hashString

1/**
2 * Hashes a string using the specified algorithm (e.g., SHA-1, SHA-256, SHA-512).
3 * Returns a hexadecimal string representation.
4 *
5 * @param input - The input string to hash.
6 * @param algorithm - Hashing algorithm (default is 'SHA-256').
7 * @returns A promise resolving to the hex hash string.
8 */
9export async function hashString(
10  input: string,
11  algorithm: AlgorithmIdentifier = 'SHA-256'
12): Promise<string> {
13  const encoder = new TextEncoder();
14  const data = encoder.encode(input);
15  const hashBuffer = await crypto.subtle.digest(algorithm, data);
16  return Array.from(new Uint8Array(hashBuffer))
17    .map(b => b.toString(16).padStart(2, '0'))
18    .join('');
19}

1test('hashString - SHA-256 hash of "hello"', async () => {
2  const hash = await hashString('hello', 'SHA-256');
3  expect(hash).toBe(
4    '2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824'
5  );
6});
7
8test('hashString - SHA-1 hash of "hello"', async () => {
9  const hash = await hashString('hello', 'SHA-1');
10  expect(hash).toBe('aaf4c61ddcc5e8a2dabede0f3b482cd9aea9434d');
11});
12
13test('hashString - SHA-512 hash of "hello"', async () => {
14  const hash = await hashString('hello', 'SHA-512');
15  expect(hash.startsWith('9b71d224')).toBe(true); // just checking prefix
16  expect(hash.length).toBe(128);
17});
18
19test('hashString - empty string returns known hash', async () => {
20  const hash = await hashString('');
21  expect(hash).toBe(
22    'e3b0c44298fc1c149afbf4c8996fb924' +
23    '27ae41e4649b934ca495991b7852b855'
24  );
25});