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des ecb mode in golang
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package main | |
import ( | |
"bytes" | |
"crypto/cipher" | |
"crypto/des" | |
"encoding/base64" | |
"fmt" | |
) | |
func main() { | |
// DES 加解密 | |
testDes() | |
// 3DES加解密 | |
test3Des() | |
} | |
func testDes() { | |
key := []byte("256&#@$M") | |
result, err := DesEncrypt([]byte("123456"), key) | |
if err != nil { | |
panic(err) | |
} | |
fmt.Println(base64.StdEncoding.EncodeToString(result)) | |
hexstr := fmt.Sprintf("%X", result) | |
fmt.Println(hexstr) | |
origData, err := DesDecrypt(result, key) | |
if err != nil { | |
panic(err) | |
} | |
fmt.Println("=======") | |
fmt.Println(string(origData)) | |
} | |
func test3Des() { | |
key := []byte("256&#@$Msefiel#fi32lf3e!") | |
result, err := TripleDesEncrypt([]byte("123456"), key) | |
if err != nil { | |
panic(err) | |
} | |
fmt.Println(base64.StdEncoding.EncodeToString(result)) | |
origData, err := TripleDesDecrypt(result, key) | |
if err != nil { | |
panic(err) | |
} | |
fmt.Println(string(origData)) | |
} | |
func DesEncrypt(origData, key []byte) ([]byte, error) { | |
block, err := des.NewCipher(key) | |
if err != nil { | |
return nil, err | |
} | |
origData = PKCS5Padding(origData, block.BlockSize()) | |
// origData = ZeroPadding(origData, block.BlockSize()) | |
blockMode := cipher.NewCBCEncrypter(block, key) | |
crypted := make([]byte, len(origData)) | |
// 根据CryptBlocks方法的说明,如下方式初始化crypted也可以 | |
// crypted := origData | |
blockMode.CryptBlocks(crypted, origData) | |
return crypted, nil | |
} | |
func DesDecrypt(crypted, key []byte) ([]byte, error) { | |
block, err := des.NewCipher(key) | |
if err != nil { | |
return nil, err | |
} | |
blockMode := cipher.NewCBCDecrypter(block, key) | |
origData := make([]byte, len(crypted)) | |
// origData := crypted | |
blockMode.CryptBlocks(origData, crypted) | |
origData = PKCS5UnPadding(origData) | |
// origData = ZeroUnPadding(origData) | |
return origData, nil | |
} | |
// 3DES加密 | |
func TripleDesEncrypt(origData, key []byte) ([]byte, error) { | |
block, err := des.NewTripleDESCipher(key) | |
if err != nil { | |
return nil, err | |
} | |
origData = PKCS5Padding(origData, block.BlockSize()) | |
// origData = ZeroPadding(origData, block.BlockSize()) | |
blockMode := cipher.NewCBCEncrypter(block, key[:8]) | |
crypted := make([]byte, len(origData)) | |
blockMode.CryptBlocks(crypted, origData) | |
return crypted, nil | |
} | |
// 3DES解密 | |
func TripleDesDecrypt(crypted, key []byte) ([]byte, error) { | |
block, err := des.NewTripleDESCipher(key) | |
if err != nil { | |
return nil, err | |
} | |
blockMode := cipher.NewCBCDecrypter(block, key[:8]) | |
origData := make([]byte, len(crypted)) | |
// origData := crypted | |
blockMode.CryptBlocks(origData, crypted) | |
origData = PKCS5UnPadding(origData) | |
// origData = ZeroUnPadding(origData) | |
return origData, nil | |
} | |
func ZeroPadding(ciphertext []byte, blockSize int) []byte { | |
padding := blockSize - len(ciphertext)%blockSize | |
padtext := bytes.Repeat([]byte{0}, padding) | |
return append(ciphertext, padtext...) | |
} | |
func ZeroUnPadding(origData []byte) []byte { | |
return bytes.TrimRightFunc(origData, func(r rune) bool { | |
return r == rune(0) | |
}) | |
} | |
func PKCS5Padding(ciphertext []byte, blockSize int) []byte { | |
padding := blockSize - len(ciphertext)%blockSize | |
padtext := bytes.Repeat([]byte{byte(padding)}, padding) | |
return append(ciphertext, padtext...) | |
} | |
func PKCS5UnPadding(origData []byte) []byte { | |
length := len(origData) | |
// 去掉最后一个字节 unpadding 次 | |
unpadding := int(origData[length-1]) | |
return origData[:(length - unpadding)] | |
} |
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package main | |
import ( | |
"fmt" | |
"testing" | |
) | |
func TestDesEncrypt(t *testing.T) { | |
key := []byte("5e8487e6") | |
origtext := []byte("hello world123563332") | |
erytext, err := DesEncrypt(origtext, key) | |
if err != nil { | |
t.Fatal(err) | |
} | |
fmt.Printf("%v\n", erytext) | |
destext, err2 := DesDecrypt(erytext, key) | |
if err2 != nil { | |
t.Fatal(err2) | |
} | |
fmt.Println(string(destext)) | |
fmt.Println(len(origtext), len(string(destext))) | |
fmt.Println(string(origtext) == string(destext)) | |
} |
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go test . -v |
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