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
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
use ecdsa::signature::hazmat::{PrehashVerifier, RandomizedPrehashSigner};
use ecdsa::{Signature, SigningKey, VerifyingKey};
use js::context::JSContext;
use p256::NistP256;
use p384::NistP384;
use p521::NistP521;
use crate::dom::bindings::codegen::Bindings::CryptoKeyBinding::{
CryptoKeyMethods, CryptoKeyPair, KeyType, KeyUsage,
};
use crate::dom::bindings::codegen::Bindings::SubtleCryptoBinding::KeyFormat;
use crate::dom::bindings::error::Error;
use crate::dom::bindings::root::DomRoot;
use crate::dom::cryptokey::{CryptoKey, Handle};
use crate::dom::globalscope::GlobalScope;
use crate::dom::subtlecrypto::ec_common::EcAlgorithm;
use crate::dom::subtlecrypto::{
ExportedKey, KeyAlgorithmAndDerivatives, NAMED_CURVE_P256, NAMED_CURVE_P384, NAMED_CURVE_P521,
SubtleEcKeyGenParams, SubtleEcKeyImportParams, SubtleEcdsaParams, ec_common,
};
/// <https://w3c.github.io/webcrypto/#ecdsa-operations-sign>
pub(crate) fn sign(
normalized_algorithm: &SubtleEcdsaParams,
key: &CryptoKey,
message: &[u8],
) -> Result<Vec<u8>, Error> {
// Step 1. If the [[type]] internal slot of key is not "private", then throw an
// InvalidAccessError.
if key.Type() != KeyType::Private {
return Err(Error::InvalidAccess(Some(
"The key type is not private.".into(),
)));
}
// Step 2. Let hashAlgorithm be the hash member of normalizedAlgorithm.
let hash_algorithm = &normalized_algorithm.hash;
// Step 3. Let M be the result of performing the digest operation specified by hashAlgorithm
// using message.
let m = hash_algorithm.digest(message)?;
// Step 4. Let d be the ECDSA private key associated with key.
// Step 5. Let params be the EC domain parameters associated with key.
// Step 6.
// If the namedCurve attribute of the [[algorithm]] internal slot of key is "P-256", "P-384" or
// "P-521":
// 1. Perform the ECDSA signing process, as specified in [RFC6090], Section 5.4.2, with M
// as the message, using params as the EC domain parameters, and with d as the private
// key.
// 2. Let r and s be the pair of integers resulting from performing the ECDSA signing
// process.
// 3. Let result be an empty byte sequence.
// 4. Let n be the smallest integer such that n * 8 is greater than the logarithm to base 2
// of the order of the base point of the elliptic curve identified by params.
// 5. Convert r to a byte sequence of length n and append it to result.
// 6. Convert s to a byte sequence of length n and append it to result.
// Otherwise, the namedCurve attribute of the [[algorithm]] internal slot of key is a value
// specified in an applicable specification:
// Perform the ECDSA signature steps specified in that specification, passing in M, params
// and d and resulting in result.
// NOTE: We currently do not support other applicable specifications.
let KeyAlgorithmAndDerivatives::EcKeyAlgorithm(algorithm) = key.algorithm() else {
return Err(Error::Operation(Some(
"Key algorithm is not a elliptic curve key algorithm.".into(),
)));
};
let mut rng = rand::rng();
let result = match algorithm.named_curve.as_str() {
NAMED_CURVE_P256 => {
let Handle::P256PrivateKey(d) = key.handle() else {
return Err(Error::Operation(Some(
"Key handle is not a P256PrivateKey.".into(),
)));
};
let signing_key = SigningKey::<NistP256>::from(d);
let signature: Signature<NistP256> = signing_key
.sign_prehash_with_rng(&mut rng, &m)
.map_err(|_| Error::Operation(Some("ECDSA signing process failed.".into())))?;
signature.to_vec()
},
NAMED_CURVE_P384 => {
let Handle::P384PrivateKey(d) = key.handle() else {
return Err(Error::Operation(Some(
"Key handle is not a P384PrivateKey.".into(),
)));
};
let signing_key = SigningKey::<NistP384>::from(d);
let signature: Signature<NistP384> = signing_key
.sign_prehash_with_rng(&mut rng, &m)
.map_err(|_| Error::Operation(Some("ECDSA signing process failed.".into())))?;
signature.to_vec()
},
NAMED_CURVE_P521 => {
let Handle::P521PrivateKey(d) = key.handle() else {
return Err(Error::Operation(Some(
"Key handle is not a P521PrivateKey.".into(),
)));
};
let signing_key = SigningKey::<NistP521>::from(d);
let signature: Signature<NistP521> = signing_key
.sign_prehash_with_rng(&mut rng, &m)
.map_err(|_| Error::Operation(Some("ECDSA signing process failed.".into())))?;
signature.to_vec()
},
_ => {
return Err(Error::NotSupported(Some(
"Algorithm's curve is not supported.".into(),
)));
},
};
// Step 7. Return result.
