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// Copyright 2018 The NATS Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package nkeys
import (
"crypto/rand"
"io"
"golang.org/x/crypto/ed25519"
)
// A KeyPair from a public key capable of verifying only.
type pub struct {
pre PrefixByte
pub ed25519.PublicKey
}
// PublicKey will return the encoded public key associated with the KeyPair.
// All KeyPairs have a public key.
func (p *pub) PublicKey() ([]byte, error) {
return Encode(p.pre, p.pub)
}
// Seed will return an error since this is not available for public key only KeyPairs.
func (p *pub) Seed() ([]byte, error) {
return nil, ErrPublicKeyOnly
}
// PrivateKey will return an error since this is not available for public key only KeyPairs.
func (p *pub) PrivateKey() ([]byte, error) {
return nil, ErrPublicKeyOnly
}
// Sign will return an error since this is not available for public key only KeyPairs.
func (p *pub) Sign(input []byte) ([]byte, error) {
return nil, ErrCannotSign
}
// Verify will verify the input against a signature utilizing the public key.
func (p *pub) Verify(input []byte, sig []byte) error {
if !ed25519.Verify(p.pub, input, sig) {
return ErrInvalidSignature
}
return nil
}
// Wipe will randomize the public key and erase the pre byte.
func (p *pub) Wipe() {
p.pre = '0'
io.ReadFull(rand.Reader, p.pub)
}
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