gcm diff

const gcm = require('node-aes-gcm')

const key = new Buffer([0xfe,0xff,0xe9,0x92,0x86,0x65,0x73,0x1c,0x6d,0x6a,0x8f,0x94,0x67,0x30,0x83,0x08])
const iv = new Buffer([0xca,0xfe,0xba,0xbe,0xfa,0xce,0xdb,0xad,0xde,0xca,0xf8,0x88])

const plaintext1 = `
    quicksort [] = []
    quicksort (x:xs) = quicksort small ++ (x : quicksort large)
      where small = [y | y <- xs, y <= x]
            large = [y | y <- xs, y > x]
`

const plaintext2 = `
    quicksort [] = []
    quicksort (x:xs) = quicksort small ++ (x : quicksort large)
      where small = [y | y <- xs, x >= y]
            large = [y | y <- xs, y > x]
`

const result1 = gcm.encrypt(key, iv, new Buffer(plaintext1), new Buffer([]))
const result2 = gcm.encrypt(key, iv, new Buffer(plaintext2), new Buffer([]))

console.log(result1, result2)

const ciphertext1 = result1.ciphertext.toString('base64')
const ciphertext2 = result2.ciphertext.toString('base64')

const chunkSize = 16

for(var i = 0; i < ciphertext1.length; i += chunkSize) {
    const chunk1 = ciphertext1.slice(i, i+chunkSize)
    const chunk2 = ciphertext2.slice(i, i+chunkSize)
    if(chunk1 == chunk2){
        console.log(`${i/chunkSize} ${chunk1} => ${chunk2}`)
    } else {
        console.log(`${i/chunkSize} ${chunk1} => ${chunk2} changed!!!`)
    }
}