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crypto.ts
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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
// This module is browser compatible.
/**
* Extensions to the
* {@link https://developer.mozilla.org/en-US/docs/Web/API/Web_Crypto_API | Web Crypto API}
* supporting additional encryption APIs, but also delegating to the built-in
* APIs when possible.
*
* Provides additional digest algorithms that are not part of the WebCrypto
* standard as well as a `subtle.digest` and `subtle.digestSync` methods.
*
* The {@linkcode KeyStack} export implements the {@linkcode KeyRing} interface
* for managing rotatable keys for signing data to prevent tampering, like with
* HTTP cookies.
*
* ## Supported algorithms
*
* Here is a list of supported algorithms. If the algorithm name in WebCrypto
* and Wasm/Rust is the same, this library prefers to use algorithms that are
* supported by WebCrypto.
*
* WebCrypto:
* - `SHA-384`
* - `SHA-256`
* - `SHA-512` (length-extendable and collidable)
*
* Wasm/Rust:
* - `BLAKE2B-128`
* - `BLAKE2B-160`
* - `BLAKE2B-224`
* - `BLAKE2B-256`
* - `BLAKE2B-384`
* - `BLAKE2B`
* - `BLAKE2S`
* - `BLAKE3`
* - `FNV32` (length-extendable)
* - `FNV32A` (length-extendable)
* - `FNV64` (length-extendable)
* - `FNV64A` (length-extendable)
* - `KECCAK-224`
* - `KECCAK-256`
* - `KECCAK-384`
* - `KECCAK-512`
* - `SHA-384`
* - `SHA3-224`
* - `SHA3-256`
* - `SHA3-384`
* - `SHA3-512`
* - `SHAKE128`
* - `SHAKE256`
* - `TIGER`
* - `RIPEMD-160` (length-extendable)
* - `SHA-224` (length-extendable)
* - `SHA-256` (length-extendable)
* - `SHA-512` (length-extendable)
* - `MD4` (collidable and length-extendable)
* - `MD5` (collidable and length-extendable)
* - `SHA-1` (collidable and length-extendable)
* ```
*
* @example
* ```ts
* import { crypto } from "https://deno.land/std@$STD_VERSION/crypto/mod.ts";
*
* // This will delegate to the runtime's WebCrypto implementation.
* console.log(
* new Uint8Array(
* await crypto.subtle.digest(
* "SHA-384",
* new TextEncoder().encode("hello world"),
* ),
* ),
* );
*
* // This will use a bundled Wasm/Rust implementation.
* console.log(
* new Uint8Array(
* await crypto.subtle.digest(
* "BLAKE3",
* new TextEncoder().encode("hello world"),
* ),
* ),
* );
* ```
*
* @example Convert hash to a string
*
* ```ts
* import {
* crypto,
* } from "https://deno.land/std@$STD_VERSION/crypto/mod.ts";
* import { encodeHex } from "https://deno.land/std@$STD_VERSION/encoding/hex.ts"
* import { encodeBase64 } from "https://deno.land/std@$STD_VERSION/encoding/base64.ts"
*
* const hash = await crypto.subtle.digest(
* "SHA-384",
* new TextEncoder().encode("You hear that Mr. Anderson?"),
* );
*
* // Hex encoding
* console.log(encodeHex(hash));
*
* // Or with base64 encoding
* console.log(encodeBase64(hash));
* ```
*
* @module
*/
import {
DigestAlgorithm as WasmDigestAlgorithm,
digestAlgorithms as wasmDigestAlgorithms,
instantiateWasm,
} from "./_wasm/mod.ts";
import { fnv } from "./_fnv/mod.ts";
export { type WasmDigestAlgorithm, wasmDigestAlgorithms };
/**
* A copy of the global WebCrypto interface, with methods bound so they're
* safe to re-export.
*/
const 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);
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;
};
/** Extensions to the web standard `SubtleCrypto` interface. */
export interface StdSubtleCrypto extends SubtleCrypto {
/**
* Returns a new `Promise` object that will digest `data` using the specified
* `AlgorithmIdentifier`.
*/
digest(
algorithm: DigestAlgorithm,
data: BufferSource | AsyncIterable<BufferSource> | Iterable<BufferSource>,
): Promise<ArrayBuffer>;
/**
* Returns a ArrayBuffer with the result of digesting `data` using the
* specified `AlgorithmIdentifier`.
