBlock(cipher.key, permutedChoice1[0:])
+	key := binary.BigEndian.Uint64(keyBytes)
+	permutedKey := permuteBlock(key, permutedChoice1[:])
 
 	// rotate halves of permuted key according to the rotation schedule
 	leftRotations := ksRotate(uint32(permutedKey >> 28))
@@ -109,22 +93,6 @@ func ksGenerateSubkeys(cipher *DESCipher) {
 		// combine halves to form 56-bit input to PC2
 		pc2Input := uint64(leftRotations[i])<<28 | uint64(rightRotations[i])
 		// apply PC2 permutation to 7 byte input
-		cipher.subkeys[i] = permuteBlock(uint64ToBytes(pc2Input)[1:], permutedChoice2[0:])
+		c.subkeys[i] = permuteBlock(pc2Input, permutedChoice2[:])
 	}
 }
-
-// generates a byte array from uint32 input
-func uint32ToBytes(block uint32) []byte {
-	return []byte{
-		byte(block >> 24), byte(block >> 16),
-		byte(block >> 8), byte(block)}
-}
-
-// generates a byte array from uint64 input
-func uint64ToBytes(block uint64) []byte {
-	return []byte{
-		byte(block >> 56), byte(block >> 48),
-		byte(block >> 40), byte(block >> 32),
-		byte(block >> 24), byte(block >> 16),
-		byte(block >> 8), byte(block)}
-}

src/pkg/crypto/des/cipher.go

-// Copyright 2010 The Go Authors. All rights reserved.
+// Copyright 2011 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
@@ -18,42 +18,37 @@ func (k KeySizeError) String() string {
 	return "crypto/des: invalid key size " + strconv.Itoa(int(k))
 }
 
-// A DESCipher is an instance of DES encryption.
-type DESCipher struct {
-	key     []byte
+// Cipher is an instance of DES encryption.
+type Cipher struct {
 	subkeys [16]uint64
 }
 
 // NewCipher creates and returns a new Cipher.
-func NewDESCipher(key []byte) (*DESCipher, os.Error) {
-	k := len(key)
-	if k != 8 {
-		return nil, KeySizeError(k)
+func NewCipher(key []byte) (*Cipher, os.Error) {
+	if len(key) != 8 {
+		return nil, KeySizeError(len(key))
 	}
 
-	c := &DESCipher{key, [16]uint64{}}
-	ksGenerateSubkeys(c)
+	c := new(Cipher)
+	c.generateSubkeys(key)
 	return c, nil
 }
 
 // BlockSize returns the DES block size, 8 bytes.
-func (c *DESCipher) BlockSize() int { return BlockSize }
+func (c *Cipher) BlockSize() int { return BlockSize }
 
 // Encrypts the 8-byte buffer src and stores the result in dst.
 // Note that for amounts of data larger than a block,
 // it is not safe to just call Encrypt on successive blocks;
 // instead, use an encryption mode like CBC (see crypto/cipher/cbc.go).
-func (c *DESCipher) Encrypt(dst, src []byte) { encryptBlock(c.subkeys, dst, src) }
+func (c *Cipher) Encrypt(dst, src []byte) { encryptBlock(c.subkeys[:], dst, src) }
 
 // Decrypts the 8-byte buffer src and stores the result in dst.
-func (c *DESCipher) Decrypt(dst, src []byte) { decryptBlock(c.subkeys, dst, src) }
+func (c *Cipher) Decrypt(dst, src []byte) { decryptBlock(c.subkeys[:], dst, src) }
 
 // Reset zeros the key data, so that it will no longer
 // appear in the process's memory.
-func (c *DESCipher) Reset() {
-	for i := 0; i < len(c.key); i++ {
-		c.key[i] = 0
-	}
+func (c *Cipher) Reset() {
 	for i := 0; i < len(c.subkeys); i++ {
 		c.subkeys[i] = 0
 	}
@@ -61,21 +56,19 @@ func (c *DESCipher) Reset() {
 
 // A TripleDESCipher is an instance of TripleDES encryption.
 type TripleDESCipher struct {
-	key                       []byte
-	cipher1, cipher2, cipher3 *DESCipher
+	cipher1, cipher2, cipher3 Cipher
 }
 
 // NewCipher creates and returns a new Cipher.
 func NewTripleDESCipher(key []byte) (*TripleDESCipher, os.Error) {
-	k := len(key)
-	if k != 24 {
-		return nil, KeySizeError(k)
+	if len(key) != 24 {
+		return nil, KeySizeError(len(key))
 	}
 
-	cipher1, _ := NewDESCipher(key[0:8])
-	cipher2, _ := NewDESCipher(key[8:16])
-	cipher3, _ := NewDESCipher(key[16:])
-	c := &TripleDESCipher{key, cipher1, cipher2, cipher3}
+	c := new(TripleDESCipher)
+	c.cipher1.generateSubkeys(key[:8])
+	c.cipher2.generateSubkeys(key[8:16])
+	c.cipher3.generateSubkeys(key[16:])
 	return c, nil
 }
 
