2012-03-27 23:13:14 +00:00
|
|
|
// 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
|
|
|
|
|
2018-12-28 15:30:48 +00:00
|
|
|
import "encoding/binary"
|
2012-03-27 23:13:14 +00:00
|
|
|
|
|
|
|
func cryptBlock(subkeys []uint64, dst, src []byte, decrypt bool) {
|
|
|
|
b := binary.BigEndian.Uint64(src)
|
2014-09-21 17:33:12 +00:00
|
|
|
b = permuteInitialBlock(b)
|
2012-03-27 23:13:14 +00:00
|
|
|
left, right := uint32(b>>32), uint32(b)
|
|
|
|
|
2018-12-28 15:30:48 +00:00
|
|
|
left = (left << 1) | (left >> 31)
|
|
|
|
right = (right << 1) | (right >> 31)
|
2012-03-27 23:13:14 +00:00
|
|
|
|
2018-12-28 15:30:48 +00:00
|
|
|
if decrypt {
|
|
|
|
for i := 0; i < 8; i++ {
|
|
|
|
left, right = feistel(left, right, subkeys[15-2*i], subkeys[15-(2*i+1)])
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
for i := 0; i < 8; i++ {
|
|
|
|
left, right = feistel(left, right, subkeys[2*i], subkeys[2*i+1])
|
|
|
|
}
|
2012-03-27 23:13:14 +00:00
|
|
|
}
|
2018-12-28 15:30:48 +00:00
|
|
|
|
|
|
|
left = (left << 31) | (left >> 1)
|
|
|
|
right = (right << 31) | (right >> 1)
|
|
|
|
|
2012-03-27 23:13:14 +00:00
|
|
|
// switch left & right and perform final permutation
|
|
|
|
preOutput := (uint64(right) << 32) | uint64(left)
|
2014-09-21 17:33:12 +00:00
|
|
|
binary.BigEndian.PutUint64(dst, permuteFinalBlock(preOutput))
|
2012-03-27 23:13:14 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
// 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 []uint64, dst, src []byte) {
|
|
|
|
cryptBlock(subkeys, dst, src, true)
|
|
|
|
}
|
|
|
|
|
|
|
|
// DES Feistel function
|
2018-12-28 15:30:48 +00:00
|
|
|
func feistel(l, r uint32, k0, k1 uint64) (lout, rout uint32) {
|
|
|
|
var t uint32
|
|
|
|
|
|
|
|
t = r ^ uint32(k0>>32)
|
|
|
|
l ^= feistelBox[7][t&0x3f] ^
|
|
|
|
feistelBox[5][(t>>8)&0x3f] ^
|
|
|
|
feistelBox[3][(t>>16)&0x3f] ^
|
|
|
|
feistelBox[1][(t>>24)&0x3f]
|
|
|
|
|
|
|
|
t = ((r << 28) | (r >> 4)) ^ uint32(k0)
|
|
|
|
l ^= feistelBox[6][(t)&0x3f] ^
|
|
|
|
feistelBox[4][(t>>8)&0x3f] ^
|
|
|
|
feistelBox[2][(t>>16)&0x3f] ^
|
|
|
|
feistelBox[0][(t>>24)&0x3f]
|
|
|
|
|
|
|
|
t = l ^ uint32(k1>>32)
|
|
|
|
r ^= feistelBox[7][t&0x3f] ^
|
|
|
|
feistelBox[5][(t>>8)&0x3f] ^
|
|
|
|
feistelBox[3][(t>>16)&0x3f] ^
|
|
|
|
feistelBox[1][(t>>24)&0x3f]
|
|
|
|
|
|
|
|
t = ((l << 28) | (l >> 4)) ^ uint32(k1)
|
|
|
|
r ^= feistelBox[6][(t)&0x3f] ^
|
|
|
|
feistelBox[4][(t>>8)&0x3f] ^
|
|
|
|
feistelBox[2][(t>>16)&0x3f] ^
|
|
|
|
feistelBox[0][(t>>24)&0x3f]
|
|
|
|
|
|
|
|
return l, r
|
2012-03-27 23:13:14 +00:00
|
|
|
}
|
|
|
|
|
2014-09-21 17:33:12 +00:00
|
|
|
// feistelBox[s][16*i+j] contains the output of permutationFunction
|
|
|
|
// for sBoxes[s][i][j] << 4*(7-s)
|
|
|
|
var feistelBox [8][64]uint32
|
|
|
|
|
2012-03-27 23:13:14 +00:00
|
|
|
// general purpose function to perform DES block permutations
|
|
|
|
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
|
|
|
|
}
|
|
|
|
|
2014-09-21 17:33:12 +00:00
|
|
|
func init() {
|
|
|
|
for s := range sBoxes {
|
|
|
|
for i := 0; i < 4; i++ {
|
|
|
|
for j := 0; j < 16; j++ {
|
|
|
|
f := uint64(sBoxes[s][i][j]) << (4 * (7 - uint(s)))
|
2017-10-07 00:16:47 +00:00
|
|
|
f = permuteBlock(f, permutationFunction[:])
|
2018-12-28 15:30:48 +00:00
|
|
|
|
|
|
|
// Row is determined by the 1st and 6th bit.
