/
mod.ts
280 lines (258 loc) · 9 KB
/
mod.ts
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
// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
import {
crypto as wasmCrypto,
DigestAlgorithm as WasmDigestAlgorithm,
digestAlgorithms as wasmDigestAlgorithms,
} from "../_wasm_crypto/mod.ts";
type WebCryptoAlgorithmIdentifier = string | { name: string };
// TODO(jeremyBanks): Remove this once the built-in `Crypto` interface is
// complete and stable. For now we use this incomplete-but-stable definition.
export interface WebCrypto {
getRandomValues<T extends BufferSource>(buffer: T): T;
randomUUID?(): string;
subtle?: {
// see https://www.w3.org/TR/WebCryptoAPI/#subtlecrypto-interface
/**
* Returns a new `Promise` object that will encrypt `data` using the
* specified `AlgorithmIdentifier` with the supplied `CryptoKey`.
*/
encrypt?(
algorithm: WebCryptoAlgorithmIdentifier,
key: unknown,
data: BufferSource,
): Promise<unknown>;
/**
* Returns a new `Promise` object that will decrypt `data` using the
* specified `AlgorithmIdentifier` with the supplied `CryptoKey`.
*/
decrypt?(
algorithm: WebCryptoAlgorithmIdentifier,
key: unknown,
data: BufferSource,
): Promise<unknown>;
/**
* Returns a new `Promise` object that will sign `data` using the specified
* `AlgorithmIdentifier` with the supplied `CryptoKey`.
*/
sign?(
algorithm: WebCryptoAlgorithmIdentifier,
key: unknown,
data: BufferSource,
): Promise<unknown>;
/**
* Returns a new `Promise` object that will verify `data` using the
* specified `AlgorithmIdentifier` with the supplied `CryptoKey`.
*/
verify?(
algorithm: WebCryptoAlgorithmIdentifier,
key: unknown,
signature: BufferSource,
data: BufferSource,
): Promise<unknown>;
/**
* Returns a new `Promise` object that will digest `data` using the
* specified `AlgorithmIdentifier`.
*/
digest?(
algorithm: WebCryptoAlgorithmIdentifier,
data: BufferSource,
): Promise<ArrayBuffer>;
generateKey?(
algorithm: WebCryptoAlgorithmIdentifier,
extractable: boolean,
keyUsages: string[],
): Promise<unknown>;
deriveKey?(
algorithm: WebCryptoAlgorithmIdentifier,
baseKey: unknown,
derivedKeyType: string,
extractable: boolean,
keyUsages: string[],
): Promise<unknown>;
deriveBits?(
algorithm: WebCryptoAlgorithmIdentifier,
baseKey: unknown,
length: number,
): Promise<unknown>;
importKey?(
format: string,
keyData: BufferSource | unknown,
algorithm: WebCryptoAlgorithmIdentifier,
extractable: boolean,
keyUsages: string[],
): Promise<unknown>;
exportKey?(format: string, key: unknown): Promise<unknown>;
wrapKey?(
format: string,
key: unknown,
wrappingKey: unknown,
wrappingAlgorithm: WebCryptoAlgorithmIdentifier,
): Promise<unknown>;
unwrapKey?(
format: string,
wrappedKey: BufferSource,
unwrappingKey: unknown,
unwrapAlgorithm: WebCryptoAlgorithmIdentifier,
unwrappedKeyAlgorithm: WebCryptoAlgorithmIdentifier,
extractable: boolean,
keyUsages: string[],
): Promise<unknown>;
};
}
/**
* A copy of the global WebCrypto interface, with methods bound so they're
* safe to re-export.
*/
const webCrypto: WebCrypto = ((crypto) => ({
getRandomValues: crypto.getRandomValues?.bind(crypto),
randomUUID: crypto.randomUUID?.bind(crypto),
subtle: {
decrypt: crypto.subtle?.decrypt?.bind(crypto.subtle),
deriveBits: crypto.subtle?.deriveBits?.bind(crypto.subtle),
deriveKey: crypto.subtle?.deriveKey?.bind(crypto.subtle),
digest: crypto.subtle?.digest?.bind(crypto.subtle),
encrypt: crypto.subtle?.encrypt?.bind(crypto.subtle),
exportKey: crypto.subtle?.exportKey?.bind(crypto.subtle),
generateKey: crypto.subtle?.generateKey?.bind(crypto.subtle),
importKey: crypto.subtle?.importKey?.bind(crypto.subtle),
sign: crypto.subtle?.sign?.bind(crypto.subtle),
unwrapKey: crypto.subtle?.unwrapKey?.bind(crypto.subtle),
verify: crypto.subtle?.verify?.bind(crypto.subtle),
wrapKey: crypto.subtle?.wrapKey?.bind(crypto.subtle),
},
}))(globalThis.crypto as WebCrypto);
const bufferSourceBytes = (data: BufferSource | unknown) => {
let bytes: Uint8Array | undefined;
if (data instanceof Uint8Array) {
bytes = data;
} else if (ArrayBuffer.isView(data)) {
bytes = new Uint8Array(
data.buffer,
data.byteOffset,
data.byteLength,
);
} else if (data instanceof ArrayBuffer) {
bytes = new Uint8Array(data);
}
return bytes;
};
/**
* An wrapper for WebCrypto adding support for additional non-standard
* algorithms, but delegating to the runtime WebCrypto implementation whenever
* possible.
