RSA_check_key(3)

     RSA_check_key(3)       0.9.6h (2002-09-25)       RSA_check_key(3)

     NAME
          RSA_check_key - validate private RSA keys

     SYNOPSIS
           #include <openssl/rsa.h>

           int RSA_check_key(RSA *rsa);

     DESCRIPTION
          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
          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
          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
          rsa(3), ERR_get_error(3)

     HISTORY
          RSA_check() appeared in OpenSSL 0.9.4.

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