Cryptographic Algorithms in PyDataStructs

[czgdp1807]

Let's create a fake example (assume that cryptographic algorithms are already there in pydatastructs)

from pydatastructs import crypto

text = "Hello world!"
encrypted_text = crypto.sha256(text, encrypt=True)
decrypted_text = crypto.sha256(text, decrypt=True)
assert(text == decrytpted_text)
print("Encrypted text: ", encrypted_text)

Another example,

from pydatastructs import crypto

text = "Hi there!"
encrypted_text = crypto.sha256(text, key=key, encrypt=True)

Another case is we can have two functions, sha256_encrypt or sha256_decrypt. sha256 with encrypt and decrypt is a bit risky because if by chance we pass incorrect value to encrypt or decrypt then it can mess things up.

sha256_encrypt and sha256_decrypt.

For ChaCha20,

def chacha20(key, nonce, counter):
   ...

or,

def chacha20(key):
    ...
    # nonce and counter will be generated here

1. Fixing bugs - that is easy, doesn't involve
2. Adding a new feature - a cryptographic algorithm, a sorting algorithm - figure out how the function signature would look like. sort(list), sort(array), sort(set), sort(iterator), sort(list, reverse=True),

def sort(obj, reverse=False):
    ...

@Susmita331

[ahmed0-07]

is this an issue to work with or it is related to @Susmita331?

[CrapTheCoder]

Hey, I'd love to start working on this issue. Can I go ahead? @czgdp1807

[pvprajwal]

Hi, I would like to work on this @czgdp1807. I presume crypto should come under string algorithms. I'll work on implementing SHA256 and ChaCha20-Poly1305.

Also I'm not sure how sha256 can be decrypted since its a hashing algorithm.