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e2.go
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e2.go
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package e2
import (
"fmt"
"crypto/cipher"
"github.com/deatil/go-cryptobin/tool/alias"
)
const BlockSize = 16
type KeySizeError int
func (k KeySizeError) Error() string {
return fmt.Sprintf("cryptobin/e2: invalid key size %d", int(k))
}
type e2Cipher struct {
l_key [72]uint32
}
// NewCipher creates and returns a new cipher.Block.
func NewCipher(key []byte) (cipher.Block, error) {
k := len(key)
switch k {
case 16, 24, 32:
break
default:
return nil, KeySizeError(len(key))
}
c := new(e2Cipher)
c.expandKey(key)
return c, nil
}
func (this *e2Cipher) BlockSize() int {
return BlockSize
}
func (this *e2Cipher) Encrypt(dst, src []byte) {
if len(src) < BlockSize {
panic("cryptobin/e2: input not full block")
}
if len(dst) < BlockSize {
panic("cryptobin/e2: output not full block")
}
if alias.InexactOverlap(dst[:BlockSize], src[:BlockSize]) {
panic("cryptobin/e2: invalid buffer overlap")
}
encSrc := bytesToUint32s(src)
encDst := make([]uint32, len(encSrc))
this.encrypt(encDst, encSrc)
resBytes := uint32sToBytes(encDst)
copy(dst, resBytes)
}
func (this *e2Cipher) Decrypt(dst, src []byte) {
if len(src) < BlockSize {
panic("cryptobin/e2: input not full block")
}
if len(dst) < BlockSize {
panic("cryptobin/e2: output not full block")
}
if alias.InexactOverlap(dst[:BlockSize], src[:BlockSize]) {
panic("cryptobin/e2: invalid buffer overlap")
}
encSrc := bytesToUint32s(src)
encDst := make([]uint32, len(encSrc))
this.decrypt(encDst, encSrc)
resBytes := uint32sToBytes(encDst)
copy(dst, resBytes)
}
func (this *e2Cipher) expandKey(key []byte) {
var lk [8]uint32
var v [2]uint32
var lout [8]uint32
var i, j, k, w uint32
in_key := bytesToUint32s(key)
key_len := uint32(len(key)) * 8
v[0] = bswap(v_0)
v[1] = bswap(v_1)
lk[0] = io_swap(in_key[0])
lk[1] = io_swap(in_key[1])
lk[2] = io_swap(in_key[2])
lk[3] = io_swap(in_key[3])
var lk_4, lk_5 uint32
if key_len > 128 {
lk_4 = in_key[4]
} else {
lk_4 = k2_0
}
if key_len > 128 {
lk_5 = in_key[5]
} else {
lk_5 = k2_1
}
lk[4] = io_swap(lk_4)
lk[5] = io_swap(lk_5)
var lk_6, lk_7 uint32
if key_len > 192 {
lk_6 = in_key[6]
} else {
lk_6 = k3_0
}
if key_len > 192 {
lk_7 = in_key[7]
} else {
lk_7 = k3_1
}
lk[6] = io_swap(lk_6)
lk[7] = io_swap(lk_7)
lout, v = g_fun(lk, lout, v)
l_keyBytes := uint32sToBytes(this.l_key[:])
for i = 0; i < 8; i++ {
lout, v = g_fun(lk, lout, v)
loutBytes := uint32sToBytes(lout[:])
for j = 0; j < 4; j++ {
k = 2 * (48 - 16 * j + 2 * (i / 2) - i % 2)
l_keyBytes[k + 3] = loutBytes[j];
l_keyBytes[k + 2] = loutBytes[j + 16];
l_keyBytes[k + 19] = loutBytes[j + 8];
l_keyBytes[k + 18] = loutBytes[j + 24];
l_keyBytes[k + 131] = loutBytes[j + 4];
l_keyBytes[k + 130] = loutBytes[j + 20];
l_keyBytes[k + 147] = loutBytes[j + 12];
l_keyBytes[k + 146] = loutBytes[j + 28];