@@ -104,9 +97,6 @@ func (c *TripleDESCipher) Decrypt(dst, src []byte) {
 // Reset zeros the key data, so that it will no longer
 // appear in the process's memory.
 func (c *TripleDESCipher) Reset() {
-	for i := 0; i < len(c.key); i++ {
-		c.key[i] = 0
-	}
 	c.cipher1.Reset()
 	c.cipher2.Reset()
 	c.cipher3.Reset()

src/pkg/crypto/des/const.go

@@ -7,132 +7,133 @@
 // in U.S. Federal Information Processing Standards Publication 46-3.
 package des
 
-// Used to perform an initial permutation of a
-// 64-bit input block
-var initialPermutation = [64]uint8{
-	58, 50, 42, 34, 26, 18, 10, 2,
-	60, 52, 44, 36, 28, 20, 12, 4,
-	62, 54, 46, 38, 30, 22, 14, 6,
-	64, 56, 48, 40, 32, 24, 16, 8,
-	57, 49, 41, 33, 25, 17, 9, 1,
-	59, 51, 43, 35, 27, 19, 11, 3,
-	61, 53, 45, 37, 29, 21, 13, 5,
-	63, 55, 47, 39, 31, 23, 15, 7}
+// Used to perform an initial permutation of a 64-bit input block.
+var initialPermutation = [64]byte{
+	6, 14, 22, 30, 38, 46, 54, 62,
+	4, 12, 20, 28, 36, 44, 52, 60,
+	2, 10, 18, 26, 34, 42, 50, 58,
+	0, 8, 16, 24, 32, 40, 48, 56,
+	7, 15, 23, 31, 39, 47, 55, 63,
+	5, 13, 21, 29, 37, 45, 53, 61,
+	3, 11, 19, 27, 35, 43, 51, 59,
+	1, 9, 17, 25, 33, 41, 49, 57,
+}
 
-// Used to perform a final permutation of a
-// 64-bit preoutput block
-// This is the inverse of initialPermutation
-var finalPermutation = [64]uint8{
-	40, 8, 48, 16, 56, 24, 64, 32,
-	39, 7, 47, 15, 55, 23, 63, 31,
-	38, 6, 46, 14, 54, 22, 62, 30,
-	37, 5, 45, 13, 53, 21, 61, 29,
-	36, 4, 44, 12, 52, 20, 60, 28,
-	35, 3, 43, 11, 51, 19, 59, 27,
-	34, 2, 42, 10, 50, 18, 58, 26,
-	33, 1, 41, 9, 49, 17, 57, 25}
+// Used to perform a final permutation of a 4-bit preoutput block. This is the
+// inverse of initialPermutation
+var finalPermutation = [64]byte{
+	24, 56, 16, 48, 8, 40, 0, 32,
+	25, 57, 17, 49, 9, 41, 1, 33,
+	26, 58, 18, 50, 10, 42, 2, 34,
+	27, 59, 19, 51, 11, 43, 3, 35,
+	28, 60, 20, 52, 12, 44, 4, 36,
+	29, 61, 21, 53, 13, 45, 5, 37,
+	30, 62, 22, 54, 14, 46, 6, 38,
+	31, 63, 23, 55, 15, 47, 7, 39,
+}
 
-// Used to expand an input block of 32 bits,
-// producing an output block of 48 bits.
-var expansionFunction = [48]uint8{
-	32, 1, 2, 3, 4, 5,
-	4, 5, 6, 7, 8, 9,
-	8, 9, 10, 11, 12, 13,
-	12, 13, 14, 15, 16, 17,
-	16, 17, 18, 19, 20, 21,
-	20, 21, 22, 23, 24, 25,
-	24, 25, 26, 27, 28, 29,
-	28, 29, 30, 31, 32, 1}
+// Used to expand an input block of 32 bits, producing an output block of 48
+// bits.
+var expansionFunction = [48]byte{
+	0, 31, 30, 29, 28, 27, 28, 27,
+	26, 25, 24, 23, 24, 23, 22, 21,
+	20, 19, 20, 19, 18, 17, 16, 15,
+	16, 15, 14, 13, 12, 11, 12, 11,
+	10, 9, 8, 7, 8, 7, 6, 5,
+	4, 3, 4, 3, 2, 1, 0, 31,
+}
 
 // Yields a 32-bit output from a 32-bit input
-var permutationFunction = [32]uint8{
-	16, 7, 20, 21,
-	29, 12, 28, 17,
-	1, 15, 23, 26,
-	5, 18, 31, 10,
-	2, 8, 24, 14,
-	32, 27, 3, 9,
-	19, 13, 30, 6,
-	22, 11, 4, 25}
+var permutationFunction = [32]byte{
+	16, 25, 12, 11, 3, 20, 4, 15,
+	31, 17, 9, 6, 27, 14, 1, 22,
+	30, 24, 8, 18, 0, 5, 29, 23,
+	13, 19, 2, 26, 10, 21, 28, 7,
+}
 
