// String returns the extended key as a human-readable base58-encoded string.
func (k *ExtendedKey) String() (string, error) {
if len(k.key) == 0 {
return "", fmt.Errorf("zeroed extended key")
}
var childNumBytes [4]byte
depthByte := byte(k.depth % 256)
binary.BigEndian.PutUint32(childNumBytes[:], k.childNum)
// The serialized format is:
// version (4) || depth (1) || parent fingerprint (4)) ||
// child num (4) || chain code (32) || key data (33) || checksum (4)
serializedBytes := make([]byte, 0, serializedKeyLen+4)
serializedBytes = append(serializedBytes, k.version...)
serializedBytes = append(serializedBytes, depthByte)
serializedBytes = append(serializedBytes, k.parentFP...)
serializedBytes = append(serializedBytes, childNumBytes[:]...)
serializedBytes = append(serializedBytes, k.chainCode...)
if k.isPrivate {
serializedBytes = append(serializedBytes, 0x00)
serializedBytes = append(serializedBytes, k.key...)
} else {
serializedBytes = append(serializedBytes, k.pubKeyBytes()...)
}
checkSum := chainhash.HashFuncB(serializedBytes)[:4]
serializedBytes = append(serializedBytes, checkSum...)
return base58.Encode(serializedBytes), nil
}
// String creates the Wallet Import Format string encoding of a WIF structure.
// See DecodeWIF for a detailed breakdown of the format and requirements of
// a valid WIF string.
func (w *WIF) String() string {
// Precalculate size. Maximum number of bytes before base58 encoding
// is two bytes for the network, one byte for the ECDSA type, 32 bytes
// of private key and finally four bytes of checksum.
encodeLen := 2 + 1 + 32 + 4
a := make([]byte, 0, encodeLen)
a = append(a, w.netID[:]...)
a = append(a, byte(w.ecType))
a = append(a, w.PrivKey.Serialize()...)
cksum := chainhash.HashFuncB(a)
a = append(a, cksum[:4]...)
return base58.Encode(a)
}
