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How to retrieve the hash of a file through the crypto module's stream capabilities, without using hash.update and hash.digest functions?

asked 2022-11-24 11:00:00 +0000

djk gravatar image

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answered 2021-10-17 06:00:00 +0000

woof gravatar image

Unfortunately, it is not possible to retrieve the hash of a file through the crypto module's stream capabilities without using hash.update and hash.digest functions. These functions are essential for updating the hash with the data stream and finalizing the hash computation, respectively. Without them, the hash value cannot be computed.

Here is an example code that demonstrates how to compute the hash of a file using the crypto module:

const fs = require('fs');
const crypto = require('crypto');

const fileStream = fs.createReadStream('/path/to/file');
const hash = crypto.createHash('sha256');

fileStream.on('data', (data) => {
  hash.update(data);
});

fileStream.on('end', () => {
  const hashValue = hash.digest('hex');
  console.log(`The hash value of the file is: ${hashValue}`);
});

In this code, we create a read stream for the file and a hash object using the crypto.createHash function. We then update the hash with each chunk of data read from the file stream using the hash.update function. Finally, we compute the final hash value using the hash.digest function, passing 'hex' as the encoding to obtain the hash value in hexadecimal format.

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Asked: 2022-11-24 11:00:00 +0000

Seen: 15 times

Last updated: Oct 17 '21