标签：des style blog http io ar color os 使用
转至 ：AES加密CBC模式兼容互通四种编程语言平台【PHP、Javascript、Java、C#】
http://my.oschina.net/Jacker/blog/86383
下文转至 ：http://www.cnblogs.com/wuhuacong/archive/2010/09/30/1839119.html
也有一些是我自己现在用的，需要的朋友可以看看，个人感觉比较全的加密。
数据的加密重要性大家皆知，很多情况下需要对数据进行加密处理，但各种重要数据的加密要求不一样，有些需要时可逆的，有些是不要求可逆的，可逆的一般称之为对称加密算法，不可逆的一般可以成为非对称加密算法。如登录密码，一般较好的方式是采用不可逆的加密算法，如MD5、SHA256、哈希数值等，当然也有的采用可逆的强度好一些的加密方式，在选择加密键值的时候，变化一下也算是比较不错的选择。另外一些为了掩人耳目或者不让别人直接可以查看到，就采用其他的加密算法，如DES加密算法、AES的RijndaelManaged加密算法，或者也可以采用Base64加密，甚至我看到一个很变态的方式，就是用MD5加密的头，内容则采用Base64的方式加密，一般不知道内情的还真的不好处理。
在吉日《[走火入魔失眠夜]浅谈管理软件信息安全，用户名、密码的加密解密【附C#配套加密解密源码】》 的文章中也对加密做了一些介绍和分析，并贴出了MD5、DES的加密方式代码，吉日的文章图文并茂、哲理及诙谐例子并存，本文有感而发，做一些补充，希望园子同行共通过切磋，交流心得。
加密字符串的方式有很多，也都可以通过这样的加密文件内容，不过较好的方式可能是采用DES及AES两种方式来加密文件了，下面贴出的代码中包含了加解密文件的算法。下面具体贴出本人收藏的各种加密算法代码。
1、DES加密字符串及文件等
如果想可逆的算法，这种方式一般不错，只要结合动态密钥，就可以做出强度比较高的加密应用了。
#region DES对称加密解密 public const string DEFAULT_ENCRYPT_KEY = "12345678"; /// <summary> /// 使用默认加密 /// </summary> /// <param name="strText"></param> /// <returns></returns> public static string DesEncrypt(string strText) { try { return DesEncrypt(strText, DEFAULT_ENCRYPT_KEY); } catch { return ""; } } /// <summary> /// 使用默认解密 /// </summary> /// <param name="strText"></param> /// <returns></returns> public static string DesDecrypt(string strText) { try { return DesDecrypt(strText, DEFAULT_ENCRYPT_KEY); } catch { return ""; } } /// <summary> /// Encrypt the string /// Attention:key must be 8 bits /// </summary> /// <param name="strText">string</param> /// <param name="strEncrKey">key</param> /// <returns></returns> public static string DesEncrypt(string strText, string strEncrKey) { byte[] byKey = null; byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF }; byKey = Encoding.UTF8.GetBytes(strEncrKey.Substring(0, 8)); DESCryptoServiceProvider des = new DESCryptoServiceProvider(); byte[] inputByteArray = Encoding.UTF8.GetBytes(strText); MemoryStream ms = new MemoryStream(); CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write); cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); return Convert.ToBase64String(ms.ToArray()); } /// <summary> /// Decrypt string /// Attention:key must be 8 bits /// </summary> /// <param name="strText">Decrypt string</param> /// <param name="sDecrKey">key</param> /// <returns>output string</returns> public static string DesDecrypt(string strText, string sDecrKey) { byte[] byKey = null; byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF }; byte[] inputByteArray = new Byte[strText.Length]; byKey = Encoding.UTF8.GetBytes(sDecrKey.Substring(0, 8)); DESCryptoServiceProvider des = new DESCryptoServiceProvider(); inputByteArray = Convert.FromBase64String(strText); MemoryStream ms = new MemoryStream(); CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write); cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); Encoding encoding = new UTF8Encoding(); return encoding.GetString(ms.ToArray()); } /// <summary> /// Encrypt files /// Attention:key must be 8 bits /// </summary> /// <param name="m_InFilePath">Encrypt file path</param> /// <param name="m_OutFilePath">output file</param> /// <param name="strEncrKey">key</param> public static void DesEncrypt(string m_InFilePath, string m_OutFilePath, string strEncrKey) { byte[] byKey = null; byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF }; byKey = Encoding.UTF8.GetBytes(strEncrKey.Substring(0, 8)); FileStream fin = new FileStream(m_InFilePath, FileMode.Open, FileAccess.Read); FileStream