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
use std::convert::TryFrom;
use std::convert::TryInto;
use std::io;
use std::time::SystemTime;
use anyhow::{Context, Result};
use openpgp::armor;
use openpgp::cert::amalgamation::key::ValidErasedKeyAmalgamation;
use openpgp::crypto::mpi;
use openpgp::packet::{
key::{Key4, KeyRole, PrimaryRole, SecretParts, SubordinateRole},
signature::SignatureBuilder,
Key, UserID,
};
use openpgp::parse::{stream::DecryptorBuilder, Parse};
use openpgp::policy::Policy;
use openpgp::serialize::stream::{Message, Signer};
use openpgp::types::{KeyFlags, PublicKeyAlgorithm, SignatureType, Timestamp};
use openpgp::{Cert, Packet};
use sequoia_openpgp as openpgp;
use sequoia_openpgp::types::{HashAlgorithm, SymmetricAlgorithm};
use openpgp_card::algorithm::{Algo, Curve};
use openpgp_card::card_do::{Fingerprint, KeyGenerationTime};
use openpgp_card::crypto_data::{CardUploadableKey, PublicKeyMaterial};
use openpgp_card::{Error, KeyType, OpenPgpTransaction};
use crate::card::Open;
use crate::privkey::SequoiaKey;
use crate::{decryptor, signer, PublicKey};
pub fn make_cert<'app>(
open: &mut Open<'app>,
key_sig: PublicKey,
key_dec: Option<PublicKey>,
key_aut: Option<PublicKey>,
pw1: Option<&[u8]>,
pinpad_prompt: &dyn Fn(),
touch_prompt: &(dyn Fn() + Send + Sync),
) -> Result<Cert> {
let mut pp = vec![];
let pri = PrimaryRole::convert_key(key_sig.clone());
pp.push(Packet::from(pri));
if let Some(key_dec) = key_dec {
let sub_dec = SubordinateRole::convert_key(key_dec);
pp.push(Packet::from(sub_dec.clone()));
let cert = Cert::try_from(pp.clone())?;
{
let signing_builder = SignatureBuilder::new(SignatureType::SubkeyBinding)
.set_signature_creation_time(SystemTime::now())?
.set_key_validity_period(std::time::Duration::new(0, 0))?
.set_key_flags(
KeyFlags::empty()
.set_storage_encryption()
.set_transport_encryption(),
)?;
if let Some(pw1) = pw1 {
open.verify_user_for_signing(pw1)?;
} else {
open.verify_user_for_signing_pinpad(pinpad_prompt)?;
}
if let Some(mut sign) = open.signing_card() {
let mut card_signer = sign.signer_from_pubkey(key_sig.clone(), touch_prompt);
let signing_bsig: Packet = sub_dec
.bind(&mut card_signer, &cert, signing_builder)?
.into();
pp.push(signing_bsig);
}
}
}
if let Some(key_aut) = key_aut {
let sub_aut = SubordinateRole::convert_key(key_aut);
pp.push(Packet::from(sub_aut.clone()));
{
let signing_builder = SignatureBuilder::new(SignatureType::SubkeyBinding)
.set_signature_creation_time(SystemTime::now())?
.set_key_validity_period(std::time::Duration::new(0, 0))?
.set_key_flags(KeyFlags::empty().set_authentication())?;
if let Some(pw1) = pw1 {
open.verify_user_for_signing(pw1)?;
} else {
open.verify_user_for_signing_pinpad(pinpad_prompt)?;
}
if let Some(mut sign) = open.signing_card() {
let mut card_signer = sign.signer_from_pubkey(key_sig.clone(), touch_prompt);
let cert = Cert::try_from(pp.clone())?;
let signing_bsig: Packet = sub_aut
.bind(&mut card_signer, &cert, signing_builder)?
.into();
pp.push(signing_bsig);
}
}
}
let cardholder = open.cardholder_related_data()?;
if let Some(name) = cardholder.name() {
let uid: UserID = name.into();
pp.push(uid.clone().into());
{
let signing_builder = SignatureBuilder::new(SignatureType::PositiveCertification)
.set_signature_creation_time(SystemTime::now())?
.set_key_validity_period(std::time::Duration::new(0, 0))?
