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Throw on truncation in the X25519 and X448 derive bits operation #29

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Throw on truncation in the X25519 and X448 derive bits operation #29

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54 changes: 12 additions & 42 deletions index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -150,6 +150,11 @@ <h4>Operations</h4>
|key|, then [= exception/throw =] an {{InvalidAccessError}}.
</p>
</li>
<li>
<p>
If |length| is not null, and not equal to 256, then [= exception/throw =] an {{OperationError}}.
</p>
</li>
<li>
<p>
Let |secret| be the result of performing the X25519 function specified in
Expand All @@ -166,27 +171,7 @@ <h4>Operations</h4>
</p>
</li>
<li>
<dl class="switch">
<dt>If |length| is null:</dt>
<dd>Return |secret|</dd>
<dt>Otherwise:</dt>
<dd>
<dl class="switch">
<dt>
If the length of |secret| in bits is less than
|length|:
</dt>
<dd>
[= exception/throw =] an
{{OperationError}}.
</dd>
<dt>Otherwise:</dt>
<dd>
Return an <a data-cite="WebCryptoAPI#octet-string-containing">octet string containing</a> the first |length| bits of |secret|.
</dd>
</dl>
</dd>
</dl>
Return |secret|.
</li>
</ol>
</dd>
Expand Down Expand Up @@ -1002,6 +987,11 @@ <h4>Operations</h4>
|key|, then [= exception/throw =] an {{InvalidAccessError}}.
</p>
</li>
<li>
<p>
If |length| is not null, and not equal to 448, then [= exception/throw =] an {{OperationError}}.
</p>
</li>
<li>
<p>
Let |secret| be the result of performing the X448 function specified in
Expand All @@ -1018,27 +1008,7 @@ <h4>Operations</h4>
</p>
</li>
<li>
<dl class="switch">
<dt>If |length| is null:</dt>
<dd>Return |secret|</dd>
<dt>Otherwise:</dt>
<dd>
<dl class="switch">
<dt>
If the length of |secret| in bits is less than
|length|:
</dt>
<dd>
[= exception/throw =] an
{{OperationError}}.
</dd>
<dt>Otherwise:</dt>
<dd>
Return an <a data-cite="WebCryptoAPI#octet-string-containing">octet string containing</a> the first |length| bits of |secret|.
</dd>
</dl>
</dd>
</dl>
Return |secret|.
</li>
</ol>
</dd>
Expand Down