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Tested with "make".

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>
This commit is contained in:
Alex Ellis (OpenFaaS Ltd)
2019-10-06 22:30:47 +01:00
committed by Alex Ellis
parent f62bcb0736
commit d6cf72bb39
247 changed files with 51179 additions and 11409 deletions
Download Patch File Download Diff File Expand all files Collapse all files

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# Binaries for programs and plugins
*.exe
*.dll
*.so
*.dylib
build/
# Test binary, build with `go test -c`
*.test
# Output of the go coverage tool, specifically when used with LiteIDE
*.out
# Project-local glide cache, RE: https://github.com/Masterminds/glide/issues/736
.glide/

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project_name: nkeys
release:
github:
owner: nats-io
name: nkeys
name_template: '{{.Tag}}'
draft: true
builds:
- main: ./nk/main.go
ldflags: "-X main.Version={{.Tag}}_{{.Commit}}"
binary: nk
goos:
- linux
- darwin
goarch:
- amd64
dist: build
archive:
wrap_in_directory: true
name_template: '{{ .ProjectName }}-v{{ .Version }}-{{ .Os }}-{{ .Arch }}{{ if .Arm
}}v{{ .Arm }}{{ end }}'
format: zip
checksum:
name_template: '{{ .ProjectName }}-v{{ .Version }}-checksums.txt'
snapshot:
name_template: 'dev'
nfpm:
formats:
- deb
bindir: /usr/local/bin
description: NKeys utility cli program
vendor: nats-io

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language: go
sudo: false
go:
- 1.12.x
- 1.11.x
install:
- go get -t ./...
- go get github.com/mattn/goveralls
- go get -u honnef.co/go/tools/cmd/staticcheck
- go get -u github.com/client9/misspell/cmd/misspell
before_script:
- $(exit $(go fmt ./... | wc -l))
- go vet ./...
- misspell -error -locale US .
- staticcheck ./...
script:
- go test -v
- go test -v --race
- go test -v -covermode=count -coverprofile=coverage.out
- $HOME/gopath/bin/goveralls -coverprofile coverage.out -service travis-ci
#deploy:
#- provider: script
# skip_cleanup: true
# script: curl -sL http://git.io/goreleaser | bash
# on:
# tags: true
# condition: $TRAVIS_OS_NAME = linux

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# NATS NKEYS Governance
NATS NKEYS is part of the NATS project and is subject to the [NATS Governance](https://github.com/nats-io/nats-general/blob/master/GOVERNANCE.md).

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# Maintainers
Maintainership is on a per project basis.
### Core-maintainers
- Derek Collison <derek@nats.io> [@derekcollison](https://github.com/derekcollison)

