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-=pod
-
-=head1 NAME
-
-RSA_check_key - validate private RSA keys
-
-=head1 SYNOPSIS
-
- #include <openssl/rsa.h>
-
- int RSA_check_key(RSA *rsa);
-
-=head1 DESCRIPTION
-
-This function validates RSA keys. It checks that B<p> and B<q> are
-in fact prime, and that B<n = p*q>.
-
-It also checks that B<d*e = 1 mod (p-1*q-1)>,
-and that B<dmp1>, B<dmq1> and B<iqmp> are set correctly or are B<NULL>.
-
-As such, this function can not be used with any arbitrary RSA key object,
-even if it is otherwise fit for regular RSA operation. See B<NOTES> for more
-information.
-
-=head1 RETURN VALUE
-
-RSA_check_key() returns 1 if B<rsa> is a valid RSA key, and 0 otherwise.
--1 is returned if an error occurs while checking the key.
-
-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
-
-This function does not work on RSA public keys that have only the modulus
-and public exponent elements populated. It performs integrity checks on all
-the RSA key material, so the RSA key structure must contain all the private
-key data too.
-
-Unlike most other RSA functions, this function does B<not> work
-transparently with any underlying ENGINE implementation because it uses the
-key data in the RSA structure directly. An ENGINE implementation can
-override the way key data is stored and handled, and can even provide
-support for HSM keys - in which case the RSA structure may contain B<no>
-key data at all! If the ENGINE in question is only being used for
-acceleration or analysis purposes, then in all likelihood the RSA key data
-is complete and untouched, but this can't be assumed in the general case.
-
-=head1 BUGS
-
-A method of verifying the RSA key using opaque RSA API functions might need
-to be considered. Right now RSA_check_key() simply uses the RSA structure
-elements directly, bypassing the RSA_METHOD table altogether (and
-completely violating encapsulation and object-orientation in the process).
-The best fix will probably be to introduce a "check_key()" handler to the
-RSA_METHOD function table so that alternative implementations can also
-provide their own verifiers.
-
-=head1 SEE ALSO
-
-L<rsa(3)|rsa(3)>, L<ERR_get_error(3)|ERR_get_error(3)>
-
-=head1 HISTORY
-
-RSA_check_key() appeared in OpenSSL 0.9.4.
-
-=cut