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package key
import (
"bytes"
"encoding/hex"
"fmt"
"io"
"os"
)
// BoxPublicKey is a public NaCl box key.
type BoxPublicKey [32]byte
// BoxPrivateKey is a private NaCl box key.
type BoxPrivateKey [32]byte
// LoadBoxKeypair reads the public and private NaCl box keys from disc,
// or generates a new keypair if it does not already exist.
// These keys can be used for NaCl box (encryption/decryption) operations.
func LoadBoxKeypair() (pub BoxPublicKey, priv BoxPrivateKey, err error) {
err = generateBoxKeypairIfNotExist()
if err != nil {
return
}
pub, err = loadBoxKey(boxPubKeyFile)
if err != nil {
return
}
priv, err = loadBoxKey(boxPrivKeyFile)
return
}
// LoadBoxPublicKey reads the public NaCl box key from disc,
// or generates a new keypair if it does not already exist.
func LoadBoxPublicKey() (BoxPublicKey, error) {
err := generateBoxKeypairIfNotExist()
if err != nil {
return BoxPublicKey{}, err
}
key, err := loadBoxKey(boxPubKeyFile)
return BoxPublicKey(key), err
}
// loadBoxKey reads a NaCl box key (public or private) from the specified file.
func loadBoxKey(filename string) ([32]byte, error) {
// Open file.
f, err := os.Open(filename)
if err != nil {
return [32]byte{}, err
}
defer f.Close()
// Read key from file.
buf, err := io.ReadAll(f)
if err != nil {
return [32]byte{}, err
}
// Decode key.
var key [32]byte
if hex.DecodedLen(len(buf)) != len(key) {
return [32]byte{}, fmt.Errorf("malformed key: expected %d bytes; got %d",
len(key), hex.DecodedLen(len(buf)))
}
if _, err := hex.Decode(key[:], buf); err != nil {
return [32]byte{}, err
}
return key, nil
}
func (bpk1 BoxPublicKey) Compare(bpk2 BoxPublicKey) int {
return bytes.Compare(bpk1[:], bpk2[:])
}
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