371 lines
9.1 KiB
Go
371 lines
9.1 KiB
Go
package aesx
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import (
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"bytes"
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"crypto/aes"
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"crypto/cipher"
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"crypto/rand"
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"encoding/hex"
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"errors"
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"fmt"
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"io"
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"strings"
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)
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// AES-256-ECB 加密,返回大写的十六进制字符串
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func EncryptECBHex(input, key string) (string, error) {
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// 创建AES加密器
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block, err := aes.NewCipher([]byte(key))
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if err != nil {
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return "", err
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}
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// 对输入数据进行PKCS7填充
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paddedInput := PKCS7Padding([]byte(input), block.BlockSize())
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// ECB模式加密
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encrypted := make([]byte, len(paddedInput))
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for i := 0; i < len(paddedInput); i += aes.BlockSize {
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block.Encrypt(encrypted[i:i+aes.BlockSize], paddedInput[i:i+aes.BlockSize])
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}
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// 转换为十六进制并大写
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result := hex.EncodeToString(encrypted)
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return strings.ToUpper(result), nil
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}
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// AES-256-ECB 解密,输入大写的十六进制字符串
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func DecryptECBHex(encryptedHex, key string) (string, error) {
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encrypted, err := hex.DecodeString(encryptedHex)
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if err != nil {
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return "", fmt.Errorf("hex解码失败: %v", err)
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}
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block, err := aes.NewCipher([]byte(key))
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if err != nil {
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return "", fmt.Errorf("创建AES解密器失败: %v", err)
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}
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// ECB模式解密
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decrypted := make([]byte, len(encrypted))
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for i := 0; i < len(encrypted); i += aes.BlockSize {
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block.Decrypt(decrypted[i:i+aes.BlockSize], encrypted[i:i+aes.BlockSize])
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}
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// 去除PKCS7填充
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unpaddedData, err := PKCS7UnPadding(decrypted)
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if err != nil {
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return "", fmt.Errorf("去除填充失败: %v", err)
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}
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return string(unpaddedData), nil
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}
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// AES-256-CBC 加密
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func EncryptCBCHex(plaintext, key string) (string, error) {
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block, err := aes.NewCipher([]byte(key))
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if err != nil {
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return "", err
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}
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blockSize := block.BlockSize()
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plainBytes := PKCS7Padding([]byte(plaintext), blockSize)
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// 创建密文字节切片，包含IV空间
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cipherbyte := make([]byte, aes.BlockSize+len(plainBytes))
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// 生成随机IV
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iv := cipherbyte[:aes.BlockSize]
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if _, err := io.ReadFull(rand.Reader, iv); err != nil {
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return "", err
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}
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// 创建CBC模式加密器
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blockMode := cipher.NewCBCEncrypter(block, iv)
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// 加密数据
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blockMode.CryptBlocks(cipherbyte[aes.BlockSize:], plainBytes)
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// 转换为十六进制并大写
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result := hex.EncodeToString(cipherbyte)
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return strings.ToUpper(result), nil
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}
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// AES-256-CBC 解密
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func DecryptCBCHex(encryptedHex, key string) (string, error) {
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cipherbyte, err := hex.DecodeString(encryptedHex)
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if err != nil {
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return "", fmt.Errorf("hex解码失败: %v", err)
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}
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if len(cipherbyte) < aes.BlockSize {
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return "", errors.New("ciphertext too short")
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}
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block, err := aes.NewCipher([]byte(key))
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if err != nil {
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return "", err
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}
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iv := cipherbyte[:aes.BlockSize]
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cipherbyte = cipherbyte[aes.BlockSize:]
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if len(cipherbyte)%aes.BlockSize != 0 {
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return "", errors.New("ciphertext is not a multiple of the block size")
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}
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blockMode := cipher.NewCBCDecrypter(block, iv)
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origData := make([]byte, len(cipherbyte))
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blockMode.CryptBlocks(origData, cipherbyte)
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origBy, err := PKCS7UnPadding(origData)
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if err != nil {
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return "", err
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}
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return string(origBy), nil
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}
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/*
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AES CBC 加密
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key:加密key
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plaintext：加密明文
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ciphertext:解密返回字节字符串[ 整型以十六进制方式显示]
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*/
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func AESCBCEncrypt(key, plaintext string) (ciphertext string, err error) {
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block, err := aes.NewCipher([]byte(key))
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if err != nil {
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return "", err
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}
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padding := aes.BlockSize - (len(plaintext) % aes.BlockSize)
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padtest := bytes.Repeat([]byte{byte(padding)}, padding)
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plainBytes := append([]byte(plaintext), padtest...)
