118 lines
2.9 KiB
Go
118 lines
2.9 KiB
Go
// 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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"bytes"
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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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// kp is the internal struct for a kepypair using seed.
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type kp struct {
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seed []byte
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}
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// CreatePair will create a KeyPair based on the rand entropy and a type/prefix byte. rand can be nil.
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func CreatePair(prefix PrefixByte) (KeyPair, error) {
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var rawSeed [32]byte
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_, err := io.ReadFull(rand.Reader, rawSeed[:])
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if err != nil {
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return nil, err
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}
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seed, err := EncodeSeed(prefix, rawSeed[:])
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if err != nil {
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return nil, err
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}
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return &kp{seed}, nil
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}
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// rawSeed will return the raw, decoded 64 byte seed.
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func (pair *kp) rawSeed() ([]byte, error) {
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_, raw, err := DecodeSeed(pair.seed)
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return raw, err
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}
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// keys will return a 32 byte public key and a 64 byte private key utilizing the seed.
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func (pair *kp) keys() (ed25519.PublicKey, ed25519.PrivateKey, error) {
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raw, err := pair.rawSeed()
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if err != nil {
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return nil, nil, err
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}
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return ed25519.GenerateKey(bytes.NewReader(raw))
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}
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// Wipe will randomize the contents of the seed key
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func (pair *kp) Wipe() {
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io.ReadFull(rand.Reader, pair.seed)
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pair.seed = nil
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}
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// Seed will return the encoded seed.
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func (pair *kp) Seed() ([]byte, error) {
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return pair.seed, nil
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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 (pair *kp) PublicKey() (string, error) {
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public, raw, err := DecodeSeed(pair.seed)
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if err != nil {
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return "", err
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}
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pub, _, err := ed25519.GenerateKey(bytes.NewReader(raw))
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if err != nil {
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return "", err
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}
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pk, err := Encode(public, 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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// PrivateKey will return the encoded private key for KeyPair.
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func (pair *kp) PrivateKey() ([]byte, error) {
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_, priv, err := pair.keys()
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if err != nil {
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return nil, err
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}
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return Encode(PrefixBytePrivate, priv)
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}
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// Sign will sign the input with KeyPair's private key.
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func (pair *kp) Sign(input []byte) ([]byte, error) {
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_, priv, err := pair.keys()
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if err != nil {
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return nil, err
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}
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return ed25519.Sign(priv, input), nil
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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 (pair *kp) Verify(input []byte, sig []byte) error {
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pub, _, err := pair.keys()
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if err != nil {
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return err
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}
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if !ed25519.Verify(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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