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Noir FNV Hashing

The goal of this assignment is to learn the basics of Noir by implementing FNV hashing.

FNV (Fowler-Noll-Vo) hashing is a family of non-cryptographic hash functions that are designed to be fast and efficient while producing a relatively good distribution of hash values.

The FNV hash algorithm operates on a byte sequence and produces a hash value. It starts with an initial value, usually a prime number, and then processes each byte of the input data, updating the hash value using a simple multiplication and XOR operation.

The basic implementation of an FNV algorithm in python is given below:

def fnv_hash(data):
    size = 2**32
    hash_value = 0x811C9DC5
    prime = 0x1000193

    for byte in data:
        product = (hash_value * prime) % size
        hash_value = (product ^ byte)

    return hash_value

The function when given a value of 0x079A6F9C returns the hashed value 0x71233de7. Your goal for this assignment is to implement this in Noir. Use the same values of size, initial value and prime number.

Evaluation

  • Create a fork of this repo

  • Clone the forked repo. You can use the following command after replacing the CLONE_URL with the clone url of your repo

    git clone CLONE_URL

  • Go to your forked repo and under Actions make sure that github actions on forked repo are enabled.

  • Make changes to the src/main.nr file. Add your hashing logic to calculate_hash function. The function should take in a value and return its hash.

  • Run Tests

    nargo test

  • Push your changes to main branch of your forked repo.

  • Submit your name, email and link to your forked repo here.

Reference