///
/// <returns>密文</returns>
public static string EncodeAES( string text,  string key, string iv)RijndaelManaged rijndaelCipher =  new RijndaelManaged();rijndaelCipher.Mode = CipherMode.CBC;rijndaelCipher.Padding = PaddingMode.Zeros;rijndaelCipher.KeySize = 128;rijndaelCipher.BlockSize = 128;byte [] pwdBytes = System.Text.Encoding.UTF8.GetBytes(key);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;rijndaelCipher.IV = Encoding.UTF8.GetBytes(iv);ICryptoTransform transform = rijndaelCipher.CreateEncryptor();byte [] plainText = Encoding.UTF8.GetBytes(text);byte [] cipherBytes = transform.TransformFinalBlock(plainText, 0, plainText.Length);return Convert.ToBase64String(cipherBytes);
///
/// <returns>明文</returns>
public static string DecodeAES( string text,  string key, string iv)RijndaelManaged rijndaelCipher =  new RijndaelManaged();rijndaelCipher.Mode = CipherMode.CBC;rijndaelCipher.Padding = PaddingMode.Zeros;rijndaelCipher.KeySize = 128;rijndaelCipher.BlockSize = 128;byte [] encryptedData = Convert.FromBase64String(text);byte [] pwdBytes = System.Text.Encoding.UTF8.GetBytes(key);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;rijndaelCipher.IV = Encoding.UTF8.GetBytes(iv);ICryptoTransform transform = rijndaelCipher.CreateDecryptor();byte [] plainText = transform.TransformFinalBlock(encryptedData, 0, encryptedData.Length);return Encoding.UTF8.GetString(plainText);
Original: https://www.cnblogs.com/Alex80/p/15950527.html
Author: 大西瓜3721
Title: C#与Java互通AES算法加密解密
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