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# NKEYS
[![License Apache 2](https://img.shields.io/badge/License-Apache2-blue.svg)](https://www.apache.org/licenses/LICENSE-2.0)
[![ReportCard](http://goreportcard.com/badge/nats-io/nkeys)](http://goreportcard.com/report/nats-io/nkeys)
[![Build Status](https://travis-ci.org/nats-io/nkeys.svg?branch=master)](http://travis-ci.org/nats-io/nkeys)
[![GoDoc](http://godoc.org/github.com/nats-io/nkeys?status.svg)](http://godoc.org/github.com/nats-io/nkeys)
[![Coverage Status](https://coveralls.io/repos/github/nats-io/nkeys/badge.svg?branch=master&service=github)](https://coveralls.io/github/nats-io/nkeys?branch=master)
[![FOSSA Status](https://app.fossa.io/api/projects/git%2Bgithub.com%2Fnats-io%2Fnkeys.svg?type=shield)](https://app.fossa.io/projects/git%2Bgithub.com%2Fnats-io%2Fnkeys?ref=badge_shield)
A public-key signature system based on [Ed25519](https://ed25519.cr.yp.to/) for the NATS ecosystem.
## About
The NATS ecosystem will be moving to [Ed25519](https://ed25519.cr.yp.to/) keys for identity, authentication and authorization for entities such as Accounts, Users, Servers and Clusters.
Ed25519 is fast and resistant to side channel attacks. Generation of a seed key is all that is needed to be stored and kept safe, as the seed can generate both the public and private keys.
The NATS system will utilize Ed25519 keys, meaning that NATS systems will never store or even have access to any private keys. Authentication will utilize a random challenge response mechanism.
Dealing with 32 byte and 64 byte raw keys can be challenging. NKEYS is designed to formulate keys in a much friendlier fashion and references work done in cryptocurrencies, specifically [Stellar](https://www.stellar.org/). Bitcoin and others used a form of Base58 (or Base58Check) to endode raw keys. Stellar utilized a more traditonal Base32 with a CRC16 and a version or prefix byte. NKEYS utilizes a similar format where the prefix will be 1 byte for public and private keys and will be 2 bytes for seeds. The base32 encoding of these prefixes will yield friendly human readbable prefixes, e.g. '**N**' = server, '**C**' = cluster, '**O**' = operator, '**A**' = account, and '**U**' = user. '**P**' is used for private keys. For seeds, the first encoded prefix is '**S**', and the second character will be the type for the public key, e.g. "**SU**" is a seed for a user key pair, "**SA**" is a seed for an account key pair.
## Installation
Use the `go` command:
$ go get github.com/nats-io/nkeys
## nk - Command Line Utility
Located under the nk [directory](https://github.com/nats-io/nkeys/tree/master/nk).
## Basic API Usage
```go
// Create a new User KeyPair
user, _ := nkeys.CreateUser()
// Sign some data with a full key pair user.
data := []byte("Hello World")
sig, _ := user.Sign(data)
// Verify the signature.
err = user.Verify(data, sig)
// Access the seed, the only thing that needs to be stored and kept safe.
// seed = "SUAKYRHVIOREXV7EUZTBHUHL7NUMHPMAS7QMDU3GTIUWEI5LDNOXD43IZY"
seed, _ := user.Seed()
// Access the public key which can be shared.
// publicKey = "UD466L6EBCM3YY5HEGHJANNTN4LSKTSUXTH7RILHCKEQMQHTBNLHJJXT"
publicKey, _ := user.PublicKey()
// Create a full User who can sign and verify from a private seed.
user, _ = nkeys.FromSeed(seed)
// Create a User who can only verify signatures via a public key.
user, _ = nkeys.FromPublicKey(publicKey)
// Create a User KeyPair with our own random data.
var rawSeed [32]byte
_, err := io.ReadFull(rand.Reader, rawSeed[:]) // Or some other random source.
user2, _ := nkeys.FromRawSeed(PrefixByteUser, rawSeed)
```
## License
Unless otherwise noted, the NATS source files are distributed
under the Apache Version 2.0 license found in the LICENSE file.
[![FOSSA Status](https://app.fossa.io/api/projects/git%2Bgithub.com%2Fnats-io%2Fnkeys.svg?type=large)](https://app.fossa.io/projects/git%2Bgithub.com%2Fnats-io%2Fnkeys?ref=badge_large)

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# General
- [ ] Child key derivation
- [ ] Hardware support, e.g. YubiHSM

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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 (
"errors"
)
// An implementation of crc16 according to CCITT standards for XMODEM.
// ErrInvalidChecksum indicates a failed verification.
var ErrInvalidChecksum = errors.New("nkeys: invalid checksum")
var crc16tab = [256]uint16{
0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0,
}
// crc16 returns the 2-byte crc for the data provided.
func crc16(data []byte) uint16 {
var crc uint16
for _, b := range data {
crc = ((crc << 8) & 0xffff) ^ crc16tab[((crc>>8)^uint16(b))&0x00FF]
}
return crc
}
// validate will check the calculated crc16 checksum for data against the expected.
func validate(data []byte, expected uint16) error {
if crc16(data) != expected {
return ErrInvalidChecksum
}
return nil
}

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module github.com/nats-io/nkeys
require golang.org/x/crypto v0.0.0-20190701094942-4def268fd1a4

