RSA_check_key man page on DigitalUNIX

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RSA_check_key(3)					      RSA_check_key(3)

       RSA_check_key - Validate private RSA keys

       #include <openssl/rsa.h>

       int RSA_check_key(
	       RSA *rsa );

       This function validates RSA keys. It checks that p and q are 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 informaiton

       This function does not work on RSA public keys that have only the modu‐
       lus and public exponent	elements  populated.   It  performs  integrity
       checks  on all the RSA key material, so the RSA key structure must con‐
       tain all the private  key data.

       The RSA_check_key() function returns 1 if rsa is a valid RSA key, and 0
       otherwise. If an error occurs while checking the key -1 is returned.

       If  the	key  is	 invalid  or an error occurred, the reason code can be
       obtained using the ERR_get_error() function.

       The RSA_check_key() function appeared in OpenSSL 0.9.4.

       Functions: rsa(3), err(3)


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