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aria.go
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package krcrypt
import "crypto/cipher"
// The ARIA Block cipher from KISA
// Copyright (c) 2012 Damian Gryski <[email protected]>
// Licensed under the MIT License
// The cipher operates on 128-bit items, but some pieces are in bytes.
// This entire implementation is based around byte, but we should perhaps switch to larger (32-bit?) items.
/*
References:
http://210.104.33.10/ARIA/index-e.html
http://tools.ietf.org/html/rfc5794
http://seed.kisa.or.kr/kor/aria/aria.jsp
*/
// An ariaCipher is an instance of ARIA encryption using a particular key
type ariaCipher struct {
ek [17][16]byte // encryption subkeys
dk [17][16]byte // decryption subkeys
rounds int // how many rounds
}
// constants for key whitening
var (
c1 = []byte{0x51, 0x7c, 0xc1, 0xb7, 0x27, 0x22, 0x0a, 0x94, 0xfe, 0x13, 0xab, 0xe8, 0xfa, 0x9a, 0x6e, 0xe0}
c2 = []byte{0x6d, 0xb1, 0x4a, 0xcc, 0x9e, 0x21, 0xc8, 0x20, 0xff, 0x28, 0xb1, 0xd5, 0xef, 0x5d, 0xe2, 0xb0}
c3 = []byte{0xdb, 0x92, 0x37, 0x1d, 0x21, 0x26, 0xe9, 0x70, 0x03, 0x24, 0x97, 0x75, 0x04, 0xe8, 0xc9, 0x0e}
)
// rotate a slice of 16 bytes right by 'count' bits. The output goes in 'o'
func rotrslice(o, b []byte, count int) []byte {
bitrot := uint(count % 8)
byterot := count / 8
for i := 0; i < 16; i++ {
o[i] = 0
}
for i := range b {
oi := (i + byterot) % 16
oi1 := (i + byterot + 1) % 16
o[oi] = (o[oi] & (0xff << (8 - bitrot))) | (b[i] >> bitrot)
o[oi1] = (o[oi1] & (0xff >> bitrot)) | (b[i] << (8 - bitrot))
}
return o
}
// rotate a slice of 16 bytes left by 'count' bits. The output goes in 'o'
func rotlslice(o, b []byte, count int) []byte {
return rotrslice(o, b, (16*8)-count)
}
// xor two slices: o = a ^ b
func xorslice(o, a, b []byte) {
for i := 0; i < len(o); i++ {
o[i] = a[i] ^ b[i]
}
}
// NewARIA creates and returns a cipher.Block implementing ARIA.
// The key argument should be 16/24/32 bytes.
func NewARIA(key []byte) (cipher.Block, error) {
c := new(ariaCipher)
var ck1, ck2, ck3 []byte
switch len(key) {
case 16:
c.rounds = 12
ck1, ck2, ck3 = c1, c2, c3
case 24:
c.rounds = 14
ck1, ck2, ck3 = c2, c3, c1
case 32:
c.rounds = 16
ck1, ck2, ck3 = c3, c1, c2
default:
return nil, KeySizeError(len(key))
}
kr := make([]byte, 16)
kl := make([]byte, 16)
copy(kl, key[0:16])
copy(kr, key[16:])
// key whitening
w0 := make([]byte, 16)
w1 := make([]byte, 16)
w2 := make([]byte, 16)
w3 := make([]byte, 16)
copy(w0, kl)
fo(w1, w0, ck1)
xorslice(w1, w1, kr)
fe(w2, w1, ck2)
xorslice(w2, w2, w0)
fo(w3, w2, ck3)
xorslice(w3, w3, w1)
out := make([]byte, 16)
// create subkeys
xorslice(c.ek[0][:], w0, rotrslice(out, w1, 19))
xorslice(c.ek[1][:], w1, rotrslice(out, w2, 19))
xorslice(c.ek[2][:], w2, rotrslice(out, w3, 19))
xorslice(c.ek[3][:], w3, rotrslice(out, w0, 19))
xorslice(c.ek[4][:], w0, rotrslice(out, w1, 31))
xorslice(c.ek[5][:], w1, rotrslice(out, w2, 31))
xorslice(c.ek[6][:], w2, rotrslice(out, w3, 31))
xorslice(c.ek[7][:], w3, rotrslice(out, w0, 31))
xorslice(c.ek[8][:], w0, rotlslice(out, w1, 61))
xorslice(c.ek[9][:], w1, rotlslice(out, w2, 61))
xorslice(c.ek[10][:], w2, rotlslice(out, w3, 61))
xorslice(c.ek[11][:], w3, rotlslice(out, w0, 61))
xorslice(c.ek[12][:], w0, rotlslice(out, w1, 31))
if c.rounds > 12 {
xorslice(c.ek[13][:], w1, rotlslice(out, w2, 31))
xorslice(c.ek[14][:], w2, rotlslice(out, w3, 31))
}
if c.rounds > 14 {
xorslice(c.ek[15][:], w3, rotlslice(out, w0, 31))
xorslice(c.ek[16][:], w0, rotlslice(out, w1, 19))
}
// decryption subkeys
copy(c.dk[0][:], c.ek[c.rounds][:])
for i := 1; i < c.rounds; i++ {
a(c.dk[i][:], c.ek[c.rounds-i][:])
}
copy(c.dk[c.rounds][:], c.ek[0][:])
return c, nil
}
func (c *ariaCipher) BlockSize() int { return 16 }
func (c *ariaCipher) Encrypt(dst, src []byte) { process(dst, src, c.ek[:], c.rounds) }
func (c *ariaCipher) Decrypt(dst, src []byte) { process(dst, src, c.dk[:], c.rounds) }
// the main crypter function, shared between encryption and decryption.
