digest.ts

var IDX = 256, HEX: string[] = [];
while (IDX--) HEX[IDX] = (IDX + 256).toString(16).substring(1);

/**
 * @param algorithm only "SHA-1", "SHA-256", "SHA-384", "SHA-512".
 *
 * **Note**: "SHA-1" is not recommended.
 */
export async function digestHex(algorithm: AlgorithmIdentifier, data: string | BufferSource): Promise<string> {
  if (typeof data === "string") data = new TextEncoder().encode(data);
  var buf = await crypto.subtle.digest(algorithm, data);
  var ary = new Uint8Array(buf), str = '', len = ary.length;
  for (var i = 0; i < len; ++i) str += HEX[ary[i]];
  return str;
}

// digestHex('SHA-1', 'hello world').then(console.log)