}
}
l_key := bytesToUint32s(l_keyBytes)
for i = 52; i < 60; i++ {
l_key[i] |= 1
l_key[i + 12] = mod_inv(l_key[i])
}
for i = 0; i < 48; i += 4 {
bp2_fun(&w, &l_key[i], &l_key[i + 1])
}
copy(this.l_key[0:], l_key)
}
func (this *e2Cipher) encrypt(dst []uint32, src []uint32) {
var a, b, c, d, p, q, r, s, u, v uint32
var out_blk [4]uint32
l_key := this.l_key
p = io_swap(src[0])
q = io_swap(src[1])
r = io_swap(src[2])
s = io_swap(src[3])
p ^= l_key[48]
q ^= l_key[49]
r ^= l_key[50]
s ^= l_key[51]
p *= l_key[52]
q *= l_key[53]
r *= l_key[54]
s *= l_key[55]
bp_fun(&u, &v, &a, &b, &c, &d, p, q, r, s)
f_fun(&p, &q, &r, &s, &u, &v, &a, &b, c, d, l_key[0:])
f_fun(&p, &q, &r, &s, &u, &v, &c, &d, a, b, l_key[4:])
f_fun(&p, &q, &r, &s, &u, &v, &a, &b, c, d, l_key[8:])
f_fun(&p, &q, &r, &s, &u, &v, &c, &d, a, b, l_key[12:])
f_fun(&p, &q, &r, &s, &u, &v, &a, &b, c, d, l_key[16:])
f_fun(&p, &q, &r, &s, &u, &v, &c, &d, a, b, l_key[20:])
f_fun(&p, &q, &r, &s, &u, &v, &a, &b, c, d, l_key[24:])
f_fun(&p, &q, &r, &s, &u, &v, &c, &d, a, b, l_key[28:])
f_fun(&p, &q, &r, &s, &u, &v, &a, &b, c, d, l_key[32:])
f_fun(&p, &q, &r, &s, &u, &v, &c, &d, a, b, l_key[36:])
f_fun(&p, &q, &r, &s, &u, &v, &a, &b, c, d, l_key[40:])
f_fun(&p, &q, &r, &s, &u, &v, &c, &d, a, b, l_key[44:])
ibp_fun(&u, &v, &p, &q, &r, &s, a, b, c, d)
p *= l_key[68]
q *= l_key[69]
r *= l_key[70]
s *= l_key[71]
p ^= l_key[60]
q ^= l_key[61]
r ^= l_key[62]
s ^= l_key[63]
out_blk[0] = io_swap(p)
out_blk[1] = io_swap(q)
out_blk[2] = io_swap(r)
out_blk[3] = io_swap(s)
copy(dst[0:], out_blk[:])
}
func (this *e2Cipher) decrypt(dst []uint32, src []uint32) {
var a, b, c, d, p, q, r, s, u, v uint32
var out_blk [4]uint32
l_key := this.l_key
p = io_swap(src[0])
q = io_swap(src[1])
r = io_swap(src[2])
s = io_swap(src[3])
p ^= l_key[60]
q ^= l_key[61]
r ^= l_key[62]
s ^= l_key[63]
p *= l_key[56]
q *= l_key[57]
r *= l_key[58]
s *= l_key[59]
bp_fun(&u, &v, &a, &b, &c, &d, p, q, r, s)
f_fun(&p, &q, &r, &s, &u, &v, &a, &b, c, d, l_key[44:])
f_fun(&p, &q, &r, &s, &u, &v, &c, &d, a, b, l_key[40:])
f_fun(&p, &q, &r, &s, &u, &v, &a, &b, c, d, l_key[36:])
f_fun(&p, &q, &r, &s, &u, &v, &c, &d, a, b, l_key[32:])
f_fun(&p, &q, &r, &s, &u, &v, &a, &b, c, d, l_key[28:])
f_fun(&p, &q, &r, &s, &u, &v, &c, &d, a, b, l_key[24:])
f_fun(&p, &q, &r, &s, &u, &v, &a, &b, c, d, l_key[20:])
f_fun(&p, &q, &r, &s, &u, &v, &c, &d, a, b, l_key[16:])
f_fun(&p, &q, &r, &s, &u, &v, &a, &b, c, d, l_key[12:])
f_fun(&p, &q, &r, &s, &u, &v, &c, &d, a, b, l_key[8:])
f_fun(&p, &q, &r, &s, &u, &v, &a, &b, c, d, l_key[4:])
f_fun(&p, &q, &r, &s, &u, &v, &c, &d, a, b, l_key[0:])
ibp_fun(&u, &v, &p, &q, &r, &s, a, b, c, d)
p *= l_key[64]
q *= l_key[65]
r *= l_key[66]
s *= l_key[67]
p ^= l_key[48]
q ^= l_key[49]
r ^= l_key[50]
s ^= l_key[51]
out_blk[0] = io_swap(p)
out_blk[1] = io_swap(q)
out_blk[2] = io_swap(r)
out_blk[3] = io_swap(s)
copy(dst[0:], out_blk[:])
}