我正在尝试将我们的安卓手机应用移植到Flutter。 它是用Java编写的。 然而,有这样一部分内容,我需要在将登录凭据和卡片详细信息发布到服务器之前使用RSA加密对其进行加密,但我始终无法正确操作。
我已经尝试了几个Flutter包,但没有成功。 根据Java开发人员的说法,有一个base64编码的公钥需要用于加密密码。
以下是Java代码
public static String Encrypt(String plaintext, String publicKey ) throws Exception {
try
{
if(StringUtils.isEmpty(plaintext)) return "";
byte[] modulusBytes = Base64.decode(publicKey.getBytes("UTF-8"),Base64.DEFAULT);
byte[] exponentBytes = Base64.decode("AQAB".getBytes("UTF-8"),Base64.DEFAULT);
BigInteger modulus = new BigInteger(1, modulusBytes );
BigInteger exponent = new BigInteger(1, exponentBytes);
RSAPublicKeySpec rsaPubKey = new RSAPublicKeySpec(modulus, exponent);
KeyFactory fact = KeyFactory.getInstance("RSA");
PublicKey pubKey = fact.generatePublic(rsaPubKey);
Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1PADDING");
cipher.init(Cipher.ENCRYPT_MODE, pubKey);
byte[] plainBytes = new String(plaintext).getBytes("UTF-8");
byte[] cipherData = cipher.doFinal( plainBytes );
String outputEncrypted = Base64.encodeToString(cipherData,Base64.NO_WRAP);
return outputEncrypted;
}catch (Exception ex)
{
Log.i("Exception", ex.getMessage());
throw ex;
}
}
如果能将此内容转换为Dart,以便在Flutter代码中使用,我将不胜感激。
更新
我尝试了@Richard Heap的PointyCastle加密,看起来很好用,但服务器无法解密该字符串。出现异常。
Interop+AppleCrypto+AppleCFErrorCryptographicException: The operation couldn’t be completed. (OSStatus error -2147415994 - CSSMERR_CSP_INVALID_DATA)
at Interop.AppleCrypto.ExecuteTransform(SecKeyTransform transform)
at Interop.AppleCrypto.RsaDecrypt(SafeSecKeyRefHandle privateKey, Byte[] data, RSAEncryptionPadding padding)
at System.Security.Cryptography.RSAImplementation.RSASecurityTransforms.Decrypt(Byte[] data, RSAEncryptionPadding padding)
at System.Security.Cryptography.RSACryptoServiceProvider.Decrypt(Byte[] rgb, Boolean fOAEP)
Internal.Cryptography.CryptoThrowHelper+WindowsCryptographicException: The parameter is incorrect
at Internal.NativeCrypto.CapiHelper.DecryptKey(SafeKeyHandle safeKeyHandle, Byte[] encryptedData, Int32 encryptedDataLength, Boolean fOAEP, Byte[]& decryptedData)
at System.Security.Cryptography.RSACryptoServiceProvider.Decrypt(Byte[] rgb, Boolean fOAEP
服务器上的解密方法是用C#编写的。
更新2
在漫长的谷歌搜索后,我终于把它搞定了。我发现了这个PointyCastle上的github问题,以及duncanhoggan提出的解决方案。结果证明,我只需要使用PKCS1Encoding即可。
var pubKey = RSAPublicKey(modulus, exponent);
var cipher = PKCS1Encoding(RSAEngine());
cipher.init(true, PublicKeyParameter<RSAPublicKey>(pubKey));
Uint8List output = cipher.process(utf8.encode(text));
var base64EncodedText = base64Encode(output);
return base64EncodedText;
@Richard Heap,感谢您的帮助。