fout = new FileStream(m_OutFilePath, FileMode.OpenOrCreate, FileAccess.Write); fout.SetLength(0); //Create variables to help with read and write. byte[] bin = new byte[100]; //This is intermediate storage for the encryption. long rdlen = 0; //This is the total number of bytes written. long totlen = fin.Length; //This is the total length of the input file. int len; //This is the number of bytes to be written at a time. DES des = new DESCryptoServiceProvider(); CryptoStream encStream = new CryptoStream(fout, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write); //Read from the input file, then encrypt and write to the output file. while (rdlen < totlen) { len = fin.Read(bin, 0, 100); encStream.Write(bin, 0, len); rdlen = rdlen + len; } encStream.Close(); fout.Close(); fin.Close(); } /// <summary> /// Decrypt files /// Attention:key must be 8 bits /// </summary> /// <param name="m_InFilePath">Decrypt filepath</param> /// <param name="m_OutFilePath">output filepath</param> /// <param name="sDecrKey">key</param> public static void DesDecrypt(string m_InFilePath, string m_OutFilePath, string sDecrKey) { byte[] byKey = null; byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF }; byKey = Encoding.UTF8.GetBytes(sDecrKey.Substring(0, 8)); FileStream fin = new FileStream(m_InFilePath, FileMode.Open, FileAccess.Read); FileStream fout = new FileStream(m_OutFilePath, FileMode.OpenOrCreate, FileAccess.Write); fout.SetLength(0); //Create variables to help with read and write. byte[] bin = new byte[100]; //This is intermediate storage for the encryption. long rdlen = 0; //This is the total number of bytes written. long totlen = fin.Length; //This is the total length of the input file. int len; //This is the number of bytes to be written at a time. DES des = new DESCryptoServiceProvider(); CryptoStream encStream = new CryptoStream(fout, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write); //Read from the input file, then encrypt and write to the output file. while (rdlen < totlen) { len = fin.Read(bin, 0, 100); encStream.Write(bin, 0, len); rdlen = rdlen + len; } encStream.Close(); fout.Close(); fin.Close(); } #endregion
2、 对称加密算法AES RijndaelManaged加密解密
#region 对称加密算法AES RijndaelManaged加密解密
private static readonly string Default_AES_Key = "@#kim123"; private static byte[] Keys = { 0x41, 0x72, 0x65, 0x79, 0x6F, 0x75, 0x6D, 0x79, 0x53,0x6E, 0x6F, 0x77, 0x6D, 0x61, 0x6E, 0x3F }; /// <summary> /// 对称加密算法AES RijndaelManaged加密(RijndaelManaged（AES）算法是块式加密算法) /// </summary> /// <param name="encryptString">待加密字符串</param> /// <returns>加密结果字符串</returns> public static string AES_Encrypt(string encryptString) { return AES_Encrypt(encryptString, Default_AES_Key); } /// <summary> /// 对称加密算法AES RijndaelManaged加密(RijndaelManaged（AES）算法是块式加密算法) /// </summary> /// <param name="encryptString">待加密字符串</param> /// <param name="encryptKey">加密密钥，须半角字符</param> /// <returns>加密结果字符串</returns> public static string AES_Encrypt(string encryptString, string encryptKey) { encryptKey = GetSubString(encryptKey, 32, ""); encryptKey = encryptKey.PadRight(32, ‘ ‘); RijndaelManaged rijndaelProvider = new RijndaelManaged(); rijndaelProvider.Key = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 32)); rijndaelProvider.IV = Keys; ICryptoTransform rijndaelEncrypt = rijndaelProvider.CreateEncryptor(); byte[] inputData = Encoding.UTF8.GetBytes(encryptString); byte[] encryptedData = rijndaelEncrypt.TransformFinalBlock(inputData, 0, inputData.Length); return