'Hashing, Salting, and Verifying Passwords in NodeJS, Python, Golang, and Java' authentication authorization
Since the computed hash + salt doesn’t match the one in the database, we reject this password. If Alice was to enter her correct password , it would indeed generate the same hash + salt as the one in the database, verifying her identity.
Even after salting, the issue of brute force attacks still remains. An attacker could repeatedly guess different passwords to see which one matches the leaked hash. There are two dimensions that determine how quickly an attacker can find a match:The time it takes for the hash function to compute the hash If a user uses a random and long enough password, the chances of the attacker guessing that exact string reduces. This means they have to crunch through more guesses which will take more time.The slower and more computationally expensive the hashing function, the more time it would take to validate each guess. As of this writing , the recommended hashing technique is to usewith a minimum configuration of 15 MiB of memory, an iteration count of 2, and 1 degree of parallelism. As computational power increases, recommended hashing techniques change as well. Even if the algorithm remains the same, the recommended number of “rounds” / amount of “work” that should be done per password hash may increase.import * as argon2 from "argon2"; import * as crypto from "crypto"; const hashingConfig={ // based on OWASP cheat sheet recommendations parallelism: 1, memoryCost: 64000, // 64 mb timeCost: 3 // number of itetations } async function hashPassword { let salt=crypto.randomBytes; return await argon2.hash } async function verifyPasswordWithHash { return await argon2.verify; } hashPassword.then=>{ console.log console.log); });Hash + salt of the password: $argon2i$v=19$m=15000,t=3,p=1$tgSmiYOCjQ0im5U6NXEvPg$xKC4V31JqIK2XO91fnMCfevATq1rVDjIRX0cf/dnbKY Password verification success: true If you run the above program, it will produce a different hash each time since the salt is regenerated each time.package main import type params struct { memory uint32 iterations uint32 parallelism uint8 saltLength uint32 keyLength uint32 } func main { p :=¶ms{ memory: 64 * 1024, // 64 MB iterations: 3, parallelism: 1, saltLength: 16, keyLength: 32, } encodedHash, err :=generateHashFromPassword if err !=nil { log.Fatal } fmt.Println fmt.Println match, err :=verifyPassword if err !=nil { log.Fatal } fmt.Printf } func generateHashFromPassword { salt, err :=generateRandomBytes if err !=nil { return "", err } hash :=argon2.IDKey, salt, p.iterations, p.memory, p.parallelism, p.keyLength) // Base64 encode the salt and hashed password. b64Salt :=base64.RawStdEncoding.EncodeToString b64Hash :=base64.RawStdEncoding.EncodeToString // Return a string using the standard encoded hash representation. encodedHash=fmt.Sprintf return encodedHash, nil } func generateRandomBytes { b :=make _, err :=rand.Read if err !=nil { return nil, err } return b, nil } func verifyPassword { // Extract the parameters, salt and derived key from the encoded password // hash. p, salt, hash, err :=decodeHash if err !=nil { return false, err } // Derive the key from the other password using the same parameters. otherHash :=argon2.IDKey, salt, p.iterations, p.memory, p.parallelism, p.keyLength) // Check that the contents of the hashed passwords are identical. Note // that we are using the subtle.ConstantTimeCompare function for this // to help prevent timing attacks. if subtle.ConstantTimeCompare==1 { return true, nil } return false, nil } func decodeHash { vals :=strings.Split if len !=6 { return nil, nil, nil, errors.New } var version int _, err=fmt.Sscanf if err !=nil { return nil, nil, nil, err } if version !=argon2.Version { return nil, nil, nil, errors.New } p=¶ms{} _, err=fmt.Sscanf if err !=nil { return nil, nil, nil, err } salt, err=base64.RawStdEncoding.Strict.DecodeString if err !=nil { return nil, nil, nil, err } p.saltLength=uint32) hash, err=base64.RawStdEncoding.Strict.DecodeString if err !=nil { return nil, nil, nil, err } p.keyLength=uint32) return p, salt, hash, nil }import argon2 argon2Hasher=argon2.PasswordHasher password="somePassword" hash=argon2Hasher.hash print verifyValid=argon2Hasher.verify printimport de.mkammerer.argon2.Argon2; import de.mkammerer.argon2.Argon2Factory; public class PasswordHashing { public static void main { // salt 32 bytes // Hash length 64 bytes Argon2 argon2=Argon2Factory.create; char[] password="somePassword".toCharArray; String hash=argon2.hash; System.out.println; System.out.println); } }Unless they are stored in a "secure vault" like this one. But then too, it’s still possible that they get leaked."5994471abb01112afcc18159f6cc74b4f511b99806da59b3caf5a9c173cacfc5", it would work since the algorithm is just matching the computed hash against the one in the database.
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