NET中各种加密解密方法
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/// <summary> /// 各种加密解密方法 /// </summary> public static class EncryptDemo { /// <summary> /// AES对称加密和分组加密中的四种模式(ECB、CBC、CFB、OFB),这三种的区别，主要来自于密钥的长度，16位密钥=128位，24位密钥=192位，32位密钥=256位 /// 检验密钥是否有效长度【16|24|32】 /// </summary> /// <param name="key">密钥</param> /// <returns>bool</returns> private static bool AesCheckKey(string key) { if (string.IsNullOrWhiteSpace(key)) return false; if (16.Equals(key.Length) || 24.Equals(key.Length) || 32.Equals(key.Length)) return true; else return false; } #region 参数是string类型的 /// <summary> /// AES加密 参数：string /// </summary> /// <param name="source">源字符串</param> /// <param name="key">密钥</param> /// <param name="model">运算模式</param> /// <param name="padding">填充模式</param> /// <param name="encoding">编码类型</param> /// <returns>加密后的字符串</returns> public static string AesEncrypt(string source, string key, CipherMode model = CipherMode.ECB, PaddingMode padding = PaddingMode.PKCS7, Encoding encoding = null) { if (string.IsNullOrWhiteSpace(source)) return null; if (!AesCheckKey(key)) return source; if (encoding == null) encoding = Encoding.UTF8; using (AesCryptoServiceProvider aesProvider = new AesCryptoServiceProvider()) { aesProvider.Key = encoding.GetBytes(key); aesProvider.Mode = model; aesProvider.Padding = padding; //aesProvider.KeySize = 128; //aesProvider.BlockSize = 128; using (ICryptoTransform cryptoTransform = aesProvider.CreateEncryptor()) { byte[] toEncryptArray = encoding.GetBytes(source); byte[] resultArray = cryptoTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length); aesProvider.Clear(); return Convert.ToBase64String(resultArray, 0, resultArray.Length); } } } /// <summary> /// AES解密 参数：string /// </summary> /// <param name="source">源字符串</param> /// <param name="key">密钥</param> /// <param name="model">运算模式</param> /// <param name="padding">填充模式</param> /// <param name="encoding">编码类型</param> /// <returns>解密后的字符串</returns> public static string AesDecrypt(string source, string key, CipherMode model = CipherMode.ECB, PaddingMode padding = PaddingMode.PKCS7, Encoding encoding = null) { if (string.IsNullOrWhiteSpace(source)) return null; if (!AesCheckKey(key)) return source; if (encoding == null) encoding = Encoding.UTF8; using (AesCryptoServiceProvider aesProvider = new AesCryptoServiceProvider()) { aesProvider.Key = encoding.GetBytes(key); aesProvider.Mode = model; aesProvider.Padding = padding; //aesProvider.KeySize = 128; //aesProvider.BlockSize = 128; using (ICryptoTransform cryptoTransform = aesProvider.CreateDecryptor()) { byte[] toEncryptArray = Convert.FromBase64String(source); byte[] resultArray = cryptoTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length); aesProvider.Clear(); return encoding.GetString(resultArray); } } } #endregion #region 参数是byte[]类型的 /// <summary> /// AES加密 参数：byte[] /// </summary> /// <param name="source">源字符字节组</param> /// <param name="key">密钥</param> /// <param name="model">运算模式</param> /// <param name="padding">填充模式</param> /// <param name="encoding">编码类型</param> /// <returns>加密后的字符字节组</returns> public static byte[] AesEncrypt(byte[] source, string key, CipherMode model = CipherMode.ECB, PaddingMode padding = PaddingMode.PKCS7, Encoding encoding = null) { if (source == null) return null; if (!AesCheckKey(key)) return source; if (encoding == null) encoding = Encoding.UTF8; byte[] bKey = encoding.GetBytes(key); byte[] cryptograph = null; // 加密后的密文 Rijndael Aes = Rijndael.Create(); Aes.Key = bKey; //开辟一块内存流 using (MemoryStream