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def generate_RSA(bits=2048):
'''
Generate an RSA keypair with an exponent of 65537 in PEM format
param: bits The key length in bits
Return private key and public key
'''
from Crypto.PublicKey import RSA
new_key = RSA.generate(bits, e=65537)
public_key = new_key.publickey().exportKey("PEM")
private_key = new_key.exportKey("PEM")