AesManaged - 高级加密标准(AES) 对称算法的管理类
1 public static class EncryptAndDecrypt 2 { 3 //加密 4 public static string Encrypt(string input) 5 { 6 // 盐值 7 string saltValue = "saltValue"; 8 // 密码值 9 string pwdValue = "pwdValue"; 10 byte[] data = System.Text.UTF8Encoding.UTF8.GetBytes(input); 11 byte[] salt = System.Text.UTF8Encoding.UTF8.GetBytes(saltValue); 12 // AesManaged - 高级加密标准(AES) 对称算法的管理类 13 System.Security.Cryptography.AesManaged aes = new System.Security.Cryptography.AesManaged(); 14 // Rfc2898DeriveBytes - 通过使用基于 HMACSHA1 的伪随机数生成器,实现基于密码的密钥派生功能 (PBKDF2 - 一种基于密码的密钥派生函数) 15 // 通过 密码 和 salt 派生密钥 16 System.Security.Cryptography.Rfc2898DeriveBytes rfc = new System.Security.Cryptography.Rfc2898DeriveBytes(pwdValue, salt); 17 /**/ 18 /* 19 * AesManaged.BlockSize - 加密操作的块大小(单位:bit) 20 * AesManaged.LegalBlockSizes - 对称算法支持的块大小(单位:bit) 21 * AesManaged.KeySize - 对称算法的密钥大小(单位:bit) 22 * AesManaged.LegalKeySizes - 对称算法支持的密钥大小(单位:bit) 23 * AesManaged.Key - 对称算法的密钥 24 * AesManaged.IV - 对称算法的密钥大小 25 * Rfc2898DeriveBytes.GetBytes(int 需要生成的伪随机密钥字节数) - 生成密钥 26 */ 27 aes.BlockSize = aes.LegalBlockSizes[0].MaxSize; 28 aes.KeySize = aes.LegalKeySizes[0].MaxSize; 29 aes.Key = rfc.GetBytes(aes.KeySize / 8); 30 aes.IV = rfc.GetBytes(aes.BlockSize / 8); 31 // 用当前的 Key 属性和初始化向量 IV 创建对称加密器对象 32 System.Security.Cryptography.ICryptoTransform encryptTransform = aes.CreateEncryptor(); 33 // 加密后的输出流 34 System.IO.MemoryStream encryptStream = new System.IO.MemoryStream(); 35 // 将加密后的目标流(encryptStream)与加密转换(encryptTransform)相连接 36 System.Security.Cryptography.CryptoStream encryptor = new System.Security.Cryptography.CryptoStream 37 (encryptStream, encryptTransform, System.Security.Cryptography.CryptoStreamMode.Write); 38 // 将一个字节序列写入当前 CryptoStream (完成加密的过程) 39 encryptor.Write(data, 0, data.Length); 40 encryptor.Close(); 41 // 将加密后所得到的流转换成字节数组,再用Base64编码将其转换为字符串 42 string encryptedString = Convert.ToBase64String(encryptStream.ToArray()); 43 return encryptedString; 44 } 45 46 47 #region silverlight密码解密 48 /**/ 49 /// <summary> 50 /// 解密数据 51 /// </summary> 52 /// <param name="input">加密后的字符串</param> 53 /// <returns>加密前的字符串</returns> 54 public static string Decrypt(string input) 55 { 56 // 盐值(与加密时设置的值一致) 57 string saltValue = "saltValue"; 58 // 密码值(与加密时设置的值一致) 59 string pwdValue = "pwdValue"; 60 byte[] encryptBytes = Convert.FromBase64String(input); 61 byte[] salt = Encoding.UTF8.GetBytes(saltValue); 62 System.Security.Cryptography.AesManaged aes = new System.Security.Cryptography.AesManaged(); 63 System.Security.Cryptography.Rfc2898DeriveBytes rfc = new System.Security.Cryptography.Rfc2898DeriveBytes(pwdValue, salt); 64 aes.BlockSize = aes.LegalBlockSizes[0].MaxSize; 65 aes.KeySize = aes.LegalKeySizes[0].MaxSize; 66 aes.Key = rfc.GetBytes(aes.KeySize / 8); 67 aes.IV = rfc.GetBytes(aes.BlockSize / 8); 68 // 用当前的 Key 属性和初始化向量 IV 创建对称解密器对象 69 System.Security.Cryptography.ICryptoTransform decryptTransform = aes.CreateDecryptor(); 70 // 解密后的输出流 71 MemoryStream decryptStream = new MemoryStream(); 72 // 将解密后的目标流(decryptStream)与解密转换(decryptTransform)相连接 73 System.Security.Cryptography.CryptoStream decryptor = new System.Security.Cryptography.CryptoStream( 74 decryptStream, decryptTransform, System.Security.Cryptography.CryptoStreamMode.Write); 75 // 将一个字节序列写入当前 CryptoStream (完成解密的过程) 76 decryptor.Write(encryptBytes, 0, encryptBytes.Length); 77 decryptor.Close(); 78 // 将解密后所得到的流转换为字符串 79 byte[] decryptBytes = decryptStream.ToArray(); 80 string decryptedString = UTF8Encoding.UTF8.GetString(decryptBytes, 0, decryptBytes.Length); 81 return decryptedString; 82 } 83 #endregion 84 }