Ok(result)
}
/// <https://w3c.github.io/webcrypto/#ecdsa-operations-verify>
pub(crate) fn verify(
normalized_algorithm: &SubtleEcdsaParams,
key: &CryptoKey,
message: &[u8],
signature: &[u8],
) -> Result<bool, Error> {
// Step 1. If the [[type]] internal slot of key is not "public", then throw an
// InvalidAccessError.
if key.Type() != KeyType::Public {
return Err(Error::InvalidAccess(Some("Key type is not public".into())));
}
// Step 2. Let hashAlgorithm be the hash member of normalizedAlgorithm.
let hash_algorithm = &normalized_algorithm.hash;
// Step 3. Let M be the result of performing the digest operation specified by hashAlgorithm
// using message.
let m = hash_algorithm.digest(message)?;
// Step 4. Let Q be the ECDSA public key associated with key.
// Step 5. Let params be the EC domain parameters associated with key.
// Step 6.
// If the namedCurve attribute of the [[algorithm]] internal slot of key is "P-256", "P-384" or
// "P-521":
// 1. Let n be the smallest integer such that n * 8 is greater than the logarithm to base 2
// of the order of the base point of the elliptic curve identified by params.
// 2. If signature does not have a length of n * 2 bytes, then return false.
// 3. Let r be the result of converting the first n bytes of signature to an integer.
// 4. Let s be the result of converting the last n bytes of signature to an integer.
// 5. Perform the ECDSA verifying process, as specified in [RFC6090], Section 5.4.3, with M
// as the received message, (r, s) as the signature and using params as the EC domain
// parameters, and Q as the public key.
// Otherwise, the namedCurve attribute of the [[algorithm]] internal slot of key is a value
// specified in an applicable specification:
// Perform the ECDSA verification steps specified in that specification passing in M,
// signature, params and Q and resulting in an indication of whether or not the purported
// signature is valid.
// Step 7. Let result be a boolean with the value true if the signature is valid and the value
// false otherwise.
// NOTE: We currently do not support other applicable specifications.
let KeyAlgorithmAndDerivatives::EcKeyAlgorithm(algorithm) = key.algorithm() else {
return Err(Error::Operation(Some(
"Key algorithm is not a elliptic curve key algorithm.".into(),
)));
};
let result = match algorithm.named_curve.as_str() {
NAMED_CURVE_P256 => {
let Handle::P256PublicKey(q) = key.handle() else {
return Err(Error::Operation(Some(
"Key handle is not a P256PublicKey.".into(),
)));
};
match Signature::<NistP256>::from_slice(signature) {
Ok(signature) => {
let verifying_key = VerifyingKey::<NistP256>::from(q);
verifying_key.verify_prehash(&m, &signature).is_ok()
},
Err(_) => false,
}
},
NAMED_CURVE_P384 => {
let Handle::P384PublicKey(q) = key.handle() else {
return Err(Error::Operation(Some(
"Key handle is not a P384PublicKey.".into(),
)));
};
match Signature::<NistP384>::from_slice(signature) {
Ok(signature) => {
let verifying_key = VerifyingKey::<NistP384>::from(q);
verifying_key.verify_prehash(&m, &signature).is_ok()
},
Err(_) => false,
}
},
NAMED_CURVE_P521 => {
let Handle::P521PublicKey(q) = key.handle() else {
return Err(Error::Operation(Some(
"Key handle is not a P521PublicKey.".into(),
)));
};
match Signature::<NistP521>::from_slice(signature) {
Ok(signature) => {
let verifying_key = VerifyingKey::<NistP521>::from(q);
verifying_key.verify_prehash(&m, &signature).is_ok()
},
Err(_) => false,
}
},
_ => {
return Err(Error::NotSupported(Some(
"Algorithm's curve is not supported.".into(),
)));
},
};
// Step 8. Return result.
Ok(result)
}
/// <https://w3c.github.io/webcrypto/#ecdsa-operations-generate-key>
pub(crate) fn generate_key(
cx: &mut JSContext,
global: &GlobalScope,
normalized_algorithm: &SubtleEcKeyGenParams,
extractable: bool,
usages: Vec<KeyUsage>,
) -> Result<CryptoKeyPair, Error> {
ec_common::generate_key(
EcAlgorithm::Ecdsa,
cx,
global,
normalized_algorithm,
extractable,
usages,
)
}
/// <https://w3c.github.io/webcrypto/#ecdsa-operations-import-key>
pub(crate) fn import_key(
cx: &mut JSContext,
global: &GlobalScope,
normalized_algorithm: &SubtleEcKeyImportParams,
format: KeyFormat,
key_data: &[u8],
extractable: bool,
usages: Vec<KeyUsage>,
) -> Result<DomRoot<CryptoKey>, Error> {
ec_common::import_key(
EcAlgorithm::Ecdsa,
cx,
global,
normalized_algorithm,
format,
key_data,
extractable,
usages,
)
}
/// <https://w3c.github.io/webcrypto/#ecdsa-operations-export-key>
pub(crate) fn export_key(format: KeyFormat, key: &CryptoKey) -> Result<ExportedKey, Error> {
ec_common::export_key(format, key)
}
/// <https://wicg.github.io/webcrypto-modern-algos/#SubtleCrypto-method-getPublicKey>
/// Step 9 - 15, for ECDSA
pub(crate) fn get_public_key(
cx: &mut JSContext,
global: &GlobalScope,
key: &CryptoKey,
algorithm: &KeyAlgorithmAndDerivatives,
usages: Vec<KeyUsage>,
) -> Result<DomRoot<CryptoKey>, Error> {
ec_common::get_public_key(cx, global, key, algorithm, usages)
}