基于C++的SNMP++开发包

关于C++编写的SNMP协议实现，很好的东西，扩展性好

/* encrypt V1.1 Fri Oct 18 04:28:03 NZDT 2002 */
/* File de/encryption using libtomcrypt */
/* Written by Daniel Richards  */
/* Help from Tom St Denis with various bits */
/* This code is public domain no rights reserved. */
/* Encrypts by default -d flag enables decryption */
/* ie: ./encrypt blowfish story.txt story.ct */
/* ./encrypt -d blowfish story.ct story.pt */

#include 

int errno;

int usage（char *name） 
{
   int x;

   printf（“Usage: %s [-d]（ecrypt） cipher infile outfile\nCiphers:\n“ name）;
   for （x = 0; cipher_descriptor[x].name != NULL; x++） {
      printf（“%s\n“cipher_descriptor[x].name）;
   }
   exit（1）;
}

void register_algs（void）
{
   int x;
   
#ifdef LTC_RIJNDAEL
  register_cipher （&aes_desc）;
#endif
#ifdef LTC_BLOWFISH
  register_cipher （&blowfish_desc）;
#endif
#ifdef LTC_XTEA
  register_cipher （&xtea_desc）;
#endif
#ifdef LTC_RC5
  register_cipher （&rc5_desc）;
#endif
#ifdef LTC_RC6
  register_cipher （&rc6_desc）;
#endif
#ifdef LTC_SAFERP
  register_cipher （&saferp_desc）;
#endif
#ifdef LTC_TWOFISH
  register_cipher （&twofish_desc）;
#endif
#ifdef LTC_SAFER
  register_cipher （&safer_k64_desc）;
  register_cipher （&safer_sk64_desc）;
  register_cipher （&safer_k128_desc）;
  register_cipher （&safer_sk128_desc）;
#endif
#ifdef LTC_RC2
  register_cipher （&rc2_desc）;
#endif
#ifdef LTC_DES
  register_cipher （&des_desc）;
  register_cipher （&des3_desc）;
#endif
#ifdef LTC_CAST5
  register_cipher （&cast5_desc）;
#endif
#ifdef LTC_NOEKEON
  register_cipher （&noekeon_desc）;
#endif
#ifdef LTC_SKIPJACK
  register_cipher （&skipjack_desc）;
#endif
#ifdef LTC_KHAZAD
  register_cipher （&khazad_desc）;
#endif
#ifdef LTC_ANUBIS
  register_cipher （&anubis_desc）;
#endif

   if （register_hash（&sha256_desc） == -1） {
      printf（“Error registering LTC_SHA256\n“）;
      exit（-1）;
   } 

   if （register_prng（&yarrow_desc） == -1） {
      printf（“Error registering yarrow PRNG\n“）;
      exit（-1）;
   }

   if （register_prng（&sprng_desc） == -1） {
      printf（“Error registering sprng PRNG\n“）;
      exit（-1）;
   }
}

int main（int argc char *argv[]） 
{
   unsigned char plaintext[512]ciphertext[512];
   unsigned char tmpkey[512] key[MAXBLOCKSIZE] IV[MAXBLOCKSIZE];
   unsigned char inbuf[512]; /* i/o block size */
   unsigned long outlen y ivsize x decrypt;
   symmetric_CTR ctr;
   int cipher_idx hash_idx ks;
   char *infile *outfile *cipher;
   prng_state prng;
   FILE *fdin *fdout;

   /* register algs so they can be printed */
   register_algs（）;

   if （argc < 4） {
      return usage（argv[0]）;
   }

   if （!strcmp（argv[1] “-d“）） {
      decrypt = 1;
      cipher  = argv[2];
      infile  = argv[3];
      outfile = argv[4];
   } else {
      decrypt = 0;
      cipher  = argv[1];
      infile  = argv[2];
      outfile = argv[3];
   }   

   /* file handles setup */
   fdin = fopen（infile“rb“）;
   if （fdin == NULL） {
      perror（“Can‘t open input for reading“）;
      exit（-1）;
   }

   fdout = fopen（outfile

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

     文件        902  2007-05-12 22:46  crypt\build.sh

     文件     111298  2007-05-12 22:46  crypt\changes

     文件       1233  2007-05-12 22:46  crypt\crypt.lof

     文件     297576  2007-05-12 22:46  crypt\crypt.tex

     文件       6160  2007-05-12 22:46  crypt\demos\encrypt.c

     文件       2988  2007-05-12 22:46  crypt\demos\hashsum.c

     文件       4333  2007-05-12 22:46  crypt\demos\multi.c

     文件        334  2007-05-12 22:46  crypt\demos\small.c

     文件       1794  2007-05-12 22:46  crypt\demos\test.c

     文件        646  2007-05-12 22:46  crypt\demos\timing.c

     文件      24417  2007-05-12 22:46  crypt\demos\tv_gen.c

     文件     827358  2007-05-12 22:46  crypt\doc\crypt.pdf

     文件        325  2007-05-12 22:46  crypt\doc\footer.html

     文件        422  2007-05-12 22:46  crypt\doc\header.html

     文件      47498  2007-05-12 22:46  crypt\Doxyfile

     文件        517  2007-05-12 22:46  crypt\filter.pl

     文件        218  2007-05-12 22:46  crypt\fixupind.pl

     文件        681  2007-05-12 22:46  crypt\genlist.sh

     文件      34650  2007-05-12 22:46  crypt\libtomcrypt.dsp

     文件         82  2007-05-12 22:46  crypt\LICENSE

     文件      17728  2007-05-12 22:46  crypt\makefile

     文件      14754  2007-05-12 22:46  crypt\makefile.icc

     文件      11445  2007-05-12 22:46  crypt\makefile.msvc

     文件      14414  2007-05-12 22:46  crypt\makefile.shared

     文件      13617  2009-05-27 20:07  crypt\makefile.unix

     文件        122  2007-05-12 22:46  crypt\mess.sh

     文件        993  2007-05-12 22:46  crypt\notes\base64_tv.txt

     文件      14683  2007-05-12 22:46  crypt\notes\ccm_tv.txt

     文件      52936  2007-05-12 22:46  crypt\notes\cipher_tv.txt

     文件      23807  2007-05-12 22:46  crypt\notes\eax_tv.txt

............此处省略757个文件信息