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conversions.go
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conversions.go
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// Copyright 2017 Factom Foundation
// Use of this source code is governed by the MIT
// license that can be found in the LICENSE file.
package primitives
import (
"encoding/hex"
"fmt"
"strings"
"github.com/FactomProject/ed25519"
"github.com/FactomProject/btcutil/base58"
"github.com/FactomProject/go-bip32"
"github.com/FactomProject/go-bip39"
)
func MnemonicStringToPrivateKey(mnemonic string) ([]byte, error) {
mnemonic = strings.ToLower(strings.TrimSpace(mnemonic))
seed, err := bip39.NewSeedWithErrorChecking(mnemonic, "")
if err != nil {
return nil, err
}
masterKey, err := bip32.NewMasterKey(seed)
if err != nil {
return nil, err
}
child, err := masterKey.NewChildKey(bip32.FirstHardenedChild + 7)
if err != nil {
return nil, err
}
return child.Key, nil
}
func MnemonicStringToPrivateKeyString(mnemonic string) (string, error) {
key, err := MnemonicStringToPrivateKey(mnemonic)
if err != nil {
return "", err
}
return fmt.Sprintf("%x", key), nil
}
/******************************************************************************/
/********************Human-readable private keys*******************************/
/******************************************************************************/
func HumanReadableFactoidPrivateKeyToPrivateKey(human string) ([]byte, error) {
human = strings.TrimSpace(human)
base, v1, v2, err := base58.CheckDecodeWithTwoVersionBytes(human)
if err != nil {
return nil, err
}
if v1 != 0x64 || v2 != 0x78 {
return nil, fmt.Errorf("Invalid prefix")
}
return base, nil
}
func HumanReadableFactoidPrivateKeyToPrivateKeyString(human string) (string, error) {
key, err := HumanReadableFactoidPrivateKeyToPrivateKey(human)
if err != nil {
return "", err
}
return fmt.Sprintf("%x", key), nil
}
func HumanReadableECPrivateKeyToPrivateKey(human string) ([]byte, error) {
human = strings.TrimSpace(human)
base, v1, v2, err := base58.CheckDecodeWithTwoVersionBytes(human)
if err != nil {
return nil, err
}
if v1 != 0x5d || v2 != 0xb6 {
return nil, fmt.Errorf("Invalid prefix")
}
return base, nil
}
func HumanReadableECPrivateKeyToPrivateKeyString(human string) (string, error) {
key, err := HumanReadableECPrivateKeyToPrivateKey(human)
if err != nil {
return "", err
}
return fmt.Sprintf("%x", key), nil
}
func PrivateKeyStringToHumanReadableFactoidPrivateKey(priv string) (string, error) {
return PrivateKeyStringToHumanReadablePrivateKey(priv, 0x64, 0x78)
}
func PrivateKeyStringToHumanReadableECPrivateKey(priv string) (string, error) {
return PrivateKeyStringToHumanReadablePrivateKey(priv, 0x5d, 0xb6)
}
func PrivateKeyStringToHumanReadablePrivateKey(priv string, b1, b2 byte) (string, error) {
priv = strings.TrimSpace(priv)
h, err := hex.DecodeString(priv)
if err != nil {
return "", err
}
return base58.CheckEncodeWithVersionBytes(h, b1, b2), nil
}
/******************************************************************************/
/***************************To public key**************************************/
/******************************************************************************/
func PrivateKeyStringToPublicKeyString(private string) (string, error) {
pub, err := PrivateKeyStringToPublicKey(private)
if err != nil {
return "", err
}
return fmt.Sprintf("%x", pub), nil
}
func PrivateKeyStringToPublicKey(private string) ([]byte, error) {
privHex, err := hex.DecodeString(private)
if err != nil {
return nil, err
}
return PrivateKeyToPublicKey(privHex)
}
func PrivateKeyToPublicKey(private []byte) ([]byte, error) {
pub, _, err := GenerateKeyFromPrivateKey(private)
if err != nil {
return nil, err
}
return pub, nil
}
func GenerateKeyFromPrivateKey(privateKey []byte) (public []byte, private []byte, err error) {
if len(privateKey) == 64 {
privateKey = privateKey[:32]
}
if len(privateKey) != 32 {
return nil, nil, fmt.Errorf("Wrong privateKey size")
}
keypair := new([64]byte)
copy(keypair[:32], privateKey[:])
// the crypto library puts the pubkey in the lower 32 bytes and returns the same 32 bytes.
pub := ed25519.GetPublicKey(keypair)
return pub[:], keypair[:], err
}