增加加密方法

lib/encrpyt.dart

@@ -0,0 +1,89 @@
+// ignore_for_file: constant_identifier_names
+
+import 'dart:convert';
+
+import 'package:dart_des/dart_des.dart';
+import 'package:dart_sm/dart_sm.dart';
+import 'package:encrypt/encrypt.dart';
+import 'package:hex/hex.dart';
+import 'package:pointycastle/asymmetric/api.dart';
+
+/// JSON-RPC 加密配置
+class JsonRpcEncryptConfig {
+  /// 是否启用
+  final bool enable;
+
+  /// 加密方式
+  final String encryptMode;
+
+  /// 秘钥
+  final String encryptKey;
+
+  JsonRpcEncryptConfig({
+    this.enable = false,
+    this.encryptMode = "sm2",
+    this.encryptKey = "",
+  });
+
+  Map<String, dynamic> toJson() {
+    return {
+      "enable": enable,
+      "encryptMode": encryptMode,
+      "encryptKey": encryptKey,
+    };
+  }
+}
+
+abstract class JsonRpcEncryptUtils {
+  /// RSA公钥
+  static const _RSA_PUB_KEY = "-----BEGIN PUBLIC KEY-----\n"
+          "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAln7CnpiqYguFVRUL5oCdFAQL6ypYQdnd84XN++mRvjkdjtpbCdGEj6S2U2Vn+Bt+vHL5bvUk6gtTx5FpV0Z8kDvDgBRweIvtJTZLx6ZjbI7habxclW9aB3b0SW3zuFuHMteDivTI0lkZ6y0QRiG7nMZYsi18IjReBssXsx38fpgIBAHIbkb98wtEffBbrbwfdxQnfc8r9Hy7iIbfVP0h7nR0FDMu1vYqi5PsnYDw681iO6GNxV6VHA6wcWkMokLZn51OP+OQmomJPElWfPgLDp1AxBeRhuHFlXslcE550bzWUs3iBylTgXwdTGqppCjCXhSLBiOnTc0ggHpDQHh17wIDAQAB\n" +
+      "-----END PUBLIC KEY-----";
+
+  /// RSA加密
+  static String rsaEncrypt(String message) {
+    final publicKey = RSAKeyParser().parse(_RSA_PUB_KEY) as RSAPublicKey;
+    final encrypter = Encrypter(RSA(publicKey: publicKey));
+    // Encrypt the message using RSA-OAEP encryption
+    final encrypted = encrypter.encrypt(message);
+    final encryptedText = encrypted.base64;
+    return encryptedText;
+  }
+
+  /// DES解密
+  static String desDecrypt(String ciphertext, String key) {
+    // IV
+    const List<int> iv = [1, 2, 3, 4, 5, 6, 7, 8];
+    final ivHexString = String.fromCharCodes(iv);
+    final ivString = utf8.encode(ivHexString);
+
+    final DES desCBC = DES(
+      key: key.codeUnits,
+      mode: DESMode.CBC,
+      iv: ivString,
+      paddingType: DESPaddingType.PKCS7,
+    );
+
+    final ciphertextHexDecoded = HEX.decode(ciphertext);
+    final decryptedBytes = desCBC.decrypt(ciphertextHexDecoded);
+    final decryptedString = utf8.decode(decryptedBytes);
+    return decryptedString;
+  }
+
+  /// 国密2加密
+  static String sm2Encrypt(String message, String key) {
+    // 1 - C1C3C2；	0 - C1C2C3；	默认为1
+    const int cipherMode = 1; // 特别注意,此处前后端需保持一致
+
+    // 加密结果
+    String encryptData = SM2.encrypt(message, key, cipherMode: cipherMode);
+    // 加密后的密文前需要添加04，后端才能正常解密
+    encryptData = "04$encryptData";
+    return encryptData;
+  }
+
+  /// 国密4解密
+  static String sm4Decrypt(String cipherText, String key) {
+    return SM4.decrypt(cipherText, key: key);
+  }
+}