OpenSSL::Digest.digests

static VALUE
ossl_s_digests(VALUE self)
{
    VALUE ary;

    ary = rb_ary_new();
    OBJ_NAME_do_all_sorted(OBJ_NAME_TYPE_MD_METH,
                    add_digest_name_to_ary,
                    (void*)ary);

    return ary;
}