75 lines
1.5 KiB
Go
75 lines
1.5 KiB
Go
package main
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import (
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/rand"
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"crypto/sha256"
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"log"
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"golang.org/x/crypto/ripemd160"
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)
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const version = byte(0x00)
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const walletFile = "wallet.dat"
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// Wallet stores private and public keys
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type Wallet struct {
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PrivateKey ecdsa.PrivateKey
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PublicKey []byte
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}
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// NewWallet creates and returns a Wallet
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func NewWallet() *Wallet {
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private, public := newKeyPair()
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wallet := Wallet{private, public}
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return &wallet
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}
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// GetAddress returns wallet address
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func (w Wallet) GetAddress() []byte {
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pubKeyHash := HashPubKey(w.PublicKey)
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versionedPayload := append([]byte{version}, pubKeyHash...)
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checksum := checksum(versionedPayload)
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fullPayload := append(versionedPayload, checksum...)
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address := Base58Encode(fullPayload)
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return address
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}
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func newKeyPair() (ecdsa.PrivateKey, []byte) {
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curve := elliptic.P256()
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private, err := ecdsa.GenerateKey(curve, rand.Reader)
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if err != nil {
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log.Panic(err)
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}
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pubKey := append(private.PublicKey.X.Bytes(), private.PublicKey.Y.Bytes()...)
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return *private, pubKey
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}
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// HashPubKey hashes public key
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func HashPubKey(pubKey []byte) []byte {
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publicSHA256 := sha256.Sum256(pubKey)
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RIPEMD160Hasher := ripemd160.New()
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_, err := RIPEMD160Hasher.Write(publicSHA256[:])
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if err != nil {
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log.Panic(err)
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}
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publicRIPEMD160 := RIPEMD160Hasher.Sum(nil)
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return publicRIPEMD160
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}
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// Checksum generates a checksum for a public key
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func checksum(payload []byte) []byte {
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firstSHA := sha256.Sum256(payload)
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secondSHA := sha256.Sum256(firstSHA[:])
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return secondSHA[:4]
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}
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