 // Used in the key schedule to select 56 bits
 // from a 64-bit input.
-var permutedChoice1 = [56]uint8{
-	// left
-	57, 49, 41, 33, 25, 17, 9,
-	1, 58, 50, 42, 34, 26, 18,
-	10, 2, 59, 51, 43, 35, 27,
-	19, 11, 3, 60, 52, 44, 36,
-	// right
-	63, 55, 47, 39, 31, 23, 15,
-	7, 62, 54, 46, 38, 30, 22,
-	14, 6, 61, 53, 45, 37, 29,
-	21, 13, 5, 28, 20, 12, 4}
+var permutedChoice1 = [56]byte{
+	7, 15, 23, 31, 39, 47, 55, 63,
+	6, 14, 22, 30, 38, 46, 54, 62,
+	5, 13, 21, 29, 37, 45, 53, 61,
+	4, 12, 20, 28, 1, 9, 17, 25,
+	33, 41, 49, 57, 2, 10, 18, 26,
+	34, 42, 50, 58, 3, 11, 19, 27,
+	35, 43, 51, 59, 36, 44, 52, 60,
+}
 
-// Used in the key schedule to produce
-// each subkey by selecting 48 bits
-// from the 56-bit input
-var permutedChoice2 = [48]uint8{
-	14, 17, 11, 24, 1, 5,
-	3, 28, 15, 6, 21, 10,
-	23, 19, 12, 4, 26, 8,
-	16, 7, 27, 20, 13, 2,
-	41, 52, 31, 37, 47, 55,
-	30, 40, 51, 45, 33, 48,
-	44, 49, 39, 56, 34, 53,
-	46, 42, 50, 36, 29, 32}
+// Used in the key schedule to produce each subkey by selecting 48 bits from
+// the 56-bit input
+var permutedChoice2 = [48]byte{
+	42, 39, 45, 32, 55, 51, 53, 28,
+	41, 50, 35, 46, 33, 37, 44, 52,
+	30, 48, 40, 49, 29, 36, 43, 54,
+	15, 4, 25, 19, 9, 1, 26, 16,
+	5, 11, 23, 8, 12, 7, 17, 0,
+	22, 3, 10, 14, 6, 20, 27, 24,
+}
 
 // 8 S-boxes composed of 4 rows and 16 columns
 // Used in the DES cipher function
 var sBoxes = [8][4][16]uint8{
 	// S-box 1
 	{
-		[16]uint8{14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7},
-		[16]uint8{0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8},
-		[16]uint8{4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0},
-		[16]uint8{15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13}},
+		{14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7},
+		{0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8},
+		{4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0},
+		{15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13},
+	},
 	// S-box 2
 	{
-		[16]uint8{15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10},
-		[16]uint8{3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5},
-		[16]uint8{0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15},
-		[16]uint8{13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9}},
+		{15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10},
+		{3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5},
+		{0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15},
+		{13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9},
+	},
 	// S-box 3
 	{
-		[16]uint8{10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8},
-		[16]uint8{13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1},
-		[16]uint8{13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7},
-		[16]uint8{1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12}},
+		{10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8},
+		{13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1},
+		{13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7},
+		{1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12},
+	},
 	// S-box 4
 	{
-		[16]uint8{7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15},
-		[16]uint8{13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9},
-		[16]uint8{10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4},
-		[16]uint8{3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14}},
+		{7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15},
+		{13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9},
+		{10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4},
+		{3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14},
+	},
 	// S-box 5
 	{
-		[16]uint8{2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9},
-		[16]uint8{14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6},
-		[16]uint8{4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14},
-		[16]uint8{11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3}},
+		{2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9},
+		{14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6},
+		{4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14},
+		{11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3},
+	},
 	// S-box 6
 	{
-		[16]uint8{12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11},
-		[16]uint8{10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8},
-		[16]uint8{9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6},
-		[16]uint8{4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13}},
+		{12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11},
+		{10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8},
+		{9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6},
+		{4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13},
+	},
 	// S-box 7
 	{
-		[16]uint8{4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1},
-		[16]uint8{13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6},
-		[16]uint8{1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2},
-		[16]uint8{6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12}},
+		{4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1},
+		{13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6},
+		{1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2},
+		{6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12},
+	},
 	// S-box 8
 	{
-		[16]uint8{13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7},
-		[16]uint8{1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2},
-		[16]uint8{7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8},
-		[16]uint8{2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11}}}
+		{13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7},
+		{1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2},
+		{7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8},
+		{2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11},
+	},
+}
 
 // Size of left rotation per round in each half of the key schedule
 var ksRotations = [16]uint8{1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1}