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208 lines
5.0 KiB
208 lines
5.0 KiB
package crypto
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import (
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"bytes"
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"crypto/sha256"
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secp256k1 "github.com/btcsuite/btcd/btcec"
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"github.com/tendermint/ed25519"
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"github.com/tendermint/ed25519/extra25519"
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. "github.com/tendermint/go-common"
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data "github.com/tendermint/go-data"
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"github.com/tendermint/go-wire"
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"golang.org/x/crypto/ripemd160"
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)
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// PubKey is part of Account and Validator.
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type PubKey interface {
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Address() []byte
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Bytes() []byte
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KeyString() string
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VerifyBytes(msg []byte, sig Signature) bool
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Equals(PubKey) bool
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}
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var pubKeyMapper data.Mapper
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// register both public key types with go-data (and thus go-wire)
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func init() {
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pubKeyMapper = data.NewMapper(PubKeyS{}).
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RegisterInterface(PubKeyEd25519{}, NameEd25519, TypeEd25519).
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RegisterInterface(PubKeySecp256k1{}, NameSecp256k1, TypeSecp256k1)
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}
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// PubKeyS add json serialization to PubKey
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type PubKeyS struct {
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PubKey
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}
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func (p PubKeyS) MarshalJSON() ([]byte, error) {
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return pubKeyMapper.ToJSON(p.PubKey)
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}
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func (p *PubKeyS) UnmarshalJSON(data []byte) (err error) {
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parsed, err := pubKeyMapper.FromJSON(data)
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if err == nil && parsed != nil {
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p.PubKey = parsed.(PubKey)
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}
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return
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}
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func (p PubKeyS) Empty() bool {
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return p.PubKey == nil
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}
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func PubKeyFromBytes(pubKeyBytes []byte) (pubKey PubKey, err error) {
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err = wire.ReadBinaryBytes(pubKeyBytes, &pubKey)
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return
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}
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//-------------------------------------
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// Implements PubKey
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type PubKeyEd25519 [32]byte
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func (pubKey PubKeyEd25519) Address() []byte {
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w, n, err := new(bytes.Buffer), new(int), new(error)
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wire.WriteBinary(pubKey[:], w, n, err)
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if *err != nil {
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PanicCrisis(*err)
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}
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// append type byte
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encodedPubkey := append([]byte{TypeEd25519}, w.Bytes()...)
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hasher := ripemd160.New()
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hasher.Write(encodedPubkey) // does not error
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return hasher.Sum(nil)
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}
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func (pubKey PubKeyEd25519) Bytes() []byte {
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return wire.BinaryBytes(struct{ PubKey }{pubKey})
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}
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func (pubKey PubKeyEd25519) VerifyBytes(msg []byte, sig_ Signature) bool {
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// unwrap if needed
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if wrap, ok := sig_.(SignatureS); ok {
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sig_ = wrap.Signature
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}
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// make sure we use the same algorithm to sign
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sig, ok := sig_.(SignatureEd25519)
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if !ok {
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return false
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}
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pubKeyBytes := [32]byte(pubKey)
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sigBytes := [64]byte(sig)
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return ed25519.Verify(&pubKeyBytes, msg, &sigBytes)
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}
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func (p PubKeyEd25519) MarshalJSON() ([]byte, error) {
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return data.Encoder.Marshal(p[:])
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}
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func (p *PubKeyEd25519) UnmarshalJSON(enc []byte) error {
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var ref []byte
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err := data.Encoder.Unmarshal(&ref, enc)
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copy(p[:], ref)
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return err
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}
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// For use with golang/crypto/nacl/box
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// If error, returns nil.
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func (pubKey PubKeyEd25519) ToCurve25519() *[32]byte {
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keyCurve25519, pubKeyBytes := new([32]byte), [32]byte(pubKey)
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ok := extra25519.PublicKeyToCurve25519(keyCurve25519, &pubKeyBytes)
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if !ok {
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return nil
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}
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return keyCurve25519
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}
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func (pubKey PubKeyEd25519) String() string {
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return Fmt("PubKeyEd25519{%X}", pubKey[:])
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}
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// Must return the full bytes in hex.
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// Used for map keying, etc.
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func (pubKey PubKeyEd25519) KeyString() string {
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return Fmt("%X", pubKey[:])
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}
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func (pubKey PubKeyEd25519) Equals(other PubKey) bool {
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if otherEd, ok := other.(PubKeyEd25519); ok {
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return bytes.Equal(pubKey[:], otherEd[:])
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} else {
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return false
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}
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}
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//-------------------------------------
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// Implements PubKey.
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// Compressed pubkey (just the x-cord),
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// prefixed with 0x02 or 0x03, depending on the y-cord.
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type PubKeySecp256k1 [33]byte
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// Implements Bitcoin style addresses: RIPEMD160(SHA256(pubkey))
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func (pubKey PubKeySecp256k1) Address() []byte {
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hasherSHA256 := sha256.New()
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hasherSHA256.Write(pubKey[:]) // does not error
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sha := hasherSHA256.Sum(nil)
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hasherRIPEMD160 := ripemd160.New()
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hasherRIPEMD160.Write(sha) // does not error
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return hasherRIPEMD160.Sum(nil)
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}
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func (pubKey PubKeySecp256k1) Bytes() []byte {
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return wire.BinaryBytes(struct{ PubKey }{pubKey})
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}
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func (pubKey PubKeySecp256k1) VerifyBytes(msg []byte, sig_ Signature) bool {
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// unwrap if needed
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if wrap, ok := sig_.(SignatureS); ok {
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sig_ = wrap.Signature
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}
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// and assert same algorithm to sign and verify
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sig, ok := sig_.(SignatureSecp256k1)
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if !ok {
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return false
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}
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pub__, err := secp256k1.ParsePubKey(pubKey[:], secp256k1.S256())
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if err != nil {
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return false
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}
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sig__, err := secp256k1.ParseDERSignature(sig[:], secp256k1.S256())
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if err != nil {
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return false
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}
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return sig__.Verify(Sha256(msg), pub__)
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}
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func (p PubKeySecp256k1) MarshalJSON() ([]byte, error) {
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return data.Encoder.Marshal(p[:])
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}
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func (p *PubKeySecp256k1) UnmarshalJSON(enc []byte) error {
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var ref []byte
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err := data.Encoder.Unmarshal(&ref, enc)
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copy(p[:], ref)
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return err
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}
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func (pubKey PubKeySecp256k1) String() string {
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return Fmt("PubKeySecp256k1{%X}", pubKey[:])
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}
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// Must return the full bytes in hex.
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// Used for map keying, etc.
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func (pubKey PubKeySecp256k1) KeyString() string {
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return Fmt("%X", pubKey[:])
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}
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func (pubKey PubKeySecp256k1) Equals(other PubKey) bool {
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if otherSecp, ok := other.(PubKeySecp256k1); ok {
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return bytes.Equal(pubKey[:], otherSecp[:])
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} else {
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return false
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}
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}
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