From Crypto++ Wiki
Crypto++® Library 5.6
Free C++ class library of Cryptographic Schemes
Denis Bider's Crypto++ User Guide is available on the Crypto++ wiki. All files in the collection can be found in User Guide. Everyone who is new to Crypto++ should familiarize themselves with the filter section. Note: the User Guide is somewhat dated now. Even though all functionality is present, some objects no longer exist.
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