Convert.ToBase64String(encryptedData); } /// <summary> /// 对称加密算法AES RijndaelManaged解密字符串 /// </summary> /// <param name="decryptString">待解密的字符串</param> /// <returns>解密成功返回解密后的字符串,失败返源串</returns> public static string AES_Decrypt(string decryptString) { return AES_Decrypt(decryptString, Default_AES_Key); } /// <summary> /// 对称加密算法AES RijndaelManaged解密字符串 /// </summary> /// <param name="decryptString">待解密的字符串</param> /// <param name="decryptKey">解密密钥,和加密密钥相同</param> /// <returns>解密成功返回解密后的字符串,失败返回空</returns> public static string AES_Decrypt(string decryptString, string decryptKey) { try { decryptKey = GetSubString(decryptKey, 32, ""); decryptKey = decryptKey.PadRight(32, ‘ ‘); RijndaelManaged rijndaelProvider = new RijndaelManaged(); rijndaelProvider.Key = Encoding.UTF8.GetBytes(decryptKey); rijndaelProvider.IV = Keys; ICryptoTransform rijndaelDecrypt = rijndaelProvider.CreateDecryptor(); byte[] inputData = Convert.FromBase64String(decryptString); byte[] decryptedData = rijndaelDecrypt.TransformFinalBlock(inputData, 0, inputData.Length); return Encoding.UTF8.GetString(decryptedData); } catch { return string.Empty; } } /// <summary> /// 按字节长度(按字节,一个汉字为2个字节)取得某字符串的一部分 /// </summary> /// <param name="sourceString">源字符串</param> /// <param name="length">所取字符串字节长度</param> /// <param name="tailString">附加字符串(当字符串不够长时，尾部所添加的字符串，一般为"...")</param> /// <returns>某字符串的一部分</returns> private static string GetSubString(string sourceString, int length, string tailString) { return GetSubString(sourceString, 0, length, tailString); } /// <summary> /// 按字节长度(按字节,一个汉字为2个字节)取得某字符串的一部分 /// </summary> /// <param name="sourceString">源字符串</param> /// <param name="startIndex">索引位置，以0开始</param> /// <param name="length">所取字符串字节长度</param> /// <param name="tailString">附加字符串(当字符串不够长时，尾部所添加的字符串，一般为"...")</param> /// <returns>某字符串的一部分</returns> private static string GetSubString(string sourceString, int startIndex, int length, string tailString) { string myResult = sourceString; //当是日文或韩文时(注:中文的范围:\u4e00 - \u9fa5, 日文在\u0800 - \u4e00, 韩文为\xAC00-\xD7A3) if (System.Text.RegularExpressions.Regex.IsMatch(sourceString, "[\u0800-\u4e00]+") || System.Text.RegularExpressions.Regex.IsMatch(sourceString, "[\xAC00-\xD7A3]+")) { //当截取的起始位置超出字段串长度时 if (startIndex >= sourceString.Length) { return string.Empty; } else { return sourceString.Substring(startIndex, ((length + startIndex) > sourceString.Length) ? (sourceString.Length - startIndex) : length); } } //中文字符，如"中国人民abcd123" if (length <= 0) { return string.Empty; } byte[] bytesSource = Encoding.Default.GetBytes(sourceString); //当字符串长度大于起始位置 if (bytesSource.Length > startIndex) { int endIndex = bytesSource.Length; //当要截取的长度在字符串的有效长度范围内 if (bytesSource.Length > (startIndex + length)) { endIndex = length + startIndex; } else { //当不在有效范围内时,只取到字符串的结尾 length = bytesSource.Length - startIndex; tailString = ""; } int[] anResultFlag = new int[length]; int nFlag = 0; //字节大于127为双字节字符 for (int i = startIndex; i < endIndex; i++) { if (bytesSource[i] > 127) { nFlag++; if (nFlag == 3) { nFlag = 1; } } else { nFlag = 0; } anResultFlag[i] = nFlag; } //最后一个字节为双字节字符的一半 if ((bytesSource[endIndex - 1] > 127) && (anResultFlag[length - 1] == 1)) { length = length + 1; } byte[] bsResult = new byte[length]; Array.Copy(bytesSource, startIndex, bsResult, 0, length); myResult = Encoding.Default.GetString(bsResult); myResult = myResult + tailString; return myResult; } return string.Empty; } /// <summary> /// 加密文件流 /// </summary> /// <param