ifier() return NULL on failure and a non-NULL value on success: &quot;*&quot; if <i>N</i> is not NULL, the selected group id otherwise. This value should not be freed.</p>

<p>SRP_check_known_gN_param() returns the text representation of the group id (i.e. the prime bit size) or NULL if the arguments are not valid SRP group parameters. This value should not be freed.</p>

<p>SRP_get_default_gN() returns NULL if <i>id</i> is not a valid group size, or the 8192-bit group parameters if <i>id</i> is NULL.</p>

