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20f83d9 | 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 | /**
* FNV-1a 52-bit hash — fast, non-cryptographic.
*
* WARNING: Do NOT use for cache keys derived from attacker-controlled input.
* Use sha256Hex() instead for any server-side cache key with user input.
* Retained for client-side non-security contexts (e.g. vector-db dedup).
*/
export function hashString(input: string): string {
let h = 0xcbf29ce484222325n;
const FNV_PRIME = 0x100000001b3n;
const MASK_52 = (1n << 52n) - 1n;
for (let i = 0; i < input.length; i++) {
h ^= BigInt(input.charCodeAt(i));
h = (h * FNV_PRIME) & MASK_52;
}
return Number(h).toString(36);
}
/**
* SHA-256 hex digest via Web Crypto (available in Edge/Vercel/Node 18+).
* Use for all server-side cache keys derived from user-controlled input.
*/
export async function sha256Hex(input: string): Promise<string> {
const buf = await crypto.subtle.digest(
'SHA-256',
new TextEncoder().encode(input),
);
return Array.from(new Uint8Array(buf))
.map(b => b.toString(16).padStart(2, '0'))
.join('');
}
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