|
|
|
|
// Column is the middle four bits.
|
|
|
|
row := uint8(((i & 2) << 4) | i&1)
|
|
|
|
col := uint8(j << 1)
|
|
|
|
t := row | col
|
|
|
|
|
|
|
|
// The rotation was performed in the feistel rounds, being factored out and now mixed into the feistelBox.
|
|
|
|
f = (f << 1) | (f >> 31)
|
|
|
|
|
|
|
|
feistelBox[s][t] = uint32(f)
|
2014-09-21 17:33:12 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// permuteInitialBlock is equivalent to the permutation defined
|
|
|
|
// by initialPermutation.
|
|
|
|
func permuteInitialBlock(block uint64) uint64 {
|
|
|
|
// block = b7 b6 b5 b4 b3 b2 b1 b0 (8 bytes)
|
|
|
|
b1 := block >> 48
|
|
|
|
b2 := block << 48
|
|
|
|
block ^= b1 ^ b2 ^ b1<<48 ^ b2>>48
|
|
|
|
|
|
|
|
// block = b1 b0 b5 b4 b3 b2 b7 b6
|
|
|
|
b1 = block >> 32 & 0xff00ff
|
|
|
|
b2 = (block & 0xff00ff00)
|
|
|
|
block ^= b1<<32 ^ b2 ^ b1<<8 ^ b2<<24 // exchange b0 b4 with b3 b7
|
|
|
|
|
|
|
|
// block is now b1 b3 b5 b7 b0 b2 b4 b7, the permutation:
|
|
|
|
// ... 8
|
|
|
|
// ... 24
|
|
|
|
// ... 40
|
|
|
|
// ... 56
|
|
|
|
// 7 6 5 4 3 2 1 0
|
|
|
|
// 23 22 21 20 19 18 17 16
|
|
|
|
// ... 32
|
|
|
|
// ... 48
|
|
|
|
|
|
|
|
// exchange 4,5,6,7 with 32,33,34,35 etc.
|
|
|
|
b1 = block & 0x0f0f00000f0f0000
|
|
|
|
b2 = block & 0x0000f0f00000f0f0
|
|
|
|
block ^= b1 ^ b2 ^ b1>>12 ^ b2<<12
|
|
|
|
|
|
|
|
// block is the permutation:
|
|
|
|
//
|
|
|
|
// [+8] [+40]
|
|
|
|
//
|
|
|
|
// 7 6 5 4
|
|
|
|
// 23 22 21 20
|
|
|
|
// 3 2 1 0
|
|
|
|
// 19 18 17 16 [+32]
|
|
|
|
|
|
|
|
// exchange 0,1,4,5 with 18,19,22,23
|
|
|
|
b1 = block & 0x3300330033003300
|
|
|
|
b2 = block & 0x00cc00cc00cc00cc
|
|
|
|
block ^= b1 ^ b2 ^ b1>>6 ^ b2<<6
|
|
|
|
|
|
|
|
// block is the permutation:
|
|
|
|
// 15 14
|
|
|
|
// 13 12
|
|
|
|
// 11 10
|
|
|
|
// 9 8
|
|
|
|
// 7 6
|
|
|
|
// 5 4
|
|
|
|
// 3 2
|
|
|
|
// 1 0 [+16] [+32] [+64]
|
|
|
|
|
|
|
|
// exchange 0,2,4,6 with 9,11,13,15:
|
|
|
|
b1 = block & 0xaaaaaaaa55555555
|
|
|
|
block ^= b1 ^ b1>>33 ^ b1<<33
|
|
|
|
|
|
|
|
// block is the permutation:
|
|
|
|
// 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
|
|
|
|
return block
|
|
|
|
}
|
|
|
|
|
|
|
|
// permuteInitialBlock is equivalent to the permutation defined
|
|
|
|
// by finalPermutation.
