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Our application has a user interface that shows you all of the
available ciphers, and lets you select and deselect individual
ciphers. (It does *not* allow for pattern matching.)<br>
<br>
We're working on supporting TLS 1.3. In OpenSSL, that introduces
new functions SSL_set_ciphersuites() and
SSL_CTX_set_ciphersuites(). We're trying to understand how that
relates to the previous functions SSL_set_cipher_list() and
SSL_CTX_set_cipher_list(). It would be *nice* to be able to treat
all cipher selection for all versions the same.<br>
<br>
Experimentally, based on the behavior of "openssl ciphers" and its
-ciphersuites, it appears that the new function accepts all cipher
names, as long as you use the IANA TLS_* form of the name. Source
inspection suggests that -ciphersuites is implemented directly atop
SSL_CTX_set_ciphersuites().<br>
<p>It *appears* that the behavior is that the explicit list of
IANA-named ciphers supplied with the "set_ciphersuites" functions
is unioned with the pattern-matched list of older ciphers supplied
through the old functions.<br>
</p>
Consider that I appear to be able to select an old cipher using the
new option (and thus the new function):<br>
<blockquote>
<pre>$ openssl ciphers -ciphersuites TLS_RSA_WITH_AES_256_CBC_SHA \!ALL
AES256-SHA
</pre>
</blockquote>
Is this an intended feature?<br>
<pre class="moz-signature" cols="72">--
Jordan Brown, Oracle</pre>
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