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des.go
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des.go
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package codec
import (
"crypto/cipher"
"crypto/des"
"fmt"
"github.com/pkg/errors"
)
func desEnc(key []byte, data []byte, iv []byte, mode func(cipher.Block, []byte) cipher.BlockMode, isTripleDES bool) ([]byte, error) {
var block cipher.Block
var err error
if iv == nil {
iv = make([]byte, 8)
} else {
if len(iv)%8 != 0 {
iv = ZeroPadding(iv, 8)
}
}
if len(key)%8 != 0 {
key = ZeroPadding(key, 8)
if len(key) > 8 {
key = key[:8]
}
}
if isTripleDES {
block, err = des.NewTripleDESCipher(key)
} else {
block, err = des.NewCipher(key)
}
if err != nil {
return nil, errors.Errorf("create cipher failed: %s", err)
}
if len(data)%8 != 0 {
data = ZeroPadding(data, 8)
}
cbcMode := mode(block, iv)
result := make([]byte, len(data))
cbcMode.CryptBlocks(result, data)
return result, nil
}
func desDec(key []byte, data []byte, iv []byte, mode func(cipher.Block, []byte) cipher.BlockMode, isTripleDES bool) ([]byte, error) {
var block cipher.Block
var err error
if iv == nil {
iv = make([]byte, 8)
} else {
if len(iv)%8 != 0 {
iv = ZeroPadding(iv, 8)
}
}
if len(key)%8 != 0 {
key = ZeroPadding(key, 8)
if len(key) > 8 {
key = key[:8]
}
}
if isTripleDES {
block, err = des.NewTripleDESCipher(key)
} else {
block, err = des.NewCipher(key)
}
if err != nil {
return nil, errors.Errorf("create cipher failed: %s", err)
}
if len(data)%8 != 0 {
data = ZeroPadding(data, 8)
}
cbcMode := mode(block, iv)
result := make([]byte, len(data))
cbcMode.CryptBlocks(result, data)
return result, nil
}
func DESCBCEncEx(key []byte, data []byte, iv []byte, isTripleDES bool) ([]byte, error) {
return desEnc(key, data, iv, cipher.NewCBCEncrypter, isTripleDES)
}
func DESCBCDecEx(key, data, iv []byte, isTripleDES bool) ([]byte, error) {
return desDec(key, data, iv, cipher.NewCBCDecrypter, isTripleDES)
}
func DESECBEncEx(key []byte, data []byte, isTripleDES bool) ([]byte, error) {
var block cipher.Block
var err error
blockSize := 8
if len(key)%blockSize != 0 {
key = ZeroPadding(key, blockSize)
if len(key) > 8 {
key = key[:8]
}
}
if isTripleDES {
block, err = des.NewTripleDESCipher(key)
} else {
block, err = des.NewCipher(key)
}
if err != nil {
return nil, fmt.Errorf("DES ECB Error: %s", err)
}
if len(data)%blockSize != 0 {
data = ZeroPadding(data, blockSize)
}
encrypted := make([]byte, len(data))
for bs, be := 0, blockSize; bs < len(data); bs, be = bs+blockSize, be+blockSize {
block.Encrypt(encrypted[bs:be], data[bs:be])
}
return encrypted, nil
}
func DESECBDecEx(key []byte, data []byte, isTripleDES bool) ([]byte, error) {
var block cipher.Block
var err error
blockSize := 8
if len(key)%blockSize != 0 {
key = ZeroPadding(key, blockSize)
if len(key) > 8 {
key = key[:8]
}
}
if isTripleDES {
block, err = des.NewTripleDESCipher(key)
} else {
block, err = des.NewCipher(key)
}
if err != nil {
return nil, fmt.Errorf("DES ECB Error: %s", err)
}
if len(data)%blockSize != 0 {
data = ZeroPadding(data, blockSize)
}
decrypted := make([]byte, len(data))
for bs, be := 0, blockSize; bs < len(data); bs, be = bs+blockSize, be+blockSize {
block.Decrypt(decrypted[bs:be], data[bs:be])
}
return decrypted, nil
}
func DESCBCEnc(key []byte, data []byte, iv []byte) ([]byte, error) {
return DESCBCEncEx(key, data, iv, false)
}
func TripleDES_CBCEnc(key []byte, data []byte, iv []byte) ([]byte, error) {
return DESCBCEncEx(key, data, iv, true)
}
func DESCBCDec(key []byte, data []byte, iv []byte) ([]byte, error) {
return DESCBCDecEx(key, data, iv, false)
}
func TripleDES_CBCDec(key []byte, data []byte, iv []byte) ([]byte, error) {
return DESCBCDecEx(key, data, iv, true)
}
func DESECBEnc(key []byte, data []byte) ([]byte, error) {
return DESECBEncEx(key, data, false)
}
func TripleDES_ECBEnc(key []byte, data []byte) ([]byte, error) {
return DESECBEncEx(key, data, true)
}
func DESECBDec(key []byte, data []byte) ([]byte, error) {
return DESECBDecEx(key, data, false)
}
func TripleDES_ECBDec(key []byte, data []byte) ([]byte, error) {
return DESECBDecEx(key, data, true)
}