MyCrptool
A python package that include commonly used cryptographic algorithm and tools.
Install
pip install mycrptool
Dependencies
Here are external libraries that is used in this package.
bitarray
Usage
This package consists of 4 parts: symmetric, asymetric, hash, and tools.
To import all modules, it is recommanded to run from mycryptool import *
symmetric
This module includes 2 symmetric algorithms: AES128 and DES.
AES128
The Default scheme is CBC. if you want to try other schemes, welcome to explore the AES class (in symmetric.aes128).
Encrypt:
data = b'Jessie Pinkman in the house'
key = 'key'
cipher = symmetric.aes128.encrypt(key, data)
Decrypt:
symmetric.aes128.decrypt(key, cipher)
DES
DES only supports 2 schemes: CBC and ECB. Supported Features: encrypt and decrypt.
Encrypt:
key = b'chopperc'
iv = b'66666666'
data = b'Yo Yo Yo, Jessie Pinkman in the house!!!'
cipher = symmetric.des.des_cbc(data, iv, key, True) # CBC
cipher = symmetric.des.des_ecb(data, key, True) # ECBDecrypt:
deciphered = symmetric.des.des_cbc(cipher, iv, key, False) # CBC
deciphered = symmetric.des.des_ecb(cipher, key, False) # ECBasymmetric
This module includes 2 asymmetric algorithms: RSA and Elliptic Curve.
Supported Features: encrypt, decrypt, generate signature, and validate signature.
RSA
Encrypt:
data = b'Jessie Pinkman in the house'
# Warning: it takes a while to generate key pairs ( large prime numbers).
pub, pri = asymmetric.rsa.generate_key_pair()
cipher = asymmetric.rsa.encrypt(data, pub)Decrypt:
asymmetric.rsa.decrypt(cipher, pri)Generate signature:
signature = asymmetric.rsa.get_signature(hash.md5.md5(data), pri)
print(signature)Validate signature:
asymmetric.rsa.is_valid_signature(hash.md5.md5(data), signature, pub)Elliptic Curve
As for now, this module only supports 1 curve: ecp256k1.
However, you can Implement your own curve derived from the EllipticCurve class.
Implement customize curve:
class ecp256k1(EllipticCurve):
# ecp256k1 https://www.secg.org/sec2-v2.pdf
def __init__(self):
a = 0
b = 7
p = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F
Gx = 0x79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798
Gy = 0x483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8
n = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141
super(ecp256k1, self).__init__(a, b, p, (Gx, Gy), n)Encrypt:
ec = asymmetric.elliptic_curve.ecp256k1()
pri = ec.get_private_key()
pub = ec.get_public_key(pri)
ec_cipher = ec.encrypt(data, pub)
print(ec_cipher)Decrypt:
ec.decrypt(ec_cipher, pri)Generate signature:
signature = ec.get_signature(hash.sha1.sha1(data), pri)Validate signature:
ec.is_valid_signature(hash.sha1.sha1(data), signature, pub)
