ibecacheimpl.c

IBE是一种非对称密码技术

    /* Acquire the cache lock to syncronize access */
    VOLT_SET_FNCT_LINE (fnctLine)
    status = ctx->LockIBECache(ibeCacheCtx);
    if (status != 0)
      break;
    
    lockAcquired = 1;
    
    /* Run through the entry link list. If we find a match, we'll adjust
    * the entry.
    */
    nextEntry = cache->cacheList;
    while (nextEntry != (VoltIBECacheEntry *)0)
    {
      entry = nextEntry;
      nextEntry = (VoltIBECacheEntry *)(entry->nextEntry);
      if (entry->theCtx != *theCtx)
        continue;

      /* The ctx matched, decrement this entry's counter and set theCtx
      * to NULL.
      */
      *theCtx = (Pointer)0;
      if (entry->referenceCount != 0)
        entry->referenceCount--;
      break;
    }
  }
  while (0);
  
  if (lockAcquired)
  {
    status2 = ctx->UnlockIBECache(ibeCacheCtx);
    if (status == 0)
    {
      VOLT_SET_FNCT_LINE (fnctLine)
      status = status2;
    }
  }

  VOLT_LOG_ERROR_INFO_COMPARE (
    status, 0, ibeCacheCtx, status, 0, 0,
    (char *)0, "VoltReleaseBfCtxFromCache", fnctLine, (char *)0)

  return (status);
}

int VoltGetIBECacheEntryCount (
   Pointer ibeCacheCtx,
   unsigned int *count
   )
{
  int status, status2;
  int lockAcquired = 0;
  unsigned int theCount;
  VoltIBECacheCtx *ctx = (VoltIBECacheCtx *)ibeCacheCtx;
  VoltIBELocalCache *cache = (VoltIBELocalCache *)(ctx->localCtx);
  VoltIBECacheEntry *nextEntry;
  VOLT_DECLARE_FNCT_LINE (fnctLine)

  do
  {
    VOLT_SET_FNCT_LINE (fnctLine)
    status = ctx->LockIBECache(ibeCacheCtx);
    if (status != 0)
      break;
    
    lockAcquired = 1;
    
    /* Run through the list until finding the last one. Count how many
    * there are.
    */
    nextEntry = cache->cacheList;
    theCount = 0;
    while (nextEntry != (VoltIBECacheEntry *)0)
    {
      nextEntry = (VoltIBECacheEntry *)(nextEntry->nextEntry);
      theCount++;
    }

    *count = theCount;
  }
  while (0);
  
  if (lockAcquired)
  {
    status2 = ctx->UnlockIBECache(ibeCacheCtx);
    if (status == 0)
    {
      VOLT_SET_FNCT_LINE (fnctLine)
      status = status2;
    }
  }
  
  VOLT_LOG_ERROR_INFO_COMPARE (
    status, 0, ibeCacheCtx, status, 0, 0,
    (char *)0, "VoltGetIBECacheEntryCount", fnctLine, (char *)0)

  return (status);
}

int VoltGetIBECacheEntry (
   Pointer ibeCacheCtx,
   unsigned int index,
   unsigned char *element,
   unsigned int bufferSize,
   unsigned int *elementLen
   )
{
  int status, status2;
  int lockAcquired = 0;
  unsigned int count;
  VoltIBECacheCtx *ctx = (VoltIBECacheCtx *)ibeCacheCtx;
  VoltIBELocalCache *cache = (VoltIBELocalCache *)(ctx->localCtx);
  VoltIBECacheEntry *entry;
  VOLT_DECLARE_ERROR_TYPE (errorType)
  VOLT_DECLARE_FNCT_LINE (fnctLine)

  do
  {
    /* Acquire the cache lock to syncronize access */
    VOLT_SET_ERROR_TYPE (errorType, 0)
    VOLT_SET_FNCT_LINE (fnctLine)
    status = ctx->LockIBECache(ibeCacheCtx);
    if (status != 0)
      break;
    
    lockAcquired = 1;
    
    /* Run through the list, counting the entries until the count equals
     * the index.
     */
    entry = cache->cacheList;
    count = 0;
    while (entry != (VoltIBECacheEntry *)0)
    {
      if (index == count)
        break;
      entry = (VoltIBECacheEntry *)(entry->nextEntry);
      count++;
    }

