/usr/include/bobcat/decryptbuf is in libbobcat-dev 3.19.01-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 | #ifndef INCLUDED_DECRYPTBUF_
#define INCLUDED_DECRYPTBUF_
#include <iosfwd>
#include <streambuf>
#include <openssl/ossl_typ.h>
namespace FBB
{
struct DecryptBufImp;
class DecryptBuf: public std::streambuf
{
    DecryptBufImp *d_pimpl;
    static bool s_completed;
    public:
        DecryptBuf(std::ostream &outStream, char const *type, 
                            std::string key, std::string iv,
                            size_t bufsize = 1024);
        virtual ~DecryptBuf();
        void setIv(std::string iv);
        bool setRounds(size_t nRounds);             // RC5 8, 12 or 16
        void done();
        static bool lastOK();                       // .f
    protected:
        EVP_CIPHER_CTX *cipherCtx();
    private:
        void update();
        void open();
        void installKey(std::string const &key, size_t length);
        virtual int overflow(int c);
};
inline bool DecryptBuf::lastOK()
{
    return s_completed;
}
}   // FBB
        
#endif
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