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sign.go
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sign.go
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package nacl
import (
"crypto/rand"
"fmt"
"io/ioutil"
"os"
"github.com/pkg/errors"
"github.com/smallstep/cli/errs"
"github.com/smallstep/cli/utils"
"github.com/urfave/cli"
"golang.org/x/crypto/nacl/sign"
)
func signCommand() cli.Command {
return cli.Command{
Name: "sign",
Usage: "signs small messages using public-key cryptography",
UsageText: "step crypto nacl sign <subcommand> [arguments] [global-flags] [subcommand-flags]",
Description: `
**step crypto nacl sign** command group uses public-key cryptography to sign
and verify messages.
TODO
## EXAMPLES
Create a keypair for verifying amd signing messages:
'''
$ step crypto nacl sign keypair nacl.sign.pub nacl.sign.priv
'''
Sign a message using the private key:
'''
$ step crypto nacl sign sign nacl.sign.priv
Write text to sign: ********
rNrOfqsv4svlRnVPSVYe2REXodL78yEMHtNkzAGNp4MgHuVGoyayp0zx4D5rjTzYVVrD2HRP306ZILT62ohvCG1lc3NhZ2U
$ cat message.txt | step crypto nacl sign sign ~/step/keys/nacl.recipient.sign.priv
rNrOfqsv4svlRnVPSVYe2REXodL78yEMHtNkzAGNp4MgHuVGoyayp0zx4D5rjTzYVVrD2HRP306ZILT62ohvCG1lc3NhZ2U
'''
Verify the signed message using the public key:
'''
$ echo rNrOfqsv4svlRnVPSVYe2REXodL78yEMHtNkzAGNp4MgHuVGoyayp0zx4D5rjTzYVVrD2HRP306ZILT62ohvCG1lc3NhZ2U \
| step crypto nacl sign open nacl.sign.pub
message
'''`,
Subcommands: cli.Commands{
signKeypairCommand(),
signOpenCommand(),
signSignCommand(),
},
}
}
func signKeypairCommand() cli.Command {
return cli.Command{
Name: "keypair",
Action: cli.ActionFunc(signKeypairAction),
Usage: "generates a pair for use with sign and open",
UsageText: "**step crypto nacl sign keypair** <pub-file> <priv-file>",
Description: `**step crypto nacl sign keypair** generates a secret key and a corresponding
public key valid for verifying and signing messages.
For examples, see **step help crypto nacl sign**.`,
}
}
func signOpenCommand() cli.Command {
return cli.Command{
Name: "open",
Action: cli.ActionFunc(signOpenAction),
Usage: "verifies a signed message produced by sign",
UsageText: "**step crypto nacl sign open** <pub-file>",
Description: `**step crypto nacl sign open** verifies the signature of a message using the
signer's public key.
For examples, see **step help crypto nacl sign**.`,
Flags: []cli.Flag{
cli.BoolFlag{
Name: "raw",
Usage: "Indicates that input is not base64 encoded",
},
},
}
}
func signSignCommand() cli.Command {
return cli.Command{
Name: "sign",
Action: cli.ActionFunc(signSignAction),
Usage: "signs a message using Ed25519",
UsageText: "**step crypto nacl sign sign** <priv-file>",
Description: `**step crypto nacl sign keypair** signs a message m using the signer's private
key.
For examples, see **step help crypto nacl sign**.`,
Flags: []cli.Flag{
cli.BoolFlag{
Name: "raw",
Usage: "Do not base64 encode output",
},
},
}
}
func signKeypairAction(ctx *cli.Context) error {
if err := errs.NumberOfArguments(ctx, 2); err != nil {
return err
}
args := ctx.Args()
pubFile, privFile := args[0], args[1]
if pubFile == privFile {
return errs.EqualArguments(ctx, "<pub-file>", "<priv-file>")
}
pub, priv, err := sign.GenerateKey(rand.Reader)
if err != nil {
return errors.Wrap(err, "error generating key")
}
if err := utils.WriteFile(pubFile, pub[:], 0600); err != nil {
return errs.FileError(err, pubFile)
}
if err := utils.WriteFile(privFile, priv[:], 0600); err != nil {
return errs.FileError(err, privFile)
}
return nil
}
func signOpenAction(ctx *cli.Context) error {
if err := errs.NumberOfArguments(ctx, 1); err != nil {
return err
}
pubFile := ctx.Args().Get(0)
pub, err := ioutil.ReadFile(pubFile)
if err != nil {
return errs.FileError(err, pubFile)
} else if len(pub) != 32 {
return errors.New("invalid public key: key size is not 32 bytes")
}
input, err := utils.ReadInput("Write signed message to open: ")
if err != nil {
return errors.Wrap(err, "error reading input")
}
var rawInput []byte
if ctx.Bool("raw") {
rawInput = input
} else {
// DecodeLen returns the maximum length,
// Decode will return the actual length.
rawInput = make([]byte, b64Encoder.DecodedLen(len(input)))
n, err := b64Encoder.Decode(rawInput, input)
if err != nil {
return errors.Wrap(err, "error decoding base64 input")
}
rawInput = rawInput[:n]
}
var pb [32]byte
copy(pb[:], pub)
raw, ok := sign.Open(nil, rawInput, &pb)
if !ok {
return errors.New("error authenticating input")
}
os.Stdout.Write(raw)
return nil
}
func signSignAction(ctx *cli.Context) error {
if err := errs.NumberOfArguments(ctx, 1); err != nil {
return err
}
privFile := ctx.Args().Get(0)
priv, err := ioutil.ReadFile(privFile)
if err != nil {
return errs.FileError(err, privFile)
} else if len(priv) != 64 {
return errors.New("invalid private key: key size is not 64 bytes")
}
input, err := utils.ReadInput("Write text to sign: ")
if err != nil {
return errors.Wrap(err, "error reading input")
}
var pv [64]byte
copy(pv[:], priv)
raw := sign.Sign(nil, input, &pv)
if ctx.Bool("raw") {
os.Stdout.Write(raw)
} else {
fmt.Println(b64Encoder.EncodeToString(raw))
}
return nil
}