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package main
import (
"bufio"
"bytes"
"encoding/base64"
"encoding/hex"
"encoding/pem"
"fmt"
"io"
"os"
"strings"
"golang.org/x/crypto/ssh"
)
func readMasterKey() []byte {
reader := bufio.NewReader(os.Stdin)
input, err := reader.ReadString('\n')
if err != nil && err != io.EOF {
panic(err)
}
input = strings.TrimSpace(input)
if decoded, err := hex.DecodeString(input); err == nil {
return decoded
}
return []byte(input)
}
func formatSignedMessage(message string, signature []byte) string {
var out bytes.Buffer
out.WriteString("-----BEGIN SSH SIGNED MESSAGE-----\n")
out.WriteString(message)
if !strings.HasSuffix(message, "\n") {
out.WriteString("\n")
}
sigBlock := pem.EncodeToMemory(&pem.Block{Type: "SSH SIGNATURE", Bytes: signature})
out.Write(sigBlock)
return out.String()
}
func main() {
if len(os.Args) < 2 {
panic("usage: yokey <mode>")
}
mode := os.Args[1]
if mode == "gen" {
key := generateMasterKeyBytes()
fmt.Println(hex.EncodeToString(key))
return
}
if mode == "sshsig-public" {
master := readMasterKey()
signer := deriveSSHSigSigner(master)
fmt.Print(string(ssh.MarshalAuthorizedKey(signer.PublicKey())))
return
}
if mode == "sshsig-sign" {
if len(os.Args) != 4 {
panic("usage: yokey sshsig-sign <namespace> <message>")
}
namespace := os.Args[2]
message := []byte(os.Args[3])
master := readMasterKey()
signature := signSSHSig(master, namespace, message)
fmt.Print(formatSignedMessage(string(message), signature))
return
}
if mode == "sshsig-verify" {
if len(os.Args) != 5 {
panic("usage: yokey sshsig-verify <namespace> <message> <signature>")
}
namespace := os.Args[2]
message := []byte(os.Args[3])
signatureArg := strings.TrimSpace(os.Args[4])
master := readMasterKey()
signature, err := base64.StdEncoding.DecodeString(signatureArg)
if err != nil {
fmt.Println("invalid")
os.Exit(1)
}
if err := verifySSHSig(master, namespace, message, signature); err != nil {
fmt.Println("invalid")
os.Exit(1)
}
fmt.Println("ok")
return
}
master := readMasterKey()
if mode == "passwd" {
if len(os.Args) > 2 {
fmt.Println(derivePassword(master, os.Args[2]))
return
} else {
panic("must specify seed for password")
}
}
var pub string
var priv string
if mode == "ed25519" {
var privBytes []byte
if len(os.Args) > 3 {
pub, privBytes = deriveEd25519(master, os.Args[3])
} else {
pub, privBytes = deriveEd25519(master, "")
}
priv = string(privBytes)
}
if mode == "wg" {
if len(os.Args) > 3 {
pub, priv = deriveWireGuard(master, os.Args[3])
} else {
pub, priv = deriveWireGuard(master, "")
}
}
if len(os.Args) > 2 {
switch os.Args[2] {
case "public":
fmt.Print(pub)
return
case "private":
fmt.Print(priv)
return
}
} else {
panic("must specify mode for key: private or public")
}
}
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