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package main

import (
	"fmt"
	"io/ioutil"

	"dim13.org/signify/file"
	"dim13.org/signify/key"
)

func Verify(msgFile, pubFile string, quiet bool) error {
	pubKey, err := OpenPub(pubFile)
	if err != nil {
		return err
	}
	sig, body, err := OpenSig(msgFile)
	if err != nil {
		return err
	}
	if err := pubKey.Verify(body, sig); err != nil {
		return err
	}
	if !quiet {
		fmt.Println("Signature Verfied")
	}
	return nil
}

func OpenPub(fname string) (*key.Pub, error) {
	block, err := file.DecodeFile(fname)
	if err != nil {
		return nil, err
	}
	pubKey := new(key.Pub)
	if err := key.Unmarshal(block.Bytes, pubKey); err != nil {
		return nil, err
	}
	if err := pubKey.Check(); err != nil {
		return nil, err
	}
	return pubKey, nil
}

func OpenSig(fname string) (*key.Sig, []byte, error) {
	block, err := file.DecodeFile(fname + ".sig")
	if err != nil {
		return nil, nil, err
	}
	sig := new(key.Sig)
	if err := key.Unmarshal(block.Bytes, sig); err != nil {
		return nil, nil, err
	}
	if err := sig.Check(); err != nil {
		return nil, nil, err
	}
	if len(block.Message) > 0 {
		return sig, block.Message, nil
	}
	msg, err := ioutil.ReadFile(fname)
	if err != nil {
		return nil, nil, err
	}
	return sig, msg, nil
}