如何使用Javascript或Flash获取用户文件的哈希值？

// 获取用户上传的文件
const fileInput = document.querySelector('input[type="file"]');
fileInput.addEventListener('change', async (event) => {
  const file = event.target.files[0];
  const hash = await getFileHash(file);
  console.log(`文件哈希值：${hash}`);
});

// 计算文件哈希值的函数
async function getFileHash(file) {
  const reader = new FileReader();
  const data = await new Promise((resolve, reject) => {
    reader.onload = () => resolve(reader.result);
    reader.onerror = (error) => reject(error);
    reader.readAsArrayBuffer(file);
  });

  const buffer = new Uint8Array(data);
  const hashBuffer = await crypto.subtle.digest('SHA-256', buffer);
  const hashArray = Array.from(new Uint8Array(hashBuffer));
  const hashHex = hashArray.map((b) => b.toString(16).padStart(2, '0')).join('');
  return hashHex;
}

import flash.filesystem.File;
import flash.utils.ByteArray;
import flash.crypto.SHA256;

// 获取用户上传的文件
const file:File = File.documentsDirectory.resolvePath("path/to/your/file");
const hash:String = getFileHash(file);
trace("文件哈希值：" + hash);

// 计算文件哈希值的函数
function getFileHash(file:File):String {
  const fileStream:FileStream = new FileStream();
  fileStream.open(file, FileMode.READ);
  const data:ByteArray = new ByteArray();
  fileStream.readBytes(data);
  fileStream.close();

  const sha256:SHA256 = new SHA256();
  sha256.update(data);
  const hash:ByteArray = sha256.finalize();
  return hash.toString(16);
}