# sha1

Digests bytes with Web Crypto SHA-1 and returns a fresh Uint8Array.

## Signatures

```ts
export declare const sha1: (data: BufferSource) => Effect.Effect<Uint8Array<ArrayBuffer>, never, never>;
```

## Why

This published low-level helper exposes the exact hash required by UUID version 5; SHA-1 here is identity derivation, not password or signature security. Missing Web Crypto and rejected `subtle.digest` promises are Effect defects because the typed error channel is `never`.

## Ownership and lifetime

Each Effect owns one asynchronous Web Crypto request and transfers a fresh result buffer; it retains no input after completion.

## Examples

```ts
import { sha1 } from "@typed/id/_sha"
import { Effect } from "effect"
const digest = Effect.runPromise(sha1(new TextEncoder().encode("name")))
```