name="fs"></param> /// <returns></returns> public static CryptoStream AES_EncryptStrream(FileStream fs, string decryptKey) { decryptKey = GetSubString(decryptKey, 32, ""); decryptKey = decryptKey.PadRight(32, ‘ ‘); RijndaelManaged rijndaelProvider = new RijndaelManaged(); rijndaelProvider.Key = Encoding.UTF8.GetBytes(decryptKey); rijndaelProvider.IV = Keys; ICryptoTransform encrypto = rijndaelProvider.CreateEncryptor(); CryptoStream cytptostreamEncr = new CryptoStream(fs, encrypto, CryptoStreamMode.Write); return cytptostreamEncr; } /// <summary> /// 解密文件流 /// </summary> /// <param name="fs"></param> /// <returns></returns> public static CryptoStream AES_DecryptStream(FileStream fs, string decryptKey) { decryptKey = GetSubString(decryptKey, 32, ""); decryptKey = decryptKey.PadRight(32, ‘ ‘); RijndaelManaged rijndaelProvider = new RijndaelManaged(); rijndaelProvider.Key = Encoding.UTF8.GetBytes(decryptKey); rijndaelProvider.IV = Keys; ICryptoTransform Decrypto = rijndaelProvider.CreateDecryptor(); CryptoStream cytptostreamDecr = new CryptoStream(fs, Decrypto, CryptoStreamMode.Read); return cytptostreamDecr; } /// <summary> /// 对指定文件加密 /// </summary> /// <param name="InputFile"></param> /// <param name="OutputFile"></param> /// <returns></returns> public static bool AES_EncryptFile(string InputFile, string OutputFile) { try { string decryptKey = "www.iqidi.com"; FileStream fr = new FileStream(InputFile, FileMode.Open); FileStream fren = new FileStream(OutputFile, FileMode.Create); CryptoStream Enfr = AES_EncryptStrream(fren, decryptKey); byte[] bytearrayinput = new byte[fr.Length]; fr.Read(bytearrayinput, 0, bytearrayinput.Length); Enfr.Write(bytearrayinput, 0, bytearrayinput.Length); Enfr.Close(); fr.Close(); fren.Close(); } catch { //文件异常 return false; } return true; } /// <summary> /// 对指定的文件解压缩 /// </summary> /// <param name="InputFile"></param> /// <param name="OutputFile"></param> /// <returns></returns> public static bool AES_DecryptFile(string InputFile, string OutputFile) { try { string decryptKey = "www.iqidi.com"; FileStream fr = new FileStream(InputFile, FileMode.Open); FileStream frde = new FileStream(OutputFile, FileMode.Create); CryptoStream Defr = AES_DecryptStream(fr, decryptKey); byte[] bytearrayoutput = new byte[1024]; int m_count = 0; do { m_count = Defr.Read(bytearrayoutput, 0, bytearrayoutput.Length); frde.Write(bytearrayoutput, 0, m_count); if (m_count < bytearrayoutput.Length) break; } while (true); Defr.Close(); fr.Close(); frde.Close(); } catch { //文件异常 return false; } return true; } #endregion
3、 Base64加密解密算法
#region Base64加密解密 /// <summary> /// Base64是一種使用64基的位置計數法。它使用2的最大次方來代表僅可列印的ASCII 字元。 /// 這使它可用來作為電子郵件的傳輸編碼。在Base64中的變數使用字元A-Z、a-z和0-9 ， /// 這樣共有62個字元，用來作為開始的64個數字，最後兩個用來作為數字的符號在不同的 /// 系統中而不同。 /// Base64加密 /// </summary> /// <param name="str"></param> /// <returns></returns> public static string Base64Encrypt(string str) { byte[] encbuff = System.Text.Encoding.UTF8.GetBytes(str); return Convert.ToBase64String(encbuff); } /// <summary> /// Base64解密 /// </summary> /// <param name="str"></param> /// <returns></returns> public static string Base64Decrypt(string str) { byte[] decbuff = Convert.FromBase64String(str); return System.Text.Encoding.UTF8.GetString(decbuff); } #endregion
4、 MD5加密及验证
MD5的加密处理应用还是比较多，由于破解难度很大，基本上大型网站或者软件商，密码加密一般采用这种方式居多。
而MD5可以用来获得32、 16、8等全部部分内容加密内容，也可以获取其加密后的哈希值。
