summaryrefslogtreecommitdiff
path: root/regress/unittests/sshsig/webauthn.html
blob: 953041e61ecbe95723d13b1ace7be1879dcf8d7b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>webauthn test</title>
</head>
<body onload="init()">
<h1>webauthn test</h1>
<p>
This is a demo/test page for generating FIDO keys and signatures in SSH
formats. The page initially displays a form to generate a FIDO key and
convert it to a SSH public key.
</p>
<p>
Once a key has been generated, an additional form will be displayed to
allow signing of data using the just-generated key. The data may be signed
as either a raw SSH signature or wrapped in a sshsig message (the latter is
easier to test using command-line tools.
</p>
<p>
Lots of debugging is printed along the way.
</p>
<h2>Enroll</h2>
<span id="error" style="color: #800; font-weight: bold; font-size: 150%;"></span>
<form id="enrollform">
<table>
<tr>
<td><b>Username:</b></td>
<td><input id="username" type="text" size="20" name="user" value="test" /></td>
</tr>
<tr><td></td><td><input id="assertsubmit" type="submit" value="submit" /></td></tr>
</table>
</form>
<span id="enrollresult" style="visibility: hidden;">
<h2>clientData</h2>
<pre id="enrollresultjson" style="color: #008; font-family: monospace;"></pre>
<h2>attestationObject raw</h2>
<pre id="enrollresultraw" style="color: #008; font-family: monospace;"></pre>
<h2>attestationObject</h2>
<pre id="enrollresultattestobj" style="color: #008; font-family: monospace;"></pre>
<h2>authData raw</h2>
<pre id="enrollresultauthdataraw" style="color: #008; font-family: monospace;"></pre>
<h2>authData</h2>
<pre id="enrollresultauthdata" style="color: #008; font-family: monospace;"></pre>
<h2>SSH pubkey blob</h2>
<pre id="enrollresultpkblob" style="color: #008; font-family: monospace;"></pre>
<h2>SSH pubkey string</h2>
<pre id="enrollresultpk" style="color: #008; font-family: monospace;"></pre>
</span>
<span id="assertsection" style="visibility: hidden;">
<h2>Assert</h2>
<form id="assertform">
<span id="asserterror" style="color: #800; font-weight: bold;"></span>
<table>
<tr>
<td><b>Data to sign:</b></td>
<td><input id="message" type="text" size="20" name="message" value="test" /></td>
</tr>
<tr>
<td><input id="message_sshsig" type="checkbox" checked /> use sshsig format</td>
</tr>
<tr>
<td><b>Signature namespace:</b></td>
<td><input id="message_namespace" type="text" size="20" name="namespace" value="test" /></td>
</tr>
<tr><td></td><td><input type="submit" value="submit" /></td></tr>
</table>
</form>
</span>
<span id="assertresult" style="visibility: hidden;">
<h2>clientData</h2>
<pre id="assertresultjson" style="color: #008; font-family: monospace;"></pre>
<h2>signature raw</h2>
<pre id="assertresultsigraw" style="color: #008; font-family: monospace;"></pre>
<h2>authenticatorData raw</h2>
<pre id="assertresultauthdataraw" style="color: #008; font-family: monospace;"></pre>
<h2>authenticatorData</h2>
<pre id="assertresultauthdata" style="color: #008; font-family: monospace;"></pre>
<h2>signature in SSH format</h2>
<pre id="assertresultsshsigraw" style="color: #008; font-family: monospace;"></pre>
<h2>signature in SSH format (base64 encoded)</h2>
<pre id="assertresultsshsigb64" style="color: #008; font-family: monospace;"></pre>
</span>
</body>
<script>
// ------------------------------------------------------------------
// a crappy CBOR decoder - 20200401 djm@openbsd.org

var CBORDecode = function(buffer) {
	this.buf = buffer
	this.v = new DataView(buffer)
	this.offset = 0
}

