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Explain why RSA_check_key() doesn't work with hard keys.

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PR: 86
This commit is contained in:
Richard Levitte 2002-07-18 19:11:06 +00:00
parent 73957bd323
commit b61739874e
1 changed files with 10 additions and 1 deletions
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11
doc/crypto/RSA_check_key.pod
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@ -28,12 +28,21 @@ RSA_check_key() returns 1 if B<rsa> is a valid RSA key, and 0 otherwise.
If the key is invalid or an error occurred, the reason code can be
obtained using L<ERR_get_error(3)|ERR_get_error(3)>.
=head1 NOTES
RSA_check_key() can only check soft keys. If given hard keys, i.e. keys
that were retreived from an ENGINE (with ENGINE_load_private_key()),
RSA_check_key() will always return 0, as if the key was invalid. The
reason is that the private components B<p>, B<q> and B<d> are normally
not available to OpenSSL for hard keys, and the checks can therefore not
be done.
=head1 SEE ALSO
L<rsa(3)|rsa(3)>, L<err(3)|err(3)>
=head1 HISTORY
RSA_check() appeared in OpenSSL 0.9.4.
RSA_check_key() appeared in OpenSSL 0.9.4.
=cut