aguard_crypt.h

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/* LABEL-NO */
 
#pragma once
 
#include "key.h"
MK_NUM selKey = 1;
#define IDENT "aguard"
 
static void guard_crypt (register MK_BINN data, MK_SIZE size, bool const flag) {
  if (selKey == 0) return;
  register MK_BINN key   = KEY_REF[selKey];
  const MK_BINN keyend   = KEY_REF[selKey]+KEY_LEN[selKey];
  const MK_BINN dataend  = data+size;
  for (;data<dataend; data++,key++) {
    if (key >= keyend) {
      key=KEY_REF[selKey];
    }
    if (flag) {
      *(MK_BIN)data += *key;
    } else {
      *(MK_BIN)data -= *key;
    }
  }
}
 
static void __attribute__ ((noreturn))
FilterHelp (const char * base)
{
  fputs("\n", stderr);
  fprintf(stderr, "usage: %s [OPTION]... [ARGUMENT]...\n", base);
  fputs("\n", stderr);
  fputs("  This tool is the data protection filter of NHI1.\n", stderr);
  fputs("\n", stderr);
  fprintf(stderr, "  %s [ARGUMENT]... syntax:\n", base);
  fprintf(stderr, "    aclient... %c %s --key NUM ... [encrypted] ... %c %s --key NUM... %c aserver\n", 
                          MK_ALFA, base, MK_ALFA, base, MK_ALFA);
  fputs("\n", stderr);
  fputs(MqHelp (NULL), stderr);
  fputs("\n", stderr);
  fprintf(stderr, "  %s [OPTION]:\n", base);
  fputs(          "    -h, --help       print this help\n", stderr);
  fputs(          "    -d, --dig        print the key diggest\n", stderr);
  fprintf(stderr, "    -k, --key  NUM   select the KEY for encryption...(0 <= NUM <= %i)\n", KEY_NUM);
  fputs(          "                       0 = NO\n", stderr);
  fputs(          "                       1 = DEFAULT\n", stderr);
  fputs("\n", stderr);
 
  exit(EXIT_SUCCESS);
}
 
static enum MkErrorE 
FilterArgs (MK_RT_ARGS MQ_CTX mqctx, MK_BFL args)
{
  bool printDIG = false;
 
  MkBufferListCheckOptionO_3E(args, "-d",    &printDIG);
  MkBufferListCheckOptionO_3E(args, "--dig", &printDIG);
 
  if (printDIG == true) {
    fprintf(stderr,"\n");
    fprintf(stderr,"'%s' key information..\n", MqConfigGetName(mqctx));
    fprintf(stderr,"\n");
    fprintf(stderr,"  sign-dat: %s\n", DIG_DATE);
    fprintf(stderr,"  sign-dig: %s\n", DIG_DATA);
    fprintf(stderr,"  sign-min: %i byte\n", KEY_MIN);
    fprintf(stderr,"  sign-num: %i\n", KEY_NUM);
    fprintf(stderr,"\n");
 
    return MK_CONTINUE;
  }
 
  MkBufferListCheckOptionI_3E(args, "-k",    &selKey);
  MkBufferListCheckOptionI_3E(args, "--key", &selKey);
 
  if (selKey < 0 || selKey > KEY_NUM) {
    return MkErrorSetV_1E("key-error: invalid value for argument '-k,--key', '%i' have to be: '0 <= NUM <= %i'", 
                              selKey, KEY_NUM);
  }
 
  return MK_OK;
error:
  return MK_ERROR;
}