![]() ![]() Then if you choose a higher iteration count you could just update your protocol version. Using SHA-256 with NodeJS Crypto Ask Question Asked 8 years, 6 months ago Modified 3 months ago Viewed 193k times 131 I'm trying to hash a variable in NodeJS like so: var crypto require ('crypto') var hash crypto.createHash ('sha256') var code 'bacon' code hash.update (code) code hash.digest (code) console. You could even use that to replace the salt size, iterations, hash type etc. I was afraid that you were implementing PBKDF2 yourself, but you seem to be correctly using the proper crypto calls.Ī different idea of handling this (for you to ponder over).ĭefine your protocol somewhere and store a protocol version in your hash string. salt before hash) - storing the hash last makes most sense to me. You could use just a counter to retrieve the various parts after split, and at least create the variables in order (e.g. ![]() As there are no checks on the results after the split, the hash string representation could be altered without notice (impact depends on how the code is used).Calling split multiple times is not a good idea, call it once and store the intermediate result.Compared to PBKDF2 almost nothing takes a lot of time. hash = om(hash, 'hex') part ( timingSafeEqual only accepts buffer). If you use it as a (encryption) key then you should avoid text, as it can be hard to destroy the result. The node:crypto module provides cryptographic functionality that includes a set of wrappers for OpenSSLs hash, HMAC, cipher, decipher, sign, and verify. Yes, that's OK, if you use this to store password hashes. Here I am giving a full implementation of the bcrypt verification using the NodeJS api and fetching the password from the MySQL. Verify One-Way Hashed Passwords Using NodeJS API. So the old hash and new hash do not match if you use the equal() operator. Is using text ok, or should I use and save buffer for this? Why because the bcrypt will generate a different hash for the same password each time.hash = om(hash, 'hex') part (that's because timingSafeEqual only accepts buffer). I have to convert from text back in Buffer in the verifyPassword.Is it ok if I save the combined from the hashPassword as text in.This works, but, here is what bothers me : Let equals = crypto.timingSafeEqual(hash, verify) ![]() (stack : node 8.11.1 + express 4.16.3 + PostgreSQL 10) const crypto = require('crypto') Since the same process is always applied, the same input always yields the same output. No matter the size of the original string (i.e., the plain text password), the output (the hash) is always the same length. I wrote the following functions, based on various examples and the aforementioned APIs and functions. The hash algorithm takes in a string of any size and outputs a fixed-length string. I use the pbkdf2 and the randomBytes for salting, and the timingSafeEqual to check for the password validity when logging in. Really though, you should just compare the hashes as hex, since it is already a string representation of a binary value, and it's easier to read than improperly decoded unicode characters.I use the native crypto. in this case being a way to write binary values to the terminal, rather than strings. If you wish to directly compare the binary values as actual decoded values in a terminal, you need to give the equivalent instructions in both languages. But the buffer is binary data, not UTF-8 encoded data, so it will fail to decode your data into a string, causing garbled results. ![]() The second however, says something very different, convert this array of bytes into a string, and then write that string to the terminal. The Python code says, write this array of bytes to the terminal. So then compare your examples of printing the output, shortened for readability print '\xbax\x16\xbf\x8f\x01\xcf\xeaAA' Python supports Unicode using a separate string class designated by u''. Node does not return a string, because strings in Node are not arrays of single-byte characters, but arrays of UTF-16 code units. The value in Node however, is stored as a Buffer, which actually represents an array of values (0-255) as well. In Python, strings are simply arrays of chars (0-255) values. In this case, the core thing to notice is that the result in Python is returned as a string. This is the string representation of the bytes you get after hashing Its Nodejs Equivalent was as simple as. When considering the final binary output, your examples both output the same values. def HmacSha256 (key, sign): return hmac.new (key, sign, hashlib.sha256).digest () hash HmacSha256 ('\0'32, rawMsg) print hash. The difference is in how the languages treat their binary data and string types. Your node code is trying to parse the result of the hash as utf8 and failing. ![]()
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