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zelcrypto.go
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zelcrypto.go
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// Standalone library to generate Zelcash addresses
package zelcrypto
import (
"encoding/hex"
"fmt"
"strings"
"github.com/TheTrunk/mneumonic"
"github.com/TheTrunk/zelgen/base58"
"github.com/btcsuite/btcd/chaincfg"
"github.com/btcsuite/btcutil"
"github.com/btcsuite/btcutil/hdkeychain"
"github.com/btcsuite/golangcrypto/ripemd160"
)
type ZelWallet struct {
Passphrase string `json:"passphrase"`
HexSeed string `json:"hexSeed"`
Addresses []ZelAddress `json:"addresses"`
RequestId string `json:"requestId"`
}
type ZelAddress struct {
Value string `json:"value"`
PublicKey string `json:"publicKey"`
PrivateKey string `json:"privateKey"`
}
func getExtendedKeyFromPassphrase(mainnet bool, passphrase string) (*hdkeychain.ExtendedKey, error) {
var networkCfg chaincfg.Params
// Switch depending on mainnet or testnet
if mainnet == true {
networkCfg = chaincfg.MainNetParams
} else {
networkCfg = chaincfg.TestNet3Params
}
m := mneumonic.FromWords(strings.Split(passphrase, " "))
hexSeed := m.ToHex()
hexValue, err := hex.DecodeString(hexSeed)
if err != nil {
return nil, err
}
masterKey, err := hdkeychain.NewMaster(hexValue, &networkCfg)
if err != nil {
return nil, err
}
// get m/0'/0/0
// Hardened key for account 0. ie 0'
acct0, err := masterKey.Child(hdkeychain.HardenedKeyStart + 0)
if err != nil {
return nil, err
}
// External account for 0'
extAcct0, err := acct0.Child(0)
if err != nil {
return nil, err
}
return extAcct0, nil
}
func getAddressFromPassphrase(mainnet bool, passphrase string, position uint32) (ZelAddress, error) {
var returnValue ZelAddress
var networkId NetworkId
var networkCfg chaincfg.Params
// Switch depending on mainnet or testnet
if mainnet == true {
networkId = MainnnetId
networkCfg = chaincfg.MainNetParams
} else {
networkId = TestnetId
networkCfg = chaincfg.TestNet3Params
}
extendedKey, err := getExtendedKeyFromPassphrase(mainnet, passphrase)
if err != nil {
return returnValue, err
}
key, err := extendedKey.Child(uint32(position))
if err != nil {
return returnValue, err
}
// Serialize to compressed key bytes and pkhash
pk, err := key.ECPubKey()
if err != nil {
return returnValue, err
}
pkSerialized := pk.SerializeCompressed()
pkHash := btcutil.Hash160(pkSerialized)
encodedAddress := base58.CheckEncode(pkHash[:ripemd160.Size], networkId)
// Get the pubkey and serialise the compressed public key
privKey, err := key.ECPrivKey()
if err != nil {
return returnValue, err
}
returnValue.Value = fmt.Sprintf("%s", encodedAddress)
wif, err := btcutil.NewWIF(privKey, &networkCfg, true)
if err != nil {
return returnValue, err
}
returnValue.PrivateKey = wif.String()
returnValue.PublicKey = hex.EncodeToString(privKey.PubKey().SerializeCompressed())
return returnValue, nil
}
func CreateWallet(mainnet bool, numberOfAddressesToGenerate int) (ZelWallet, error) {
var wallet ZelWallet
var numAddresses int
var networkId NetworkId
var networkCfg chaincfg.Params
// Switch depending on mainnet or testnet
if mainnet == true {
networkId = MainnnetId
networkCfg = chaincfg.MainNetParams
} else {
networkId = TestnetId
networkCfg = chaincfg.TestNet3Params
}
if numberOfAddressesToGenerate <= 0 {
numAddresses = 20
} else if numberOfAddressesToGenerate > 100 {
numAddresses = 100
} else {
numAddresses = numberOfAddressesToGenerate
}
m := mneumonic.GenerateRandom(128)
wallet.Passphrase = strings.Join(m.ToWords(), " ")
wallet.HexSeed = m.ToHex()
extendedKey, err := getExtendedKeyFromPassphrase(mainnet, wallet.Passphrase)
if err != nil {
return wallet, err
}
// Derive extended key (repeat this from 0 to number of addresses-1)
for i := 0; i <= numAddresses-1; i++ {
var address ZelAddress
key, err := extendedKey.Child(uint32(i))
if err != nil {
return wallet, err
}
// Serialize to compressed key bytes and pkhash
pk, err := key.ECPubKey()
if err != nil {
return wallet, err
}
pkSerialized := pk.SerializeCompressed()
pkHash := btcutil.Hash160(pkSerialized)
encodedAddress := base58.CheckEncode(pkHash[:ripemd160.Size], networkId)
// Get the pubkey and serialise the compressed public key
privKey, err := key.ECPrivKey()
if err != nil {
return wallet, err
}
address.Value = fmt.Sprintf("%s", encodedAddress)
wif, err := btcutil.NewWIF(privKey, &networkCfg, true)
if err != nil {
return wallet, err
}
address.PrivateKey = wif.String()
address.PublicKey = hex.EncodeToString(privKey.PubKey().SerializeCompressed())
wallet.Addresses = append(wallet.Addresses, address)
}
return wallet, nil
}
func GetWalletFromPassphrase(mainnet bool, passphrase string, position uint32) (ZelWallet, error) {
var result ZelWallet
var address ZelAddress
address, err := getAddressFromPassphrase(mainnet, passphrase, position)
if err != nil {
return result, err
}
result.Passphrase = passphrase
result.Addresses = append(result.Addresses, address)
return result, nil
}