    /* If entry is NULL, there is no entry at the requested index.
     */
    VOLT_SET_ERROR_TYPE (errorType, VT_ERROR_TYPE_PRIMARY)
    VOLT_SET_FNCT_LINE (fnctLine)
    status = VT_ERROR_NO_ELEMENT_AT_INDEX;
    if (entry == (VoltIBECacheEntry *)0)
      break;

    if (entry->ctxType == VOLT_IBE_CTX_TYPE_BF)
    {
      VOLT_SET_ERROR_TYPE (errorType, 0)
      VOLT_SET_FNCT_LINE (fnctLine)
      status = VoltBuildCacheElementBF (
        ctx, cache, entry, element, bufferSize, elementLen);
    }
    else
    {
      VOLT_SET_ERROR_TYPE (errorType, 0)
      VOLT_SET_FNCT_LINE (fnctLine)
      status = VoltBuildCacheElementBB (
        ctx, cache, entry, element, bufferSize, elementLen);
    }

  } while (0);

  if (lockAcquired)
  {
    status2 = ctx->UnlockIBECache(ibeCacheCtx);
    if (status == 0)
    {
      VOLT_SET_ERROR_TYPE (errorType, 0)
      VOLT_SET_FNCT_LINE (fnctLine)
      status = status2;
    }
  }

  VOLT_LOG_ERROR_INFO_COMPARE (
    status, 0, ibeCacheCtx, status, 0, errorType,
    (char *)0, "VoltGetIBECacheEntry", fnctLine, (char *)0)

  return (status);
}

int VoltParseIBECacheEntry (
   VoltLibCtx *libCtx,
   Pointer ibeCacheCtx,
   unsigned char *element,
   unsigned int elementLen,
   unsigned int *flag,
   unsigned char **reference,
   unsigned int *referenceLen
   )
{
  int status;
  unsigned int primeLen, subprimeLen, offset;
  VOLT_DECLARE_ERROR_TYPE (errorType)
  VOLT_DECLARE_FNCT_LINE (fnctLine)

  do
  {
    /* There must be at least 14 bytes for the leading integers (flag,
     * primeLen, etc.)
     */
    VOLT_SET_ERROR_TYPE (errorType, VT_ERROR_TYPE_PRIMARY)
    VOLT_SET_FNCT_LINE (fnctLine)
    status = VT_ERROR_GET_INFO_UNAVAILABLE;
    if (elementLen < 14)
      break;

    /* The first value is the flag.
     */
    *flag = GetIntegerBE (element, 2);

    /* The next numbers are the primeLen, subprimeLen, and accelCount.
     * We don't need the accel count.
     */
    primeLen = GetIntegerBE (element + 2, 4);
    subprimeLen = GetIntegerBE (element + 6, 4);

    /* There should be at least a prime, subprime, baseX, baseY, pubX,
     * and pubY (if BB, there are three public points, but we're
     * interested in the first public point).
     */
    VOLT_SET_FNCT_LINE (fnctLine)
    offset = (5 * primeLen) + subprimeLen + 14;
    if (elementLen < offset)
      break;

    /* We set offset to just beyond the pubY, move back.
     */
    offset -= primeLen;

    /* Skip any leading 00 bytes (not likely, but check anyway.
     */
    while ( (element[offset] == 0) && (primeLen > 1) )
    {
      offset++;
      primeLen--;
    }

    /* The reference is the block of coordinates after the subprime.
     */
    *reference = element + 14 + primeLen + subprimeLen;
    *referenceLen = 4 * primeLen;

    status = 0;

  } while (0);

  VOLT_LOG_ERROR_INFO_COMPARE (
    status, libCtx, 0, status, 0, errorType,
    (char *)0, "VoltParseIBECacheEntry", fnctLine, (char *)0)

  return (status);
}

int VoltSetIBECacheEntry (
   Pointer ibeCacheCtx,
   VoltMpIntCtx *mpCtx,
   unsigned char *element,
   unsigned int elementLen,
   unsigned int *returnIndex
   )
{
  int status, status2;
  int lockAcquired = 0;
  unsigned int flag, primeLen, subprimeLen, refLen, accelCount, offset, index;
  unsigned char *ref;
  VoltIBECacheCtx *ctx = (VoltIBECacheCtx *)ibeCacheCtx;
  VoltIBELocalCache *cache = (VoltIBELocalCache *)(ctx->localCtx);
  VoltLibCtx *libCtx = (VoltLibCtx *)(ctx->voltObject.libraryCtx);
  VoltIBECacheEntry *entry = (VoltIBECacheEntry *)0;
  VoltIBECacheEntry *nextEntry;
  bb1_context_t *bbCtx = (bb1_context_t *)0;
  bf_context_t *bfCtx = (bf_context_t *)0;
  VOLT_DECLARE_ERROR_TYPE (errorType)
  VOLT_DECLARE_FNCT_LINE (fnctLine)

  do
  {
    /* Isolate the flag, prime, subprime, base point, and public point.
     */
    VOLT_SET_ERROR_TYPE (errorType, VT_ERROR_TYPE_PRIMARY)
    VOLT_SET_FNCT_LINE (fnctLine)
    status = VT_ERROR_INVALID_SET;
    if (elementLen < 14)
      break;

