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amino.go
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amino.go
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package cryptoamino
import (
"bytes"
"errors"
"reflect"
"github.com/brc20-collab/brczero/libs/tendermint/crypto"
"github.com/brc20-collab/brczero/libs/tendermint/crypto/ed25519"
"github.com/brc20-collab/brczero/libs/tendermint/crypto/multisig"
"github.com/brc20-collab/brczero/libs/tendermint/crypto/secp256k1"
"github.com/brc20-collab/brczero/libs/tendermint/crypto/sr25519"
"github.com/tendermint/go-amino"
)
var cdc = amino.NewCodec()
// nameTable is used to map public key concrete types back
// to their registered amino names. This should eventually be handled
// by amino. Example usage:
// nameTable[reflect.TypeOf(ed25519.PubKeyEd25519{})] = ed25519.PubKeyAminoName
var nameTable = make(map[reflect.Type]string, 3)
func init() {
// NOTE: It's important that there be no conflicts here,
// as that would change the canonical representations,
// and therefore change the address.
// TODO: Remove above note when
// https://github.com/tendermint/go-amino/issues/9
// is resolved
RegisterAmino(cdc)
// TODO: Have amino provide a way to go from concrete struct to route directly.
// Its currently a private API
nameTable[reflect.TypeOf(ed25519.PubKeyEd25519{})] = ed25519.PubKeyAminoName
nameTable[reflect.TypeOf(sr25519.PubKeySr25519{})] = sr25519.PubKeyAminoName
nameTable[reflect.TypeOf(secp256k1.PubKeySecp256k1{})] = secp256k1.PubKeyAminoName
nameTable[reflect.TypeOf(multisig.PubKeyMultisigThreshold{})] = multisig.PubKeyMultisigThresholdAminoRoute
}
// PubkeyAminoName returns the amino route of a pubkey
// cdc is currently passed in, as eventually this will not be using
// a package level codec.
func PubkeyAminoName(cdc *amino.Codec, key crypto.PubKey) (string, bool) {
route, found := nameTable[reflect.TypeOf(key)]
return route, found
}
// RegisterAmino registers all crypto related types in the given (amino) codec.
func RegisterAmino(cdc *amino.Codec) {
// These are all written here instead of
cdc.RegisterInterface((*crypto.PubKey)(nil), nil)
cdc.RegisterConcrete(ed25519.PubKeyEd25519{},
ed25519.PubKeyAminoName, nil)
cdc.RegisterConcrete(sr25519.PubKeySr25519{},
sr25519.PubKeyAminoName, nil)
cdc.RegisterConcrete(secp256k1.PubKeySecp256k1{},
secp256k1.PubKeyAminoName, nil)
cdc.RegisterConcrete(multisig.PubKeyMultisigThreshold{},
multisig.PubKeyMultisigThresholdAminoRoute, nil)
cdc.RegisterInterface((*crypto.PrivKey)(nil), nil)
cdc.RegisterConcrete(ed25519.PrivKeyEd25519{},
ed25519.PrivKeyAminoName, nil)
cdc.RegisterConcrete(sr25519.PrivKeySr25519{},
sr25519.PrivKeyAminoName, nil)
cdc.RegisterConcrete(secp256k1.PrivKeySecp256k1{},
secp256k1.PrivKeyAminoName, nil)
}
// RegisterKeyType registers an external key type to allow decoding it from bytes
func RegisterKeyType(o interface{}, name string) {
cdc.RegisterConcrete(o, name, nil)
nameTable[reflect.TypeOf(o)] = name
}
// PrivKeyFromBytes unmarshals private key bytes and returns a PrivKey
func PrivKeyFromBytes(privKeyBytes []byte) (privKey crypto.PrivKey, err error) {
err = cdc.UnmarshalBinaryBare(privKeyBytes, &privKey)
return
}
// PubKeyFromBytes unmarshals public key bytes and returns a PubKey
func PubKeyFromBytes(pubKeyBytes []byte) (pubKey crypto.PubKey, err error) {
err = cdc.UnmarshalBinaryBare(pubKeyBytes, &pubKey)
return
}
// hard code here for performance
var typePubKeySecp256k1Prefix = []byte{0xeb, 0x5a, 0xe9, 0x87}
var typePubKeyEd25519Prefix = []byte{0x16, 0x24, 0xde, 0x64}
var typePubKeySr25519Prefix = []byte{0x0d, 0xfb, 0x10, 0x05}
const typePrefixAndSizeLen = 4 + 1
const aminoTypePrefix = 4
// unmarshalPubKeyFromAminoFast does a fast path for amino decodes.