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golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/crypto v0.0.0-20190701094942-4def268fd1a4 h1:HuIa8hRrWRSrqYzx1qI49NNxhdi2PrY7gxVSq1JjLDc=
golang.org/x/crypto v0.0.0-20190701094942-4def268fd1a4/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=

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

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// Copyright 2018-2019 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 is an Ed25519 based public-key signature system that simplifies keys and seeds
// and performs signing and verification.
package nkeys
import (
"errors"
)
// Version
const Version = "0.1.0"
// Errors
var (
ErrInvalidPrefixByte = errors.New("nkeys: invalid prefix byte")
ErrInvalidKey = errors.New("nkeys: invalid key")
ErrInvalidPublicKey = errors.New("nkeys: invalid public key")
ErrInvalidSeedLen = errors.New("nkeys: invalid seed length")
ErrInvalidSeed = errors.New("nkeys: invalid seed")
ErrInvalidEncoding = errors.New("nkeys: invalid encoded key")
ErrInvalidSignature = errors.New("nkeys: signature verification failed")
ErrCannotSign = errors.New("nkeys: can not sign, no private key available")
ErrPublicKeyOnly = errors.New("nkeys: no seed or private key available")
)
// KeyPair provides the central interface to nkeys.
type KeyPair interface {
Seed() ([]byte, error)
PublicKey() (string, error)
PrivateKey() ([]byte, error)
Sign(input []byte) ([]byte, error)
Verify(input []byte, sig []byte) error
Wipe()
}
// CreateUser will create a User typed KeyPair.
func CreateUser() (KeyPair, error) {
return CreatePair(PrefixByteUser)
}
// CreateAccount will create an Account typed KeyPair.
func CreateAccount() (KeyPair, error) {
return CreatePair(PrefixByteAccount)
}
// CreateServer will create a Server typed KeyPair.
func CreateServer() (KeyPair, error) {
return CreatePair(PrefixByteServer)
}
// CreateCluster will create a Cluster typed KeyPair.
func CreateCluster() (KeyPair, error) {
return CreatePair(PrefixByteCluster)
}
// CreateOperator will create an Operator typed KeyPair.
func CreateOperator() (KeyPair, error) {
return CreatePair(PrefixByteOperator)
}
// FromPublicKey will create a KeyPair capable of verifying signatures.
func FromPublicKey(public string) (KeyPair, error) {
raw, err := decode([]byte(public))
if err != nil {
return nil, err
}
pre := PrefixByte(raw[0])
if err := checkValidPublicPrefixByte(pre); err != nil {
return nil, ErrInvalidPublicKey
}
return &pub{pre, raw[1:]}, nil
}
// FromSeed will create a KeyPair capable of signing and verifying signatures.
func FromSeed(seed []byte) (KeyPair, error) {
_, _, err := DecodeSeed(seed)
if err != nil {
return nil, err
}
copy := append([]byte{}, seed...)
return &kp{copy}, nil
}
// Create a KeyPair from the raw 32 byte seed for a given type.
func FromRawSeed(prefix PrefixByte, rawSeed []byte) (KeyPair, error) {
seed, err := EncodeSeed(prefix, rawSeed)
if err != nil {
return nil, err
}
return &kp{seed}, nil
}

