Guide to creating a cryptosystem using a Synchronous Stream Cipher with Vue js

Question

Guide to creating a cryptosystem using a Synchronous Stream Cipher with Vue js

I am currently working with a pseudo-random number generator that creates binary numbers using a user-supplied polynomial and the LFSR method. To enhance the process, I need to convert a loaded file into binary format so that I can apply the XOR operation between each bit of the loaded data and the generated key. However, I am struggling with the conversion process and how to set it up in a way that allows for seamless XOR operations. The only solution I have come across so far is to use the

input type="file" @change="onFileSelected"/>

to load the file. Any guidance or insights from the community would be greatly appreciated.

javascript vue.js cryptography

Answer 1

Answer №1

If you are using a function called getKeyBit() that retrieves a single bit from a key, you can utilize the following code:

const getKeyByte = () => {
  const byte = []

  // Obtaining 8 key bits
  for (let i = 0; i < 8; ++i) {
    byte.push(getKeyBit())
  }

  // Convert the byte string to base 2
  return parseInt(byte.join(''), 2)
}

const encryptFile = (file) => {
  const fileReader = new FileReader()
  fileReader.readAsArrayBuffer(file)

  return new Promise(resolve => {
    fileReader.onload = () => {
      const buffer = new Uint8Array(fileReader.result)
    
      // Resolve the promise with mapped Uint8Array
      resolve(buffer.map(byte => {
        // Perform XOR operation on each byte with a byte from the key 
        return byte ^ getKeyByte()
      }))
    } 
  })
}

Remember to use await when calling the function:

const encrypted = await encryptFile(file)

Answer 2

If you are using a function called getKeyBit() that retrieves a single bit from a key, you can utilize the following code:

const getKeyByte = () => {
  const byte = []

  // Obtaining 8 key bits
  for (let i = 0; i < 8; ++i) {
    byte.push(getKeyBit())
  }

  // Convert the byte string to base 2
  return parseInt(byte.join(''), 2)
}

const encryptFile = (file) => {
  const fileReader = new FileReader()
  fileReader.readAsArrayBuffer(file)

  return new Promise(resolve => {
    fileReader.onload = () => {
      const buffer = new Uint8Array(fileReader.result)
    
      // Resolve the promise with mapped Uint8Array
      resolve(buffer.map(byte => {
        // Perform XOR operation on each byte with a byte from the key 
        return byte ^ getKeyByte()
      }))
    } 
  })
}

Remember to use await when calling the function:

const encrypted = await encryptFile(file)

Guide to creating a cryptosystem using a Synchronous Stream Cipher with Vue js

Answer №1

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