CBORDecode.prototype.empty = function() {
	return this.offset >= this.buf.byteLength
}

CBORDecode.prototype.getU8 = function() {
	let r = this.v.getUint8(this.offset)
	this.offset += 1
	return r
}

CBORDecode.prototype.getU16 = function() {
	let r = this.v.getUint16(this.offset)
	this.offset += 2
	return r
}

CBORDecode.prototype.getU32 = function() {
	let r = this.v.getUint32(this.offset)
	this.offset += 4
	return r
}

CBORDecode.prototype.getU64 = function() {
	let r = this.v.getUint64(this.offset)
	this.offset += 8
	return r
}

CBORDecode.prototype.getCBORTypeLen = function() {
	let tl, t, l
	tl = this.getU8()
	t = (tl & 0xe0) >> 5
	l = tl & 0x1f
	return [t, this.decodeInteger(l)]
}

CBORDecode.prototype.decodeInteger = function(len) {
	switch (len) {
	case 0x18: return this.getU8()
	case 0x19: return this.getU16()
	case 0x20: return this.getU32()
	case 0x21: return this.getU64()
	default:
		if (len <= 23) {
			return len
		}
		throw new Error("Unsupported int type 0x" + len.toString(16))
	}
}

CBORDecode.prototype.decodeNegint = function(len) {
	let r = -(this.decodeInteger(len) + 1)
	return r
}

CBORDecode.prototype.decodeByteString = function(len) {
	let r = this.buf.slice(this.offset, this.offset + len)
	this.offset += len
	return r
}

CBORDecode.prototype.decodeTextString = function(len) {
	let u8dec = new TextDecoder('utf-8')
	r = u8dec.decode(this.decodeByteString(len))
	return r
}

CBORDecode.prototype.decodeArray = function(len, level) {
	let r = []
	for (let i = 0; i < len; i++) {
		let v = this.decodeInternal(level)
		r.push(v)
		// console.log("decodeArray level " + level.toString() + " index " + i.toString() + " value " + JSON.stringify(v))
	}
	return r
}

CBORDecode.prototype.decodeMap = function(len, level) {
	let r = {}
	for (let i = 0; i < len; i++) {
		let k = this.decodeInternal(level)
		let v = this.decodeInternal(level)
		r[k] = v
		// console.log("decodeMap level " + level.toString() + " key " + k.toString() + " value " + JSON.stringify(v))
		// XXX check string keys, duplicates
	}
	return r
}

CBORDecode.prototype.decodePrimitive = function(t) {
	switch (t) {
	case 20: return false
	case 21: return true
	case 22: return null
	case 23: return undefined
	default:
		throw new Error("Unsupported primitive 0x" + t.toString(2))
	}
}

CBORDecode.prototype.decodeInternal = function(level) {
	if (level > 256) {
		throw new Error("CBOR nesting too deep")
	}
	let t, l, r
	[t, l] = this.getCBORTypeLen()
	// console.log("decode level " + level.toString() + " type " + t.toString() + " len " + l.toString())
	switch (t) {
		case 0:
			r = this.decodeInteger(l)
			break
		case 1:
			r = this.decodeNegint(l)
			break
		case 2:
			r = this.decodeByteString(l)
			break
		case 3:
			r = this.decodeTextString(l)
			break
		case 4:
			r = this.decodeArray(l, level + 1)
			break
		case 5:
			r = this.decodeMap(l, level + 1)
			break
		case 6:
			console.log("XXX ignored semantic tag " + this.decodeInteger(l).toString())
			break;
		case 7:
			r = this.decodePrimitive(l)
			break
		default:
			throw new Error("Unsupported type 0x" + t.toString(2) + " len " + l.toString())
	}
	// console.log("decode level " + level.toString() + " value " + JSON.stringify(r))
	return r
}

