AES encryption and decrytion

    public class AESHelper{/// <summary>/// 默认密钥-密钥的长度必须是32/// </summary>//private const string PublicKey = "123";static string PublicKey = System.Configuration.ConfigurationManager.AppSettings["AESKey"];/// <summary>/// 默认向量/// </summary>//private const string Iv = "123";static string Iv = System.Configuration.ConfigurationManager.AppSettings["AESV"];/// <summary>  /// AES加密  /// </summary>  /// <param name="str">需要加密字符串</param>  /// <returns>加密后字符串</returns>  public static String Encrypt(string str){return Encrypt(str, PublicKey);}/// <summary>  /// AES解密  /// </summary>  /// <param name="str">需要解密字符串</param>  /// <returns>解密后字符串</returns>  public static String Decrypt(string str){return Decrypt(str, PublicKey);}/// <summary>/// AES加密/// </summary>/// <param name="str">需要加密的字符串</param>/// <param name="key">32位密钥</param>/// <returns>加密后的字符串</returns>public static string Encrypt(string str, string key){Byte[] keyArray = System.Text.Encoding.UTF8.GetBytes(key);Byte[] toEncryptArray = System.Text.Encoding.UTF8.GetBytes(str);var rijndael = new System.Security.Cryptography.RijndaelManaged();rijndael.Key = keyArray;rijndael.Mode = System.Security.Cryptography.CipherMode.CBC;rijndael.Padding = System.Security.Cryptography.PaddingMode.PKCS7;rijndael.IV = System.Text.Encoding.UTF8.GetBytes(Iv);System.Security.Cryptography.ICryptoTransform cTransform = rijndael.CreateEncryptor();Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);return Convert.ToBase64String(resultArray, 0, resultArray.Length);}/// <summary>/// AES解密/// </summary>/// <param name="str">需要解密的字符串</param>/// <param name="key">32位密钥</param>/// <returns>解密后的字符串</returns>public static string Decrypt(string str, string key){Byte[] keyArray = System.Text.Encoding.UTF8.GetBytes(key);Byte[] toEncryptArray = Convert.FromBase64String(str);var rijndael = new System.Security.Cryptography.RijndaelManaged();rijndael.Key = keyArray;rijndael.Mode = System.Security.Cryptography.CipherMode.CBC;rijndael.Padding = System.Security.Cryptography.PaddingMode.PKCS7;rijndael.IV = System.Text.Encoding.UTF8.GetBytes(Iv);System.Security.Cryptography.ICryptoTransform cTransform = rijndael.CreateDecryptor();Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);return System.Text.Encoding.UTF8.GetString(resultArray);}}