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cipherbyte := make([]byte, aes.BlockSize+len(plainBytes))
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iv := cipherbyte[:aes.BlockSize]
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if _, err := io.ReadFull(rand.Reader, iv); err != nil {
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return "", err
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}
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mode := cipher.NewCBCEncrypter(block, iv)
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mode.CryptBlocks(cipherbyte[aes.BlockSize:], plainBytes)
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ciphertext = fmt.Sprintf("%x\n", cipherbyte)
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return
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}
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// AES CBC 解码
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// key:解密key
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// ciphertext:加密返回的串
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// plaintext：解密后的字符串
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func AESCBCDecrypter(key, ciphertext string) (plaintext string, err error) {
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cipherbyte, _ := hex.DecodeString(ciphertext)
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keybyte := []byte(key)
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block, err := aes.NewCipher(keybyte)
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if err != nil {
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return "", err
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}
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if len(cipherbyte) < aes.BlockSize {
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return "", errors.New("ciphertext too short")
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}
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iv := cipherbyte[:aes.BlockSize]
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cipherbyte = cipherbyte[aes.BlockSize:]
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if len(cipherbyte)%aes.BlockSize != 0 {
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return "", errors.New("ciphertext is not a multiple of the block size")
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}
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mode := cipher.NewCBCDecrypter(block, iv)
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mode.CryptBlocks(cipherbyte, cipherbyte)
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//fmt.Printf("%s\n", ciphertext)
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plaintext = string(cipherbyte[:])
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return
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}
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// AES GCM 加密
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// key:加密key
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// plaintext：加密明文
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// ciphertext:解密返回字节字符串[ 整型以十六进制方式显示]
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func EncryptGCM(key, plaintext string) (ciphertext, noncetext string, err error) {
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plainbyte := []byte(plaintext)
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keybyte := []byte(key)
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block, err := aes.NewCipher(keybyte)
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if err != nil {
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return "", "", err
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}
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// 由于存在重复的风险，请勿使用给定密钥使用超过2^32个随机值。
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nonce := make([]byte, 12)
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if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
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return "", "", err
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}
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aesgcm, err := cipher.NewGCM(block)
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if err != nil {
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return "", "", err
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}
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cipherbyte := aesgcm.Seal(nil, nonce, plainbyte, nil)
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ciphertext = fmt.Sprintf("%x\n", cipherbyte)
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noncetext = fmt.Sprintf("%x\n", nonce)
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return
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}
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// AES GCM 解码
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// key:解密key
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// ciphertext:加密返回的串
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// plaintext：解密后的字符串
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func DecryptGCM(key, ciphertext, noncetext string) (plaintext string, err error) {
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cipherbyte, _ := hex.DecodeString(ciphertext)
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nonce, _ := hex.DecodeString(noncetext)
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keybyte := []byte(key)
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block, err := aes.NewCipher(keybyte)
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if err != nil {
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return "", err
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}
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aesgcm, err := cipher.NewGCM(block)
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if err != nil {
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return "", err
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}
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plainbyte, err := aesgcm.Open(nil, nonce, cipherbyte, nil)
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if err != nil {
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return "", err
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}
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//fmt.Printf("%s\n", ciphertext)
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plaintext = string(plainbyte[:])
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return
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}
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// AES CFB 加密
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func EncryptCFBHex(plaintext, key string) (string, error) {
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block, err := aes.NewCipher([]byte(key))
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if err != nil {
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return "", err
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}
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// 创建密文字节切片，包含IV空间
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cipherbyte := make([]byte, aes.BlockSize+len(plaintext))
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// 生成随机IV
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iv := cipherbyte[:aes.BlockSize]
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if _, err := io.ReadFull(rand.Reader, iv); err != nil {
