最近用到了 Aes加密 记录下

public class AesHelper
    {
        public static string EncryptStringToBase64String_Aes(string plainText, string Key, string IV, PaddingMode Padding = PaddingMode.PKCS7, CipherMode Mode = CipherMode.CBC)
        {
            return Convert.ToBase64String(EncryptStringToBytes_Aes(plainText, Key, IV, Padding, Mode));
        }

        public static byte[] EncryptStringToBytes_Aes(string plainText, string Key, string IV, PaddingMode Padding = PaddingMode.PKCS7, CipherMode Mode = CipherMode.CBC)
        {
            return EncryptStringToBytes_Aes(plainText, Encoding.UTF8.GetBytes(Key), Encoding.UTF8.GetBytes(IV), Padding, Mode);
        }

        public static byte[] EncryptStringToBytes_Aes(string plainText, byte[] Key, byte[] IV, PaddingMode Padding = PaddingMode.PKCS7, CipherMode Mode = CipherMode.CBC)
        {
            // Check arguments.
            if (plainText == null || plainText.Length <= 0)
                throw new ArgumentNullException("plainText");
            if (Key == null || Key.Length <= 0)
                throw new ArgumentNullException("Key");
            if (IV == null || IV.Length <= 0)
                throw new ArgumentNullException("IV");
            byte[] encrypted;

            // Create an Aes object
            // with the specified key and IV.
            using (Aes aesAlg = Aes.Create())
            {
                aesAlg.Key = Key;
                aesAlg.IV = IV;
                aesAlg.Padding = Padding;
                aesAlg.Mode = Mode;

                // Create an encryptor to perform the stream transform.
                ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);

                // Create the streams used for encryption.
                using (MemoryStream msEncrypt = new MemoryStream())
                {
                    using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
                    {
                        using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
                        {
                            //Write all data to the stream.
                            swEncrypt.Write(plainText);
                        }
                        encrypted = msEncrypt.ToArray();
                    }
                }
            }

            // Return the encrypted bytes from the memory stream.
            return encrypted;
        }

        public static string DecryptStringFromBase64String_Aes(string cipherText, string Key, string IV, PaddingMode Padding = PaddingMode.PKCS7, CipherMode Mode = CipherMode.CBC)
        {
            return DecryptStringFromString_Aes(Convert.FromBase64String(cipherText), Key, IV, Padding, Mode);
        }

        public static string DecryptStringFromString_Aes(byte[] cipherText, string Key, string IV, PaddingMode Padding = PaddingMode.PKCS7, CipherMode Mode = CipherMode.CBC)
        {
            return DecryptStringFromBytes_Aes(cipherText, Encoding.UTF8.GetBytes(Key), Encoding.UTF8.GetBytes(IV), Padding, Mode);
        }

        public static string DecryptStringFromBytes_Aes(byte[] cipherText, byte[] Key, byte[] IV, PaddingMode Padding = PaddingMode.PKCS7, CipherMode Mode = CipherMode.CBC)
        {
            // Check arguments.
            if (cipherText == null || cipherText.Length <= 0)
                throw new ArgumentNullException("cipherText");
            if (Key == null || Key.Length <= 0)
                throw new ArgumentNullException("Key");
            if (IV == null || IV.Length <= 0)
                throw new ArgumentNullException("IV");

            // Declare the string used to hold
            // the decrypted text.
            string plaintext = null;

            // Create an Aes object
            // with the specified key and IV.
            using (Aes aesAlg = Aes.Create())
            {
                aesAlg.Key = Key;
                aesAlg.IV = IV;
                aesAlg.Padding = Padding;
                aesAlg.Mode = Mode;

                // Create a decryptor to perform the stream transform.
                ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);

                // Create the streams used for decryption.
                using (MemoryStream msDecrypt = new MemoryStream(cipherText))
                {
                    using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
                    {
                        using (StreamReader srDecrypt = new StreamReader(csDecrypt))
                        {

                            // Read the decrypted bytes from the decrypting stream
                            // and place them in a string.
                            plaintext = srDecrypt.ReadToEnd();
                        }
                    }
                }
            }

            return plaintext;
        }
    }

16位密钥对应128位加密

24位密钥对应192位加密

32位密钥对应256位加密