{"record":{"id":"810b5630dfe0b17b","repo":"MuntashirAkon/AppManager","slug":"failed-to-decrypt-arrays-tostring-backupsourcefiles","errorCode":null,"errorMessage":"Failed to decrypt ${Arrays.toString(backupSourceFiles)}","messagePattern":"Failed to decrypt (.+?)","errorType":"exception","errorClass":"BackupException","httpStatus":null,"severity":"error","filePath":"app/src/main/java/io/github/muntashirakon/AppManager/backup/RestoreOp.java","lineNumber":355,"sourceCode":"            final int splitCount = mBackupMetadata.splitConfigs.length;\n            String[] allApkNames = new String[splitCount + 1];\n            Path[] allApks = new Path[splitCount + 1];\n            try {\n                Path baseApk = packageStagingDirectory.createNewFile(mBackupMetadata.apkName, null);\n                allApks[0] = baseApk;\n                allApkNames[0] = mBackupMetadata.apkName;\n                for (int i = 1; i < allApkNames.length; ++i) {\n                    allApkNames[i] = mBackupMetadata.splitConfigs[i - 1];\n                    allApks[i] = packageStagingDirectory.createNewFile(allApkNames[i], null);\n                }\n            } catch (IOException e) {\n                throw new BackupException(\"Could not create staging files\", e);\n            }\n            // Decrypt sources\n            try {\n                backupSourceFiles = mBackupItem.decrypt(backupSourceFiles);\n            } catch (IOException e) {\n                throw new BackupException(\"Failed to decrypt \" + Arrays.toString(backupSourceFiles), e);\n            }\n            // Extract apk files to the package staging directory\n            try {\n                TarUtils.extract(mBackupInfo.tarType, backupSourceFiles, packageStagingDirectory, allApkNames, null, null);\n            } catch (Throwable th) {\n                throw new BackupException(\"Failed to extract the apk file(s).\", th);\n            }\n            // A normal update will do it now\n            InstallerOptions options = InstallerOptions.getDefault();\n            options.setInstallerName(mBackupMetadata.installer);\n            options.setUserId(mUserId);\n            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {\n                options.setInstallScenario(PackageManager.INSTALL_SCENARIO_BULK);\n            }\n            AtomicReference<String> status = new AtomicReference<>();\n            PackageInstallerCompat packageInstaller = PackageInstallerCompat.getNewInstance();\n            packageInstaller.setOnInstallListener(new PackageInstallerCompat.OnInstallListener() {\n                @Override","sourceCodeStart":337,"sourceCodeEnd":373,"githubUrl":"https://github.com/MuntashirAkon/AppManager/blob/0152f468fc9463ee02dc2ca83f6fe4989a2c4ca5/app/src/main/java/io/github/muntashirakon/AppManager/backup/RestoreOp.java#L337-L373","documentation":"After staging the APK file placeholders, restoreApkFiles decrypts the backup's APK source files via mBackupItem.decrypt(). This error means decryption of one or more of those encrypted files threw an IOException — the encrypted data could not be read or transformed back to plaintext. It aborts the APK restoration phase.","triggerScenarios":"mBackupItem.decrypt(backupSourceFiles) throws IOException: encrypted APK files missing/corrupt, wrong cipher/key, truncated tar members, or I/O failure reading the encrypted files.","commonSituations":"Partial backup copies; encryption scheme changes between AppManager versions; key/password mismatch.","solutions":["Re-download or re-copy the backup; the encrypted APK archive is likely truncated or corrupted.","Verify the backup was taken with a compatible AppManager version and encryption settings.","Check that all files in the backup item exist and are readable before decrypting.","Retry the restore; transient I/O errors (e.g. on external storage) can cause spurious failures."],"exampleFix":"// before\nbackupSourceFiles = mBackupItem.decrypt(backupSourceFiles);\n// after\nfor (Path f : backupSourceFiles) {\n    if (f.getLength() <= 0) throw new BackupException(\"Encrypted file empty/corrupt: \" + f);\n}\nbackupSourceFiles = mBackupItem.decrypt(backupSourceFiles);","handlingStrategy":"try-catch","validationCode":"for (Path f : encryptedFiles) { if (!f.exists() || f.length() == 0) throw new IOException(\"Missing/empty encrypted file: \" + f); }","typeGuard":null,"tryCatchPattern":"try { files = backupItem.decrypt(files); } catch (IOException e) { throw new BackupException(\"Failed to decrypt \" + Arrays.toString(files) + \" — verify backup integrity and encryption settings\", e); }","preventionTips":["Verify backup integrity (checksums) before starting restore","Keep encryption credentials/keys consistent between backup and restore","Transfer backups with integrity-checked methods (checksum after copy)","Test decrypt on a small file before the full restore"],"tags":["android","encryption","backup-restore"],"backgroundTag":"file-read-failed","analyzedSha":"0152f468fc9463ee02dc2ca83f6fe4989a2c4ca5","analyzedAt":"2026-09-12T14:03:37.243Z","contentChangedAt":"2026-09-12T14:03:37.243Z","schemaVersion":2},"datasetVersion":"2026-09-14T16:17:12.679Z"}