分組密碼的調用

CBC

package mainimport ("bytes""crypto/cipher""crypto/aes""encoding/base64""fmt" )func PKCS7Padding(ciphertext []byte, blockSize int) []byte {padding := blockSize - len(ciphertext) % blockSizepadtext := bytes.Repeat([]byte{byte(padding)}, padding)return append(ciphertext, padtext...) }func PKCS7UnPadding(origData []byte) []byte {length := len(origData)unpadding := int(origData[length-1])return origData[:(length - unpadding)] }func AesEncrypt(origData, key []byte) ([]byte, error) {block, err := aes.NewCipher(key)if err != nil {return nil, err}blockSize := block.BlockSize()origData = PKCS7Padding(origData, blockSize)blockMode := cipher.NewCBCEncrypter(block, key[:blockSize])crypted := make([]byte, len(origData))blockMode.CryptBlocks(crypted, origData)return crypted, nil }func AesDecrypt(crypted, key []byte) ([]byte, error) {block, err := aes.NewCipher(key)if err != nil {return nil, err}blockSize := block.BlockSize()blockMode := cipher.NewCBCDecrypter(block, key[:blockSize])origData := make([]byte, len(crypted))blockMode.CryptBlocks(origData, crypted)origData = PKCS7UnPadding(origData)return origData, nil }func main() {key := []byte("0123456789abcdef")result, err := AesEncrypt([]byte("hello world"), key)if err != nil {panic(err)}fmt.Println(base64.StdEncoding.EncodeToString(result))origData, err := AesDecrypt(result, key)if err != nil {panic(err)}fmt.Println(string(origData)) }

CFB 模式

package mainimport ("io""crypto/cipher""crypto/aes""crypto/rand""encoding/base64""fmt" )func AesEncrypt(plaintext, key []byte) ([]byte, error) {block, err := aes.NewCipher(key)if err != nil {return nil, err}ciphertext := make([]byte, aes.BlockSize+len(plaintext))iv := ciphertext[:aes.BlockSize]if _, err := io.ReadFull(rand.Reader, iv); err != nil {panic(err)}stream := cipher.NewCFBEncrypter(block, iv)stream.XORKeyStream(ciphertext[aes.BlockSize:], plaintext)return ciphertext, nil }func AesDecrypt(ciphertext, key []byte) ([]byte, error) {block, err := aes.NewCipher(key)if err != nil {return nil, err}// The IV needs to be unique, but not secure. Therefore it's common to// include it at the beginning of the ciphertext.if len(ciphertext) < aes.BlockSize {panic("ciphertext too short")}iv := ciphertext[:aes.BlockSize]ciphertext = ciphertext[aes.BlockSize:]stream := cipher.NewCFBDecrypter(block, iv)// XORKeyStream can work in-place if the two arguments are the same.stream.XORKeyStream(ciphertext, ciphertext)return ciphertext, nil }func main() {key := []byte("0123456789abcdef")result, err := AesEncrypt([]byte("hello world"), key)if err != nil {panic(err)}fmt.Println(base64.StdEncoding.EncodeToString(result))origData, err := AesDecrypt(result, key)if err != nil {panic(err)}fmt.Println(string(origData)) }

OFB 模式

package mainimport ("io""crypto/cipher""crypto/aes""crypto/rand""encoding/base64""fmt" )func AesEncrypt(plaintext, key []byte) ([]byte, error) {block, err := aes.NewCipher(key)if err != nil {return nil, err}ciphertext := make([]byte, aes.BlockSize+len(plaintext))iv := ciphertext[:aes.BlockSize]if _, err := io.ReadFull(rand.Reader, iv); err != nil {panic(err)}stream := cipher.NewOFB(block, iv)stream.XORKeyStream(ciphertext[aes.BlockSize:], plaintext)return ciphertext, nil }func AesDecrypt(ciphertext, key []byte) ([]byte, error) {block, err := aes.NewCipher(key)if err != nil {return nil, err}// The IV needs to be unique, but not secure. Therefore it's common to// include it at the beginning of the ciphertext.iv := ciphertext[:aes.BlockSize]if len(ciphertext) < aes.BlockSize {panic("ciphertext too short")}plaintext2 := make([]byte, len(ciphertext))stream := cipher.NewOFB(block, iv)stream.XORKeyStream(plaintext2, ciphertext[aes.BlockSize:])return plaintext2, nil }func main() {key := []byte("6368616e676520746869732070617374")result, err := AesEncrypt([]byte("hello world"), key)if err != nil {panic(err)}fmt.Println(base64.StdEncoding.EncodeToString(result))origData, err := AesDecrypt(result, key)if err != nil {panic(err)}fmt.Println(string(origData)) }

CTR模式

package mainimport ("io""crypto/cipher""crypto/aes""crypto/rand""encoding/base64""fmt" )func AesEncrypt(plaintext, key []byte) ([]byte, error) {block, err := aes.NewCipher(key)if err != nil {return nil, err}ciphertext := make([]byte, aes.BlockSize+len(plaintext))iv := ciphertext[:aes.BlockSize]if _, err := io.ReadFull(rand.Reader, iv); err != nil {panic(err)}stream := cipher.NewCTR(block, iv)stream.XORKeyStream(ciphertext[aes.BlockSize:], plaintext)return ciphertext, nil }func AesDecrypt(ciphertext, key []byte) ([]byte, error) {block, err := aes.NewCipher(key)if err != nil {return nil, err}// The IV needs to be unique, but not secure. Therefore it's common to// include it at the beginning of the ciphertext.iv := ciphertext[:aes.BlockSize]if len(ciphertext) < aes.BlockSize {panic("ciphertext too short")}plaintext2 := make([]byte, len(ciphertext))stream := cipher.NewCTR(block, iv)stream.XORKeyStream(plaintext2, ciphertext[aes.BlockSize:])return plaintext2, nil }func main() {key := []byte("6368616e676520746869732070617374")result, err := AesEncrypt([]byte("hello world"), key)if err != nil {panic(err)}fmt.Println(base64.StdEncoding.EncodeToString(result))origData, err := AesDecrypt(result, key)if err != nil {panic(err)}fmt.Println(string(origData)) }

總結

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