AES 是一个新的可以用于保护电子数据的加密算法。明确地说，AES 是一个迭代的、对称密钥分组的密码，它可以使用128、192 和 256 位密钥，并且用 128 位（16字节）分组加密和解密数据。与公共密钥密码使用密钥对不同，对称密钥密码使用相同的密钥加密和解密数据。通过分组密码返回的加密数据 的位数与输入数据相同。迭代加密使用一个循环结构，在该循环中重复置换（permutations ）和替换(substitutions）输入数据。
需要加入引用 using System.Security.Cryptography;
/// <summary>
/// 有密码的AES加密
/// </summary>
/// <param name="text"> 加密字符 </param>
/// <param name="password"> 加密的密码 </param>
/// <param name="iv"> 密钥 </param>
/// <returns></returns>
public static string AESEncrypt( string text, string password, string iv)
{
RijndaelManaged rijndaelCipher = new RijndaelManaged();
rijndaelCipher.Mode = CipherMode.CBC;
rijndaelCipher.Padding = PaddingMode.PKCS7;
rijndaelCipher.KeySize = 128 ;
rijndaelCipher.BlockSize = 128 ;
byte [] pwdBytes = System.Text.Encoding.UTF8.GetBytes(password);
byte [] keyBytes = new byte [ 16 ];
int len = pwdBytes.Length;
if (len > keyBytes.Length) len = keyBytes.Length;
System.Array.Copy(pwdBytes, keyBytes, len);
rijndaelCipher.Key = keyBytes;
byte [] ivBytes = System.Text.Encoding.UTF8.GetBytes(iv);
rijndaelCipher.IV = ivBytes;
ICryptoTransform transform = rijndaelCipher.CreateEncryptor();
byte [] plainText = Encoding.UTF8.GetBytes(text);
byte [] cipherBytes = transform.TransformFinalBlock(plainText, 0 , plainText.Length);
return Convert.ToBase64String(cipherBytes);
}
/// <summary>
/// 随机生成密钥
/// </summary>
/// <returns></returns>
public static string GetIv( int n)
{
char [] arrChar = new char []{
' a ' , ' b ' , ' d ' , ' c ' , ' e ' , ' f ' , ' g ' , ' h ' , ' i ' , ' j ' , ' k ' , ' l ' , ' m ' , ' n ' , ' p ' , ' r ' , ' q ' , ' s ' , ' t ' , ' u ' , ' v ' , ' w ' , ' z ' , ' y ' , ' x ' ,
' 0 ' , ' 1 ' , ' 2 ' , ' 3 ' , ' 4 ' , ' 5 ' , ' 6 ' , ' 7 ' , ' 8 ' , ' 9 ' ,
' A ' , ' B ' , ' C ' , ' D ' , ' E ' , ' F ' , ' G ' , ' H ' , ' I ' , ' J ' , ' K ' , ' L ' , ' M ' , ' N ' , ' Q ' , ' P ' , ' R ' , ' T ' , ' S ' , ' V ' , ' U ' , ' W ' , ' X ' , ' Y ' , ' Z '
};
StringBuilder num = new StringBuilder();
Random rnd = new Random(DateTime.Now.Millisecond);
for ( int i = 0 ; i < n; i ++ )
{
num.Append(arrChar[rnd.Next( 0 , arrChar.Length)].ToString());
}
return num.ToString();
}
/// <summary>
/// AES解密
/// </summary>
/// <param name="text"></param>
/// <param name="password"></param>
/// <param name="iv"></param>
/// <returns></returns>
public static string AESDecrypt( string text, string password, string iv)
{
RijndaelManaged rijndaelCipher = new RijndaelManaged();
rijndaelCipher.Mode = CipherMode.CBC;
rijndaelCipher.Padding = PaddingMode.PKCS7;
rijndaelCipher.KeySize = 128 ;
rijndaelCipher.BlockSize = 128 ;
byte [] encryptedData = Convert.FromBase64String(text);
byte [] pwdBytes = System.Text.Encoding.UTF8.GetBytes(password);
byte [] keyBytes = new byte [ 16 ];
int len = pwdBytes.Length;
if (len > keyBytes.Length) len = keyBytes.Length;
System.Array.Copy(pwdBytes, keyBytes, len);
rijndaelCipher.Key = keyBytes;
byte [] ivBytes = System.Text.Encoding.UTF8.GetBytes(iv);
rijndaelCipher.IV = ivBytes;
ICryptoTransform transform = rijndaelCipher.CreateDecryptor();
byte [] plainText = transform.TransformFinalBlock(encryptedData, 0 , encryptedData.Length);
return Encoding.UTF8.GetString(plainText);
}