Cách Kiểm Tra Tính Toàn Vẹn File Sau Khi Tải Xuống (Hướng Dẫn Checksum)

# Compute SHA-256
shasum -a 256 sample-10mb.pdf

# Compute MD5
md5 sample-10mb.pdf

# Compute SHA-256
sha256sum sample-10mb.pdf

# Verify against a checksums.txt file
sha256sum -c checksums.txt

# Compute SHA-256
Get-FileHash .\sample-10mb.pdf -Algorithm SHA256

# Compute MD5
Get-FileHash .\sample-10mb.pdf -Algorithm MD5

import fs from 'fs';
import crypto from 'crypto';

export async function verifyDownloadedFile(
  filePath: string,
  expectedChecksum: string,
  algorithm = 'sha256'
): Promise<boolean> {
  const hash = crypto.createHash(algorithm);
  const stream = fs.createReadStream(filePath);

  for await (const chunk of stream) {
    hash.update(chunk);
  }

  const actualChecksum = hash.digest('hex').toLowerCase();
  const matches = actualChecksum === expectedChecksum.toLowerCase();

  if (!matches) {
    console.error(`Integrity mismatch! Expected: ${expectedChecksum}, got: ${actualChecksum}`);
  }

  return matches;
}