Flutter加密通信插件x25519的使用
Flutter加密通信插件x25519的使用
标题
Flutter加密通信插件x25519的使用
内容
Dart port of Curve25519
Usage
import 'package:x25519/x255119.dart';
void genKeyAndX25519() {
var aliceKeyPair = generateKeyPair();
var bobKeyPair = generateKeyPair();
var aliceSharedKey = X25519(aliceKeyPair.privateKey, bobKeyPair.publicKey);
var bobSharedKey = X25519(bobKeyPair.privateKey, aliceKeyPair.publicKey);
assert(ListEquality().equals(aliceSharedKey, bobSharedKey));
}
void useX25519() {
const expectedHex =
'89161fde887b2b53de549af483940106ecc114d6982daa98256de23bdf77661a';
var x = List<int>.filled(32, 0);
x[0] = 1;
for (var i = 0; i < 200; i++) {
x = X25519(x, basePoint);
}
assert(HEX.encode(x) == expectedHex);
}
示例代码
import 'package:collection/collection.dart';
import 'package:hex/hex.dart';
import 'package:x25519/x25519.dart';
void genKeyAndX25519() {
var aliceKeyPair = generateKeyPair();
var bobKeyPair = generateKeyPair();
var aliceSharedKey = X25519(aliceKeyPair.privateKey, bobKeyPair.publicKey);
var bobSharedKey = X25519(bobKeyPair.privateKey, aliceKeyPair.publicKey);
assert(ListEquality().equals(aliceSharedKey, bobSharedKey));
}
void useX25519() {
const expectedHex =
'89161fde887b2b53de549af483940106ecce114d6982daa98256de23bdf77661a';
var x = List<int>.filled(32, 0);
x[0] = 1;
for (var i = 0; i < 200; i++) {
x = X25519(x, basePoint);
}
assert(HEX.encode(x) == expectedHex);
}
更多关于Flutter加密通信插件x25519的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
更多关于Flutter加密通信插件x25519的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
在Flutter中实现基于x25519的加密通信,你可以使用pointycastle
这个Dart库,它提供了多种加密算法的实现,包括x25519。虽然Flutter本身没有直接提供x25519的插件,但你可以通过pointycastle
来实现。
以下是一个简单的示例,展示了如何在Flutter中使用pointycastle
库进行x25519密钥交换和加密通信:
-
添加依赖: 首先,你需要在
pubspec.yaml
文件中添加pointycastle
依赖:dependencies: flutter: sdk: flutter pointycastle: ^3.0.1 # 确保版本号是最新的
-
导入库: 在你的Dart文件中导入
pointycastle
库:import 'package:pointycastle/export.dart'; import 'dart:typed_data';
-
生成密钥对: 使用
X25519KeyPairGenerator
生成x25519密钥对:SecureRandom secureRandom = FortunaRandom(); X25519KeyPairGenerator keyPairGenerator = X25519KeyPairGenerator(); keyPairGenerator.init(ParametersWithRandom(null, secureRandom)); AsymmetricKeyPair<PublicKey, PrivateKey> keyPair = keyPairGenerator.generateKeyPair(); Uint8List privateKey = keyPair.private.encoded; Uint8List publicKey = keyPair.public.encoded;
-
密钥交换: 假设你有对方的公钥,你可以使用自己的私钥和对方的公钥进行密钥交换:
Uint8List theirPublicKey = ...; // 从对方获取的公钥 X25519PrivateKeyParameters privateKeyParams = X25519PrivateKeyParameters(privateKey); X25519PublicKeyParameters publicKeyParams = X25519PublicKeyParameters(theirPublicKey); X25519KeyAgreement keyAgreement = X25519KeyAgreement(); keyAgreement.init(privateKeyParams); BigInteger sharedSecret = keyAgreement.processKey(publicKeyParams); Uint8List sharedSecretBytes = sharedSecret.toByteArrayUnsigned();
-
加密和解密: 使用共享密钥进行对称加密和解密。这里可以使用AES等对称加密算法:
import 'package:pointycastle/api.dart'; import 'package:pointycastle/block/aes.dart'; import 'package:pointycastle/paddings/pkcs7.dart'; import 'package:pointycastle/modes/cbc.dart'; SecureRandom aesRandom = FortunaRandom(); KeyParameter aesKey = KeyParameter(sharedSecretBytes.sublist(0, 32)); // AES-256 PaddedBufferedBlockCipher cipher = PaddedBufferedBlockCipher(CBCBlockCipher(AESFastEngine())); ParametersWithIV<KeyParameter> aesParams = ParametersWithIV<KeyParameter>(aesKey, Uint8List(16).fillRange(0, 16, (i) => aesRandom.nextInt(256))); cipher.init(true, aesParams); // 初始化为加密模式 Uint8List input = Uint8List.fromList('Hello, Flutter!'.codeUnits); Uint8List encrypted = cipher.processBytes(input, 0, input.length); Uint8List encryptedFinal = cipher.doFinal(); Uint8List encryptedData = Uint8List.concat([encrypted, encryptedFinal]); cipher.init(false, aesParams); // 初始化为解密模式 Uint8List decrypted = cipher.processBytes(encryptedData, 0, encryptedData.length); Uint8List decryptedFinal = cipher.doFinal(); Uint8List decryptedData = Uint8List.concat([decrypted, decryptedFinal]); String decryptedText = String.fromCharCodes(decryptedData); print('Decrypted Text: $decryptedText'); // 应该输出: Hello, Flutter!
这个示例展示了如何在Flutter中使用pointycastle
库进行x25519密钥交换,并使用生成的共享密钥进行AES加密和解密。请注意,这只是一个简单的示例,实际使用中你可能需要处理更多的边缘情况和安全性问题。