Digital signatures are created by using hash algos like md4/5 or sha(1) (prefered) and public and private keys.
In order to create digital signatures which are accepted by the server you will have to know the private key which is used in order to create the signature. If you know it, you will be able to create "fake" signatures which are accepted by the server.
However, if the guys implemented the algo correctly, there's no way to use a "generic" signature or something smilar.
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