feat: add certificate hashes to AppInfo

Author: lagodimos

android/src/main/kotlin/com/sharmadhiraj/installed_apps/Util.kt

@@ -4,10 +4,14 @@ import android.content.Context
 import android.content.pm.ApplicationInfo
 import android.content.pm.PackageInfo
 import android.content.pm.PackageManager
+import android.content.pm.PackageManager.GET_SIGNING_CERTIFICATES
+import android.os.Build
 import android.os.Build.VERSION.SDK_INT
 import android.os.Build.VERSION_CODES.P
+import android.util.Base64
 import android.util.Log
 import java.io.File
+import java.security.MessageDigest
 
 class Util {
     companion object {
@@ -38,6 +42,7 @@ class Util {
                     map["is_system_app"] = isSystemApp(packageManager, packageInfo.packageName)
                     map["is_launchable_app"] =
                         isLaunchableApp(packageManager, packageInfo.packageName)
+                    map["certificate_hashes"] = getCertificateHashes(packageManager, packageInfo.packageName)
                 }
             } else {
                 map["name"] = "Unknown"
@@ -75,5 +80,26 @@ class Util {
                 false
             }
         }
+
+        fun getCertificateHashes(packageManager: PackageManager, packageName: String): List<String> {
+            val packageInfo = packageManager.getPackageInfo(packageName, PackageManager.GET_SIGNING_CERTIFICATES)
+            val signingInfo = packageInfo.signingInfo
+            val signatures = if (signingInfo.hasMultipleSigners()) {
+                signingInfo.apkContentsSigners
+            } else {
+                signingInfo.signingCertificateHistory
+            }
+
+            val hashes = signatures.map {
+                signature -> MessageDigest
+                    .getInstance("SHA-256")
+                    .digest(signature.toByteArray())
+                    .joinToString(":") {
+                        "%02X".format(it)
+                    }
+            }
+
+            return hashes
+        }
     }
 }

lib/app_info.dart

@@ -10,6 +10,7 @@ class AppInfo {
   final int installedTimestamp;
   final bool isSystemApp;
   final bool isLaunchableApp;
+  final List<String> certificateHashes;
 
   const AppInfo({
     required this.name,
@@ -21,6 +22,7 @@ class AppInfo {
     required this.installedTimestamp,
     required this.isSystemApp,
     required this.isLaunchableApp,
+    required this.certificateHashes,
   });
 
   factory AppInfo.create(dynamic data) {
@@ -34,6 +36,7 @@ class AppInfo {
       installedTimestamp: data["installed_timestamp"] ?? 0,
       isSystemApp: data["is_system_app"] ?? false,
       isLaunchableApp: data["is_launchable_app"] ?? true,
+      certificateHashes: data["certificate_hashes"].cast<String>() ?? [],
     );
   }