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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() (string, error) {
pk, err := Encode(p.pre, p.pub)
if err != nil {
return "", err
}
return string(pk), nil
}
// 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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// 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 (
"bytes"
"encoding/base32"
"encoding/binary"
"golang.org/x/crypto/ed25519"
)
// PrefixByte is a lead byte representing the type.
type PrefixByte byte
const (
// PrefixByteSeed is the version byte used for encoded NATS Seeds
PrefixByteSeed PrefixByte = 18 << 3 // Base32-encodes to 'S...'
// PrefixBytePrivate is the version byte used for encoded NATS Private keys
PrefixBytePrivate PrefixByte = 15 << 3 // Base32-encodes to 'P...'
// PrefixByteServer is the version byte used for encoded NATS Servers
PrefixByteServer PrefixByte = 13 << 3 // Base32-encodes to 'N...'
// PrefixByteCluster is the version byte used for encoded NATS Clusters
PrefixByteCluster PrefixByte = 2 << 3 // Base32-encodes to 'C...'
// PrefixByteOperator is the version byte used for encoded NATS Operators
PrefixByteOperator PrefixByte = 14 << 3 // Base32-encodes to 'O...'
// PrefixByteAccount is the version byte used for encoded NATS Accounts
PrefixByteAccount PrefixByte = 0 // Base32-encodes to 'A...'
// PrefixByteUser is the version byte used for encoded NATS Users
PrefixByteUser PrefixByte = 20 << 3 // Base32-encodes to 'U...'
// PrefixByteUnknown is for unknown prefixes.
PrefixByteUknown PrefixByte = 23 << 3 // Base32-encodes to 'X...'
)
// Set our encoding to not include padding '=='
var b32Enc = base32.StdEncoding.WithPadding(base32.NoPadding)
// Encode will encode a raw key or seed with the prefix and crc16 and then base32 encoded.
func Encode(prefix PrefixByte, src []byte) ([]byte, error) {
if err := checkValidPrefixByte(prefix); err != nil {
return nil, err
}
var raw bytes.Buffer
// write prefix byte
if err := raw.WriteByte(byte(prefix)); err != nil {
return nil, err
}
// write payload
if _, err := raw.Write(src); err != nil {
return nil, err
}
// Calculate and write crc16 checksum
err := binary.Write(&raw, binary.LittleEndian, crc16(raw.Bytes()))
if err != nil {
return nil, err
}
data := raw.Bytes()
buf := make([]byte, b32Enc.EncodedLen(len(data)))
b32Enc.Encode(buf, data)
return buf[:], nil
}
// EncodeSeed will encode a raw key with the prefix and then seed prefix and crc16 and then base32 encoded.
func EncodeSeed(public PrefixByte, src []byte) ([]byte, error) {
if err := checkValidPublicPrefixByte(public); err != nil {
return nil, err
}
if len(src) != ed25519.SeedSize {
return nil, ErrInvalidSeedLen
}
// In order to make this human printable for both bytes, we need to do a little
// bit manipulation to setup for base32 encoding which takes 5 bits at a time.
b1 := byte(PrefixByteSeed) | (byte(public) >> 5)
b2 := (byte(public) & 31) << 3 // 31 = 00011111
var raw bytes.Buffer
raw.WriteByte(b1)
raw.WriteByte(b2)
// write payload
if _, err := raw.Write(src); err != nil {
return nil, err
}
// Calculate and write crc16 checksum
err := binary.Write(&raw, binary.LittleEndian, crc16(raw.Bytes()))
if err != nil {
return nil, err
}
data := raw.Bytes()
buf := make([]byte, b32Enc.EncodedLen(len(data)))
b32Enc.Encode(buf, data)
return buf, nil
}
// IsValidEncoding will tell you if the encoding is a valid key.
func IsValidEncoding(src []byte) bool {
_, err := decode(src)
return err == nil
}
// decode will decode the base32 and check crc16 and the prefix for validity.
func decode(src []byte) ([]byte, error) {
raw := make([]byte, b32Enc.DecodedLen(len(src)))
n, err := b32Enc.Decode(raw, src)
if err != nil {
return nil, err
}
raw = raw[:n]
if len(raw) < 4 {
return nil, ErrInvalidEncoding
}
var crc uint16
checksum := bytes.NewReader(raw[len(raw)-2:])
if err := binary.Read(checksum, binary.LittleEndian, &crc); err != nil {
return nil, err
}
