Returns the length of the hash
value of the digest.
This method should be overridden by each implementation subclass. If not,
digest_obj.digest().length() is returned.
static VALUE
rb_digest_instance_digest_length(VALUE self)
{
/* subclasses really should redefine this method */
VALUE digest = rb_digest_instance_digest(0, 0, self);
/* never blindly assume that #digest() returns a string */
StringValue(digest);
return INT2NUM(RSTRING_LEN(digest));
}
