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