diff options
Diffstat (limited to 'cipher/random.c')
| -rw-r--r-- | cipher/random.c | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/cipher/random.c b/cipher/random.c index f865693b4..a95e7e50d 100644 --- a/cipher/random.c +++ b/cipher/random.c @@ -40,7 +40,6 @@ static struct cache cache[3]; #define MASK_LEVEL(a) do {if( a > 2 ) a = 2; else if( a < 0 ) a = 0; } while(0) -static int open_device( const char *name, int minor ); static void fill_buffer( byte *buffer, size_t length, int level ); /**************** @@ -70,6 +69,7 @@ get_random_byte( int level ) +#ifdef HAVE_DEV_RANDOM static int open_device( const char *name, int minor ) @@ -149,3 +149,26 @@ the OS a chance to collect more entropy! (Need %d more bytes)\n", length ); } while( length ); } +#else /* not HAVE_DEV_RANDOM */ + + +static void +fill_buffer( byte *buffer, size_t length, int level ) +{ + static int initialized=0; + + if( !initialized ) { + log_info("warning: using insecure random number generator!!\n"); + tty_printf("The random number generator is only a kludge to let\n" + "it compile - it is in no way a strong RNG!\n\n" + "DON'T USE ANY DATA GENERATED BY THIS PROGRAM!!\n\n"); + initialized=1; + srand(make_timestamp()*getpid()); + } + + while( length-- ) + *buffer++ = ((unsigned)(1 + (int) (256.0*rand()/(RAND_MAX+1.0)))-1); +} + +#endif + |