pgp decrypt in go

main.go

package main

import (
  	gopgp "code.google.com/p/go.crypto/openpgp"
  	gopgperrors "code.google.com/p/go.crypto/openpgp/errors"
	"fmt"
	"io"
	"os"
)

// Really stupid gopgp.KeyRing implementation
type PGPKeyring struct {
	keys []gopgp.Key
}

func (keyring PGPKeyring) KeysById(id uint64) []gopgp.Key {
	return keyring.keys
}

func (keyring PGPKeyring) DecryptionKeys() []gopgp.Key {
	return keyring.keys
}

func main() {
	// load the private key
	keyFile := "pgp_privkey"
	file, err := os.Open(keyFile)
	if err != nil {
		panic(err)
	}
	defer file.Close()
	el, err := gopgp.ReadKeyRing(file)
	if err != nil {
		panic(err)
	}
	keyring := PGPKeyring{el.DecryptionKeys()}
	prompt := func(keys []gopgp.Key, symmetric bool) ([]byte, error) {
		err := keys[0].PrivateKey.Decrypt([]byte("passcode"))
		if err != nil {
			return nil, gopgperrors.ErrKeyIncorrect
		}

		return nil, nil
	}

	// decrypt a file
	encryptedFilename := "encryptedfile.pgp"
	encryptedFile, err := os.Open(encryptedFilename)
	if err != nil {
		panic(err)
	}
	defer encryptedFile.Close()
	md, err := gopgp.ReadMessage(encryptedFile, keyring, prompt, nil)
	if err != nil {
		panic(err)
	}
	io.Copy(os.Stdout, md.UnverifiedBody)
}