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<div class="moz-cite-prefix">On 8/16/2016 9:24 PM, Valerie Peng
wrote:<br>
</div>
<blockquote
cite="mid:f2065a91-b1bd-f55b-7e1f-055752fcdfe9@oracle.com"
type="cite">
<br>
Anyone has time to review a straightforward fix? The current
PKCS11 code assume that if public exponent is available for RSA
Private Key, then it's a RSA CRT key. However, not all vendor
implementation works this way. Changing to a tighter check and did
minor code-refactoring to avoid re-retrieving the attribute
values.
<br>
<br>
Bug: <a class="moz-txt-link-freetext" href="https://bugs.openjdk.java.net/browse/JDK-8078661">https://bugs.openjdk.java.net/browse/JDK-8078661</a>
<br>
Webrev: <a class="moz-txt-link-freetext" href="http://cr.openjdk.java.net/~valeriep/8078661/webrev.00/">http://cr.openjdk.java.net/~valeriep/8078661/webrev.00/</a>
<br>
<br>
Thanks,
<br>
Valerie
<br>
</blockquote>
<p>Given that there's a change to PKCS11 for 2.40 that says that all
RSA private key objects MUST also store CKA_PUBLIC_EXPONENT, some
change needed to be made.</p>
<p>Sorry - I don't think this fix will work. Or if its working on
your version of PKCS11, your version of PKCS11 is doing it wrong.
The problem is that if you specify attributes that don't exist on
the object, the underlying PKCS11 library is supposed to return
CKR_ATTRIBUTE_TYPE_INVALID. And that should trigger a thrown
exception before you ever get anything copied to your attributes.</p>
<p>1) Get modulus and private exponent first. That gives you the
stuff for a generic RSA private key - and if it fails, there's no
reason to continue.</p>
<p>2) Then get the rest of the stuff. If that fails, then you
already have the stuff you need for a normal private key.<br>
</p>
<p> <br>
</p>
<p>
<blockquote type="cite">
<pre> boolean crtKey;
try {
session.token.p11.C_GetAttributeValue
(session.id(), keyID, attrs2);
<span class="removed">- crtKey = (attrs2[0].pValue instanceof byte[]);</span>
<span class="new">+ crtKey = ((attrs2[1].pValue instanceof byte[]) &&</span>
<span class="new">+ (attrs2[3].pValue instanceof byte[]) &&</span>
<span class="new">+ (attrs2[4].pValue instanceof byte[]) &&</span>
<span class="new">+ (attrs2[5].pValue instanceof byte[]) &&</span>
<span class="new">+ (attrs2[6].pValue instanceof byte[]) &&</span>
<span class="new">+ (attrs2[7].pValue instanceof byte[])) ;</span>
} catch (PKCS11Exception e) {
// ignore, assume not available
crtKey = false;
}</pre>
</blockquote>
</p>
<p>// Change attrs2 so it only has the additional CRT attributes
(e.g. delete CKA_MODULUS, CKA_PRIVATE_EXPONENT from the list<br>
</p>
<p>Replace the above with <br>
</p>
<p>CK_ATTRIBUTE[] attrs3 = new CK_ATTRIBUTE[] {<br>
new CK_ATTRIBUTE(CKA_MODULUS),<br>
new CK_ATTRIBUTE(CKA_PRIVATE_EXPONENT)<br>
};<br>
// no try block needed here - we want to throw the error if it
occurs<br>
session.token.p11.C_GetAttributeValue (session.id(), keyID,
attrs3);</p>
<p>// So far so good - we have the base attributes, let's see if we
can get the additional attributes;</p>
<p>try { <br>
session.token.p11.C_GetAttributeValue(session.id(),keyID,
attrs2);<br>
} catch (PKCS11Exception e) {<br>
// we really should check the return value for one of the
non-fatal values, but let's just assume its not a CRT key<br>
return new P11RSAPrivateNonCRTKey (session, keyID, algorithm,
keyLength, attrs2, attrs3);<br>
}</p>
<p>// if we fall through then its a CRT key<br>
// -- we should check for byte[] ness of each of the components,
and throw an error if they arent - but which error?</p>
<p>return new P11RSAPrivateKey (session, keyID, algorithm,
keyLength, attrs2, attrs3);<br>
</p>
<p>// there are cleanups necessary in other places. I'd suggest
rather than depending on the ordering of attributes, you do
assignment by CKA_ values just so someone coming later doesn't
mess things up by mistake. Also, a hell of a lot more readable.<br>
</p>
<p>static CK_ATTRIBUTE getAttribute (CK_ATTRIBUTE[] attrs, long
attrType) {<br>
for (CK_ATTRIBUTE a : attrs) {<br>
if (a.type == attrType)<br>
return a;<br>
}<br>
return null; // or throw something?<br>
}<br>
</p>
<p><br>
coeff = getAtttribute(attrs,CKA_COEFFICIENT).getBigInteger();<br>
</p>
<br>
The other possibility is to change the C code for
C_GetAttributeValues so it doesn't error out for the non-fatal error
codes and instead returns a null value attribute when the attribute
is missing.<br>
<br>
Mike<br>
<br>
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