public class EncryptHepler {
// 验值
static string saltValue = "XXXX";
// 密码值
static string pwdValue = "XXXX";
/// <summary>
/// 加密
/// </summary>
public static string Encrypt( string input ) {
byte[ ] data = System.Text.UTF8Encoding.UTF8.GetBytes( input );
byte[ ] salt = System.Text.UTF8Encoding.UTF8.GetBytes( saltValue );
// AesManaged - 高级加密标准(AES) 对称算法的管理类
System.Security.Cryptography.AesManaged aes = new System.Security.Cryptography.AesManaged( );
// 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)
// 通过 密码 和 salt 派生密钥
System.Security.Cryptography.Rfc2898DeriveBytes rfc = new System.Security.Cryptography.Rfc2898DeriveBytes( pwdValue, salt );
aes.BlockSize = aes.LegalBlockSizes[0].MaxSize;
aes.KeySize = aes.LegalKeySizes[0].MaxSize;
aes.Key = rfc.GetBytes( aes.KeySize / 8 );
aes.IV = rfc.GetBytes( aes.BlockSize / 8 );
// 用当前的 Key 属性和初始化向量 IV 创建对称加密器对象
System.Security.Cryptography.ICryptoTransform encryptTransform = aes.CreateEncryptor( );
// 加密后的输出流
System.IO.MemoryStream encryptStream = new System.IO.MemoryStream( );
// 将加密后的目标流（encryptStream）与加密转换（encryptTransform）相连接
System.Security.Cryptography.CryptoStream encryptor = new System.Security.Cryptography.CryptoStream
( encryptStream, encryptTransform, System.Security.Cryptography.CryptoStreamMode.Write );
// 将一个字节序列写入当前 CryptoStream （完成加密的过程）
encryptor.Write( data, 0, data.Length );
encryptor.Close( );
// 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
string encryptedString = Convert.ToBase64String( encryptStream.ToArray( ) );
return encryptedString;
}
/// <summary>
/// 解密
/// </summary>
public static string Decrypt( string input ) {
byte[ ] encryptBytes = Convert.FromBase64String( input );
byte[ ] salt = Encoding.UTF8.GetBytes( saltValue );
System.Security.Cryptography.AesManaged aes = new System.Security.Cryptography.AesManaged( );
System.Security.Cryptography.Rfc2898DeriveBytes rfc = new System.Security.Cryptography.Rfc2898DeriveBytes( pwdValue, salt );
aes.BlockSize = aes.LegalBlockSizes[0].MaxSize;
aes.KeySize = aes.LegalKeySizes[0].MaxSize;
aes.Key = rfc.GetBytes( aes.KeySize / 8 );
aes.IV = rfc.GetBytes( aes.BlockSize / 8 );
// 用当前的 Key 属性和初始化向量 IV 创建对称解密器对象
System.Security.Cryptography.ICryptoTransform decryptTransform = aes.CreateDecryptor( );
// 解密后的输出流
System.IO.MemoryStream decryptStream = new System.IO.MemoryStream( );
// 将解密后的目标流（decryptStream）与解密转换（decryptTransform）相连接
System.Security.Cryptography.CryptoStream decryptor = new System.Security.Cryptography.CryptoStream(
decryptStream, decryptTransform, System.Security.Cryptography.CryptoStreamMode.Write );
// 将一个字节序列写入当前 CryptoStream （完成解密的过程）
decryptor.Write( encryptBytes, 0, encryptBytes.Length );
decryptor.Close( );
// 将解密后所得到的流转换为字符串
byte[ ] decryptBytes = decryptStream.ToArray( );
string decryptedString = UTF8Encoding.UTF8.GetString( decryptBytes, 0, decryptBytes.Length );
return decryptedString;
}
}//class end