|
|
|
|
func permuteFinalBlock(block uint64) uint64 {
|
|
|
|
// Perform the same bit exchanges as permuteInitialBlock
|
|
|
|
// but in reverse order.
|
|
|
|
b1 := block & 0xaaaaaaaa55555555
|
|
|
|
block ^= b1 ^ b1>>33 ^ b1<<33
|
|
|
|
|
|
|
|
b1 = block & 0x3300330033003300
|
|
|
|
b2 := block & 0x00cc00cc00cc00cc
|
|
|
|
block ^= b1 ^ b2 ^ b1>>6 ^ b2<<6
|
|
|
|
|
|
|
|
b1 = block & 0x0f0f00000f0f0000
|
|
|
|
b2 = block & 0x0000f0f00000f0f0
|
|
|
|
block ^= b1 ^ b2 ^ b1>>12 ^ b2<<12
|
|
|
|
|
|
|
|
b1 = block >> 32 & 0xff00ff
|
|
|
|
b2 = (block & 0xff00ff00)
|
|
|
|
block ^= b1<<32 ^ b2 ^ b1<<8 ^ b2<<24
|
|
|
|
|
|
|
|
b1 = block >> 48
|
|
|
|
b2 = block << 48
|
|
|
|
block ^= b1 ^ b2 ^ b1<<48 ^ b2>>48
|
|
|
|
return block
|
|
|
|
}
|
|
|
|
|
2012-03-27 23:13:14 +00:00
|
|
|
// creates 16 28-bit blocks rotated according
|
|
|
|
// to the rotation schedule
|
|
|
|
func ksRotate(in uint32) (out []uint32) {
|
|
|
|
out = make([]uint32, 16)
|
|
|
|
last := in
|
|
|
|
for i := 0; i < 16; i++ {
|
|
|
|
// 28-bit circular left shift
|
|
|
|
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 (c *desCipher) generateSubkeys(keyBytes []byte) {
|
|
|
|
// apply PC1 permutation to key
|
|
|
|
key := binary.BigEndian.Uint64(keyBytes)
|
|
|
|
permutedKey := permuteBlock(key, permutedChoice1[:])
|
|
|
|
|
|
|
|
// rotate halves of permuted key according to the rotation schedule
|
|
|
|
leftRotations := ksRotate(uint32(permutedKey >> 28))
|
|
|
|
rightRotations := ksRotate(uint32(permutedKey<<4) >> 4)
|
|
|
|
|
|
|
|
// generate subkeys
|
|
|
|
for i := 0; i < 16; i++ {
|
|
|
|
// combine halves to form 56-bit input to PC2
|
|
|
|
pc2Input := uint64(leftRotations[i])<<28 | uint64(rightRotations[i])
|
|
|
|
// apply PC2 permutation to 7 byte input
|
2018-12-28 15:30:48 +00:00
|
|
|
c.subkeys[i] = unpack(permuteBlock(pc2Input, permutedChoice2[:]))
|
2012-03-27 23:13:14 +00:00
|
|
|
}
|
|
|
|
}
|
2018-12-28 15:30:48 +00:00
|
|
|
|
|
|
|
// Expand 48-bit input to 64-bit, with each 6-bit block padded by extra two bits at the top.
|
|
|
|
// By doing so, we can have the input blocks (four bits each), and the key blocks (six bits each) well-aligned without
|
|
|
|
// extra shifts/rotations for alignments.
|
|
|
|
func unpack(x uint64) uint64 {
|
|
|
|
var result uint64
|
|
|
|
|
|
|
|
result = ((x>>(6*1))&0xff)<<(8*0) |
|
|
|
|
((x>>(6*3))&0xff)<<(8*1) |
|
|
|
|
((x>>(6*5))&0xff)<<(8*2) |
|
|
|
|
((x>>(6*7))&0xff)<<(8*3) |
|
|
|
|
((x>>(6*0))&0xff)<<(8*4) |
|
|
|
|
((x>>(6*2))&0xff)<<(8*5) |
|
|
|
|
((x>>(6*4))&0xff)<<(8*6) |
|
|
|
|
((x>>(6*6))&0xff)<<(8*7)
|
|
|
|
|
|
|
|
return result
|
|
|
|
}
|