// ensure checksum is valid
if err := validate(raw[0:len(raw)-2], crc); err != nil {
return nil, err
}
return raw[:len(raw)-2], nil
}
// Decode will decode the base32 string and check crc16 and enforce the prefix is what is expected.
func Decode(expectedPrefix PrefixByte, src []byte) ([]byte, error) {
if err := checkValidPrefixByte(expectedPrefix); err != nil {
return nil, err
}
raw, err := decode(src)
if err != nil {
return nil, err
}
if prefix := PrefixByte(raw[0]); prefix != expectedPrefix {
return nil, ErrInvalidPrefixByte
}
return raw[1:], nil
}
// DecodeSeed will decode the base32 string and check crc16 and enforce the prefix is a seed
// and the subsequent type is a valid type.
func DecodeSeed(src []byte) (PrefixByte, []byte, error) {
raw, err := decode(src)
if err != nil {
return PrefixByteSeed, nil, err
}
// Need to do the reverse here to get back to internal representation.
b1 := raw[0] & 248 // 248 = 11111000
b2 := (raw[0]&7)<<5 | ((raw[1] & 248) >> 3) // 7 = 00000111
if PrefixByte(b1) != PrefixByteSeed {
return PrefixByteSeed, nil, ErrInvalidSeed
}
if checkValidPublicPrefixByte(PrefixByte(b2)) != nil {
return PrefixByteSeed, nil, ErrInvalidSeed
}
return PrefixByte(b2), raw[2:], nil
}
func Prefix(src string) PrefixByte {
b, err := decode([]byte(src))
if err != nil {
return PrefixByteUknown
}
prefix := PrefixByte(b[0])
err = checkValidPrefixByte(prefix)
if err == nil {
return prefix
}
// Might be a seed.
b1 := b[0] & 248
if PrefixByte(b1) == PrefixByteSeed {
return PrefixByteSeed
}
return PrefixByteUknown
}
// IsValidPublicKey will decode and verify that the string is a valid encoded public key.
func IsValidPublicKey(src string) bool {
b, err := decode([]byte(src))
if err != nil {
return false
}
if prefix := PrefixByte(b[0]); checkValidPublicPrefixByte(prefix) != nil {
return false
}
return true
}
// IsValidPublicUserKey will decode and verify the string is a valid encoded Public User Key.
func IsValidPublicUserKey(src string) bool {
_, err := Decode(PrefixByteUser, []byte(src))
return err == nil
}
// IsValidPublicAccountKey will decode and verify the string is a valid encoded Public Account Key.
func IsValidPublicAccountKey(src string) bool {
_, err := Decode(PrefixByteAccount, []byte(src))
return err == nil
}
// IsValidPublicServerKey will decode and verify the string is a valid encoded Public Server Key.
func IsValidPublicServerKey(src string) bool {
_, err := Decode(PrefixByteServer, []byte(src))
return err == nil
}
// IsValidPublicClusterKey will decode and verify the string is a valid encoded Public Cluster Key.
func IsValidPublicClusterKey(src string) bool {
_, err := Decode(PrefixByteCluster, []byte(src))
return err == nil
}
// IsValidPublicOperatorKey will decode and verify the string is a valid encoded Public Operator Key.
func IsValidPublicOperatorKey(src string) bool {
_, err := Decode(PrefixByteOperator, []byte(src))
return err == nil
}
// checkValidPrefixByte returns an error if the provided value
// is not one of the defined valid prefix byte constants.
func checkValidPrefixByte(prefix PrefixByte) error {
switch prefix {
case PrefixByteOperator, PrefixByteServer, PrefixByteCluster,
PrefixByteAccount, PrefixByteUser, PrefixByteSeed, PrefixBytePrivate:
return nil
}
return ErrInvalidPrefixByte
}
// checkValidPublicPrefixByte returns an error if the provided value
// is not one of the public defined valid prefix byte constants.
func checkValidPublicPrefixByte(prefix PrefixByte) error {
switch prefix {
case PrefixByteServer, PrefixByteCluster, PrefixByteOperator, PrefixByteAccount, PrefixByteUser:
return nil
}
return ErrInvalidPrefixByte
}
func (p PrefixByte) String() string {
switch p {
case PrefixByteOperator:
return "operator"
case PrefixByteServer:
return "server"
case PrefixByteCluster:
return "cluster"
case PrefixByteAccount:
return "account"
case PrefixByteUser:
return "user"
case PrefixByteSeed:
return "seed"
case PrefixBytePrivate:
return "private"
}
return "unknown"
}