C# 对应 JAVA 的 AES.encryptBase64() 方法的加密，解密

柔情只为你懂 2023-06-20 12:58 25阅读 0赞

using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Web;
    using System.Text;
    using System.Security.Cryptography;
    using System.IO;
    
    namespace WebSite.ClassLib
    {
        public class AESHelper
        {
                #region Aes加密
                /// <summary>
                /// Aes加密
                /// </summary>
                /// <param name="data">明文</param>
                /// <param name="bkey">密钥</param>
                /// <returns>解密后的字符串</returns>
                public static string AesEncrypt(string data, Byte[] bkey)
                {
                    MemoryStream mStreram = new MemoryStream();
                    RijndaelManaged aes = new RijndaelManaged();
    
                    byte[] plainbyets = Encoding.UTF8.GetBytes(data);
                    //Array.Copy(Encoding.UTF8.GetBytes(key.PadRight(bkey.Length)), bkey, bkey.Length);
    
                    aes.Mode = CipherMode.ECB;
                    aes.Padding = PaddingMode.PKCS7;
                    aes.KeySize = 128;
                    aes.Key = bkey;
                    CryptoStream crypttostream = new CryptoStream(mStreram, aes.CreateEncryptor(), CryptoStreamMode.Write);
                    try
                    {
                        crypttostream.Write(plainbyets, 0, plainbyets.Length);
                        crypttostream.FlushFinalBlock();
                        return Convert.ToBase64String(mStreram.ToArray());
                    }
                    finally
                    {
                        crypttostream.Close();
                        mStreram.Close();
                        aes.Clear();
                    }
                }
                #endregion
    
                #region  AES解密
                /// <summary>
                /// AES解密
                /// </summary>
                /// <param name="data">被加密的明文</param>
                /// <param name="bkey">密钥</param>
                /// <returns>明文</returns>
                public static string AESDecrypt(String data, Byte[] bkey)
                {
                    Byte[] encryptedBytes = Convert.FromBase64String(data);
                    // Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bkey.Length)), bkey, bkey.Length);
    
                    MemoryStream mStream = new MemoryStream(encryptedBytes);
                    RijndaelManaged aes = new RijndaelManaged();
                    aes.Mode = CipherMode.ECB;
                    aes.Padding = PaddingMode.PKCS7;
                    aes.KeySize = 128;
                    aes.Key = bkey;
    
                    CryptoStream cryptoStream = new CryptoStream(mStream, aes.CreateDecryptor(), CryptoStreamMode.Read);
                    try
                    {
                        byte[] tmp = new byte[encryptedBytes.Length + 32];
                        int len = cryptoStream.Read(tmp, 0, encryptedBytes.Length + 32);
                        byte[] ret = new byte[len];
                        Array.Copy(tmp, 0, ret, 0, len);
                        return Encoding.UTF8.GetString(ret);
                    }
                    finally
                    {
                        cryptoStream.Close();
                        mStream.Close();
                        aes.Clear();
                    }
                }
                #endregion
            }
    }