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