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90 lines
2.3 KiB
90 lines
2.3 KiB
package crypto
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import (
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"bytes"
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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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"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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VerifyBytes(msg []byte, sig Signature) bool
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}
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// Types of PubKey implementations
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const (
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PubKeyTypeEd25519 = byte(0x01)
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)
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// for wire.readReflect
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var _ = wire.RegisterInterface(
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struct{ PubKey }{},
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wire.ConcreteType{PubKeyEd25519{}, PubKeyTypeEd25519},
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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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// TODO: Slicing the array gives us length prefixing but loses the type byte.
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// Revisit if we add more pubkey types.
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// For now, we artificially append the type byte in front to give us backwards
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// compatibility for when the pubkey wasn't fixed length array
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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{1}, 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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// TODO: Consider returning a reason for failure, or logging a runtime type mismatch.
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func (pubKey PubKeyEd25519) VerifyBytes(msg []byte, sig_ Signature) bool {
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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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// 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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