CBORDecode.prototype.decode = function() {
	return this.decodeInternal(0)
}

// ------------------------------------------------------------------
// a crappy SSH message packer - 20200401 djm@openbsd.org

var SSHMSG = function() {
	this.r = []
}

SSHMSG.prototype.serialise = function() {
	let len = 0
	for (buf of this.r) {
		len += buf.length
	}
	let r = new ArrayBuffer(len)
	let v = new Uint8Array(r)
	let offset = 0
	for (buf of this.r) {
		v.set(buf, offset)
		offset += buf.length
	}
	if (offset != r.byteLength) {
		throw new Error("djm can't count")
	}
	return r
}

SSHMSG.prototype.serialiseBase64 = function(v) {
	let b = this.serialise()
	return btoa(String.fromCharCode(...new Uint8Array(b)));
}

SSHMSG.prototype.putU8 = function(v) {
	this.r.push(new Uint8Array([v]))
}

SSHMSG.prototype.putU32 = function(v) {
	this.r.push(new Uint8Array([
		(v >> 24) & 0xff,
		(v >> 16) & 0xff,
		(v >> 8) & 0xff,
		(v & 0xff)
	]))
}

SSHMSG.prototype.put = function(v) {
	this.r.push(new Uint8Array(v))
}

SSHMSG.prototype.putString = function(v) {
	let enc = new TextEncoder();
	let venc = enc.encode(v)
	this.putU32(venc.length)
	this.put(venc)
}

SSHMSG.prototype.putSSHMSG = function(v) {
	let msg = v.serialise()
	this.putU32(msg.byteLength)
	this.put(msg)
}

SSHMSG.prototype.putBytes = function(v) {
	this.putU32(v.byteLength)
	this.put(v)
}

SSHMSG.prototype.putECPoint = function(x, y) {
	let x8 = new Uint8Array(x)
	let y8 = new Uint8Array(y)
	this.putU32(1 + x8.length + y8.length)
	this.putU8(0x04) // Uncompressed point format.
	this.put(x8)
	this.put(y8)
}

// ------------------------------------------------------------------
// webauthn to SSH glue - djm@openbsd.org 20200408

function error(msg, ...args) {
	document.getElementById("error").innerText = msg
	console.log(msg)
	for (const arg of args) {
		console.dir(arg)
	}
}
function hexdump(buf) {
	const hex = Array.from(new Uint8Array(buf)).map(
		b => b.toString(16).padStart(2, "0"))
	const fmt = new Array()
	for (let i = 0; i < hex.length; i++) {
		if ((i % 16) == 0) {
			// Prepend length every 16 bytes.
			fmt.push(i.toString(16).padStart(4, "0"))
			fmt.push("  ")
		}
		fmt.push(hex[i])
		fmt.push(" ")
		if ((i % 16) == 15) {
			fmt.push("\n")
		}
	}
	return fmt.join("")
}
function enrollform_submit(event) {
	event.preventDefault();
	console.log("submitted")
	username = event.target.elements.username.value
	if (username === "") {
		error("no username specified")
		return false
	}
	enrollStart(username)
}
function enrollStart(username) {
	let challenge = new Uint8Array(32)
	window.crypto.getRandomValues(challenge)
	let userid = new Uint8Array(8)
	window.crypto.getRandomValues(userid)

	console.log("challenge:" + btoa(challenge))
	console.log("userid:" + btoa(userid))

	let pkopts = {
		challenge: challenge,
		rp: {
			name: "mindrot.org",
			id: "mindrot.org",
		},
		user: {
			id: userid,
			name: username,
			displayName: username,
		},
		authenticatorSelection: {
			authenticatorAttachment: "cross-platform",
			userVerification: "discouraged",
		},
		pubKeyCredParams: [{alg: -7, type: "public-key"}], // ES256
		timeout: 30 * 1000,
	};
	console.dir(pkopts)
	window.enrollOpts = pkopts
	let credpromise = navigator.credentials.create({ publicKey: pkopts });
	credpromise.then(enrollSuccess, enrollFailure)
}
function enrollFailure(result) {
	error("Enroll failed", result)
}
function enrollSuccess(result) {
	console.log("Enroll succeeded")
	console.dir(result)
	window.enrollResult = result
	document.getElementById("enrollresult").style.visibility = "visible"

