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aria.go
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aria.go
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package aria
import (
"fmt"
"crypto/cipher"
"github.com/deatil/go-cryptobin/tool/alias"
)
const BlockSize = 16
// KeySizeError is returned when key size in bytes
// isn't one of 16, 24, or 32.
type KeySizeError int
func (k KeySizeError) Error() string {
return fmt.Sprintf("cryptobin/aria: invalid key size %d", int(k))
}
type ariaCipher struct {
k int // Key size in bytes.
enc []uint32
dec []uint32
}
// NewCipher creates and returns a new cipher.Block.
// The key argument should be the ARIA key,
// either 16, 24, or 32 bytes to select
// ARIA-128, ARIA-192, or ARIA-256.
func NewCipher(key []byte) (cipher.Block, error) {
k := len(key)
switch k {
case 16, 24, 32:
break
default:
return nil, KeySizeError(k)
}
c := new(ariaCipher)
c.expandKey(key)
return c, nil
}
func (c *ariaCipher) BlockSize() int {
return BlockSize
}
func (c *ariaCipher) Encrypt(dst, src []byte) {
if len(src) < BlockSize {
panic("cryptobin/aria: input not full block")
}
if len(dst) < BlockSize {
panic("cryptobin/aria: output not full block")
}
if alias.InexactOverlap(dst[:BlockSize], src[:BlockSize]) {
panic("cryptobin/aria: invalid buffer overlap")
}
c.cryptBlock(dst, src, c.enc)
}
func (c *ariaCipher) Decrypt(dst, src []byte) {
if len(src) < BlockSize {
panic("cryptobin/aria: input not full block")
}
if len(dst) < BlockSize {
panic("cryptobin/aria: output not full block")
}
if alias.InexactOverlap(dst[:BlockSize], src[:BlockSize]) {
panic("cryptobin/aria: invalid buffer overlap")
}
c.cryptBlock(dst, src, c.dec)
}
func (c *ariaCipher) rounds() int {
return c.k/4 + 8
}
func (c *ariaCipher) cryptBlock(dst, src []byte, xk []uint32) {
n := c.rounds()
var p [16]byte
copy(p[:], src[:BlockSize])
for i := 1; i <= n-1; i++ {
if i&1 == 1 {
p = roundOdd(p, toBytes(xk[(i-1)*4:i*4]))
} else {
p = roundEven(p, toBytes(xk[(i-1)*4:i*4]))
}
}
p = xor(substitute2(xor(p, toBytes(xk[(n-1)*4:n*4]))), toBytes(xk[n*4:(n+1)*4]))
copy(dst[:BlockSize], p[:])
}
func (c *ariaCipher) expandKey(key []byte) {
k := len(key)
n := k + 36
c.k = k
c.enc = make([]uint32, n)
c.dec = make([]uint32, n)
c.keyRound(key)
}
func (c *ariaCipher) keyRound(key []byte) {
n := c.rounds()
var kl, kr [16]byte
for i := 0; i < c.k; i++ {
if i < 16 {
kl[i] = key[i]
} else {
kr[i-16] = key[i]
}
}
var ck1, ck2, ck3 [16]byte
switch c.k {
case 128 / 8:
ck1 = c1
ck2 = c2
ck3 = c3
case 192 / 8:
ck1 = c2
ck2 = c3
ck3 = c1
case 256 / 8:
ck1 = c3
ck2 = c1
ck3 = c2
}
var w0, w1, w2, w3 [16]byte
w0 = kl
w1 = xor(roundOdd(w0, ck1), kr)
w2 = xor(roundEven(w1, ck2), w0)
w3 = xor(roundOdd(w2, ck3), w1)
copyBytes(c.enc, xor(w0, rrot(w1, 19)))
copyBytes(c.enc[4:], xor(w1, rrot(w2, 19)))
copyBytes(c.enc[8:], xor(w2, rrot(w3, 19)))
copyBytes(c.enc[12:], xor(w3, rrot(w0, 19)))
copyBytes(c.enc[16:], xor(w0, rrot(w1, 31)))
copyBytes(c.enc[20:], xor(w1, rrot(w2, 31)))
copyBytes(c.enc[24:], xor(w2, rrot(w3, 31)))
copyBytes(c.enc[28:], xor(w3, rrot(w0, 31)))
copyBytes(c.enc[32:], xor(w0, lrot(w1, 61)))
copyBytes(c.enc[36:], xor(w1, lrot(w2, 61)))
copyBytes(c.enc[40:], xor(w2, lrot(w3, 61)))
copyBytes(c.enc[44:], xor(w3, lrot(w0, 61)))
copyBytes(c.enc[48:], xor(w0, lrot(w1, 31)))
if n > 12 {
copyBytes(c.enc[52:], xor(w1, lrot(w2, 31)))
copyBytes(c.enc[56:], xor(w2, lrot(w3, 31)))
}
if n > 14 {
copyBytes(c.enc[60:], xor(w3, lrot(w0, 31)))
copyBytes(c.enc[64:], xor(w0, lrot(w1, 19)))
}
copy(c.dec, c.enc[n*4:(n+1)*4])
for i := 1; i <= n-1; i++ {
var t [16]byte
t = toBytes(c.enc[(n-i)*4 : (n-i+1)*4])
t = diffuse(t)
copyBytes(c.dec[i*4:], t)
}
copy(c.dec[n*4:], c.enc[:4])
}