Function to test passphrase

[Will McDonald]

Hello,
I'd like to write a little program that would simply test whether a given
passphrase is correct or not for a private key, then return true or false.
I've looked at the sources, but it wasn't immediately obvious to me what gnupg
functions to start with. Obiously there are a few steps to this (loading the
private key, testing the passphrase)...

Can someone point me to which functions I should be looking at? Also, any
tips?

Thanks,
-will

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:wq