.set_key_flags(
KeyFlags::empty().set_signing().set_certification(),
)?;
if let Some(pw1) = pw1 {
open.verify_user_for_signing(pw1)?;
} else {
open.verify_user_for_signing_pinpad(pinpad_prompt)?;
}
if let Some(mut sign) = open.signing_card() {
let mut card_signer = sign.signer_from_pubkey(key_sig, touch_prompt);
let cert = Cert::try_from(pp.clone())?;
let signing_bsig: Packet =
uid.bind(&mut card_signer, &cert, signing_builder)?.into();
pp.push(signing_bsig);
}
}
}
Cert::try_from(pp)
}
pub fn public_key_material_and_fp_to_key(
pkm: &PublicKeyMaterial,
key_type: KeyType,
time: &KeyGenerationTime,
fingerprint: &Fingerprint,
) -> Result<PublicKey, Error> {
let param: &[_] = match (pkm, key_type) {
(PublicKeyMaterial::E(_), KeyType::Decryption) => &[
(
Some(HashAlgorithm::SHA256),
Some(SymmetricAlgorithm::AES128),
),
(
Some(HashAlgorithm::SHA512),
Some(SymmetricAlgorithm::AES256),
),
(
Some(HashAlgorithm::SHA384),
Some(SymmetricAlgorithm::AES256),
),
(
Some(HashAlgorithm::SHA384),
Some(SymmetricAlgorithm::AES192),
),
(
Some(HashAlgorithm::SHA256),
Some(SymmetricAlgorithm::AES256),
),
],
_ => &[(None, None)],
};
for (hash, sym) in param {
if let Ok(key) = public_key_material_to_key(pkm, key_type, time, *hash, *sym) {
if key.fingerprint().as_bytes() == fingerprint.as_bytes() {
return Ok(key);
}
}
}
Err(Error::InternalError(
"Couldn't find key with matching fingerprint".to_string(),
))
}
pub fn key_slot(open: &mut Open, kt: KeyType) -> Result<Option<PublicKey>> {
let times = open.key_generation_times()?;
let fps = open.fingerprints()?;
match kt {
KeyType::Signing => {
if let Ok(pkm) = open.public_key(KeyType::Signing) {
if let Some(ts) = times.signature() {
return Ok(Some(public_key_material_and_fp_to_key(
&pkm,
KeyType::Signing,
ts,
fps.signature().expect("Signature fingerprint is unset"),
)?));
}
}
Ok(None)
}
KeyType::Decryption => {
if let Ok(pkm) = open.public_key(KeyType::Decryption) {
if let Some(ts) = times.decryption() {
return Ok(Some(public_key_material_and_fp_to_key(
&pkm,
KeyType::Decryption,
ts,
fps.decryption().expect("Decryption fingerprint is unset"),
)?));
}
}
Ok(None)
}
KeyType::Authentication => {
if let Ok(pkm) = open.public_key(KeyType::Authentication) {
if let Some(ts) = times.authentication() {
return Ok(Some(public_key_material_and_fp_to_key(
&pkm,
KeyType::Authentication,
ts,
fps.authentication()
.expect("Authentication fingerprint is unset"),
)?));
}
}
Ok(None)
}
_ => unimplemented!(),
}
}
pub fn public_key_material_to_key(
pkm: &PublicKeyMaterial,
key_type: KeyType,
time: &KeyGenerationTime,
hash: Option<HashAlgorithm>,
sym: Option<SymmetricAlgorithm>,
) -> Result<PublicKey, Error> {
let time = Timestamp::from(time.get()).into();
match pkm {
PublicKeyMaterial::R(rsa) => {
let k4 = Key4::import_public_rsa(rsa.v(), rsa.n(), Some(time)).map_err(|e| {
Error::InternalError(format!("sequoia Key4::import_public_rsa failed: {:?}", e))
})?;
Ok(k4.into())
}
PublicKeyMaterial::E(ecc) => {
let algo = ecc.algo().clone();
if let Algo::Ecc(algo_ecc) = algo {
let curve = match algo_ecc.curve() {
