Signature Verification Failure, can not do RSA.verifyPSS if change device #60
Description
Title:
Signature Verification Failure Issue
Description:
Background: I encountered an issue while using your library. I'm developing an application that involves data signing using fast_rsa.
Steps to Reproduce:
- Sign data Y using key X.private on Device A, generating signature Z.
- Copy the application from Device A to Device B.
- Attempt to verify signature Z as the signature of data Y using the same key X.public on Device B.
Expected Result: I expect the signature Z to be successfully verified on Device B, just like it is on Device A.
Actual Result: However, on Device B, the verification of signature Z fails.
Device and Environment Information:
- Device A: Physical device Android 9
- Device B: android-x89 emulator Android 9
- Library Version: fast_rsa: ^3.6.1
Attempted Solutions:
I have tried regenerating the key pair and reinstalling the library, but the issue persists.
Code:
Future sign(String value) async {
var signature = await RSA.signPSS(
value, Hash.SHA512, SaltLength.AUTO, pkcs12KeyPair.privateKey);
var result = signature.replaceAll("+", "-").replaceAll("/", "");
return result;
}
Future verifySign(String value, String sign) async {
sign = sign.replaceAll("-", "+").replaceAll("_", "/");
try {
await RSA.verifyPSS(
sign, value, Hash.SHA512, SaltLength.AUTO, _pkcs12KeyPair.publicKey);
} on RSAException catch (error, stackTrace) {
debugPrint(error.cause);
debugPrintStack(stackTrace: stackTrace);
return false;
}
return true;
}
** Exception **
I/flutter (13473): crypto/rsa: verification error
I/flutter (13473): #0 RSA._boolResponse
fast_rsa.dart:71
I/flutter (13473):
I/flutter (13473): #1 RSA.verifyPSS
fast_rsa.dart:374
I/flutter (13473):
Expected Result: I hope to achieve successful signature verification on Device B, similar to the behavior on Device A.
Actual Result: However, the signature verification fails on Device B.
flutter doctor -v
[√] Flutter (Channel stable, 3.10.6, on Microsoft Windows [版本 10.0.22621.2134], locale fr-FR)
• Flutter version 3.10.6 on channel stable at C:\flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision f468f3366c (6 weeks ago), 2023-07-12 15:19:05 -0700
• Engine revision cdbeda788a
• Dart version 3.0.6
• DevTools version 2.23.1
[√] Windows Version (Installed version of Windows is version 10 or higher)
[√] Android toolchain - develop for Android devices (Android SDK version 33.0.2)
• Android SDK at C:\Users\cc\AppData\Local\Android\sdk
• Platform android-33-ext5, build-tools 33.0.2
• Java binary at: C:\Program Files\Android\Android Studio\jbr\bin\java
• Java version openjdk version "17.0.6" 2023-01-17
• All Android licenses accepted.
[√] Chrome - develop for the web
• Chrome at C:\Program Files\Google\Chrome\Application\chrome.exe
[√] Visual Studio - develop for Windows (Visual Studio Community 2022 17.5.4)
• Visual Studio at C:\Program Files\Microsoft Visual Studio\2022\Community
• Visual Studio Community 2022 version 17.5.33530.505
• Windows 10 SDK version 10.0.19041.0
[√] Android Studio (version 2022.2)
• Android Studio at C:\Program Files\Android\Android Studio
• Flutter plugin can be installed from:
https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
https://plugins.jetbrains.com/plugin/6351-dart
• Java version openjdk version "17.0.6" 2023-01-17
[√] VS Code (version 1.81.1)
• VS Code at C:\Users\cc\AppData\Local\Programs\Microsoft VS Code
• Flutter extension version 3.70.0
[√] Connected device (4 available)
• Android SDK built for x86 (mobile) • emulator-5554 • android-x86 • Android 11 (API 30) (emulator)
• Windows (desktop) • windows • windows-x64 • Microsoft Windows [版本 10.0.22621.2134]
• Chrome (web) • chrome • web-javascript • Google Chrome 115.0.5790.171
• Edge (web) • edge • web-javascript • Microsoft Edge 116.0.1938.54
[√] Network resources
• All expected network resources are available.
• No issues found!