function createHash
Usage in Deno
```typescript import { createHash } from "node:node__crypto.d.ts"; ```
createHash(algorithm: string,options?: HashOptions,): Hash
Creates and returns a `Hash` object that can be used to generate hash digests
using the given `algorithm`. Optional `options` argument controls stream
behavior. For XOF hash functions such as `'shake256'`, the `outputLength` option
can be used to specify the desired output length in bytes.
The `algorithm` is dependent on the available algorithms supported by the
version of OpenSSL on the platform. Examples are `'sha256'`, `'sha512'`, etc.
On recent releases of OpenSSL, `openssl list -digest-algorithms` will
display the available digest algorithms.
Example: generating the sha256 sum of a file
```js
import {
createReadStream,
} from 'node:fs';
import { argv } from 'node:process';
const {
createHash,
} = await import('node:crypto');
const filename = argv[2];
const hash = createHash('sha256');
const input = createReadStream(filename);
input.on('readable', () => {
// Only one element is going to be produced by the
// hash stream.
const data = input.read();
if (data)
hash.update(data);
else {
console.log(`${hash.digest('hex')} ${filename}`);
}
});
```
optional
options: HashOptions
`stream.transform` options