/
ctr.go
63 lines (48 loc) · 1.63 KB
/
ctr.go
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// Copyright 2023 FishGoddess. All rights reserved.
// Use of this source code is governed by a MIT style
// license that can be found in the LICENSE file.
package des
import (
"crypto/cipher"
"github.com/FishGoddess/cryptox"
)
func encryptCTR(block cipher.Block, padding cryptox.Padding, iv cryptox.Bytes, bs cryptox.Bytes) (cryptox.Bytes, error) {
src := padding(bs.Clone(), block.BlockSize())
dst := src.Clone()
cipher.NewCTR(block, iv).XORKeyStream(dst, src)
return dst, nil
}
func decryptCTR(block cipher.Block, unpadding cryptox.UnPadding, iv cryptox.Bytes, bs cryptox.Bytes) (cryptox.Bytes, error) {
src := bs
dst := bs.Clone()
cipher.NewCTR(block, iv).XORKeyStream(dst, src)
return unpadding(dst, block.BlockSize())
}
func (d DES) EncryptCTR(padding cryptox.Padding, iv cryptox.Bytes, bs cryptox.Bytes) (cryptox.Bytes, error) {
block, err := d.block, d.err
if err != nil {
return nil, err
}
return encryptCTR(block, padding, iv, bs)
}
func (d DES) DecryptCTR(unpadding cryptox.UnPadding, iv cryptox.Bytes, bs cryptox.Bytes) (cryptox.Bytes, error) {
block, err := d.block, d.err
if err != nil {
return nil, err
}
return decryptCTR(block, unpadding, iv, bs)
}
func (td TripleDES) EncryptCTR(padding cryptox.Padding, iv cryptox.Bytes, bs cryptox.Bytes) (cryptox.Bytes, error) {
block, err := td.block, td.err
if err != nil {
return nil, err
}
return encryptCTR(block, padding, iv, bs)
}
func (td TripleDES) DecryptCTR(unpadding cryptox.UnPadding, iv cryptox.Bytes, bs cryptox.Bytes) (cryptox.Bytes, error) {
block, err := td.block, td.err
if err != nil {
return nil, err
}
return decryptCTR(block, unpadding, iv, bs)
}