UnimplementedError: Ecdh.p256(length: 32).newKeyPair() on on Android

[joshuajylin]

Does cryptography or cryptography_flutter support ECDH p256 on Android?

[phillippbertram]

I have the same issue.

It seems that the CryptographyFlutterPlugin.kt should support ECDH algorithms:

cryptography/cryptography_flutter/android/src/main/kotlin/dev/dint/cryptography_flutter/CryptographyFlutterPlugin.kt

Line 56 in 4ba46dc

"Ecdh.newKeyPair" -> ecNewKeyPair(call, result)

After some debugging, I found that the the isSupportedPlatform in flutter_ecdh.dart returns false if the current platform is not a Cupertino device.

  @override
  bool get isSupportedPlatform =>
      FlutterCryptography.isPluginPresent && isCupertino;

Maybe an easy fix would be to remove the && isCupertino statement? 🤷

[joaquingrech]

This bug also happens on windows build, it seems it is forced to ios and android, leaving out all other platforms although they should be supported