/// 获得32位的MD5加密 /// </summary> /// <param name="input"></param> /// <returns></returns> public static string GetMD5_32(string input) { System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create(); byte[] data = md5.ComputeHash(System.Text.Encoding.Default.GetBytes(input)); StringBuilder sb = new StringBuilder(); for (int i = 0; i < data.Length; i++) { sb.Append(data[i].ToString("x2")); } return sb.ToString(); } /// <summary> /// 获得16位的MD5加密 /// </summary> /// <param name="input"></param> /// <returns></returns> public static string GetMD5_16(string input) { return GetMD5_32(input).Substring(8, 16); } /// <summary> /// 获得8位的MD5加密 /// </summary> /// <param name="input"></param> /// <returns></returns> public static string GetMD5_8(string input) { return GetMD5_32(input).Substring(8, 8); } /// <summary> /// 获得4位的MD5加密 /// </summary> /// <param name="input"></param> /// <returns></returns> public static string GetMD5_4(string input) { return GetMD5_32(input).Substring(8, 4); } public static string MD5EncryptHash(String input) { MD5 md5 = new MD5CryptoServiceProvider(); //the GetBytes method returns byte array equavalent of a string byte[] res = md5.ComputeHash(Encoding.Default.GetBytes(input), 0, input.Length); char[] temp = new char[res.Length]; //copy to a char array which can be passed to a String constructor Array.Copy(res, temp, res.Length); //return the result as a string return new String(temp); }
5、 对文件添加MD5标签及验证
这种方式比较有趣，我也是最近才发现其中的奥妙，其实我们为了防止文件被修改，可以采用这种方式预先添加MD5码，然后在程序代码中进行验证，这样至少可以减少部分篡改的行为吧，因为只要文件有些少的修改，Md5码将会发生变化的，呵呵。
#region MD5签名验证 /// <summary> /// 对给定文件路径的文件加上标签 /// </summary> /// <param name="path">要加密的文件的路径</param> /// <returns>标签的值</returns> public static bool AddMD5(string path) { bool IsNeed = true; if (CheckMD5(path)) //已进行MD5处理 IsNeed = false; try { FileStream fsread = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read); byte[] md5File = new byte[fsread.Length]; fsread.Read(md5File, 0, (int)fsread.Length); // 将文件流读取到Buffer中 fsread.Close(); if (IsNeed) { string result = MD5Buffer(md5File, 0, md5File.Length); // 对Buffer中的字节内容算MD5 byte[] md5 = System.Text.Encoding.ASCII.GetBytes(result); // 将字符串转换成字节数组以便写人到文件中 FileStream fsWrite = new FileStream(path, FileMode.Open, FileAccess.ReadWrite); fsWrite.Write(md5File, 0, md5File.Length); // 将文件，MD5值 重新写入到文件中。 fsWrite.Write(md5, 0, md5.Length); fsWrite.Close(); } else { FileStream fsWrite = new FileStream(path, FileMode.Open, FileAccess.ReadWrite); fsWrite.Write(md5File, 0, md5File.Length); fsWrite.Close(); } } catch { return false; } return true; } /// <summary> /// 对给定路径的文件进行验证 /// </summary> /// <param name="path"></param> /// <returns>是否加了标签或是否标签值与内容值一致</returns> public static bool CheckMD5(string path) { try { FileStream get_file = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read); byte[] md5File = new byte[get_file.Length]; // 读入文件 get_file.Read(md5File, 0, (int)get_file.Length); get_file.Close(); string result = MD5Buffer(md5File, 0, md5File.Length - 32); // 对文件除最后32位以外的字节计算MD5，这个32是因为标签位为32位。 string md5 = System.Text.Encoding.ASCII.GetString(md5File, md5File.Length - 32, 32); //读取文件最后32位，其中保存的就是MD5值 return result == md5; } catch { return false; } } /// <summary> /// 计算文件的MD5值 /// </summary> /// <param name="MD5File">MD5签名文件字符数组</param> /// <param name="index">计算起始位置</param> /// <param name="count">计算终止位置</param> /// <returns>计算结果</returns> private static string MD5Buffer(byte[] MD5File, int index, int count) { System.Security.Cryptography.MD5CryptoServiceProvider get_md5 = new System.Security.Cryptography.MD5CryptoServiceProvider(); byte[] hash_byte = get_md5.ComputeHash(MD5File, index, count); string result = System.BitConverter.ToString(hash_byte); result = result.Replace("-", ""); return result; } #endregion