	// Show the clientData
	let u8dec = new TextDecoder('utf-8')
	clientData = u8dec.decode(result.response.clientDataJSON)
	document.getElementById("enrollresultjson").innerText = clientData

	// Decode and show the attestationObject
	document.getElementById("enrollresultraw").innerText = hexdump(result.response.attestationObject)
	let aod = new CBORDecode(result.response.attestationObject)
	let attestationObject = aod.decode()
	console.log("attestationObject")
	console.dir(attestationObject)
	document.getElementById("enrollresultattestobj").innerText = JSON.stringify(attestationObject)

	// Decode and show the authData
	document.getElementById("enrollresultauthdataraw").innerText = hexdump(attestationObject.authData)
	let authData = decodeAuthenticatorData(attestationObject.authData, true)
	console.log("authData")
	console.dir(authData)
	window.enrollAuthData = authData
	document.getElementById("enrollresultauthdata").innerText = JSON.stringify(authData)

	// Reformat the pubkey as a SSH key for easy verification
	window.rawKey = reformatPubkey(authData.attestedCredentialData.credentialPublicKey, window.enrollOpts.rp.id)
	console.log("SSH pubkey blob")
	console.dir(window.rawKey)
	document.getElementById("enrollresultpkblob").innerText = hexdump(window.rawKey)
	let pk64 = btoa(String.fromCharCode(...new Uint8Array(window.rawKey)));
	let pk = "sk-ecdsa-sha2-nistp256@openssh.com " + pk64
	document.getElementById("enrollresultpk").innerText = pk

	// Success: show the assertion form.
	document.getElementById("assertsection").style.visibility = "visible"
}

function decodeAuthenticatorData(authData, expectCred) {
	let r = new Object()
	let v = new DataView(authData)

	r.rpIdHash = authData.slice(0, 32)
	r.flags = v.getUint8(32)
	r.signCount = v.getUint32(33)

	// Decode attestedCredentialData if present.
	let offset = 37
	let acd = new Object()
	if (expectCred) {
		acd.aaguid = authData.slice(offset, offset+16)
		offset += 16
		let credentialIdLength = v.getUint16(offset)     
		offset += 2
		acd.credentialIdLength = credentialIdLength
		acd.credentialId = authData.slice(offset, offset+credentialIdLength)
		offset += credentialIdLength
		r.attestedCredentialData = acd
	}
	console.log("XXXXX " + offset.toString())
	let pubkeyrest = authData.slice(offset, authData.byteLength)
	let pkdecode = new CBORDecode(pubkeyrest)
	if (expectCred) {
		// XXX unsafe: doesn't mandate COSE canonical format.
		acd.credentialPublicKey = pkdecode.decode()
	}
	if (!pkdecode.empty()) {
		// Decode extensions if present.
		r.extensions = pkdecode.decode()
	}
	return r
}

function reformatPubkey(pk, rpid) {
	// pk is in COSE format. We only care about a tiny subset.
	if (pk[1] != 2) {
		console.dir(pk)
		throw new Error("pubkey is not EC")
	}
	if (pk[-1] != 1) {
		throw new Error("pubkey is not in P256")
	}
	if (pk[3] != -7) {
		throw new Error("pubkey is not ES256")
	}
	if (pk[-2].byteLength != 32 || pk[-3].byteLength != 32) {
		throw new Error("pubkey EC coords have bad length")
	}
	let msg = new SSHMSG()
	msg.putString("sk-ecdsa-sha2-nistp256@openssh.com")	// Key type
	msg.putString("nistp256")				// Key curve
	msg.putECPoint(pk[-2], pk[-3])				// EC key
	msg.putString(rpid)					// RP ID
	return msg.serialise()
}

