网站建设计算机人员招聘,网站对比,金坛网站建设,郑州网站建设首选创新简介 本文基于.NET的C#实现3DES算法的加密和解密过程。可以用在加密软件、加密狗等。 代码下载链接#xff1a;https://download.csdn.net/download/C_gyl/88487942
使用 第一种方法 加密
KeySize#xff1a;128(16字节)#xff0c;192#xff08;24字节#x… 简介 本文基于.NET的C#实现3DES算法的加密和解密过程。可以用在加密软件、加密狗等。 代码下载链接https://download.csdn.net/download/C_gyl/88487942
使用 第一种方法 加密
KeySize128(16字节)19224字节。Key TripleDES 算法的密钥。 public static string Encrypt3DES(string str, string key){try{TripleDESCryptoServiceProvider DES new TripleDESCryptoServiceProvider();DES.KeySize 128;DES.Key Encoding.UTF8.GetBytes(key);DES.Mode CipherMode.ECB;DES.Padding PaddingMode.Zeros;ICryptoTransform DESEncrypt DES.CreateEncryptor();byte[] Buffer Encoding.UTF8.GetBytes(str);return ToHexString(DESEncrypt.TransformFinalBlock(Buffer, 0, Buffer.Length), str.Length);}catch (Exception ex) { return ex.Message; }} 解密 public static string Decrypt3DES(string str, string key){try{TripleDESCryptoServiceProvider DES new TripleDESCryptoServiceProvider();DES.Key Encoding.UTF8.GetBytes(key);DES.Mode CipherMode.ECB;DES.Padding PaddingMode.Zeros;ICryptoTransform DESDecrypt DES.CreateDecryptor();byte[] Buffer HexGetBytes(str);byte[] Destxt DESDecrypt.TransformFinalBlock(Buffer, 0, Buffer.Length);return Encoding.UTF8.GetString(Destxt, 0, Destxt.Length);}catch (Exception ex) { return ex.Message; }} 转换 // byte[]转16进制格式string 0xae00cf AE00CF private static string ToHexString(byte[] bytes, int length){string hexString string.Empty;if (bytes ! null){StringBuilder strB new StringBuilder();if (length 0) { length bytes.Length; }for (int i 0; i length; i){strB.Append(bytes[i].ToString(X2));}hexString strB.ToString();} return hexString;}//16进制转byte[] 0x0a 10private static byte[] HexGetBytes(string hexString){int discarded 0;string newString ;char c;// remove all none A-F, 0-9, charactersfor (int i 0; i hexString.Length; i){c hexString[i];if (Uri.IsHexDigit(c))newString c;elsediscarded;}// if odd number of characters, discard last characterif (newString.Length % 2 ! 0){discarded;newString newString.Substring(0, newString.Length - 1);}int byteLength newString.Length / 2;byte[] bytes new byte[byteLength];string hex;int j 0;for (int i 0; i bytes.Length; i){hex new String(new Char[] { newString[j], newString[j 1] });bytes[i] HexToByte(hex);j j 2;}return bytes;}private static byte HexToByte(string hex){byte tt byte.Parse(hex, System.Globalization.NumberStyles.HexNumber);return tt;} 第二种方法
第一种方法有个弊端是.Net会对密钥Key进行判断例如key0000000000000000会有报警指定密钥是“TripleDES”的已知弱密钥不能使用。 .Net方法TripleDES.IsWeakKey它检查3DES密钥的弱点。解释弱密钥参考Decrypting TripleDES指定的密钥是已知的弱密钥不能使用 - VoidCC破解若密钥参考https://www.cnblogs.com/jintianhu/archive/2011/11/26/2264375.html 加密 public static string DESEncrypt(string str, string key){try{TripleDESCryptoServiceProvider des new TripleDESCryptoServiceProvider();des.Padding PaddingMode.Zeros;byte[] keyByte Encoding.UTF8.GetBytes(key);Type t Type.GetType(System.Security.Cryptography.CryptoAPITransformMode);object obj t.GetField(Encrypt, BindingFlags.Instance | BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.DeclaredOnly).GetValue(t);MethodInfo mi des.GetType().GetMethod(_NewEncryptor, BindingFlags.Instance | BindingFlags.NonPublic);ICryptoTransform desCrypt (ICryptoTransform)mi.Invoke(des, new object[] { keyByte, CipherMode.ECB, null, 0, obj });byte[] Buffer Encoding.UTF8.GetBytes(str);byte[] result desCrypt.TransformFinalBlock(Buffer, 0, Buffer.Length);return BitConverter.ToString(result).Replace(-, );}catch (Exception ex) { return ex.Message; }} 解密 public static string DESDecrypt(string str, string key){try{TripleDESCryptoServiceProvider des new TripleDESCryptoServiceProvider();des.Padding PaddingMode.Zeros;byte[] keyByte Encoding.UTF8.GetBytes(key);Type t Type.GetType(System.Security.Cryptography.CryptoAPITransformMode);object obj t.GetField(Decrypt, BindingFlags.Instance | BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.DeclaredOnly).GetValue(t);MethodInfo mi des.GetType().GetMethod(_NewEncryptor, BindingFlags.Instance | BindingFlags.NonPublic);ICryptoTransform desCrypt (ICryptoTransform)mi.Invoke(des, new object[] { keyByte, CipherMode.ECB, null, 0, obj });byte[] Buffer HexGetBytes(str);byte[] Destxt desCrypt.TransformFinalBlock(Buffer, 0, Buffer.Length);return Encoding.UTF8.GetString(Destxt, 0, Destxt.Length);}catch (Exception ex) { return ex.Message; }}
结果 static void Main(string[] args){string str 12345678;//长度是8的倍数string key 1234567812345678; //长度是16或24//第一种方法//有密钥检测//指定密钥是“TripleDES”的已知弱密钥不能使用。string strEncrypt1 Encrypt3DES(str, key);System.Console.WriteLine(加密结果1 strEncrypt1);string strDecrypt1 Decrypt3DES(strEncrypt1, key);System.Console.WriteLine(解密结果1 strDecrypt1);//第二种方法//无弱密钥检测string strEncrypt2 DESEncrypt(str, key);System.Console.WriteLine(加密结果2 strEncrypt2);string strDecrypt2 DESDecrypt(strEncrypt2, key);System.Console.WriteLine(解密结果2 strDecrypt2);Console.ReadKey();} key 1234567890123456 key 1234567812345678
