NAME    [Toc]    [Back]

       RSA_check_key - validate private RSA keys

LIBRARY    [Toc]    [Back]

       libcrypto, -lcrypto

SYNOPSIS    [Toc]    [Back]

        #include <openssl/rsa.h>

        int RSA_check_key(RSA *rsa);

DESCRIPTION    [Toc]    [Back]

       This function validates RSA keys. It checks that p and q
       are in fact prime, and that n = p*q.

       It also checks that d*e = 1 mod (p-1*q-1), and that dmp1,
       dmq1 and iqmp are set correctly or are 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 NOTES for more information.

RETURN VALUE    [Toc]    [Back]

       RSA_check_key() returns 1 if 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 ERR_get_error(3).

NOTES    [Toc]    [Back]

       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.

SEE ALSO    [Toc]    [Back]

       openssl_rsa(3), openssl_err(3)

HISTORY    [Toc]    [Back]

       RSA_check() appeared in OpenSSL 0.9.4.



2002-07-31                    0.9.6g             RSA_check_key(3)