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des ecb mode in golang
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| package main | |
| import ( | |
| "bytes" | |
| "crypto/des" | |
| "errors" | |
| ) | |
| 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) | |
| unpadding := int(origData[length-1]) | |
| return origData[:(length - unpadding)] | |
| } | |
| 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.TrimFunc(origData, | |
| func(r rune) bool { | |
| return r == rune(0) | |
| }) | |
| } | |
| func DesEncrypt(src, key []byte) ([]byte, error) { | |
| block, err := des.NewCipher(key) | |
| if err != nil { | |
| return nil, err | |
| } | |
| bs := block.BlockSize() | |
| src = ZeroPadding(src, bs) | |
| // src = PKCS5Padding(src, bs) | |
| if len(src)%bs != 0 { | |
| return nil, errors.New("Need a multiple of the blocksize") | |
| } | |
| out := make([]byte, len(src)) | |
| dst := out | |
| for len(src) > 0 { | |
| block.Encrypt(dst, src[:bs]) | |
| src = src[bs:] | |
| dst = dst[bs:] | |
| } | |
| return out, nil | |
| } | |
| func DesDecrypt(src, key []byte) ([]byte, error) { | |
| block, err := des.NewCipher(key) | |
| if err != nil { | |
| return nil, err | |
| } | |
| out := make([]byte, len(src)) | |
| dst := out | |
| bs := block.BlockSize() | |
| if len(src)%bs != 0 { | |
| return nil, errors.New("crypto/cipher: input not full blocks") | |
| } | |
| for len(src) > 0 { | |
| block.Decrypt(dst, src[:bs]) | |
| src = src[bs:] | |
| dst = dst[bs:] | |
| } | |
| out = ZeroUnPadding(out) | |
| // out = PKCS5UnPadding(out) | |
| return out, nil | |
| } |
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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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您好，我最近在做des加解密，搜到您的代码。
想问两个问题：
1.用0补位那个方法有什么好处吗？
2.我要加密一个整形，用这种方法有没有什么问题？
能否帮忙解答一下