Flutter 和 C# 中的加密和解密問題

Question

我使用以下鏈接在 Flutter 中使用加密： https : //pub.dev/packages/encrypt

代碼是

    final plainText = 'some plain text here';
    final key = encrypt.Key.fromUtf8('16 characters key');
    final iv = IV.fromLength(16);
    final encrypter = Encrypter(AES(key,mode: AESMode.cbc,padding: 'PKCS7'));
    final encrypted = encrypter.encrypt(plainText, iv: iv);
    final decrypted = encrypter.decrypt(encrypted, iv: iv);
    print(decrypted); 
    print(encrypted.base64);

C# 代碼（用於解密）

public static String TestDecrypt(String encryptedText)
{
    var encryptedBytes = Convert.FromBase64String(encryptedText);
    return Encoding.UTF8.GetString(Decrypt(encryptedBytes, GetRijndaelManaged("16 characters key")));
}

public static RijndaelManaged GetRijndaelManaged(String secretKey)
{
     var keyBytes = new byte[16];
     var secretKeyBytes = Encoding.UTF8.GetBytes(secretKey);

     Array.Copy(secretKeyBytes, keyBytes, Math.Min(keyBytes.Length, secretKeyBytes.Length));

     return new RijndaelManaged
        {
            Mode = CipherMode.CBC,
            Padding = PaddingMode.PKCS7,
            KeySize = 128,
            BlockSize = 128,
            Key = keyBytes,
            IV = keyBytes
        };
}

我在 flutter dart 代碼中加密了一些明文，但是在使用 c# 代碼解密加密文本后我沒有得到正確的純文本。

我收到一條消息

填充無效且無法移除

Answer 1

在顫動中使用線下

final iv = IV.fromUtf8('16 個字符鍵');

Answer 2

這對我有用： 鍵：

String keySTR = "16 characters"; //16 byte
String ivSTR = "16 characters"; //16 byte

撲

final plainText = 'Works!';

final key = encrypt.Key.fromUtf8(keySTR);
final iv = encrypt.IV.fromUtf8(ivSTR);
final encrypter = encrypt.Encrypter(encrypt.AES(key,mode: encrypt.AESMode.cbc,padding: 'PKCS7'));
final encrypted = encrypter.encrypt(plainText, iv: iv);
final decrypted = encrypter.decrypt(encrypted, iv: iv);
print('decrypted:'+decrypted);
print('encrypted.base64:'+encrypted.base64);

        

C＃

using (System.Security.Cryptography.RijndaelManaged rjm = 
                        new System.Security.Cryptography.RijndaelManaged 
                            { 
                                KeySize = 128, 
                                BlockSize = 128, 
                                Key = ASCIIEncoding.ASCII.GetBytes(keySTR),
                                IV = ASCIIEncoding.ASCII.GetBytes(ivSTR) 
                            }
            )
        {           
                Byte[] input = Encoding.UTF8.GetBytes(stringToEncrypt);
                Byte[] output = rjm.CreateEncryptor().TransformFinalBlock(input, 0, input.Length);
                return Convert.ToBase64String(output);                
        }
    }