// only the round keys are different
func process(dst, src []byte, rk [][16]byte, rounds int) {
var out [16]byte
fo(out[:], src, rk[0][:])
fe(out[:], out[:], rk[1][:])
fo(out[:], out[:], rk[2][:])
fe(out[:], out[:], rk[3][:])
fo(out[:], out[:], rk[4][:])
fe(out[:], out[:], rk[5][:])
fo(out[:], out[:], rk[6][:])
fe(out[:], out[:], rk[7][:])
fo(out[:], out[:], rk[8][:])
fe(out[:], out[:], rk[9][:])
fo(out[:], out[:], rk[10][:])
if rounds > 12 {
fe(out[:], out[:], rk[11][:])
fo(out[:], out[:], rk[12][:])
}
if rounds > 14 {
fe(out[:], out[:], rk[13][:])
fo(out[:], out[:], rk[14][:])
}
// final round
xorslice(out[:], rk[rounds-1][:], out[:])
sl2(out[:], out[:])
xorslice(dst, out[:], rk[rounds][:])
}
// round function for odd rounds
func fo(out, d, rk []byte) {
var o [16]byte
xorslice(o[:], d, rk)
sl1(o[:], o[:])
a(out, o[:])
}
// round function for even rounds
func fe(out, d, rk []byte) {
var o [16]byte
xorslice(o[:], d, rk)
sl2(o[:], o[:])
a(out, o[:])
}
// substitution layer
func sl1(y, x []byte) {
y[0] = sb1[x[0]]
y[1] = sb2[x[1]]
y[2] = sb3[x[2]]
y[3] = sb4[x[3]]
y[4] = sb1[x[4]]
y[5] = sb2[x[5]]
y[6] = sb3[x[6]]
y[7] = sb4[x[7]]
y[8] = sb1[x[8]]
y[9] = sb2[x[9]]
y[10] = sb3[x[10]]
y[11] = sb4[x[11]]
y[12] = sb1[x[12]]
y[13] = sb2[x[13]]
y[14] = sb3[x[14]]
y[15] = sb4[x[15]]
}
func sl2(y, x []byte) {
y[0] = sb3[x[0]]
y[1] = sb4[x[1]]
y[2] = sb1[x[2]]
y[3] = sb2[x[3]]
y[4] = sb3[x[4]]
y[5] = sb4[x[5]]
y[6] = sb1[x[6]]
y[7] = sb2[x[7]]
y[8] = sb3[x[8]]
y[9] = sb4[x[9]]
y[10] = sb1[x[10]]
y[11] = sb2[x[11]]
y[12] = sb3[x[12]]
y[13] = sb4[x[13]]
y[14] = sb1[x[14]]
y[15] = sb2[x[15]]
}
// diffusion layer
func a(y, x []byte) {
y[0] = x[3] ^ x[4] ^ x[6] ^ x[8] ^ x[9] ^ x[13] ^ x[14]
y[1] = x[2] ^ x[5] ^ x[7] ^ x[8] ^ x[9] ^ x[12] ^ x[15]
y[2] = x[1] ^ x[4] ^ x[6] ^ x[10] ^ x[11] ^ x[12] ^ x[15]
y[3] = x[0] ^ x[5] ^ x[7] ^ x[10] ^ x[11] ^ x[13] ^ x[14]
y[4] = x[0] ^ x[2] ^ x[5] ^ x[8] ^ x[11] ^ x[14] ^ x[15]
