FBB::CryptBuf - std::streambuf derived base class for DecryptBuf and EncryptBuf

       Frank B. Brokken (f.b.brokken@rug.nl).

libbobcat-dev_5.09.01                               2005-2021                             FBB::CryptBuf(3bobcat)

       Bobcat is an acronym of `Brokken’s Own Base Classes And Templates’.

       o      https://fbb-git.gitlab.io/bobcat/: gitlab project page;

       o      bobcat_5.09.01-x.dsc: detached signature;

       o      bobcat_5.09.01-x.tar.gz: source archive;

       o      bobcat_5.09.01-x_i386.changes: change log;

       o      libbobcat1_5.09.01-x_*.deb: debian package containing the libraries;

       o      libbobcat1-dev_5.09.01-x_*.deb: debian package containing the libraries, headers and manual pages;

       None Reported.

       This is free software, distributed under the terms of the GNU General Public License (GPL).

       The class CryptBuf inherits from EoiBuf and may therefore be used as a base class of classes specializing
       std::streambuf.  It is used as base class for the classes DecryptBuf and EncryptBuf, offering a protected
       member for accessing cipher information.

       Here is an example from the implementation of EncryptBuf’s constructor:

       #include "encryptbuf.ih"

       EncryptBuf::EncryptBuf(ostream &outStream, char const *type,
                              string key, string const &iv, size_t size)
       :
           CryptBuf(type, size),
           d_ctx(EVP_CIPHER_CTX_new()),
           d_encrypted(size + EVP_MAX_BLOCK_LENGTH, 0),
           d_iv(iv),
           d_key(key),
           d_outStream(outStream)
       {
           prepareIV();

           if (
               not EVP_EncryptInit_ex(d_ctx, md(), 0, ucharPtr(d_key),
                                                      ucharPtr(d_iv))
           )
               throw Exception{ 1 } << "Encrypt initialization failed";

           setp();
       }

bobcat/cryptbuf - defines the class interface

EoiBuf (and thus from: std::streambuf)

       FBB::CryptBuf - std::streambuf derived base class for DecryptBuf and EncryptBuf

FBB
       All constructors, members, operators and manipulators, mentioned in this man-page,  are  defined  in  the
       namespace FBB.

       Analogously to std::streambuf only a protected constructor is available.

       o      CryptBuf(charconst*type,size_tbufSize):
              The  type is a null-terminated byte string specifying the de/encryption method. E.g., aes-128-cbc.
              For an overview see the encryptbuf(3bobcat) man-page. The bufSize parameter  defines  the  initial
              size of the internally used buffer (defined by EoiBuf).

       Copy and move constructors (and assignment operators) are not available.

       All members of std:streambuf and EoiBuf are available, as FBB::CryptBuf inherits from these classes.

       o      EVP_CIPHERconst*md()const:
              A pointer to the cipher information is returned.

bobcat(7), decryptbuf(3bobcat), encryptbuf(3bobcat), eoibuf(3bobcat), eoi(3bobcat)

#include<bobcat/cryptbuf>
       Linking option: -lbobcat-lcrypto