You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: p224.go
    path of file: ./repos/gccrs/libgo/go/crypto/elliptic/internal/fiat
    
    the code of the file until where you have to start completion: // Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Code generated by generate.go. DO NOT EDIT.

package fiat

import (
	"crypto/subtle"
	"errors"
)

// P224Element is an integer modulo 2^224 - 2^96 + 1.
//
// The zero value is a valid zero element.
type P224Element struct {
	// Values are represented internally always in the Montgomery
    
func (e *P224Element) SetBytes(v []byte) (*P224Element, error) {
	if len(v) != p224ElementLen {
		return nil, errors.New("invalid P224Element encoding")
	}
	for i := range v {
		if v[i] < p224MinusOneEncoding[i] {
			break
		}
		if v[i] > p224MinusOneEncoding[i] {
			return nil, errors.New("invalid P224Element encoding")
		}
	}
	var in [p224ElementLen]byte
	copy(in[:], v)
	p224InvertEndianness(in[:])
	var tmp p224NonMontgomeryDomainFieldElement
	p224FromBytes((*p224UntypedFieldElement)(&tmp), &in)
	p224ToMontgomery(&e.x, &tmp)
	return e, nil
}