Dart에서 복제하려는 Java 코드가 있습니다 (클래스는 여기 에서 찾을 수 있습니다 )
/**
* Encrypt object with password
* @param data Object to be encrypted
* @param secret Password to use for encryption
* @return Encrypted version of object
*/
public static EncryptedBytes encrypt(String data, SecretKey secret) throws InvalidKeyException {
try {
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, secret);
// properly encode the complete ciphertext
//logEncrypt(password, object);
byte[] encodedData = cipher.doFinal(Base64.getEncoder().encode(data.getBytes(Charset.forName("UTF-8"))));
byte[] params = cipher.getParameters().getEncoded();
String paramAlgorithm = cipher.getParameters().getAlgorithm();
return new EncryptedBytes(encodedData, params, paramAlgorithm);
} catch (NoSuchAlgorithmException | IllegalBlockSizeException | NoSuchPaddingException | BadPaddingException | IOException e) {
e.printStackTrace();
}
return null;
}
/**
* Decrypt data with secret
* @param encryptedBytes Object to be decrypted
* @param secret Password to use for decryption
* @return Decrypted version of object
*/
public static String decrypt(EncryptedBytes encryptedBytes, @NonNull SecretKey secret) throws InvalidKeyException {
try {
// get parameter object for password-based encryption
AlgorithmParameters algParams = AlgorithmParameters.getInstance(encryptedBytes.getParamAlgorithm());
// initialize with parameter encoding from above
algParams.init(encryptedBytes.getParams());
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, secret, algParams);
return new String(Base64.getDecoder().decode(cipher.doFinal(encryptedBytes.getData())), Charset.forName("UTF-8"));
} catch (NoSuchAlgorithmException | NoSuchPaddingException | BadPaddingException | IllegalBlockSizeException | IOException | InvalidAlgorithmParameterException e) {
e.printStackTrace();
}
return null;
}
EncryptedBytes 클래스는 단순히 데이터 홀더입니다.
@RequiredArgsConstructor
@Getter
public class EncryptedBytes {
private final byte[] data;
private final byte[] params;
private final String paramAlgorithm;
}
지금 Dart에서 저는 PointyCastle을 사용하고 있으며이 정도까지 끝냈습니다 (테스트하지는 않았습니다).
static EncryptedBytes encrypt(String data, KeyParameter keyParameter) {
final AESFastEngine aes = AESFastEngine()..init(false, keyParameter); // false=decrypt
Uint8List encryptedData = aes.process(utf8.encode(data)); // Needs to convert to UTF8 then Base64 and finally be encrypted
Uint8List params;
String algorithm = aes.algorithmName;
return EncryptedBytes(encryptedData, params, algorithm);
}
static String decrypt(EncryptedBytes data, KeyParameter keyParameter) {
final AESFastEngine aes = AESFastEngine()..init(true, keyParameter); // true=encrypt
String encryptedData = utf8.decode(aes.process(data.data)); // Needs to be decrypted, then decoded from Base64 and finally UTF8
return encryptedData;
}
나는 Dart에서 위의 자바 코드와 동등한 것을 얻기 위해 무엇을 사용할 수 있는지 완전히 확신하지 못합니다. Base64는 인코딩을 위해 문자열을 반환하고 디코딩을 위해 문자열을 요구하는 반면 aes.process ()는 Uint8List를 요구하고 반환합니다.
다음은 Java로 인코딩하고 pointycastle에서 디코딩하는 작업 예제입니다.
자바
String plainText = "Hello World!";
KeyGenerator generator = KeyGenerator.getInstance("AES");
generator.init(256);
SecretKey secret = generator.generateKey();
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, secret);
byte[] encodedData = cipher.doFinal(Base64.getEncoder().encode(plainText.getBytes(StandardCharsets.UTF_8)));
Base64.Encoder encoder = Base64.getEncoder();
System.out.println(encoder.encodeToString(secret.getEncoded()));
System.out.println(encoder.encodeToString(cipher.getParameters().getEncoded())); // the DER encoded IV
System.out.println(encoder.encodeToString(encodedData));
다트
import 'dart:convert';
import 'dart:typed_data';
import 'package:pointycastle/export.dart';
void main() {
// the following 3 values were output from the above Java code
var key = base64.decode('9JYmap3xB79oyBkY6ZIdJCXaOr/CurCK8XUsRZL9XXI=');
var params = base64.decode('BBChkSMIq/v35PRRWAJGwtTr');
var cipherText =
base64.decode('Dh+lg2IMzcLC0toDRSoNMAQoR7MWKMLMPRi7KtdQdmw=');
var iv = params.sublist(2); // strip the 4, 16 DER header
var cipher = PaddedBlockCipherImpl(
PKCS7Padding(),
CBCBlockCipher(AESFastEngine()),
);
cipher.init(
false /*decrypt*/,
PaddedBlockCipherParameters<CipherParameters, CipherParameters>(
ParametersWithIV<KeyParameter>(KeyParameter(key), iv),
null,
),
);
var plainishText = cipher.process(cipherText);
print(utf8.decode(base64.decode(utf8.decode(plainishText))));
}
Dart에서 암호화
var key = Uint8List(32); // the 256 bit key
var plainText = 'Ciao Mondo';
var random = Random.secure();
var params = Uint8List(18)
..[0] = 4
..[1] = 16;
for (int i = 2; i < 18; i++) {
params[i] = random.nextInt(256);
}
var iv = params.sublist(2);
var cipher = PaddedBlockCipherImpl(
PKCS7Padding(),
CBCBlockCipher(AESFastEngine()),
)..init(
true /*encrypt*/,
PaddedBlockCipherParameters<CipherParameters, CipherParameters>(
ParametersWithIV<KeyParameter>(KeyParameter(key), iv),
null,
),
);
var plainBytes = utf8.encode(base64.encode(utf8.encode(plainText)));
var cipherText = cipher.process(plainBytes);
// cipherText is the cipher text
// params is the Java compatible params
이 기사는 인터넷에서 수집됩니다. 재 인쇄 할 때 출처를 알려주십시오.
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