Return bignum '0' when BN_rand is asked for a 0 bit random number.

[openssl.git] / crypto / bn / bn_rand.c

diff --git a/crypto/bn/bn_rand.c b/crypto/bn/bn_rand.c
index b1163f7ec44172078a4a15564862db72ed752233..21ecbc04ed0aa53e88a22a8f0e5b9935b4704b13 100644 (file)
--- a/crypto/bn/bn_rand.c
+++ b/crypto/bn/bn_rand.c
@@ -68,6 +68,12 @@ static int bnrand(int pseudorand, BIGNUM *rnd, int bits, int top, int bottom)
        int ret=0,bit,bytes,mask;
        time_t tim;
 
+       if (bits == 0)
+               {
+               BN_zero(rnd);
+               return 1;
+               }
+
        bytes=(bits+7)/8;
        bit=(bits-1)%8;
        mask=0xff<<bit;