*/
const stdCrypto = (<T extends WebCrypto>(x: T) => x)({
...webCrypto,
subtle: {
...webCrypto.subtle,
/**
* Returns a new `Promise` object that will digest `data` using the specified
* `AlgorithmIdentifier`.
*/
async digest(
algorithm: DigestAlgorithm,
data: BufferSource | AsyncIterable<BufferSource> | Iterable<BufferSource>,
): Promise<ArrayBuffer> {
const { name, length } = normalizeAlgorithm(algorithm);
const bytes = bufferSourceBytes(data);
// We delegate to WebCrypto whenever possible,
if (
// if the SubtleCrypto interface is available,
webCrypto.subtle?.digest &&
// if the algorithm is supported by the WebCrypto standard,
(webCryptoDigestAlgorithms as readonly string[]).includes(name) &&
// and the data is a single buffer,
bytes
) {
return webCrypto.subtle.digest(algorithm, bytes);
} else if (wasmDigestAlgorithms.includes(name)) {
if (bytes) {
// Otherwise, we use our bundled WASM implementation via digestSync
// if it supports the algorithm.
return stdCrypto.subtle.digestSync(algorithm, bytes);
} else if ((data as Iterable<BufferSource>)[Symbol.iterator]) {
return stdCrypto.subtle.digestSync(
algorithm,
data as Iterable<BufferSource>,
);
} else if (
(data as AsyncIterable<BufferSource>)[Symbol.asyncIterator]
) {
const context = new wasmCrypto.DigestContext(name);
for await (const chunk of data as AsyncIterable<BufferSource>) {
const chunkBytes = bufferSourceBytes(chunk);
if (!chunkBytes) {
throw new TypeError("data contained chunk of the wrong type");
}
context.update(chunkBytes);
}
return context.digestAndDrop(length).buffer;
} else {
throw new TypeError(
"data must be a BufferSource or [Async]Iterable<BufferSource>",
);
}
} else if (webCrypto.subtle?.digest) {
// (TypeScript type definitions prohibit this case.) If they're trying
// to call an algorithm we don't recognize, pass it along to WebCrypto
// in case it's a non-standard algorithm supported by the the runtime
// they're using.
return webCrypto.subtle.digest(
algorithm,
(data as unknown) as Uint8Array,
);
} else {
throw new TypeError(`unsupported digest algorithm: ${algorithm}`);
}
},
/**
* Returns a ArrayBuffer with the result of digesting `data` using the
* specified `AlgorithmIdentifier`.
*/
digestSync(
algorithm: DigestAlgorithm,
data: BufferSource | Iterable<BufferSource>,
): ArrayBuffer {
algorithm = normalizeAlgorithm(algorithm);
const bytes = bufferSourceBytes(data);
if (bytes) {
return wasmCrypto.digest(algorithm.name, bytes, algorithm.length)
.buffer;
} else if ((data as Iterable<BufferSource>)[Symbol.iterator]) {
const context = new wasmCrypto.DigestContext(algorithm.name);
for (const chunk of data as Iterable<BufferSource>) {
const chunkBytes = bufferSourceBytes(chunk);
if (!chunkBytes) {
throw new TypeError("data contained chunk of the wrong type");
}
context.update(chunkBytes);
}
return context.digestAndDrop(algorithm.length).buffer;
} else {
throw new TypeError(
"data must be a BufferSource or Iterable<BufferSource>",
);
}
},
},
});
/** Digest algorithms supported by WebCrypto. */
const webCryptoDigestAlgorithms = [
"SHA-384",
"SHA-256",
"SHA-512",
// insecure (length-extendable and collidable):
"SHA-1",
] as const;
type DigestAlgorithmName = WasmDigestAlgorithm;
type DigestAlgorithmObject = {
name: DigestAlgorithmName;
length?: number;
};
type DigestAlgorithm = DigestAlgorithmName | DigestAlgorithmObject;
const normalizeAlgorithm = (algorithm: DigestAlgorithm) =>
((typeof algorithm === "string") ? { name: algorithm.toUpperCase() } : {
...algorithm,
name: algorithm.name.toUpperCase(),
}) as DigestAlgorithmObject;
export { stdCrypto as crypto };