func unmarshalPubKeyFromAminoFast(data []byte) (crypto.PubKey, error) {
if len(data) < aminoTypePrefix {
return nil, errors.New("pubkey raw data size error")
}
if data[0] == 0x00 {
return nil, errors.New("unmarshal pubkey with disamb do not implement")
}
prefix := data[0:aminoTypePrefix]
data = data[aminoTypePrefix:]
if bytes.Compare(typePubKeySecp256k1Prefix, prefix) == 0 {
sub, err := amino.DecodeByteSliceWithoutCopy(&data)
if err != nil {
return nil, err
}
if len(sub) != secp256k1.PubKeySecp256k1Size && len(data) != 0 {
return nil, errors.New("pubkey secp256k1 size error")
}
pubKey := secp256k1.PubKeySecp256k1{}
copy(pubKey[:], sub)
return pubKey, nil
} else if bytes.Compare(typePubKeyEd25519Prefix, prefix) == 0 {
sub, err := amino.DecodeByteSliceWithoutCopy(&data)
if err != nil {
return nil, err
}
if len(sub) != ed25519.PubKeyEd25519Size && len(data) != 0 {
return nil, errors.New("pubkey ed25519 size error")
}
pubKey := ed25519.PubKeyEd25519{}
copy(pubKey[:], sub)
return pubKey, nil
} else if bytes.Compare(typePubKeySr25519Prefix, prefix) == 0 {
sub, err := amino.DecodeByteSliceWithoutCopy(&data)
if err != nil {
return nil, err
}
if len(sub) != sr25519.PubKeySr25519Size && len(data) != 0 {
return nil, errors.New("pubkey sr25519 size error")
}
pubKey := sr25519.PubKeySr25519{}
copy(pubKey[:], sub)
return pubKey, nil
} else {
return nil, errors.New("unmarshal pubkey with unknown type")
}
}
// UnmarshalPubKeyFromAmino decode pubkey from amino bytes,
// bytes should start with type prefix
func UnmarshalPubKeyFromAmino(cdc *amino.Codec, data []byte) (crypto.PubKey, error) {
var pubkey crypto.PubKey
var err error
pubkey, err = unmarshalPubKeyFromAminoFast(data)
if err != nil {
var pubkeyTmp crypto.PubKey
err = cdc.UnmarshalBinaryBare(data, &pubkeyTmp)
pubkey = pubkeyTmp
}
return pubkey, err
}
func MarshalPubKeyToAmino(cdc *amino.Codec, key crypto.PubKey) (data []byte, err error) {
switch key.(type) {
case secp256k1.PubKeySecp256k1:
data = make([]byte, 0, secp256k1.PubKeySecp256k1Size+typePrefixAndSizeLen)
data = append(data, typePubKeySecp256k1Prefix...)
data = append(data, byte(secp256k1.PubKeySecp256k1Size))
keyData := key.(secp256k1.PubKeySecp256k1)
data = append(data, keyData[:]...)
return data, nil
case ed25519.PubKeyEd25519:
data = make([]byte, 0, ed25519.PubKeyEd25519Size+typePrefixAndSizeLen)
data = append(data, typePubKeyEd25519Prefix...)
data = append(data, byte(ed25519.PubKeyEd25519Size))
keyData := key.(ed25519.PubKeyEd25519)
data = append(data, keyData[:]...)
return data, nil
case sr25519.PubKeySr25519:
data = make([]byte, 0, sr25519.PubKeySr25519Size+typePrefixAndSizeLen)
data = append(data, typePubKeySr25519Prefix...)
data = append(data, byte(sr25519.PubKeySr25519Size))
keyData := key.(sr25519.PubKeySr25519)
data = append(data, keyData[:]...)
return data, nil
}
data, err = cdc.MarshalBinaryBare(key)
if err != nil {
return nil, err
}
return data, nil
}
func MarshalPubKeyAminoTo(cdc *amino.Codec, key crypto.PubKey, buf *bytes.Buffer) error {
switch keyData := key.(type) {
case secp256k1.PubKeySecp256k1:
buf.Write(typePubKeySecp256k1Prefix)
buf.WriteByte(byte(secp256k1.PubKeySecp256k1Size))
buf.Write(keyData[:])
return nil
case ed25519.PubKeyEd25519:
buf.Write(typePubKeyEd25519Prefix)
buf.WriteByte(byte(ed25519.PubKeyEd25519Size))
buf.Write(keyData[:])
return nil
case sr25519.PubKeySr25519:
buf.Write(typePubKeySr25519Prefix)
buf.WriteByte(byte(sr25519.PubKeySr25519Size))
buf.Write(keyData[:])
return nil
}
data, err := cdc.MarshalBinaryBare(key)
if err != nil {
return err
}
buf.Write(data)
return nil
}
func PubKeyAminoSize(pubKey crypto.PubKey, cdc *amino.Codec) int {
switch k := pubKey.(type) {
case secp256k1.PubKeySecp256k1:
return amino.PrefixBytesLen + k.AminoSize(cdc)
case ed25519.PubKeyEd25519:
return amino.PrefixBytesLen + k.AminoSize(cdc)
case sr25519.PubKeySr25519:
return amino.PrefixBytesLen + k.AminoSize(cdc)
}
if sizer, ok := pubKey.(amino.Sizer); ok {
var typePrefix [8]byte
tpl, err := cdc.GetTypePrefix(pubKey, typePrefix[:])
if err != nil {
return 0
}
return tpl + sizer.AminoSize(cdc)
} else {
encodedPubKey, err := cdc.MarshalBinaryBare(pubKey)
if err != nil {
return 0
}
return len(encodedPubKey)
}
}