Aes加密/解密示例

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

namespace AesEncrypt
{
/// <summary>
/// Aes加密算法适用于固定的加解密
/// </summary>
public static class AesEncrypt
{
/// <summary>
/// 对称算法的密钥
/// </summary>
private readonly static byte[] aesKey = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32 };
/// <summary>
/// 对称算法的初始化向量
/// </summary>
private readonly static byte[] aesIV = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };

/// <summary>
/// 加密
/// </summary>
/// <param name="Text">被加密的字符串</param>
/// <returns>Base64</returns>
public static string Encrypt(string Text)
{
byte[] encrypted;
encrypted = EncryptStringToBytes_Aes(Text, aesKey, aesIV);
return Convert.ToBase64String(encrypted);
}

private static byte[] EncryptStringToBytes_Aes(string plainText, byte[] Key, byte[] IV)
{
// 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;

// Create a decrytor 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;
}

/// <summary>
/// 解密
/// </summary>
/// <param name="text">被Aes加密后的Base64</param>
/// <returns>字符串</returns>
public static string Decrypt(string text)
{
string roundtrip;

byte[] myByte = Convert.FromBase64String(text);
roundtrip = DecryptStringFromBytes_Aes(myByte, aesKey, aesIV);

return roundtrip;
}
private static string DecryptStringFromBytes_Aes(byte[] cipherText, byte[] Key, byte[] IV)
{
// 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;

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

// Create a decrytor 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;
}
}
}

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

namespace AesEncrypt
{
/// <summary>
/// Aes扩展方法
/// </summary>
public class AesEncryptExtension
{

/// <summary>
/// 加密
/// </summary>
/// <param name="Text">被加密的字符串</param>
/// <param name="aesKey">对称算法的密钥</param>
/// <param name="aesIV">设置对称算法的初始化向量</param>
/// <returns>Base64</returns>
public string Encrypt(string Text, byte[] aesKey, byte[] aesIV)
{
byte[] encrypted;
encrypted = EncryptStringToBytes_Aes(Text, aesKey, aesIV);
return Convert.ToBase64String(encrypted);
}

private byte[] EncryptStringToBytes_Aes(string plainText, byte[] Key, byte[] IV)
{
// 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;

// Create a decrytor 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;
}

/// <summary>
/// 解密
/// </summary>
/// <param name="text">被Aes加密后的Base64</param>
/// <param name="aesKey">对称算法的密钥</param>
/// <param name="aesIV">设置对称算法的初始化向量</param>
/// <returns>字符串</returns>
public string Decrypt(string text, byte[] aesKey, byte[] aesIV)
{
string roundtrip;

byte[] myByte = Convert.FromBase64String(text);
roundtrip = DecryptStringFromBytes_Aes(myByte, aesKey, aesIV);

return roundtrip;
}
private string DecryptStringFromBytes_Aes(byte[] cipherText, byte[] Key, byte[] IV)
{
// 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;

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

// Create a decrytor 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;
}
}
}