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| # rc4 encryption | |
| # modified from source: https://github.com/bozhu/RC4-Python/blob/master/rc4.py | |
| import sys | |
| def crypt(key, data): | |
| S = list(range(256)) | |
| j = 0 | |
| for i in list(range(256)): | |
| j = (j + S[i] + ord(key[i % len(key)])) % 256 | |
| S[i], S[j] = S[j], S[i] | |
| j = 0 | |
| y = 0 | |
| out = [] | |
| for char in data: | |
| j = (j + 1) % 256 | |
| y = (y + S[j]) % 256 | |
| S[j], S[y] = S[y], S[j] | |
| if version == 2: | |
| out.append(unichr(ord(char) ^ S[(S[j] + S[y]) % 256])) | |
| if version == 3: | |
| out.append(chr(ord(char) ^ S[(S[j] + S[y]) % 256])) | |
| return ''.join(out) | |
| if __name__ == '__main__': | |
| if sys.version_info.major == 2: | |
| version = 2 | |
| else: | |
| version = 3 | |
| plain = 'this is plaintext data' | |
| key = 'this is a super complex key' | |
| # testing encryption | |
| encrypted = crypt(key, plain) | |
| print('encrypted: ' + encrypted) | |
| print(type(encrypted)) | |
| # testing decryption | |
| decrypted = crypt(key, encrypted) | |
| print('decrypted: ' + decrypted) | |
| print(type(decrypted)) |
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