如何在 Javascript 中生成与在 Python 3 中相同的 SHA256 编码字符串？

Question

I have this Python script which produces the correct output:

import hashlib

username = "LoginUser"
password = "LoginPass"
nonce = "1234567890"

def LowerCase(s): return s.lower()
def Hex(s): return ''.join([hex(char)[2:] for char in s])

def SHA1(s): h = hashlib.sha1(); h.update(s); return h.digest()
def SHA1Raw(s): h = hashlib.sha1(); h.update(s); return h.hexdigest()

def SHA256(s): h = hashlib.sha256(); h.update(s); return h.digest()
def SHA256Raw(s): h = hashlib.sha256(); h.update(s); return h.hexdigest()

def UTF8Encode(s): return str.encode(s)



step1 = SHA256((UTF8Encode(username)))
step2 = SHA1((UTF8Encode(password)))

step3 = SHA256Raw(step1 + step2)

step1 = SHA256Raw((UTF8Encode(username)))
step2 = SHA1Raw((UTF8Encode(password)))


print("""
SHA256(username={username})                            =    {step1}
SHA1(password={password})                              =    {step2}
SHA256((username + password)={username}{password})     =    {step3}
""".format(
    username = username,
    password = password,
    step1 = step1,
    step2 = step2,
    step3 = step3
))

Output:

PS D:\project> python .\test.py
SHA256(username=LoginUser)                            =    7981673b2c73a6bdb665f347dc89e9d324f542b1fa1c4a700bc523d8a9a6f565  
SHA1(password=LoginPass)                              =    df703733447469593d39a125ca93462eade53cab
SHA256((username + password)=LoginUserLoginPass)     =    cf3066e157468d6a9d59f9ff0662e4f8f8432be4e07c68320a8b6a031d0c022b

Now in Javascript, I try to mirror the functions I have in Python. I cannot for the life of me. I tried quickly understanding Buffers and streams in this context but I believe I am just confusing myself further by not staying grounded to something.

Anyways here's the Javascript versiona and it's output:

const crypto = require('crypto')

const username = "LoginUser"
const password = "LoginPass"
const nonce = "1234567890"

const LowerCase = s => s.toLowerCase()
const Hex = s => Buffer.from(s, 'utf8').toString('hex')

const SHA1 = s => crypto.createHash('sha1').update(s, 'utf8').digest('hex')
const SHA1Raw = s => crypto.createHash('sha1').update(s, 'utf8').digest()

const SHA256 = s => crypto.createHash('sha256').update(s, 'utf8').digest('hex')
const SHA256Raw = s => crypto.createHash('sha256').update(s, 'utf8').digest()

const UTF8Encode = s => Buffer.from(s, 'utf8');


let step1 = SHA256(username)
let step2 = SHA1(password)
let step3 = SHA256Raw(step1.concat(step2))

console.log(`
SHA256(username=${username})                            =    ${step1}
SHA1(password=${password})                              =    ${step2}
SHA256((username + password)=${username+password})      =    ${step3.toString('hex')}
`)

Output:

PS D:\project> node .\test.js


SHA256(username=LoginUser)                            =    7981673b2c73a6bdb665f347dc89e9d324f542b1fa1c4a700bc523d8a9a6f565
SHA1(password=LoginPass)                              =    df703733447469593d39a125ca93462eade53cab
SHA256((username + password)=LoginUserLoginPass)      =    757101f0fd2628ce12dc039146f56da14a1e85a27fda5d68c2623f616c4fc3cc

Can anyone help?

Answer 1

You only need a very small modification to make this work in Node.js.

I would suggest calculating the hashes as buffer objects, this makes the combined hash easier to calculate (since we don't need to parse from hex).

We do this by using Buffer.concat to concatenate the output of the previous hashes.

const crypto = require('crypto')

const username = "LoginUser"
const password = "LoginPass"
const nonce = "1234567890"

const LowerCase = s => s.toLowerCase()
const Hex = s => Buffer.from(s, 'utf8').toString('hex')

const SHA1 = s => crypto.createHash('sha1').update(s, 'utf8').digest('hex')
const SHA1Raw = s => crypto.createHash('sha1').update(s, 'utf8').digest()

const SHA256 = s => crypto.createHash('sha256').update(s, 'utf8').digest('hex')
const SHA256Raw = s => crypto.createHash('sha256').update(s, 'utf8').digest()

const UTF8Encode = s => Buffer.from(s, 'utf8');


let step1 = SHA256Raw(username) // Get the SHA256 as a buffer.
let step2 = SHA1Raw(password) // Get the SHA1 as a buffer.
let step3 = SHA256Raw(Buffer.concat([step1, step2])) // Get the SHA256 of the previous steps concatenated as a buffer.

console.log(`
SHA256(username=${username})                            =    ${step1.toString('hex')}
SHA1(password=${password})                              =    ${step2.toString('hex')}
SHA256((username + password)=${username+password})      =    ${step3.toString('hex')}
`)

This gives the correct result, eg

SHA256(username=LoginUser)                            =    7981673b2c73a6bdb665f347dc89e9d324f542b1fa1c4a700bc523d8a9a6f565
SHA1(password=LoginPass)                              =    df703733447469593d39a125ca93462eade53cab
SHA256((username + password)=LoginUserLoginPass)      =    cf3066e157468d6a9d59f9ff0662e4f8f8432be4e07c68320a8b6a031d0c022b