#  
**Argon2** is a cryptographic hashing algorithm specifically used to [hash](https://www.educative.io/answers/what-is-hashing) passwords. It provides better protection against password cracking than other hashing algorithms like **Bcrypt**, **Scrypt**, and **PBKDF2**.



# Variants
The `argon2` function has three variants.

1. `Argon2i` provides strong GPU resistance but has potential side-channel attacks.

2. `Argon2d` Provides strong side-channel attack resistance.
3. `Argoin2id` is the safest variant because it is a combination of the above two variants.

# Parameters
- `memory_cost`: the amount of memory in KB to be used.
- `password`: password string to be hashed.
- `salt_len`: length of random salt to be generated for each password.
- `parallelism`: Number of parallel threads.
- `time_cost`: Number of iterations over memory.
- `hash_len`: Desired length of the output.
- `type`: Argon2 variant to be used.

# Code

import argon2

argon2Hasher = argon2.PasswordHasher(
    time_cost=2, 
    memory_cost=64, 
    parallelism=1,
    hash_len=16, 
    salt_len=16,
    type = argon2.low_level.Type(2) 
)

password = "@Educative123"
 
hash = argon2Hasher.hash(password)
 
print("Hashed password: ", hash)

argon2

# Explanation
In the code above:
- Line 1: we import the python argon2 module.
- Line 3: we create an instance of the `PasswordHasher` class with custom parameters.
- Line 9: we specify a variant of the `argon2` function using the `Type` function of another `argon2` class named `low_level`. Type IDs for `argon2d`, `argon2i` and `argon2id` are 0, 1, and 2 respectively.
- Line 12: we declare the password string that we want to hash.
- Line 14: we call the `hash` function with the password string.


argon2.tar.gz

What is the Argon2 function?

Argon2 is a hashing algorithm for passwords offering better protection with three variants and customizable parameters.