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def sign_data(private_key_loc, data):
    '''
    param: private_key_loc Path to your private key
    param: package Data to be signed
    return: base64 encoded signature
    '''
    from Crypto.PublicKey import RSA 
    from Crypto.Signature import PKCS1_v1_5 
    from Crypto.Hash import SHA256 
    from base64 import b64encode, b64decode