persistentstorage/sql/SQLite/random.c
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Wed, 15 Sep 2010 14:05:58 +0300
branchRCL_3
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parent 0 08ec8eefde2f
permissions -rw-r--r--
Revision: 201036 Kit: 201036
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/*
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** 2001 September 15
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**
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** The author disclaims copyright to this source code.  In place of
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** a legal notice, here is a blessing:
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**
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**    May you do good and not evil.
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**    May you find forgiveness for yourself and forgive others.
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**    May you share freely, never taking more than you give.
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**
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*************************************************************************
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** This file contains code to implement a pseudo-random number
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** generator (PRNG) for SQLite.
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**
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** Random numbers are used by some of the database backends in order
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** to generate random integer keys for tables or random filenames.
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**
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** $Id: random.c,v 1.25 2008/06/19 01:03:18 drh Exp $
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*/
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#include "sqliteInt.h"
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/* All threads share a single random number generator.
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** This structure is the current state of the generator.
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*/
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static struct sqlite3PrngType {
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  unsigned char isInit;          /* True if initialized */
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  unsigned char i, j;            /* State variables */
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  unsigned char s[256];          /* State variables */
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} sqlite3Prng;
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/*
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** Get a single 8-bit random value from the RC4 PRNG.  The Mutex
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** must be held while executing this routine.
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**
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** Why not just use a library random generator like lrand48() for this?
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** Because the OP_NewRowid opcode in the VDBE depends on having a very
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** good source of random numbers.  The lrand48() library function may
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** well be good enough.  But maybe not.  Or maybe lrand48() has some
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** subtle problems on some systems that could cause problems.  It is hard
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** to know.  To minimize the risk of problems due to bad lrand48()
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** implementations, SQLite uses this random number generator based
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** on RC4, which we know works very well.
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**
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** (Later):  Actually, OP_NewRowid does not depend on a good source of
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** randomness any more.  But we will leave this code in all the same.
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*/
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static int randomByte(void){
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  unsigned char t;
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  /* Initialize the state of the random number generator once,
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  ** the first time this routine is called.  The seed value does
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  ** not need to contain a lot of randomness since we are not
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  ** trying to do secure encryption or anything like that...
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  **
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  ** Nothing in this file or anywhere else in SQLite does any kind of
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  ** encryption.  The RC4 algorithm is being used as a PRNG (pseudo-random
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  ** number generator) not as an encryption device.
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  */
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  if( !sqlite3Prng.isInit ){
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    int i;
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    char k[256];
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    sqlite3Prng.j = 0;
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    sqlite3Prng.i = 0;
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    sqlite3OsRandomness(sqlite3_vfs_find(0), 256, k);
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    for(i=0; i<256; i++){
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      sqlite3Prng.s[i] = i;
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    }
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    for(i=0; i<256; i++){
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      sqlite3Prng.j += sqlite3Prng.s[i] + k[i];
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      t = sqlite3Prng.s[sqlite3Prng.j];
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      sqlite3Prng.s[sqlite3Prng.j] = sqlite3Prng.s[i];
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      sqlite3Prng.s[i] = t;
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    }
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    sqlite3Prng.isInit = 1;
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  }
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  /* Generate and return single random byte
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  */
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  sqlite3Prng.i++;
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  t = sqlite3Prng.s[sqlite3Prng.i];
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  sqlite3Prng.j += t;
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  sqlite3Prng.s[sqlite3Prng.i] = sqlite3Prng.s[sqlite3Prng.j];
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  sqlite3Prng.s[sqlite3Prng.j] = t;
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  t += sqlite3Prng.s[sqlite3Prng.i];
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  return sqlite3Prng.s[t];
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}
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/*
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** Return N random bytes.
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*/
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void sqlite3_randomness(int N, void *pBuf){
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  unsigned char *zBuf = pBuf;
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#ifndef SQLITE_MUTEX_NOOP
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  sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_PRNG);
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#endif
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  sqlite3_mutex_enter(mutex);
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  while( N-- ){
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    *(zBuf++) = randomByte();
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  }
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  sqlite3_mutex_leave(mutex);
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}
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#ifndef SQLITE_OMIT_BUILTIN_TEST
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/*
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** For testing purposes, we sometimes want to preserve the state of
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** PRNG and restore the PRNG to its saved state at a later time.
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** The sqlite3_test_control() interface calls these routines to
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** control the PRNG.
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*/
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static struct sqlite3PrngType sqlite3SavedPrng;
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void sqlite3PrngSaveState(void){
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  memcpy(&sqlite3SavedPrng, &sqlite3Prng, sizeof(sqlite3Prng));
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}
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void sqlite3PrngRestoreState(void){
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  memcpy(&sqlite3Prng, &sqlite3SavedPrng, sizeof(sqlite3Prng));
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}
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void sqlite3PrngResetState(void){
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  sqlite3Prng.isInit = 0;
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}
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#endif /* SQLITE_OMIT_BUILTIN_TEST */