diff --git a/addrconvs.go b/addrconvs.go index d61cb5c..6c51d0b 100644 --- a/addrconvs.go +++ b/addrconvs.go @@ -11,10 +11,9 @@ import ( "github.com/conformal/btcwire" ) -// ErrAddrUnknownNet describes an error where the address identifier -// byte is not recognized as belonging to neither the Bitcoin MainNet nor -// TestNet. -var ErrAddrUnknownNet = errors.New("unrecognized network identifier byte") +// ErrUnknownNet describes an error where the Bitcoin network is +// not recognized. +var ErrUnknownNet = errors.New("unrecognized bitcoin network") // ErrMalformedAddress describes an error where an address is improperly // formatted, either due to an incorrect length of the hashed pubkey or @@ -31,30 +30,40 @@ const ( TestNetAddr = 0x6f ) -// EncodeAddress takes a 20-byte raw payment address (hash160 of the -// uncompressed pubkey) and a network identifying byte and encodes the -// payment address in a human readable string. -func EncodeAddress(addrHash []byte, netID byte) (encoded string, err error) { +// EncodeAddress takes a 20-byte raw payment address (hash160 of a pubkey) +// and the Bitcoin network to create a human-readable payment address string. +func EncodeAddress(addrHash []byte, net btcwire.BitcoinNet) (encoded string, err error) { if len(addrHash) != ripemd160.Size { return "", ErrMalformedAddress } - if netID != MainNetAddr && netID != TestNetAddr { - return "", ErrAddrUnknownNet + + var netID byte + switch net { + case btcwire.MainNet: + netID = MainNetAddr + case btcwire.TestNet3: + netID = TestNetAddr + default: + return "", ErrUnknownNet } tosum := append([]byte{netID}, addrHash...) cksum := btcwire.DoubleSha256(tosum) - a := append([]byte{netID}, addrHash...) - a = append(a, cksum[:4]...) + // Address before base58 encoding is 1 byte for netID, 20 bytes for + // hash, plus 4 bytes of checksum. + a := make([]byte, 25, 25) + a[0] = netID + copy(a[1:], addrHash) + copy(a[21:], cksum[:4]) return Base58Encode(a), nil } -// DecodeAddress decodes a human readable payment address string -// returning the 20-byte decoded address, along with the network -// identifying byte. -func DecodeAddress(addr string) (addrHash []byte, netID byte, err error) { +// DecodeAddress decodes a human-readable payment address string +// returning the 20-byte decoded address, along with the Bitcoin +// network for the address. +func DecodeAddress(addr string) (addrHash []byte, net btcwire.BitcoinNet, err error) { decoded := Base58Decode(addr) // Length of decoded address must be 20 bytes + 1 byte for a network @@ -63,20 +72,26 @@ func DecodeAddress(addr string) (addrHash []byte, netID byte, err error) { return nil, 0x00, ErrMalformedAddress } - netID = decoded[0] - if netID != MainNetAddr && netID != TestNetAddr { - return nil, 0x00, ErrAddrUnknownNet + switch decoded[0] { + case MainNetAddr: + net = btcwire.MainNet + case TestNetAddr: + net = btcwire.TestNet3 + default: + return nil, 0, ErrUnknownNet } - addrHash = decoded[1:21] // Checksum is first four bytes of double SHA256 of the network byte // and addrHash. Verify this matches the final 4 bytes of the decoded // address. - tosum := append([]byte{netID}, addrHash...) + tosum := decoded[:ripemd160.Size+1] cksum := btcwire.DoubleSha256(tosum)[:4] if !bytes.Equal(cksum, decoded[len(decoded)-4:]) { - return nil, 0x00, ErrMalformedAddress + return nil, net, ErrMalformedAddress } - return addrHash, netID, nil + addrHash = make([]byte, ripemd160.Size, ripemd160.Size) + copy(addrHash, decoded[1:ripemd160.Size+1]) + + return addrHash, net, nil } diff --git a/addrconvs_test.go b/addrconvs_test.go index 68fde5f..5735259 