    /* The first value is the flag.
     */
    flag = GetIntegerBE (element, 2);

    /* The next numbers are the primeLen, subprimeLen, and accelCount.
     */
    primeLen = GetIntegerBE (element + 2, 4);
    subprimeLen = GetIntegerBE (element + 6, 4);
    accelCount = GetIntegerBE (element + 10, 4);

    /* If BF, the total byte length should be
     *  14 + subprimeLen + [(accelCount * 2) + 5] * primeLen
     * If BB, the total length should be
     *  14 + subprimeLen + [(accelCount * 6) + 9] * primeLen
     * If neither, error.
     */
    VOLT_SET_FNCT_LINE (fnctLine)
    if (flag == VT_IBE_CACHE_ENTRY_BF_TYPE1)
      offset = (accelCount * 2) + 5;
    else if (flag == VT_IBE_CACHE_ENTRY_BB_TYPE1)
      offset = (accelCount * 6) + 9;
    else
      break;

    offset *= primeLen;
    offset += subprimeLen + 14;

    VOLT_SET_FNCT_LINE (fnctLine)
    if (elementLen != offset)
      break;

    /* The reference is the block of coordinates after the subprime.
     */
    ref = element + 14 + primeLen + subprimeLen;
    refLen = 4 * primeLen;

    /* Acquire the cache lock to syncronize access */
    VOLT_SET_ERROR_TYPE (errorType, 0)
    VOLT_SET_FNCT_LINE (fnctLine)
    status = ctx->LockIBECache(ibeCacheCtx);
    if (status != 0)
      break;
    
    lockAcquired = 1;
    
    /* Run through the list, check to see if the entry is already in
     * the cache. If not, we'll find the end of the list, where we'll
     * add a new entry.
     */
    status = 0;
    nextEntry = cache->cacheList;
    index = 0;
    while (nextEntry != (VoltIBECacheEntry *)0)
    {
      entry = nextEntry;
      if (entry->reference.len == refLen)
      {
        if (Z2Memcmp (ref, entry->reference.data, refLen) == 0)
          break;
      }
      nextEntry = (VoltIBECacheEntry *)(entry->nextEntry);
      index++;
    }

    *returnIndex = index;

    /* If nextEntry is not NULL, we broke out early. If we broke out
     * early, we found a match.
     */
    if (nextEntry != (VoltIBECacheEntry *)0)
      break;

    /* Build a bfCtx or bbCtx.
     */
    if (flag == VT_IBE_CACHE_ENTRY_BF_TYPE1)
    {
      VOLT_SET_ERROR_TYPE (errorType, 0)
      VOLT_SET_FNCT_LINE (fnctLine)
      status = BuildBfCtxFromCacheEntry (
        libCtx, mpCtx, primeLen, subprimeLen, accelCount, element, &bfCtx);
    }
    else
    {
      VOLT_SET_ERROR_TYPE (errorType, 0)
      VOLT_SET_FNCT_LINE (fnctLine)
      status = BuildBbCtxFromCacheEntry (
        libCtx, mpCtx, primeLen, subprimeLen, accelCount, element, &bbCtx);
    }

  } while (0);

  if (lockAcquired)
  {
    status2 = ctx->UnlockIBECache(ibeCacheCtx);
    if (status == 0)
    {
      VOLT_SET_ERROR_TYPE (errorType, 0)
      VOLT_SET_FNCT_LINE (fnctLine)
      status = status2;
    }
  }

  /* We had to build the bfCtx or bbCtx to get it into the cache. But
   * we don't really need it, so release it.
   */
  VoltReleaseBfCtx (libCtx, &bfCtx);
  VoltReleaseBbCtx (libCtx, &bbCtx);

  VOLT_LOG_ERROR_INFO_COMPARE (
    status, 0, ibeCacheCtx, status, 0, errorType,
    (char *)0, "VoltSetIBECacheEntry", fnctLine, (char *)0)

  return (status);
}

int VoltDeleteIBECacheEntry (
   Pointer ibeCacheCtx,
   unsigned int index
   )
{
  int status, status2;
  int lockAcquired = 0;