Memory = new MemoryStream()) { //把内存流对象包装成加密流对象 using (CryptoStream Encryptor = new CryptoStream(Memory, Aes.CreateEncryptor(), CryptoStreamMode.Write)) { //明文数据写入加密流 Encryptor.Write(source, 0, source.Length); Encryptor.FlushFinalBlock(); cryptograph = Memory.ToArray(); } } return cryptograph; } /// <summary> /// AES解密 参数：byte[] /// </summary> /// <param name="source">源字符字节组</param> /// <param name="key">密钥</param> /// <param name="model">运算模式</param> /// <param name="padding">填充模式</param> /// <param name="encoding">编码类型</param> /// <returns>解密后的字符字节组</returns> public static byte[] AesDecrypt(byte[] source, string key, CipherMode model = CipherMode.ECB, PaddingMode padding = PaddingMode.PKCS7, Encoding encoding = null) { if (source == null) return null; if (!AesCheckKey(key)) return source; if (encoding == null) encoding = Encoding.UTF8; byte[] bKey = encoding.GetBytes(key); byte[] original = null; // 解密后的明文 Rijndael Aes = Rijndael.Create(); //开辟一块内存流，存储密文 using (MemoryStream Memory = new MemoryStream(source)) { //把内存流对象包装成加密流对象 using (CryptoStream Decryptor = new CryptoStream(Memory, Aes.CreateDecryptor(bKey, null), CryptoStreamMode.Read)) { //明文存储区 using (MemoryStream originalMemory = new MemoryStream()) { byte[] Buffer = new byte[1024]; int readBytes = 0; while ((readBytes = Decryptor.Read(Buffer, 0, Buffer.Length)) > 0) { originalMemory.Write(Buffer, 0, readBytes); } original = originalMemory.ToArray(); } } } return original; } #endregion /// <summary> /// 对字符串SHA1加密 /// </summary> /// <param name="source">源字符串</param> /// <param name="encoding">编码类型</param> /// <returns>加密后的十六进制字符串</returns> public static string Sha1Encrypt(string source, Encoding encoding = null) { if (encoding == null) encoding = Encoding.UTF8; // 第一种方式 byte[] byteArray = encoding.GetBytes(source); using (HashAlgorithm hashAlgorithm = new SHA1CryptoServiceProvider()) { byteArray = hashAlgorithm.ComputeHash(byteArray); StringBuilder stringBuilder = new StringBuilder(256); foreach (byte item in byteArray) { stringBuilder.AppendFormat("{0:x2}", item); } hashAlgorithm.Clear(); return stringBuilder.ToString(); } //// 第二种方式 //using (SHA1 sha1 = SHA1.Create()) //{ // byte[] hash = sha1.ComputeHash(encoding.GetBytes(source)); // StringBuilder stringBuilder = new StringBuilder(); // for (int index = 0; index < hash.Length; ++index) // stringBuilder.Append(hash[index].ToString("x2")); // sha1.Clear(); // return stringBuilder.ToString(); //} } /// <summary> /// 对字符串MD5加密 /// </summary> /// <param name="source">源字符串</param> /// <param name="encoding">编码类型</param> /// <returns>加密后的十六进制字符串</returns> public static string Md5Encrypt(string source, Encoding encoding = null) { if (encoding == null) encoding = Encoding.UTF8; byte[] byteArray = encoding.GetBytes(source); using (HashAlgorithm hashAlgorithm = new MD5CryptoServiceProvider()) { byteArray = hashAlgorithm.ComputeHash(byteArray); StringBuilder stringBuilder = new StringBuilder(); foreach (byte item in byteArray) { stringBuilder.AppendFormat("{0:x2}", item); } hashAlgorithm.Clear(); return stringBuilder.ToString(); } } }
AES加密方式中关于PKCS5Padding与PKCS7Padding的区别
在PKCS5Padding中，明确定义Block的大小是8位，而在PKCS7Padding定义中，对于块的大小是不确定的，可以在1-255之间（块长度超出255的尚待研究），填充值的算法都是一样的：
value=k - (l mod k) ,K=块大小，l=数据长度，如果l=8, 则需要填充额外的8个byte的8
在.net中，例如TripleDESCryptoServiceProvider ，默认BlockSize=64bits=8bytes，所以在这种情况下在PKCS5Padding=PKCS7Padding。
如果在C#中自己定义了一个不是64bits的加密块大小，同时使用PKCS7Padding，那么在java中使用JDK标准的PKCS5Padding就不能解密了。
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