y[5] = x[1] ^ x[3] ^ x[4] ^ x[9] ^ x[10] ^ x[14] ^ x[15]
y[6] = x[0] ^ x[2] ^ x[7] ^ x[9] ^ x[10] ^ x[12] ^ x[13]
y[7] = x[1] ^ x[3] ^ x[6] ^ x[8] ^ x[11] ^ x[12] ^ x[13]
y[8] = x[0] ^ x[1] ^ x[4] ^ x[7] ^ x[10] ^ x[13] ^ x[15]
y[9] = x[0] ^ x[1] ^ x[5] ^ x[6] ^ x[11] ^ x[12] ^ x[14]
y[10] = x[2] ^ x[3] ^ x[5] ^ x[6] ^ x[8] ^ x[13] ^ x[15]
y[11] = x[2] ^ x[3] ^ x[4] ^ x[7] ^ x[9] ^ x[12] ^ x[14]
y[12] = x[1] ^ x[2] ^ x[6] ^ x[7] ^ x[9] ^ x[11] ^ x[12]
y[13] = x[0] ^ x[3] ^ x[6] ^ x[7] ^ x[8] ^ x[10] ^ x[13]
y[14] = x[0] ^ x[3] ^ x[4] ^ x[5] ^ x[9] ^ x[11] ^ x[14]
y[15] = x[1] ^ x[2] ^ x[4] ^ x[5] ^ x[8] ^ x[10] ^ x[15]
}
// s-boxes, converted from the RFC
var sb1 = [...]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 sb2 = [...]byte{
0xe2, 0x4e, 0x54, 0xfc, 0x94, 0xc2, 0x4a, 0xcc, 0x62, 0x0d, 0x6a, 0x46, 0x3c, 0x4d, 0x8b, 0xd1,
0x5e, 0xfa, 0x64, 0xcb, 0xb4, 0x97, 0xbe, 0x2b, 0xbc, 0x77, 0x2e, 0x03, 0xd3, 0x19, 0x59, 0xc1,
0x1d, 0x06, 0x41, 0x6b, 0x55, 0xf0, 0x99, 0x69, 0xea, 0x9c, 0x18, 0xae, 0x63, 0xdf, 0xe7, 0xbb,
0x00, 0x73, 0x66, 0xfb, 0x96, 0x4c, 0x85, 0xe4, 0x3a, 0x09, 0x45, 0xaa, 0x0f, 0xee, 0x10, 0xeb,
0x2d, 0x7f, 0xf4, 0x29, 0xac, 0xcf, 0xad, 0x91, 0x8d, 0x78, 0xc8, 0x95, 0xf9, 0x2f, 0xce, 0xcd,
0x08, 0x7a, 0x88, 0x38, 0x5c, 0x83, 0x2a, 0x28, 0x47, 0xdb, 0xb8, 0xc7, 0x93, 0xa4, 0x12, 0x53,
0xff, 0x87, 0x0e, 0x31, 0x36, 0x21, 0x58, 0x48, 0x01, 0x8e, 0x37, 0x74, 0x32, 0xca, 0xe9, 0xb1,
0xb7, 0xab, 0x0c, 0xd7, 0xc4, 0x56, 0x42, 0x26, 0x07, 0x98, 0x60, 0xd9, 0xb6, 0xb9, 0x11, 0x40,
0xec, 0x20, 0x8c, 0xbd, 0xa0, 0xc9, 0x84, 0x04, 0x49, 0x23, 0xf1, 0x4f, 0x50, 0x1f, 0x13, 0xdc,
0xd8, 0xc0, 0x9e, 0x57, 0xe3, 0xc3, 0x7b, 0x65, 0x3b, 0x02, 0x8f, 0x3e, 0xe8, 0x25, 0x92, 0xe5,
0x15, 0xdd, 0xfd, 0x17, 0xa9, 0xbf, 0xd4, 0x9a, 0x7e, 0xc5, 0x39, 0x67, 0xfe, 0x76, 0x9d, 0x43,
0xa7, 0xe1, 0xd0, 0xf5, 0x68, 0xf2, 0x1b, 0x34, 0x70, 0x05, 0xa3, 0x8a, 0xd5, 0x79, 0x86, 0xa8,
0x30, 0xc6, 0x51, 0x4b, 0x1e, 0xa6, 0x27, 0xf6, 0x35, 0xd2, 0x6e, 0x24, 0x16, 0x82, 0x5f, 0xda,