100644 --- a/addrconvs_test.go +++ b/addrconvs_test.go @@ -7,28 +7,31 @@ package btcutil_test import ( "bytes" "github.com/conformal/btcutil" + "github.com/conformal/btcwire" "testing" ) var encodeTests = []struct { raw []byte - net byte + net btcwire.BitcoinNet res string err error }{ {[]byte{0xe3, 0x4c, 0xce, 0x70, 0xc8, 0x63, 0x73, 0x27, 0x3e, 0xfc, 0xc5, 0x4c, 0xe7, 0xd2, 0xa4, 0x91, 0xbb, 0x4a, 0x0e, 0x84}, - btcutil.MainNetAddr, "1MirQ9bwyQcGVJPwKUgapu5ouK2E2Ey4gX", nil}, + btcwire.MainNet, "1MirQ9bwyQcGVJPwKUgapu5ouK2E2Ey4gX", nil}, {[]byte{0x0e, 0xf0, 0x30, 0x10, 0x7f, 0xd2, 0x6e, 0x0b, 0x6b, 0xf4, 0x05, 0x12, 0xbc, 0xa2, 0xce, 0xb1, 0xdd, 0x80, 0xad, 0xaa}, - btcutil.MainNetAddr, "12MzCDwodF9G1e7jfwLXfR164RNtx4BRVG", nil}, + btcwire.MainNet, "12MzCDwodF9G1e7jfwLXfR164RNtx4BRVG", nil}, {[]byte{0x78, 0xb3, 0x16, 0xa0, 0x86, 0x47, 0xd5, 0xb7, 0x72, 0x83, 0xe5, 0x12, 0xd3, 0x60, 0x3f, 0x1f, 0x1c, 0x8d, 0xe6, 0x8f}, - btcutil.TestNetAddr, "mrX9vMRYLfVy1BnZbc5gZjuyaqH3ZW2ZHz", nil}, + btcwire.TestNet, "", btcutil.ErrUnknownNet}, + {[]byte{0x78, 0xb3, 0x16, 0xa0, 0x86, 0x47, 0xd5, 0xb7, 0x72, 0x83, 0xe5, 0x12, 0xd3, 0x60, 0x3f, 0x1f, 0x1c, 0x8d, 0xe6, 0x8f}, + btcwire.TestNet3, "mrX9vMRYLfVy1BnZbc5gZjuyaqH3ZW2ZHz", nil}, // Raw address not 20 bytes (padded with leading 0s) {[]byte{0x00, 0x0e, 0xf0, 0x30, 0x10, 0x7f, 0xd2, 0x6e, 0x0b, 0x6b, 0xf4, 0x05, 0x12, 0xbc, 0xa2, 0xce, 0xb1, 0xdd, 0x80, 0xad, 0xaa}, - btcutil.MainNetAddr, "12MzCDwodF9G1e7jfwLXfR164RNtx4BRVG", btcutil.ErrMalformedAddress}, + btcwire.MainNet, "12MzCDwodF9G1e7jfwLXfR164RNtx4BRVG", btcutil.ErrMalformedAddress}, - // Bad network byte - {make([]byte, 20), btcutil.MainNetAddr + 1, "", btcutil.ErrAddrUnknownNet}, + // Bad network + {make([]byte, 20), 0, "", btcutil.ErrUnknownNet}, } func TestEncodeAddresses(t *testing.T) { @@ -49,35 +52,42 @@ func TestEncodeAddresses(t *testing.T) { var decodeTests = []struct { addr string res []byte - net byte + net btcwire.BitcoinNet err error }{ {"1MirQ9bwyQcGVJPwKUgapu5ouK2E2Ey4gX", []byte{0xe3, 0x4c, 0xce, 0x70, 0xc8, 0x63, 0x73, 0x27, 0x3e, 0xfc, 0xc5, 0x4c, 0xe7, 0xd2, 0xa4, 0x91, 0xbb, 0x4a, 0x0e, 0x84}, - btcutil.MainNetAddr, nil}, + btcwire.MainNet, nil}, {"mrX9vMRYLfVy1BnZbc5gZjuyaqH3ZW2ZHz", []byte{0x78, 0xb3, 0x16, 0xa0, 0x86, 0x47, 0xd5, 0xb7, 0x72, 0x83, 0xe5, 0x12, 0xd3, 0x60, 0x3f, 0x1f, 0x1c, 0x8d, 0xe6, 0x8f}, - btcutil.TestNetAddr, nil}, + btcwire.TestNet3, nil}, // Wrong length - {"01MirQ9bwyQcGVJPwKUgapu5ouK2E2Ey4gX", nil, btcutil.MainNetAddr, btcutil.ErrMalformedAddress}, + {"01MirQ9bwyQcGVJPwKUgapu5ouK2E2Ey4gX", nil, btcwire.MainNet, btcutil.ErrMalformedAddress}, // Bad magic - {"2MirQ9bwyQcGVJPwKUgapu5ouK2E2Ey4gX", nil, btcutil.MainNetAddr, btcutil.ErrAddrUnknownNet}, + {"2MirQ9bwyQcGVJPwKUgapu5ouK2E2Ey4gX", nil, btcwire.MainNet, btcutil.ErrUnknownNet}, // Bad checksum - {"1MirQ9bwyQcGVJPwKUgapu5ouK2E2dpuqz", nil, btcutil.MainNetAddr, btcutil.ErrMalformedAddress}, + {"1MirQ9bwyQcGVJPwKUgapu5ouK2E2dpuqz", nil, btcwire.MainNet, btcutil.ErrMalformedAddress}, } func TestDecodeAddresses(t *testing.T) { for i := range decodeTests { - res, _, err := btcutil.DecodeAddress(decodeTests[i].addr) + res, net, err := btcutil.DecodeAddress(decodeTests[i].addr) if err != decodeTests[i].err { t.Error(err) } - if err == nil && !bytes.Equal(res, decodeTests[i].res) { + if err != nil { + continue + } + if !bytes.Equal(res, decodeTests[i].res) { t.Errorf("Results differ: Expected '%v', returned '%v'", decodeTests[i].res, res) } + if net != decodeTests[i].net { + t.Errorf("Networks differ: Expected '%v', returned '%v'", + decodeTests[i].net, net) + } } }