6、 SHA256加密算法
/// SHA256函数 /// </summary> /// <param name="str">原始字符串</param> /// <returns>SHA256结果(返回长度为44字节的字符串)</returns> public static string SHA256(string str) { byte[] SHA256Data = Encoding.UTF8.GetBytes(str); SHA256Managed Sha256 = new SHA256Managed(); byte[] Result = Sha256.ComputeHash(SHA256Data); return Convert.ToBase64String(Result); //返回长度为44字节的字符串 }
7、 MD5及Base64结合加密
这种结合方式也是比较不错的算法，至少是四不像，一般分析比较困难，比较有迷惑性，就是挂羊头，卖狗肉的行为，其实Base64加密方式，也可以做的比较复杂，不一定是上面的那种解决方式的，你可以添加一些较为复杂的算法在里面的
/// 加密字符串 /// </summary> /// <param name="input"></param> /// <returns></returns> public static string EncryptString(string input) { return MD5Util.AddMD5Profix(Base64Util.Encrypt(MD5Util.AddMD5Profix(input))); //return Base64.Encrypt(MD5.AddMD5Profix(Base64.Encrypt(input))); } /// <summary> /// 解密加过密的字符串 /// </summary> /// <param name="input"></param> /// <param name="throwException">解密失败是否抛异常</param> /// <returns></returns> public static string DecryptString(string input, bool throwException) { string res = ""; try { res = input;// Base64.Decrypt(input); if (MD5Util.ValidateValue(res)) { return MD5Util.RemoveMD5Profix(Base64Util.Decrypt(MD5Util.RemoveMD5Profix(res))); } else { throw new Exception("字符串无法转换成功！"); } } catch { if (throwException) { throw; } else { return ""; } } } //-----------下面是MD5Util下面的函数 /// <summary> /// 添加MD5的前缀，便于检查有无篡改 /// </summary> /// <param name="input"></param> /// <returns></returns> public static string AddMD5Profix(string input) { return GetMD5_4(input) + input; } /// <summary> /// 移除MD5的前缀 /// </summary> /// <param name="input"></param> /// <returns></returns> public static string RemoveMD5Profix(string input) { return input.Substring(4); } /// <summary> /// 验证MD5前缀处理的字符串有无被篡改 /// </summary> /// <param name="input"></param> /// <returns></returns> public static bool ValidateValue(string input) { bool res = false; if (input.Length >= 4) { string tmp = input.Substring(4); if (input.Substring(0, 4) == GetMD5_4(tmp)) { res = true; } } return res; }
如下面代码就是上面提到的Base64Util中的内容，好像算法处理还是比较麻烦，也贴出来大家研读一下吧。
/// <summary> /// 基于Base64的加密编码， /// 可以设置不同的密码表来获取不同的编码合解码 /// </summary> public class Base64Util { public Base64Util() { this.InitDict(); } protected static Base64Util s_b64 = new Base64Util(); /// <summary> /// 使用默认的密码表加密字符串 /// </summary> /// <param name="input"></param> /// <returns></returns> public static string Encrypt(string input) { return s_b64.Encode(input); } /// <summary> /// 使用默认的密码表解密字符串 /// </summary> /// <param name="input"></param> /// <returns></returns> public static string Decrypt(string input) { return s_b64.Decode(input); } /// <summary> /// 获取具有标准的Base64密码表的加密类 /// </summary> /// <returns></returns> public static Base64Util GetStandardBase64() { Base64Util b64 = new Base64Util(); b64.Pad = "="; b64.CodeTable = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; return b64; } protected string m_codeTable = @"ABCDEFGHIJKLMNOPQRSTUVWXYZbacdefghijklmnopqrstu_wxyz0123456789*-"; protected string m_pad = "v"; protected Dictionary<int, char> m_t1 = new Dictionary<int, char>(); protected Dictionary<char, int> m_t2 = new Dictionary<char, int>(); /// <summary> /// 密码表 /// </summary> public string CodeTable { get { return m_codeTable; } set { if (value == null) { throw new Exception("密码表不能为null"); } else if (value.Length < 64) { throw new Exception("密码表长度必须至少为64"); } else { this.ValidateRepeat(value); this.ValidateEqualPad(value, m_pad); m_codeTable = value; this.InitDict(); } } } /// <summary> /// 补码 /// </summary> public string Pad { get { return m_pad; } set { if (value == null) { throw new Exception("密码表的补码不能为null"); } else if (value.Length != 1) { throw new Exception("密码表的补码长度必须为1"); } else { this.ValidateEqualPad(m_codeTable, value); m_pad = value; this.InitDict(); } } } /// <summary> /// 返回编码后的字符串 /// </summary> /// <param name="source"></param> /// <returns></returns> public string Encode(string source) { if (source == null || source == "") { return ""; } else { StringBuilder sb = new StringBuilder(); byte[] tmp = System.Text.UTF8Encoding.UTF8.GetBytes(source); int remain = tmp.Length % 3; int patch = 3 - remain; if (remain != 0) { Array.Resize(ref tmp, tmp.Length + patch); } int cnt = (int)Math.Ceiling(tmp.Length * 1.0 / 3); for (int i = 0; i < cnt; i++) { sb.Append(this.EncodeUnit(tmp[i * 3], tmp[i * 3 + 1], tmp[i * 3 + 2])); } if (remain != 0) { sb.Remove(sb.Length - patch, patch); for (int i = 0; i < patch; i++) { sb.Append(m_pad); } } return sb.ToString(); } } protected string EncodeUnit(params byte[] unit) { int[] obj = new int[4]; obj[0] = (unit[0] & 0xfc) >> 2; obj[1] = ((unit[0] & 0x03) << 4) + ((unit[1] & 0xf0) >> 4); obj[2] = ((unit[1] & 0x0f) << 2) + ((unit[2] & 0xc0) >> 6); obj[3] = unit[2] & 0x3f; StringBuilder sb = new StringBuilder(); for (int i = 0; i < obj.Length; i++) { sb.Append(this.GetEC((int)obj[i])); } return sb.ToString(); } protected char GetEC(int code) { return m_t1[code];//m_codeTable[code]; } /// <summary> /// 获得解码字符串 /// </summary> /// <param name="source"></param> /// <returns></returns> public string Decode(string source) { if (source == null || source == "") { return ""; } else { List<byte> list = new List<byte>(); char[] tmp = source.ToCharArray(); int remain = tmp.Length % 4; if (remain != 0) { Array.Resize(ref tmp, tmp.Length - remain); } int patch = source.IndexOf(m_pad); if (patch != -1) { patch = source.Length - patch; } int cnt = tmp.Length / 4; for (int i = 0; i < cnt; i++) { this.DecodeUnit(list, tmp[i * 4], tmp[i * 4 + 1], tmp[i * 4 + 2], tmp[i * 4 + 3]); } for (int i = 0; i < patch; i++) { list.RemoveAt(list.Count - 1); } return System.Text.Encoding.UTF8.GetString(list.ToArray()); } } protected void DecodeUnit(List<byte> byteArr, params char[] chArray) { int[] res = new int[3]; byte[] unit = new byte[chArray.Length]; for (int i = 0; i < chArray.Length; i++) { unit[i] = this.FindChar(chArray[i]); } res[0] = (unit[0] << 2) + ((unit[1] & 0x30) >> 4); res[1] = ((unit[1] & 0xf) << 4) + ((unit[2] & 0x3c) >> 2); res[2] = ((unit[2] & 0x3) << 6) + unit[3]; for (int i = 0; i < res.Length; i++) { byteArr.Add((byte)res[i]); } } protected byte FindChar(char ch) { int pos = m_t2[ch];//m_codeTable.IndexOf(ch); return (byte)pos; } /// <summary> /// 初始化双向哈西字典 /// </summary> protected void InitDict() { m_t1.Clear(); m_t2.Clear(); m_t2.Add(m_pad[0], -1); for (int i = 0; i < m_codeTable.Length; i++) { m_t1.Add(i, m_codeTable[i]); m_t2.Add(m_codeTable[i], i); } } /// <summary> /// 检查字符串中的字符是否有重复 /// </summary> /// <param name="input"></param> /// <returns></returns> protected void ValidateRepeat(string input) { for (int i = 0; i < input.Length; i++) { if (input.LastIndexOf(input[i]) > i) { throw new Exception("密码表中含有重复字符：" + input[i]); } } } /// <summary> /// 检查字符串是否包含补码字符 /// </summary> /// <param name="input"></param> /// <param name="pad"></param> protected void ValidateEqualPad(string input, string pad) { if (input.IndexOf(pad) > -1) { throw new Exception("密码表中包含了补码字符：" + pad); } } }