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return "", err
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}
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// 创建CFB模式加密器
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stream := cipher.NewCFBEncrypter(block, iv)
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stream.XORKeyStream(cipherbyte[aes.BlockSize:], []byte(plaintext))
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// 转换为十六进制并大写
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result := hex.EncodeToString(cipherbyte)
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return strings.ToUpper(result), nil
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}
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// AES CFB 解密
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func DecryptCFBHex(encryptedHex, key string) (string, error) {
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cipherbyte, err := hex.DecodeString(encryptedHex)
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if err != nil {
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return "", fmt.Errorf("hex解码失败: %v", err)
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}
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if len(cipherbyte) < aes.BlockSize {
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return "", errors.New("ciphertext too short")
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}
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block, err := aes.NewCipher([]byte(key))
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if err != nil {
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return "", err
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}
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// 获取IV
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iv := cipherbyte[:aes.BlockSize]
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cipherbyte = cipherbyte[aes.BlockSize:]
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// 创建CFB模式解密器
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stream := cipher.NewCFBDecrypter(block, iv)
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stream.XORKeyStream(cipherbyte, cipherbyte)
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return string(cipherbyte), nil
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}
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// AES OFB 加密
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func EncryptOFBHex(plaintext, key string) (string, error) {
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block, err := aes.NewCipher([]byte(key))
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if err != nil {
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return "", err
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}
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// 创建密文字节切片，包含IV空间
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cipherbyte := make([]byte, aes.BlockSize+len(plaintext))
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// 生成随机IV
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iv := cipherbyte[:aes.BlockSize]
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if _, err := io.ReadFull(rand.Reader, iv); err != nil {
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return "", err
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}
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// 创建OFB模式加密器
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stream := cipher.NewOFB(block, iv)
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stream.XORKeyStream(cipherbyte[aes.BlockSize:], []byte(plaintext))
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// 转换为十六进制并大写
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result := hex.EncodeToString(cipherbyte)
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return strings.ToUpper(result), nil
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}
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// AES OFB 解密
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func DecryptOFBHex(encryptedHex, key string) (string, error) {
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cipherbyte, err := hex.DecodeString(encryptedHex)
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if err != nil {
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return "", fmt.Errorf("hex解码失败: %v", err)
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}
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if len(cipherbyte) < aes.BlockSize {
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return "", errors.New("ciphertext too short")
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}
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block, err := aes.NewCipher([]byte(key))
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if err != nil {
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return "", err
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}
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// 获取IV
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iv := cipherbyte[:aes.BlockSize]
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cipherbyte = cipherbyte[aes.BlockSize:]
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// 创建OFB模式解密器
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stream := cipher.NewOFB(block, iv)
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stream.XORKeyStream(cipherbyte, cipherbyte)
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return string(cipherbyte), nil
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}
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// PKCS7补码
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func PKCS7Padding(ciphertext []byte, blockSize int) []byte {
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padding := blockSize - len(ciphertext)%blockSize
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padtext := bytes.Repeat([]byte{byte(padding)}, padding)
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return append(ciphertext, padtext...)
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}
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// 去除PKCS7补码
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func PKCS7UnPadding(data []byte) ([]byte, error) {
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length := len(data)
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if length == 0 {
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return nil, errors.New("ciphertext is empty")
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}
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unpadding := int(data[length-1])
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if unpadding > length || unpadding == 0 {
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return nil, errors.New("unpadding size is invalid")
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}
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// 检查填充是否正确
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for i := length - unpadding; i < length; i++ {
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if data[i] != byte(unpadding) {
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return nil, errors.New("invalid padding")
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}
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}
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return data[:(length - unpadding)], nil
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} |