5 RSA_check_key - validate private RSA keys
9 #include <openssl/rsa.h>
11 int RSA_check_key(RSA *rsa);
15 This function validates RSA keys. It checks that B<p> and B<q> are
16 in fact prime, and that B<n = p*q>.
18 It also checks that B<d*e = 1 mod (p-1*q-1)>,
19 and that B<dmp1>, B<dmq1> and B<iqmp> are set correctly or are B<NULL>.
21 As such, this function can not be used with any arbitrary RSA key object,
22 even if it is otherwise fit for regular RSA operation. See B<NOTES> for more
27 RSA_check_key() returns 1 if B<rsa> is a valid RSA key, and 0 otherwise.
28 -1 is returned if an error occurs while checking the key.
30 If the key is invalid or an error occurred, the reason code can be
31 obtained using L<ERR_get_error(3)|ERR_get_error(3)>.
35 This function does not work on RSA public keys that have only the modulus
36 and public exponent elements populated. It performs integrity checks on all
37 the RSA key material, so the RSA key structure must contain all the private
42 L<rsa(3)|rsa(3)>, L<err(3)|err(3)>
46 RSA_check() appeared in OpenSSL 0.9.4.