增加RSA加密解密方法,增加国康RAS公钥配置信息

lib/funcs.dart

@@ -26,6 +26,9 @@ import 'package:network_info_plus/network_info_plus.dart';
 import 'package:package_info_plus/package_info_plus.dart';
 import 'package:path_provider/path_provider.dart';
 import 'package:permission_handler/permission_handler.dart';
+import 'package:pointycastle/asymmetric/pkcs1.dart';
+import 'package:pointycastle/asymmetric/rsa.dart';
+import 'package:pointycastle/pointycastle.dart';
 
 import 'global.dart';
 
@@ -532,6 +535,94 @@ String aesDecrypt(String str) {
   return _encrypter.decrypt(encrptyed, iv: _iv);
 }
 
+///合并字节数组
+Uint8List concatenateBytes(List<Uint8List> byteList) {
+  int totalLength = byteList.fold(0, (sum, bytes) => sum + bytes.length);
+  Uint8List result = Uint8List(totalLength);
+  int offset = 0;
+
+  for (var bytes in byteList) {
+    result.setRange(offset, offset + bytes.length, bytes);
+    offset += bytes.length;
+  }
+
+  return result;
+}
+
+///RSA加密,返回BASE64字符串,仅支持PKCS1编码
+///
+/// [keyBitLength] 密钥长度,应为512,1024,2048,4096中的一个,默认512
+String rsaEncrypt(String pubKey, String content, {int keyBitLength = 512}) {
+  try {
+    final cipher = PKCS1Encoding(RSAEngine())
+      ..init(
+          true,
+          PublicKeyParameter<RSAPublicKey>(
+              encrpyt.RSAKeyParser().parse(pubKey) as RSAPublicKey));
+
+    final utf8Bytes = Uint8List.fromList(utf8.encode(content));
+    final inputLen = utf8Bytes.length;
+    int offLen = 0;
+    int i = 0;
+    List<Uint8List> bops = [];
+
+    int size = (keyBitLength / 8 - 11).toInt();
+    while (inputLen - offLen > 0) {
+      final chunkSize = (inputLen - offLen > size) ? size : inputLen - offLen;
+      final cache = cipher.process(
+          Uint8List.sublistView(utf8Bytes, offLen, offLen + chunkSize));
+      bops.add(cache);
+      i++;
+      offLen = size * i;
+    }
+
+    final encryptedData = concatenateBytes(bops);
+    final base64Encoded = base64Encode(encryptedData);
+
+    return base64Encoded;
+  } catch (e) {
+    loge("RSA加密异常", error: e);
+    return "";
+  }
+}
+
+///RSA解密,输入BASE64,仅支持PKCS1编码
+///
+/// [keyBitLength] 密钥长度,应为512,1024,2048,4096中的一个,默认512
+String rsaDecrypt(String priKey, String content, {int keyBitLength = 512}) {
+  try {
+    final cipher = PKCS1Encoding(RSAEngine());
+    cipher.init(
+        false,
+        PrivateKeyParameter<RSAPrivateKey>(
+            encrpyt.RSAKeyParser().parse(priKey) as RSAPrivateKey));
+
+    final encryptedBytes = base64Decode(content);
+    final inputLen = encryptedBytes.length;
+    int offLen = 0;
+    int i = 0;
+
+    List<Uint8List> byteList = [];
+
+    int size = keyBitLength ~/ 8;
+    while (inputLen - offLen > 0) {
+      final int chunkSize =
+          (inputLen - offLen > size) ? size : inputLen - offLen;
+      final cache = cipher.process(
+          Uint8List.sublistView(encryptedBytes, offLen, offLen + chunkSize));
+      byteList.add(cache);
+      i++;
+      offLen = size * i;
+    }
+
+    final byteArray = concatenateBytes(byteList);
+    return utf8.decode(byteArray);
+  } catch (e) {
+    loge("RSA解密异常", error: e);
+    return '';
+  }
+}
+
 ///检查新版本
 ///
 /// 返回true表示有新版本,false没有新版本

lib/global.dart

@@ -66,3 +66,14 @@ final MethodChannel videoChannel = const MethodChannel(_videoChannelName);
 
 ///文件channel
 final MethodChannel fileChannel = const MethodChannel(_fileChannelName);
+
+///国康RSA加密公钥
+final String gkRsaPublicKey = """
+-----BEGIN PUBLIC KEY-----
+MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBALltnyc4QcGMQ7/ZT+xmV6x/OXdJ2k5ftatsES9XlScM
+fPgs/mANKCixDwNFOIAFvTnKUvGgxVhBXpFL8Ma/J0cCAwEAAQ==
+-----END PUBLIC KEY-----
+    """;
+
+///国康RSA加密密钥长度
+final int gkRsaKeyBitLength = 512;

pubspec.lock

@@ -955,7 +955,7 @@ packages:
     source: hosted
     version: "2.1.8"
   pointycastle:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: pointycastle
       sha256: "4be0097fcf3fd3e8449e53730c631200ebc7b88016acecab2b0da2f0149222fe"

pubspec.yaml

@@ -92,6 +92,7 @@ dependencies:
   image: ^4.2.0
 
   encrypt: ^5.0.3
+  pointycastle: ^3.9.1
 
   retrofit: ^4.4.1
   json_annotation: ^4.9.0