diff options
Diffstat (limited to 'src/common/crypto.c')
| -rw-r--r-- | src/common/crypto.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/src/common/crypto.c b/src/common/crypto.c index 8da2916dcb..afec91d22d 100644 --- a/src/common/crypto.c +++ b/src/common/crypto.c @@ -999,10 +999,23 @@ int crypto_rand(unsigned int n, unsigned char *to) return (RAND_bytes(to, n) != 1); } -int crypto_pseudo_rand(unsigned int n, unsigned char *to) +void crypto_pseudo_rand(unsigned int n, unsigned char *to) { assert(to); - return (RAND_pseudo_bytes(to, n) == -1); + if (RAND_pseudo_bytes(to, n) == -1) { + log_fn(LOG_ERR, "RAND_pseudo_bytes failed unexpectedly."); + exit(1); + } +} + +int crypto_pseudo_rand_int(int max) { + unsigned int val; + crypto_pseudo_rand(sizeof(val), (unsigned char*) &val); + /* Bug: Low values are _slightly_ favored over high values because + * ((unsigned)-1)%max != max-1 . This shouldn't matter if max is + * significantly smaller than ((unsigned)-1). + **/ + return val % max; } /* errors */ |