<p></p>
<p>I would like to propose two changes for a halfway sane implementation on the CGImap side:</p>
<ul>
<li>Drop the support for PEPPER, as long as libargon2 doesn't provide a public API for it (see <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="833924445" data-permission-text="Title is private" data-url="https://github.com/P-H-C/phc-winner-argon2/issues/314" data-hovercard-type="issue" data-hovercard-url="/P-H-C/phc-winner-argon2/issues/314/hovercard" href="https://github.com/P-H-C/phc-winner-argon2/issues/314">P-H-C/phc-winner-argon2#314</a>).<br>
The ruby gem does a lot of magic behind the scenes and re-implements parts of the argon2 code, or directly calls into non-public parts of the code. This is not a feasible approach for CGImap.</li>
<li>Use exactly one of the 3 possible algorithms (i, d, or id), to avoid parsing of argon2 hash values on CGImap side.<br>
Again, the issue is there's no official API to parse argon2 hash values, and I want to avoid any custom code to do so.</li>
</ul>

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