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clefia.go
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clefia.go
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package clefia
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/clefia: invalid key size %d", int(k))
}
type clefiaCipher struct {
skey []byte
}
// 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(clefiaCipher)
c.expandKey(key)
return c, nil
}
func (this *clefiaCipher) BlockSize() int {
return BlockSize
}
func (this *clefiaCipher) Encrypt(dst, src []byte) {
if len(src) < BlockSize {
panic("cryptobin/clefia: input not full block")
}
if len(dst) < BlockSize {
panic("cryptobin/clefia: output not full block")
}
if alias.InexactOverlap(dst[:BlockSize], src[:BlockSize]) {
panic("cryptobin/clefia: invalid buffer overlap")
}
this.encrypt(dst, src)
}
func (this *clefiaCipher) Decrypt(dst, src []byte) {
if len(src) < BlockSize {
panic("cryptobin/clefia: input not full block")
}
if len(dst) < BlockSize {
panic("cryptobin/clefia: output not full block")
}
if alias.InexactOverlap(dst[:BlockSize], src[:BlockSize]) {
panic("cryptobin/clefia: invalid buffer overlap")
}
this.decrypt(dst, src)
}
func (this *clefiaCipher) encrypt(dst, src []byte) {
var rk [8 * 26 + 16]byte /* 8 bytes x 26 rounds(max) + whitening keys */
var r int32
r = ClefiaKeySet(rk[:], this.skey, int32(len(this.skey)) * 8)
ClefiaEncrypt(dst, src, rk[:], r)
}
func (this *clefiaCipher) decrypt(dst, src []byte) {
var rk [8 * 26 + 16]byte /* 8 bytes x 26 rounds(max) + whitening keys */
var r int32
r = ClefiaKeySet(rk[:], this.skey, int32(len(this.skey)) * 8)
ClefiaDecrypt(dst, src, rk[:], r)
}
func (this *clefiaCipher) expandKey(key []byte) {
this.skey = make([]byte, len(key))
copy(this.skey, key)
}