0xe6, 0x75, 0xa2, 0xef, 0x2c, 0xb2, 0x1c, 0x9f, 0x5d, 0x6f, 0x80, 0x0a, 0x72, 0x44, 0x9b, 0x6c,
0x90, 0x0b, 0x5b, 0x33, 0x7d, 0x5a, 0x52, 0xf3, 0x61, 0xa1, 0xf7, 0xb0, 0xd6, 0x3f, 0x7c, 0x6d,
0xed, 0x14, 0xe0, 0xa5, 0x3d, 0x22, 0xb3, 0xf8, 0x89, 0xde, 0x71, 0x1a, 0xaf, 0xba, 0xb5, 0x81,
}
var sb3 = [...]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 sb4 = [...]byte{
0x30, 0x68, 0x99, 0x1b, 0x87, 0xb9, 0x21, 0x78, 0x50, 0x39, 0xdb, 0xe1, 0x72, 0x09, 0x62, 0x3c,
0x3e, 0x7e, 0x5e, 0x8e, 0xf1, 0xa0, 0xcc, 0xa3, 0x2a, 0x1d, 0xfb, 0xb6, 0xd6, 0x20, 0xc4, 0x8d,
0x81, 0x65, 0xf5, 0x89, 0xcb, 0x9d, 0x77, 0xc6, 0x57, 0x43, 0x56, 0x17, 0xd4, 0x40, 0x1a, 0x4d,
0xc0, 0x63, 0x6c, 0xe3, 0xb7, 0xc8, 0x64, 0x6a, 0x53, 0xaa, 0x38, 0x98, 0x0c, 0xf4, 0x9b, 0xed,
0x7f, 0x22, 0x76, 0xaf, 0xdd, 0x3a, 0x0b, 0x58, 0x67, 0x88, 0x06, 0xc3, 0x35, 0x0d, 0x01, 0x8b,
0x8c, 0xc2, 0xe6, 0x5f, 0x02, 0x24, 0x75, 0x93, 0x66, 0x1e, 0xe5, 0xe2, 0x54, 0xd8, 0x10, 0xce,
0x7a, 0xe8, 0x08, 0x2c, 0x12, 0x97, 0x32, 0xab, 0xb4, 0x27, 0x0a, 0x23, 0xdf, 0xef, 0xca, 0xd9,
0xb8, 0xfa, 0xdc, 0x31, 0x6b, 0xd1, 0xad, 0x19, 0x49, 0xbd, 0x51, 0x96, 0xee, 0xe4, 0xa8, 0x41,
0xda, 0xff, 0xcd, 0x55, 0x86, 0x36, 0xbe, 0x61, 0x52, 0xf8, 0xbb, 0x0e, 0x82, 0x48, 0x69, 0x9a,
0xe0, 0x47, 0x9e, 0x5c, 0x04, 0x4b, 0x34, 0x15, 0x79, 0x26, 0xa7, 0xde, 0x29, 0xae, 0x92, 0xd7,
0x84, 0xe9, 0xd2, 0xba, 0x5d, 0xf3, 0xc5, 0xb0, 0xbf, 0xa4, 0x3b, 0x71, 0x44, 0x46, 0x2b, 0xfc,
0xeb, 0x6f, 0xd5, 0xf6, 0x14, 0xfe, 0x7c, 0x70, 0x5a, 0x7d, 0xfd, 0x2f, 0x18, 0x83, 0x16, 0xa5,
0x91, 0x1f, 0x05, 0x95, 0x74, 0xa9, 0xc1, 0x5b, 0x4a, 0x85, 0x6d, 0x13, 0x07, 0x4f, 0x4e, 0x45,
0xb2, 0x0f, 0xc9, 0x1c, 0xa6, 0xbc, 0xec, 0x73, 0x90, 0x7b, 0xcf, 0x59, 0x8f, 0xa1, 0xf9, 0x2d,
0xf2, 0xb1, 0x00, 0x94, 0x37, 0x9f, 0xd0, 0x2e, 0x9c, 0x6e, 0x28, 0x3f, 0x80, 0xf0, 0x3d, 0xd3,
0x25, 0x8a, 0xb5, 0xe7, 0x42, 0xb3, 0xc7, 0xea, 0xf7, 0x4c, 0x11, 0x33, 0x03, 0xa2, 0xac, 0x60,
}