<?php
$res = gnupg_init();
gnupg_clearsignkeys($res);
$key = get_pub_key();// Value pasted below
$publicImp = gnupg_import($res, $key);
gnupg_addsignkey($res, $publicImp['fingerprint']);
echo gnupg_geterror($res); // Prints `get_key failed`
Ключ генерируется из https://www.igolder.com/pgp/generate-key/
-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: BCPG C# v1.6.1.0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=pvzn
-----END PGP PUBLIC KEY BLOCK-----
Информация о ключе выглядит следующим образом.
[fingerprint] => AF4A061F20FFFE141AA366FE586DCFCD529A884E
[keyid] => 586DCFCD529A884E
[timestamp] => 1573215581
[expires] => 0
[is_secret] =>
[invalid] =>
[can_encrypt] => 1
[can_sign] => 1
[disabled] =>
[expired] =>
[revoked] =>
Не удалось найти решение, любезно помогите.