



@deftypefun {gnutls_pk_algorithm_t} {gnutls_openpgp_crt_get_subkey_pk_algorithm} (gnutls_openpgp_crt_t @var{key}, unsigned int @var{idx}, unsigned int * @var{bits})
@var{key}: is an OpenPGP key

@var{idx}: is the subkey index

@var{bits}: if bits is non null it will hold the size of the parameters' in bits

This function will return the public key algorithm of a subkey of an OpenPGP
certificate.

If bits is non null, it should have enough size to hold the
parameters size in bits.  For RSA the bits returned is the modulus.
For DSA the bits returned are of the public exponent.

@strong{Returns:} a member of the @code{gnutls_pk_algorithm_t}  enumeration on
success, or GNUTLS_PK_UNKNOWN on error.

@strong{Since:} 2.4.0
@end deftypefun
