C++ implement SessionCrypter or SessionEncrypter/Decrypter

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C++ is missing the unsigned session encrypter present in java, python, c# and 
go.

Original issue reported on code.google.com by jtu...@gmail.com on 15 Mar 2013 at 6:20

• Blocking: #116

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Original comment by jtu...@gmail.com on 15 Mar 2013 at 6:22

• Added labels: Implementation-Cpp

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Original comment by jtu...@gmail.com on 15 Mar 2013 at 6:23

• Now blocking: #116

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Original comment by jtu...@gmail.com on 4 Jul 2013 at 4:22