dsig
Version:
Digital Signature with OpenPGP
92 lines (80 loc) • 4 kB
HTML
<html>
<head>
<meta charset="UTF-8"/>
<title>Sample</title>
</head>
<body>
(see console output, please)
<script src="./dst/dsig-api.js"></script>
<script>
(async () => {
/* configuration */
const passphrase = "sample"
/* generate public/private key pair */
console.log("==== generate public/private key pair ====")
const keypair = await DSIG.keygen("Dr. Ralf S. Engelschall", "rse@engelschall.com", passphrase)
console.log(keypair.publicKey)
console.log(keypair.privateKey)
/* determine public key fingerprint */
console.log("==== determine public key fingerprint ====")
const fpr = await DSIG.fingerprint(keypair.publicKey)
console.log(fpr)
/* generate arbitrary application payload */
console.log("==== generate arbitrary application payload ====")
const bin = "Foo"
/* generate arbitrary application meta-information */
console.log("==== generate arbitrary application meta-information ====")
let inf =
"Name: Sample\n" +
"Version: 1.0.*\n" +
"Issued: 2020-01-01\n" +
"Expires: 2020-12-31\n"
console.log(inf)
/* sign arbitrary application payload and meta-information */
console.log("==== sign arbitrary application payload and meta-information ====")
let sig = await DSIG.sign(bin, keypair.privateKey, passphrase, inf)
console.log(sig)
/* verify signature */
console.log("==== verify signature ====")
let infOut = await DSIG.verify(bin, sig, keypair.publicKey, fpr)
console.log(infOut)
if (inf === infOut)
console.log("meta-information: OK")
else
console.log("meta-information: BAD")
/* generate arbitrary application meta-information (again) */
console.log("==== generate arbitrary application meta-information (again) ====")
inf =
"Name: Sample\n" +
"Version: 1.0.*\n" +
"Issued: 2020-01-01\n" +
"Expires: 2020-12-31\n"
console.log(inf)
/* (clear-text) sign arbitrary application meta-information */
console.log("==== (clear-text) sign arbitrary application meta-information ====")
sig = await DSIG.sign(null, keypair.privateKey, passphrase, inf)
console.log(sig)
/* verify signature */
console.log("==== verify signature ====")
infOut = await DSIG.verify(null, sig, keypair.publicKey, fpr)
console.log(infOut)
if (inf === infOut)
console.log("meta-information: OK")
else
console.log("meta-information: BAD")
/* manipulate application license */
console.log("==== manipulate application license ====")
const sigBad = sig.replace(/Expires: 2020-12-31/, "Expires: 2021-12-31")
console.log(sigBad)
/* verify signature again (now has to fail) */
console.log("==== verify signature again (now has to fail) ====")
let x = await DSIG.verify(null, sigBad, keypair.publicKey, fpr).catch((err) => "OK")
if (x === "OK")
console.log("expected signature check failure: OK")
else
console.log("expected signature check failure: BAD")
})()
</script>
</body>
</html>