Curve::NistP256r1 => openpgp::types::Curve::NistP256,
Curve::NistP384r1 => openpgp::types::Curve::NistP384,
Curve::NistP521r1 => openpgp::types::Curve::NistP521,
Curve::Ed25519 => openpgp::types::Curve::Ed25519,
Curve::Cv25519 => openpgp::types::Curve::Cv25519,
c => unimplemented!("unhandled curve: {:?}", c),
};
match key_type {
KeyType::Authentication | KeyType::Signing => {
if algo_ecc.curve() == Curve::Ed25519 {
let k4 =
Key4::import_public_ed25519(ecc.data(), time).map_err(|e| {
Error::InternalError(format!(
"sequoia Key4::import_public_ed25519 failed: {:?}",
e
))
})?;
Ok(Key::from(k4))
} else {
let k4 = Key4::new(
time,
PublicKeyAlgorithm::ECDSA,
mpi::PublicKey::ECDSA {
curve,
q: mpi::MPI::new(ecc.data()),
},
)
.map_err(|e| {
Error::InternalError(format!(
"sequoia Key4::new for ECDSA failed: {:?}",
e
))
})?;
Ok(k4.into())
}
}
KeyType::Decryption => {
if algo_ecc.curve() == Curve::Cv25519 {
let k4 = Key4::import_public_cv25519(ecc.data(), hash, sym, time)
.map_err(|e| {
Error::InternalError(format!(
"sequoia Key4::import_public_cv25519 failed: {:?}",
e
))
})?;
Ok(k4.into())
} else {
let k4 = Key4::new(
time,
PublicKeyAlgorithm::ECDH,
mpi::PublicKey::ECDH {
curve,
q: mpi::MPI::new(ecc.data()),
hash: hash.unwrap_or_default(),
sym: sym.unwrap_or_default(),
},
)
.map_err(|e| {
Error::InternalError(format!(
"sequoia Key4::new for ECDH failed: {:?}",
e
))
})?;
Ok(k4.into())
}
}
_ => unimplemented!("Unsupported KeyType"),
}
} else {
panic!("unexpected algo {:?}", algo);
}
}
_ => unimplemented!("Unexpected PublicKeyMaterial type"),
}
}
pub(crate) fn public_to_fingerprint(
pkm: &PublicKeyMaterial,
time: &KeyGenerationTime,
kt: KeyType,
hash: Option<HashAlgorithm>,
sym: Option<SymmetricAlgorithm>,
) -> Result<Fingerprint, Error> {
let key = public_key_material_to_key(pkm, kt, time, hash, sym)?;
let fp = key.fingerprint();
fp.as_bytes().try_into()
}
pub fn vka_as_uploadable_key(
vka: ValidErasedKeyAmalgamation<SecretParts>,
password: Option<String>,
) -> Box<dyn CardUploadableKey> {
let sqk = SequoiaKey::new(vka, password);
Box::new(sqk)
}
pub fn sign(
card_tx: &'_ mut OpenPgpTransaction<'_>,
cert: &Cert,
input: &mut dyn io::Read,
touch_prompt: &(dyn Fn() + Send + Sync),
) -> Result<String> {
let mut armorer = armor::Writer::new(vec![], armor::Kind::Signature)?;
{
let s = signer::CardSigner::with_cert(card_tx, cert, touch_prompt)?;
let message = Message::new(&mut armorer);
let mut message = Signer::new(message, s).detached().build()?;
io::copy(input, &mut message)?;
message.finalize()?;
}
let buffer = armorer.finalize()?;
String::from_utf8(buffer).context("Failed to convert signature to utf8")
}
pub fn decrypt(
card_tx: &'_ mut OpenPgpTransaction<'_>,
cert: &Cert,
msg: Vec<u8>,
touch_prompt: &(dyn Fn() + Send + Sync),
p: &dyn Policy,
) -> Result<Vec<u8>> {
let mut decrypted = Vec::new();
{
let reader = io::BufReader::new(&msg[..]);
let d = decryptor::CardDecryptor::new(card_tx, cert, touch_prompt)?;
let db = DecryptorBuilder::from_reader(reader)?;
let mut decryptor = db.with_policy(p, None, d)?;
io::copy(&mut decryptor, &mut decrypted)?;
}
Ok(decrypted)
}