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organize hash algorithm names

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Nebel 2024-09-09 18:32:50 +09:00
parent 9561fb23dc
commit 5c5d171791
Signed by: nebel
GPG key ID: 79807D08C6EF6460
1 changed files with 10 additions and 18 deletions
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28
src/index.ts
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@ -1,17 +1,12 @@
/** Content Security Policy Level 2, section 4.2 */
export type HashAlgorithm = "sha256" | "sha384" | "sha512";
export const supportedHashAlgorithm: ReadonlyArray<HashAlgorithm> = [
"sha512",
"sha384",
"sha256",
];
export const supportedHashAlgorithmName = {
/** Supported Hash Algorithms */
export const supportedHashAlgorithms = {
sha256: "SHA-256",
sha384: "SHA-384",
sha512: "SHA-512",
} satisfies Record<HashAlgorithm, string>;
} as const satisfies Record<HashAlgorithm, HashAlgorithmIdentifier>;
export type PrioritizedHashAlgorithm = "" | HashAlgorithm;
@ -20,8 +15,8 @@ export function getPrioritizedHashAlgorithm(
b: HashAlgorithm,
): PrioritizedHashAlgorithm {
if (a === b) return "";
if (!supportedHashAlgorithm.includes(a)) return "";
if (!supportedHashAlgorithm.includes(b)) return "";
if (!(a in supportedHashAlgorithms)) return "";
if (!(b in supportedHashAlgorithms)) return "";
return a < b ? b : a;
}
@ -69,7 +64,7 @@ export class IntegrityMetadata {
}): string {
if (!integrity.alg) return "";
if (!integrity.val) return "";
if (!supportedHashAlgorithm.includes(integrity.alg)) return "";
if (!(integrity.alg in supportedHashAlgorithms)) return "";
return `${integrity.alg}-${[integrity.val, ...integrity.opt].join("?")}`;
}
}
@ -81,13 +76,10 @@ export async function createIntegrityMetadata(
): Promise<string> {
const alg = hashAlgorithm.toLowerCase() as HashAlgorithm;
if (!supportedHashAlgorithm.includes(alg)) return "";
const arrayBuffer = await crypto.subtle.digest(
supportedHashAlgorithmName[alg],
data,
);
if (!(alg in supportedHashAlgorithms)) return "";
const hashAlgorithmIdentifier = supportedHashAlgorithms[alg];
const arrayBuffer = await crypto.subtle.digest(hashAlgorithmIdentifier, data);
const val = btoa(String.fromCharCode(...new Uint8Array(arrayBuffer)));
return IntegrityMetadata.stringify({
@ -124,7 +116,7 @@ export class IntegrityMetadataSet extends Map<
}
get strongest(): IntegrityMetadata {
const [hashAlgorithm = supportedHashAlgorithm[0]]: HashAlgorithm[] = [
const [hashAlgorithm = "sha512"]: ReadonlyArray<HashAlgorithm> = [
...this.keys(),
].sort((a, b) => {
switch (this.getPrioritizedHashAlgorithm(a, b)) {