diff options
Diffstat (limited to 'docs/tutorials/015/Crypt.cpp')
| -rw-r--r-- | docs/tutorials/015/Crypt.cpp | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/docs/tutorials/015/Crypt.cpp b/docs/tutorials/015/Crypt.cpp index 26827ce44b0..1e20b8f5b42 100644 --- a/docs/tutorials/015/Crypt.cpp +++ b/docs/tutorials/015/Crypt.cpp @@ -4,6 +4,8 @@ #include "Crypt.h" #include "ace/SOCK_Stream.h" +/* The expected constructor... + */ Crypt::Crypt( int _thr_count ) : inherited(_thr_count) { @@ -13,13 +15,19 @@ Crypt::~Crypt(void) { } +/* To send the data we'll apply a signature and encryption. + */ int Crypt::send(ACE_Message_Block *message, ACE_Time_Value *timeout) { ACE_DEBUG ((LM_INFO, "(%P|%t) Crypt::send() encrypting (%s)\n", message->rd_ptr() )); + // I suspect that some encryptors might change the data size. + // It probably isn't safe to create a same-size destination buffer. ACE_Message_Block * encrypted = new ACE_Message_Block( message->size() ); - // Perform a bogus encryption algorithm + // Perform a bogus encryption algorithm and add our safety + // signature. Adding the original data size is also probably + // a good idea that I haven't encorporated here. ACE_OS::sprintf( encrypted->wr_ptr(), "ED:%s", message->rd_ptr() ); encrypted->wr_ptr( strlen(encrypted->wr_ptr())+1 ); @@ -32,12 +40,18 @@ int Crypt::send(ACE_Message_Block *message, ACE_Time_Value *timeout) return( 0 ); } +/* The upstream movement requires that we decrypt what the peer has + given us. +*/ int Crypt::recv(ACE_Message_Block *message, ACE_Time_Value *timeout) { ACE_DEBUG ((LM_INFO, "(%P|%t) Crypt::recv() decrypting (%s)\n", message->rd_ptr() )); + // Create a destination for the decrypted data. The same + // block size caveat exists of course. ACE_Message_Block * decrypted = new ACE_Message_Block( message->size() ); + // Check the signature as expected. if( ACE_OS::strncmp( message->rd_ptr(), "ED:", 3 ) ) { ACE_DEBUG ((LM_INFO, "(%P|%t) Improperly encrypted data.\n" )); @@ -45,6 +59,8 @@ int Crypt::recv(ACE_Message_Block *message, ACE_Time_Value *timeout) return(-1); } + // Don't forget to skip past the signature before decrypting + // or things will be quite exciting! message->rd_ptr( 3 ); // Perform a bogus decryption algorithm |