个人以前用的加密类 DESC+MD5 使用时候需直接使用 EncryptDate(string Date, string Key1, string Key2) Key1 与Key2的值可以自己定，我用的时候是
defultKey1与 defultKey2 这俩个值，将密码更复杂了一下。
public class MyEncrypt { public string Key2; public string Key1; public string defultKey1 = "fHezg0ouyQ4="; public string defultKey2 = "gSIoPdlJGgY="; public string EncryptDate(string Date) { byte[] keyBytes = Convert.FromBase64String(Key1); byte[] keyIV = Convert.FromBase64String(Key2); byte[] inputByteArray = Encoding.UTF8.GetBytes(Date); DESCryptoServiceProvider provider = new DESCryptoServiceProvider(); MemoryStream mStream = new MemoryStream(); CryptoStream cStream = new CryptoStream(mStream, provider.CreateEncryptor(keyBytes, keyIV), CryptoStreamMode.Write); cStream.Write(inputByteArray, 0, inputByteArray.Length); cStream.FlushFinalBlock(); return Convert.ToBase64String(mStream.ToArray()); } public static string EncryptDate(string Date, string Key1, string Key2) { MyEncrypt encrypt = new MyEncrypt(); encrypt.Key1 = Key1; encrypt.Key2 = Key2; return encrypt.EncryptDate(Date + getMd5Hash(getMac() + DateTime.Now.ToFileTime())); } static string getMd5Hash(string input) { MD5CryptoServiceProvider md5Hasher = new MD5CryptoServiceProvider(); // 输入的字符串转换为字节数组，并计算哈希值。 byte[] data = md5Hasher.ComputeHash(Encoding.UTF8.GetBytes(input)); // 创建一个新的StringBuilder收集字节 // and create a string. StringBuilder sBuilder = new StringBuilder(); // 遍历每个字节的散列数据 // 每一个格式化为十六进制字符串 for (int i = 0; i < data.Length; i++) { sBuilder.Append(data[i].ToString("x2")); } // 返回的十六进制字符串。 return sBuilder.ToString(); } private static string getMac() { string mac = ""; Random r = new Random(); mac = System.DateTime.Now.ToFileTime().ToString() + r.Next().ToString(); return mac; } }
AES 加密 与解密
/// <summary> /// AES 加密 /// </summary> /// <param name="toEncrypt">加密的字符串</param> /// <param name="key">算法密匙</param> /// <param name="iv">对称算法初始化向量</param> /// <returns></returns> public static string Encrypt(string toEncrypt, string key, string iv) { byte[] keyArray = UTF8Encoding.UTF8.GetBytes(key); byte[] ivArray = UTF8Encoding.UTF8.GetBytes(iv); byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toEncrypt); RijndaelManaged rDel = new RijndaelManaged(); rDel.Key = keyArray; rDel.IV = ivArray; rDel.Mode = CipherMode.CBC; rDel.Padding = PaddingMode.Zeros; ICryptoTransform cTransform = rDel.CreateEncryptor(); byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length); return Convert.ToBase64String(resultArray, 0, resultArray.Length); } /// <summary> /// AES 解密 /// </summary> /// <param name="toDecrypt">解密的字符串</param> /// <param name="key">算法密匙</param> /// <param name="iv">对称算法初始化向量</param> /// <returns></returns> public static string Decrypt(string toDecrypt, string key, string iv) { byte[] keyArray = UTF8Encoding.UTF8.GetBytes(key); byte[] ivArray = UTF8Encoding.UTF8.GetBytes(iv); byte[] toEncryptArray = Convert.FromBase64String(toDecrypt); RijndaelManaged rDel = new RijndaelManaged(); rDel.Key = keyArray; rDel.IV = ivArray; rDel.Mode = CipherMode.CBC; rDel.Padding = PaddingMode.Zeros; ICryptoTransform cTransform = rDel.CreateDecryptor(); byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length); return UTF8Encoding.UTF8.GetString(resultArray); }
加密写法大概也就是这么多种，根据个人需求选择，也可以自己修改设定一下，这东西一般用例子很多，喜欢的朋友可以收藏一下。
标签：des style blog http io ar color os 使用
原文地址：http://www.cnblogs.com/yuanye0918/p/4137857.html
