pythonhacktoberfeststeamauthenticationauthenticatorsteam-authenticatorsteam-clientsteam-guard-codessteam-websteamworksvalvewebapi
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35 lines
1.1 KiB
35 lines
1.1 KiB
from base64 import b64decode
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from Crypto import Random
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from Crypto.Cipher import PKCS1_OAEP, AES
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from Crypto.PublicKey import RSA
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public_key = """
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MIGdMA0GCSqGSIb3DQEBAQUAA4GLADCBhwKBgQDf7BrWLBBmLBc1OhSwfFkRf53T
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2Ct64+AVzRkeRuh7h3SiGEYxqQMUeYKO6UWiSRKpI2hzic9pobFhRr3Bvr/WARvY
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gdTckPv+T1JzZsuVcNfFjrocejN1oWI0Rrtgt4Bo+hOneoo3S57G9F1fOpn5nsQ6
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6WOiu4gZKODnFMBCiQIBEQ==
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"""
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BS = AES.block_size
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pad = lambda s: s + (BS - len(s) % BS) * chr(BS - len(s) % BS)
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unpad = lambda s: s[0:-ord(s[-1])]
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def generate_session_key():
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session_key = Random.new().read(32)
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cipher = PKCS1_OAEP.new(RSA.importKey(b64decode(public_key)))
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encrypted_session_key = cipher.encrypt(session_key)
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return (session_key, encrypted_session_key)
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def encrypt(message, key):
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iv = Random.new().read(BS)
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encrypted_iv = AES.new(key, AES.MODE_ECB).encrypt(iv)
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cyphertext = AES.new(key, AES.MODE_CBC, iv).encrypt(pad(message))
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return encrypted_iv + cyphertext
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def decrypt(cyphertext, key):
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iv = AES.new(key, AES.MODE_ECB).decrypt(cyphertext[:BS])
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message = AES.new(key, AES.MODE_CBC, iv).decrypt(cyphertext[BS:])
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return unpad(message)
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