Character Encoding used for Passphrase for edit-key

[Harakiri]

Im unable to use a key created by gnupg which contains german umlauts with other crypto libaries (bouncycastle).

It works well with non umlaut passwords.

What character encoding does gnupg use when setting/changing the passphrase ?

I tried UTF-8 but that did not work the passphrase is not recognized by bouncycastle

Thanks
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