[openssh-commits] [openssh] 01/03: Remove arc4random_uniform from arc4random.c

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dtucker pushed a commit to branch master
in repository openssh.

commit c83e467ead67a8cb48ef4bec8085d6fb880a2ff4
Author: Darren Tucker <dtucker at dtucker.net>
Date:   Fri Sep 2 14:17:28 2022 +1000

    Remove arc4random_uniform from arc4random.c
    
    This was previously moved into its own file (matching OpenBSD) which
    prematurely committed in commit 73541f2.
---
 openbsd-compat/arc4random.c | 38 --------------------------------------
 1 file changed, 38 deletions(-)

diff --git a/openbsd-compat/arc4random.c b/openbsd-compat/arc4random.c
index 2f91c2b2..2751fb83 100644
--- a/openbsd-compat/arc4random.c
+++ b/openbsd-compat/arc4random.c
@@ -242,44 +242,6 @@ arc4random_buf(void *_buf, size_t n)
 }
 #endif /* !defined(HAVE_ARC4RANDOM_BUF) && defined(HAVE_ARC4RANDOM) */
 
-#ifndef HAVE_ARC4RANDOM_UNIFORM
-/*
- * Calculate a uniformly distributed random number less than upper_bound
- * avoiding "modulo bias".
- *
- * Uniformity is achieved by generating new random numbers until the one
- * returned is outside the range [0, 2**32 % upper_bound).  This
- * guarantees the selected random number will be inside
- * [2**32 % upper_bound, 2**32) which maps back to [0, upper_bound)
- * after reduction modulo upper_bound.
- */
-u_int32_t
-arc4random_uniform(u_int32_t upper_bound)
-{
-	u_int32_t r, min;
-
-	if (upper_bound < 2)
-		return 0;
-
-	/* 2**32 % x == (2**32 - x) % x */
-	min = -upper_bound % upper_bound;
-
-	/*
-	 * This could theoretically loop forever but each retry has
-	 * p > 0.5 (worst case, usually far better) of selecting a
-	 * number inside the range we need, so it should rarely need
-	 * to re-roll.
-	 */
-	for (;;) {
-		r = arc4random();
-		if (r >= min)
-			break;
-	}
-
-	return r % upper_bound;
-}
-#endif /* !HAVE_ARC4RANDOM_UNIFORM */
-
 #if 0
 /*-------- Test code for i386 --------*/
 #include <stdio.h>

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