External Public-Key Authentication API (#72) * Implemented dynamic loading of an external plug-in shared library to delegate public key authentication * Moved conditional compilation of the plugin infrastructure into the configure.ac script to be able to add -ldl to dropbear build only when the flag is enabled * Added tags file to the ignore list * Updated API to have the constructor to return function pointers in the pliugin instance. Added support for passing user name to the checkpubkey function. Added options to the session returned by the plugin and have dropbear to parse and process them * Added -rdynamic to the linker flags when EPKA is enabled * Changed the API to pass a previously created session to the checkPubKey function (created during preauth) * Added documentation to the API * Added parameter addrstring to plugin creation function * Modified the API to retrieve the auth options. Instead of having them as field of the EPKASession struct, they are stored internally (plugin-dependent) in the plugin/session and retrieved through a pointer to a function (in the session) * Changed option string to be a simple char * instead of unsigned char *

/* LibTomCrypt, modular cryptographic library -- Tom St Denis
 *
 * LibTomCrypt is a library that provides various cryptographic
 * algorithms in a highly modular and flexible manner.
 *
 * The library is free for all purposes without any express
 * guarantee it works.
 */

/**
   @file ocb3_int_xor_blocks.c
   OCB implementation, INTERNAL ONLY helper, by Karel Miko
*/
#include "tomcrypt.h"

#ifdef LTC_OCB3_MODE

/**
   Compute xor for two blocks of bytes 'out = block_a XOR block_b' (internal function)
   @param out        The block of bytes (output)
   @param block_a    The block of bytes (input)
   @param block_b    The block of bytes (input)
   @param block_len  The size of block_a, block_b, out
*/
void ocb3_int_xor_blocks(unsigned char *out, const unsigned char *block_a, const unsigned char *block_b, unsigned long block_len)
{
   int x;
   if (out == block_a) {
     for (x = 0; x < (int)block_len; x++) out[x] ^= block_b[x];
   }
   else {
     for (x = 0; x < (int)block_len; x++) out[x] = block_a[x] ^ block_b[x];
   }
}

#endif

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