diff options
Diffstat (limited to 'crypto/bn/bn_rand.c')
-rw-r--r-- | crypto/bn/bn_rand.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/crypto/bn/bn_rand.c b/crypto/bn/bn_rand.c index bab4510345..f2c79b5e31 100644 --- a/crypto/bn/bn_rand.c +++ b/crypto/bn/bn_rand.c @@ -168,3 +168,14 @@ int BN_bntest_rand(BIGNUM *rnd, int bits, int top, int bottom) return bnrand(2, rnd, bits, top, bottom); } #endif + +/* random number r: min <= r < max */ +int BN_rand_range(BIGNUM *r, BIGNUM *min, BIGNUM *max) + { + int n = BN_num_bits(max); + do + { + if (!BN_rand(r, n, 0, 0)) return 0; + } while ((min && BN_cmp(r, min) < 0) || BN_cmp(r, max) >= 0); + return 1; + } |