Failed to dicipher data

[jcgruenhage]

I'm trying to use Pass for iOS 0.18.0 (5) on a freshly set up iPhone 16. I'm using a YubiKey 5 NFC with firmware version 5.2.7, with an ed25519 OpenPGP key on it (see https://pastebin.com/raw/kZ6d4McQ).

Trying to decipher a password fails. PIN validation seems to work, as I get a different error message when I enter the wrong PIN. Any other information I can provide to help with this?

[jcgruenhage]

Well, okay... https://github.com/mssun/passforios/wiki/Supported-or-Unsupported-Keys#unsupported-ones-1 says ed25519 is not supported, but #616 (comment) claims that it is. Which one is it now?

[jcgruenhage]

Just verified that Pass for iOS 0.19.0 (4) exhibits the same behaviour.

If I had looked through the code sooner, I could've skipped checking the new version:

passforios/pass/Services/PasswordDecryptor.swift

Lines 90 to 92 in c3e6796

	guard let deciphered = try? await smartCard.decipher(ciphertext: encryptedData) else {
	throw AppError.yubiKey(.connection(message: "Failed to dicipher data"))
	}

passforios/passKit/Extensions/YKFSmartCardInterfaceExtension.swift

Lines 60 to 64 in c3e6796

	func decipher(ciphertext: Data) async throws -> Data {
	let applicationRelatedData = try await getApplicationRelatedData()
	guard applicationRelatedData.decryptionAlgorithm == .rsa else {
	throw AppError.yubiKey(.decipher(message: "Encryption key algorithm is not supported. Supported algorithm: RSA."))
	}

There is a good error message in there, but sadly it's hidden by the more generic one.