Holder
Authenticates the holder for one signature by a holder key: a key that needs the holder's biometrics or screen lock for each use. The key store calls it on Go's thread, which waits. BiometricPromptAuthenticator is the standard one.
Inheritors
Functions
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Returns once signature is authorized — after BiometricPrompt succeeds with it as the CryptoObject — and throws if the holder cancels.