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loki97.go
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loki97.go
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package loki97
import (
"sync"
"strconv"
"crypto/cipher"
"github.com/deatil/go-cryptobin/tool/alias"
)
const (
BlockSize = 16
)
var (
once sync.Once
S1 [S1_SIZE]byte
S2 [S2_SIZE]byte
P [PERMUTATION_SIZE]ULONG64
)
func initAll() {
S1 = generationS1Box()
S2 = generationS2Box()
P = permutationGeneration()
}
type KeySizeError int
func (k KeySizeError) Error() string {
return "cryptobin/loki97: invalid key size " + strconv.Itoa(int(k))
}
type loki97Cipher struct {
key []ULONG64
}
// NewCipher creates and returns a new cipher.Block.
// data bytes use BigEndian, if is LittleEndian
// please change BigEndian bytes
func NewCipher(key []byte) (cipher.Block, error) {
k := len(key)
switch k {
case 16, 24, 32:
break
default:
return nil, KeySizeError(len(key))
}
once.Do(initAll)
newKey := makeKey(key)
c := new(loki97Cipher)
c.key = newKey[:]
return c, nil
}
func (this *loki97Cipher) BlockSize() int {
return BlockSize
}
func (this *loki97Cipher) Encrypt(dst, src []byte) {
if len(src) < BlockSize {
panic("cryptobin/loki97: input not full block")
}
if len(dst) < BlockSize {
panic("cryptobin/loki97: output not full block")
}
if alias.InexactOverlap(dst[:BlockSize], src[:BlockSize]) {
panic("cryptobin/loki97: invalid buffer overlap")
}
encBlock := blockEncrypt(src, this.key)
copy(dst, encBlock)
}
func (this *loki97Cipher) Decrypt(dst, src []byte) {
if len(src) < BlockSize {
panic("cryptobin/loki97: input not full block")
}
if len(dst) < BlockSize {
panic("cryptobin/loki97: output not full block")
}
if alias.InexactOverlap(dst[:BlockSize], src[:BlockSize]) {
panic("cryptobin/loki97: invalid buffer overlap")
}
decBlock := blockDecrypt(src, this.key);
copy(dst, decBlock)
}