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<a href="https://gitlab.com/asosedkin" style="color: #1068bf;">Alexander Sosedkin</a>
<a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1603#note_1013465260" style="color: #1068bf;">commented</a>:
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<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">From the first reading, I does look like it achieves the goal of hard-blocking encryption of plaintext longer than 2^39-256 bit:</p>
<ol dir="auto" style="text-align: initial; margin: 0 0 16px; padding: 0;">
<li style="margin-top: 0; line-height: 1.6em; margin-left: 25px; padding-left: 3px;">if we hard-block, then we need the change documented</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">5.2.2 says</li>
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<blockquote dir="auto" style="font-size: inherit; color: #525252; padding-top: 0.5rem; padding-bottom: 0.5rem; padding-left: 1.5rem; box-shadow: inset 4px 0 0 0 #dbdbdb; border-top-width: 0; border-bottom-width: 0; border-right-width: 0; margin: 0.5rem 0;" align="initial">
<p style="color: inherit; line-height: 1.5; margin: 0;">The values for len(C), len (A), and len(IV) that an implementation supports for the authenticated
decryption function shall be the same as the values for len(P), len (A), and len(IV) that the
implementation supports for the authenticated encryption function.</p>
</blockquote>
<p dir="auto" style="color: #303030; margin: 0;" align="initial">which I interpret as limit(len(C)) == limit(len(P)) == 2^39-256 bit</p>
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