def encryptRSAWithOAEP(message):
global K0,K1,N,e,n
valueMessage = long(message, 16)
r = random.randrange(1 << (K0-1), (1 << K0) - 1)
keccak = sha.sha3_384(hex(r))
Gr = long(keccak.hexdigest(), 16) # 384 bits
X = (valueMessage << K1) ^ Gr
keccak = sha.sha3_256(hex(X))
Hx = long(keccak.hexdigest(), 16) # 256 bits
Y = r ^ Hx
res = (X << K0) + Y
# RSA encryption
encrypt = pow(res, e, n)
return encrypt
def decryptRSAWithOAEP(encrypt):
global K0,K1,N,d,n
# RSA decryption
encryptValue = pow(encrypt, d, n)
Y = encryptValue % (1 << K0)
X = encryptValue >> K0
keccak = sha.sha3_256(hex(X))
Hx = long(keccak.hexdigest(), 16) # 256 bits
r = Y ^ Hx
keccak = sha.sha3_384(hex(r))
Gr = long(keccak.hexdigest(), 16) # 384 bits
message = X ^ Gr
message >>= K1
return hex(message)