async function assertform_submit(event) {
	event.preventDefault();
	console.log("submitted")
	message = event.target.elements.message.value
	if (message === "") {
		error("no message specified")
		return false
	}
	let enc = new TextEncoder()
	let encmsg = enc.encode(message)
	window.assertSignRaw = !event.target.elements.message_sshsig.checked
	console.log("using sshsig ", !window.assertSignRaw)
	if (window.assertSignRaw) {
		assertStart(encmsg)
		return
	}
	// Format a sshsig-style message.
	window.sigHashAlg = "sha512"
	let msghash = await crypto.subtle.digest("SHA-512", encmsg);
	console.log("raw message hash")
	console.dir(msghash)
	window.sigNamespace = event.target.elements.message_namespace.value
	let sigbuf = new SSHMSG()
	sigbuf.put(enc.encode("SSHSIG"))
	sigbuf.putString(window.sigNamespace)
	sigbuf.putU32(0) // Reserved string
	sigbuf.putString(window.sigHashAlg)
	sigbuf.putBytes(msghash)
	let msg = sigbuf.serialise()
	console.log("sigbuf")
	console.dir(msg)
	assertStart(msg)
}

function assertStart(message) {
	let assertReqOpts = {
		challenge: message,
		rpId: "mindrot.org",
		allowCredentials: [{
			type: 'public-key',
			id: window.enrollResult.rawId,
		}],
		userVerification: "discouraged",
		timeout: (30 * 1000),
	}
	console.log("assertReqOpts")
	console.dir(assertReqOpts)
	window.assertReqOpts = assertReqOpts
	let assertpromise = navigator.credentials.get({
		publicKey: assertReqOpts
	});
	assertpromise.then(assertSuccess, assertFailure)
}
function assertFailure(result) {
	error("Assertion failed", result)
}
function linewrap(s) {
	const linelen = 70
	let ret = ""
	for (let i = 0; i < s.length; i += linelen) {
		end = i + linelen
		if (end > s.length) {
			end = s.length
		}
		if (i > 0) {
			ret += "\n"
		}
		ret += s.slice(i, end)
	}
	return ret + "\n"
}
function assertSuccess(result) {
	console.log("Assertion succeeded")
	console.dir(result)
	window.assertResult = result
	document.getElementById("assertresult").style.visibility = "visible"

	// show the clientData.
	let u8dec = new TextDecoder('utf-8')
	clientData = u8dec.decode(result.response.clientDataJSON)
	document.getElementById("assertresultjson").innerText = clientData

	// show the signature.
	document.getElementById("assertresultsigraw").innerText = hexdump(result.response.signature)
	
	// decode and show the authData.
	document.getElementById("assertresultauthdataraw").innerText = hexdump(result.response.authenticatorData)
	authData = decodeAuthenticatorData(result.response.authenticatorData, false)
	document.getElementById("assertresultauthdata").innerText = JSON.stringify(authData)

	// Parse and reformat the signature to an SSH style signature.
	let sshsig = reformatSignature(result.response.signature, clientData, authData)
	document.getElementById("assertresultsshsigraw").innerText = hexdump(sshsig)
	let sig64 = btoa(String.fromCharCode(...new Uint8Array(sshsig)));
	if (window.assertSignRaw) {
		document.getElementById("assertresultsshsigb64").innerText = sig64
	} else {
		document.getElementById("assertresultsshsigb64").innerText =
		    "-----BEGIN SSH SIGNATURE-----\n" + linewrap(sig64) +
		    "-----END SSH SIGNATURE-----\n";
	}
}

function reformatSignature(sig, clientData, authData) {
	if (sig.byteLength < 2) {
		throw new Error("signature is too short")
	}
	let offset = 0
	let v = new DataView(sig)
	// Expect an ASN.1 SEQUENCE that exactly spans the signature.
	if (v.getUint8(offset) != 0x30) {
		throw new Error("signature not an ASN.1 sequence")
	}
	offset++
	let seqlen = v.getUint8(offset)
	offset++
	if ((seqlen & 0x80) != 0 || seqlen != sig.byteLength - offset) {
		throw new Error("signature has unexpected length " + seqlen.toString() + " vs expected " + (sig.byteLength - offset).toString())
	}