*/
digestSync(
algorithm: DigestAlgorithm,
data: BufferSource | Iterable<BufferSource>,
): ArrayBuffer;
}
/** Extensions to the Web {@linkcode Crypto} interface. */
export interface StdCrypto extends Crypto {
/** Extension to the {@linkcode crypto.SubtleCrypto} interface. */
readonly subtle: StdSubtleCrypto;
}
/**
* An wrapper for WebCrypto adding support for additional non-standard
* algorithms, but delegating to the runtime WebCrypto implementation whenever
* possible.
*/
const stdCrypto: StdCrypto = ((x) => x)({
...webCrypto,
subtle: {
...webCrypto.subtle,
/**
* Polyfills stream support until the Web Crypto API does so:
* @see {@link https://github.com/wintercg/proposal-webcrypto-streams}
*/
async digest(
algorithm: DigestAlgorithm,
data: BufferSource | AsyncIterable<BufferSource> | Iterable<BufferSource>,
): Promise<ArrayBuffer> {
const { name, length } = normalizeAlgorithm(algorithm);
assertValidDigestLength(length);
const bytes = bufferSourceBytes(data);
if (FNV_ALGORITHMS.includes(name)) {
return fnv(name, bytes);
}
// We delegate to WebCrypto whenever possible,
if (
// 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 as WasmDigestAlgorithm)) {
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 wasmCrypto = instantiateWasm();
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}`);
}
},
digestSync(
algorithm: DigestAlgorithm,
data: BufferSource | Iterable<BufferSource>,
): ArrayBuffer {
const { name, length } = normalizeAlgorithm(algorithm);
assertValidDigestLength(length);
const bytes = bufferSourceBytes(data);
if (FNV_ALGORITHMS.includes(name)) {
return fnv(name, bytes);
}
const wasmCrypto = instantiateWasm();
if (bytes) {
return wasmCrypto.digest(name, bytes, length)
.buffer;
} else if ((data as Iterable<BufferSource>)[Symbol.iterator]) {
const context = new wasmCrypto.DigestContext(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(length).buffer;
} else {
throw new TypeError(
"data must be a BufferSource or Iterable<BufferSource>",
);
}
},
},
});
const FNV_ALGORITHMS = ["FNV32", "FNV32A", "FNV64", "FNV64A"];
/** Digest algorithms supported by WebCrypto. */
const webCryptoDigestAlgorithms = [
"SHA-384",
"SHA-256",
"SHA-512",
// insecure (length-extendable and collidable):
"SHA-1",
] as const;
/** FNV (Fowler/Noll/Vo) algorithms names. */
export type FNVAlgorithms = "FNV32" | "FNV32A" | "FNV64" | "FNV64A";
/** Extended digest algorithm names. */
export type DigestAlgorithmName = WasmDigestAlgorithm | FNVAlgorithms;
/*
* The largest digest length the current WASM implementation can support. This
* is the value of `isize::MAX` on 32-bit platforms like WASM, which is the
* maximum allowed capacity of a Rust `Vec<u8>`.
*/
const MAX_DIGEST_LENGTH = 0x7FFF_FFFF;
/**
* Asserts that a number is a valid length for a digest, which must be an
* integer that fits in a Rust `Vec<u8>`, or be undefined.
*/
function assertValidDigestLength(value?: number) {
if (
value !== undefined &&
(value < 0 || value > MAX_DIGEST_LENGTH ||
!Number.isInteger(value))
) {
throw new RangeError(
`length must be an integer between 0 and ${MAX_DIGEST_LENGTH}, inclusive`,
);
}
}
/** Extended digest algorithm objects. */
export type DigestAlgorithmObject = {
name: DigestAlgorithmName;
length?: number;
};
/**
* Extended digest algorithms accepted by {@linkcode stdCrypto.subtle.digest}.
*/
export type DigestAlgorithm = DigestAlgorithmName | DigestAlgorithmObject;
function normalizeAlgorithm(algorithm: DigestAlgorithm) {
return ((typeof algorithm === "string")
? { name: algorithm.toUpperCase() }
: {
...algorithm,
name: algorithm.name.toUpperCase(),
}) as DigestAlgorithmObject;
}
export { stdCrypto as crypto };