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package sr25519
import (
"bytes"
"fmt"
"github.com/tendermint/tendermint/crypto"
"github.com/tendermint/tendermint/crypto/tmhash"
schnorrkel "github.com/ChainSafe/go-schnorrkel"
)
var _ crypto.PubKey = PubKey{}
// PubKeySize is the number of bytes in an Sr25519 public key.
const (
PubKeySize = 32
keyType = "sr25519"
)
// PubKeySr25519 implements crypto.PubKey for the Sr25519 signature scheme.
type PubKey []byte
// Address is the SHA256-20 of the raw pubkey bytes.
func (pubKey PubKey) Address() crypto.Address {
return crypto.Address(tmhash.SumTruncated(pubKey[:]))
}
// Bytes marshals the PubKey using amino encoding.
func (pubKey PubKey) Bytes() []byte {
return []byte(pubKey)
}
func (pubKey PubKey) VerifyBytes(msg []byte, sig []byte) bool {
// make sure we use the same algorithm to sign
if len(sig) != SignatureSize {
return false
}
var sig64 [SignatureSize]byte
copy(sig64[:], sig)
publicKey := &(schnorrkel.PublicKey{})
var p [PubKeySize]byte
copy(p[:], pubKey)
err := publicKey.Decode(p)
if err != nil {
return false
}
signingContext := schnorrkel.NewSigningContext([]byte{}, msg)
signature := &(schnorrkel.Signature{})
err = signature.Decode(sig64)
if err != nil {
return false
}
return publicKey.Verify(signature, signingContext)
}
func (pubKey PubKey) String() string {
return fmt.Sprintf("PubKeySr25519{%X}", []byte(pubKey))
}
// Equals - checks that two public keys are the same time
// Runs in constant time based on length of the keys.
func (pubKey PubKey) Equals(other crypto.PubKey) bool {
if otherEd, ok := other.(PubKey); ok {
return bytes.Equal(pubKey[:], otherEd[:])
}
return false
}
func (pubKey PubKey) Type() string {
return keyType
}