	// Parse 'r' INTEGER value.
	if (v.getUint8(offset) != 0x02) {
		throw new Error("signature r not an ASN.1 integer")
	}
	offset++
	let rlen = v.getUint8(offset)
	offset++
	if ((rlen & 0x80) != 0 || rlen > sig.byteLength - offset) {
		throw new Error("signature r has unexpected length " + rlen.toString() + " vs buffer " + (sig.byteLength - offset).toString())
	}
	let r = sig.slice(offset, offset + rlen)
	offset += rlen
	console.log("sig_r")
	console.dir(r)

	// Parse 's' INTEGER value.
	if (v.getUint8(offset) != 0x02) {
		throw new Error("signature r not an ASN.1 integer")
	}
	offset++
	let slen = v.getUint8(offset)
	offset++
	if ((slen & 0x80) != 0 || slen > sig.byteLength - offset) {
		throw new Error("signature s has unexpected length " + slen.toString() + " vs buffer " + (sig.byteLength - offset).toString())
	}
	let s = sig.slice(offset, offset + slen)
	console.log("sig_s")
	console.dir(s)
	offset += slen

	if (offset != sig.byteLength) {
		throw new Error("unexpected final offset during signature parsing " + offset.toString() + " expected " + sig.byteLength.toString())
	}
	
	// Reformat as an SSH signature.
	let clientDataParsed = JSON.parse(clientData)
	let innersig = new SSHMSG()
	innersig.putBytes(r)
	innersig.putBytes(s)

	let rawsshsig = new SSHMSG()
	rawsshsig.putString("webauthn-sk-ecdsa-sha2-nistp256@openssh.com")
	rawsshsig.putSSHMSG(innersig)
	rawsshsig.putU8(authData.flags)
	rawsshsig.putU32(authData.signCount)
	rawsshsig.putString(clientDataParsed.origin)
	rawsshsig.putString(clientData)
	if (authData.extensions == undefined) {
		rawsshsig.putU32(0)
	} else {
		rawsshsig.putBytes(authData.extensions)
	}

	if (window.assertSignRaw) {
		return rawsshsig.serialise()
	}
	// Format as SSHSIG.
	let enc = new TextEncoder()
	let sshsig = new SSHMSG()
	sshsig.put(enc.encode("SSHSIG"))
	sshsig.putU32(0x01) // Signature version.
	sshsig.putBytes(window.rawKey)
	sshsig.putString(window.sigNamespace)
	sshsig.putU32(0) // Reserved string
	sshsig.putString(window.sigHashAlg)
	sshsig.putBytes(rawsshsig.serialise())
	return sshsig.serialise()
}

function toggleNamespaceVisibility() {
	const assertsigtype = document.getElementById('message_sshsig');
	const assertsignamespace = document.getElementById('message_namespace');
	assertsignamespace.disabled = !assertsigtype.checked;
}

function init() {
	if (document.location.protocol != "https:") {
		error("This page must be loaded via https")
		const assertsubmit = document.getElementById('assertsubmit')
		assertsubmit.disabled = true
	}
	const enrollform = document.getElementById('enrollform');
	enrollform.addEventListener('submit', enrollform_submit);
	const assertform = document.getElementById('assertform');
	assertform.addEventListener('submit', assertform_submit);
	const assertsigtype = document.getElementById('message_sshsig');
	assertsigtype.onclick = toggleNamespaceVisibility;
}
</script>

</html>