c# AES加解密并转ASCII码

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace AESDecryptDemo
{
public class AES
{
public static string AESEncryptASCII(string plainStr)
{
StringBuilder sb = new StringBuilder();
byte[] bKey = Encoding.UTF8.GetBytes(GetKey());
byte[] bIV = Encoding.UTF8.GetBytes(GetIV());
byte[] byteArray = Encoding.UTF8.GetBytes(plainStr);

string encrypt = null;
Rijndael aes = Rijndael.Create();
using (MemoryStream mStream = new MemoryStream())
{
using (CryptoStream cStream = new CryptoStream(mStream, aes.CreateEncryptor(bKey, bIV), CryptoStreamMode.Write))
{
cStream.Write(byteArray, 0, byteArray.Length);
cStream.FlushFinalBlock();
encrypt = Encode(Convert.ToBase64String(mStream.ToArray()));
}
}
aes.Clear();
return encrypt;
}
public static string AESEncrypt(string plainStr)
{
StringBuilder sb = new StringBuilder();
byte[] bKey = Encoding.UTF8.GetBytes(GetKey());
byte[] bIV = Encoding.UTF8.GetBytes(GetIV());
byte[] byteArray = Encoding.UTF8.GetBytes(plainStr);

string encrypt = null;
Rijndael aes = Rijndael.Create();
using (MemoryStream mStream = new MemoryStream())
{
using (CryptoStream cStream = new CryptoStream(mStream, aes.CreateEncryptor(bKey, bIV), CryptoStreamMode.Write))
{
cStream.Write(byteArray, 0, byteArray.Length);
cStream.FlushFinalBlock();
encrypt = Convert.ToBase64String(mStream.ToArray());
}
}
aes.Clear();
return encrypt;
}
public static string AESDecryptASCII(string encryptStr)
{
encryptStr = Decode(encryptStr);
byte[] bKey = Encoding.UTF8.GetBytes(GetKey());
byte[] bIV = Encoding.UTF8.GetBytes(GetIV());
byte[] byteArray = Convert.FromBase64String(encryptStr);

string decrypt = null;
Rijndael aes = Rijndael.Create();
using (MemoryStream mStream = new MemoryStream())
{
using (CryptoStream cStream = new CryptoStream(mStream, aes.CreateDecryptor(bKey, bIV), CryptoStreamMode.Write))
{
cStream.Write(byteArray, 0, byteArray.Length);
cStream.FlushFinalBlock();
decrypt = Encoding.UTF8.GetString(mStream.ToArray());
}
}
aes.Clear();
return decrypt;
}
public static string AESDecrypt(string encryptStr)
{
byte[] bKey = Encoding.UTF8.GetBytes(GetKey());
byte[] bIV = Encoding.UTF8.GetBytes(GetIV());
byte[] byteArray = Convert.FromBase64String(encryptStr);

string decrypt = null;
Rijndael aes = Rijndael.Create();
using (MemoryStream mStream = new MemoryStream())
{
using (CryptoStream cStream = new CryptoStream(mStream, aes.CreateDecryptor(bKey, bIV), CryptoStreamMode.Write))
{
cStream.Write(byteArray, 0, byteArray.Length);
cStream.FlushFinalBlock();
decrypt = Encoding.UTF8.GetString(mStream.ToArray());
}
}
aes.Clear();
return decrypt;
}
public static string Encode(string strEncode)
{
string strReturn = "";//  存储转换后的编码
foreach (short shortx in strEncode.ToCharArray())
{
strReturn += shortx.ToString("X");
}
return strReturn;
}

public static string Decode(string strDecode)
{
string sResult = "";
for (int i = 0; i < strDecode.Length / 2; i++)
{
sResult += (char)short.Parse(strDecode.Substring(i * 2, 2), global::System.Globalization.NumberStyles.HexNumber);
}
return sResult;
}
private static string GetKey()
{
return @")O[NB]6,YF}+efcaj{+oESb9d8>Z'e9M";
}

/// <summary>
/// 获取向量
/// </summary>
private static string GetIV()
{
return @"L+\~f4,Ir)b$=pkf";
}
}
}