bn_recp: reformat another ugly comment

1 files changed, 6 insertions, 5 deletions

diff --git a/src/lib/libcrypto/bn/bn_recp.c b/src/lib/libcrypto/bn/bn_recp.c
index d5070bc003..e3f22c52a9 100644
--- a/src/lib/libcrypto/bn/bn_recp.c
+++ b/src/lib/libcrypto/bn/bn_recp.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: bn_recp.c,v 1.32 2025/02/04 12:47:58 tb Exp $ */
+/* $OpenBSD: bn_recp.c,v 1.33 2025/02/04 20:22:20 tb Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -156,10 +156,11 @@ BN_div_reciprocal(BIGNUM *dv, BIGNUM *rem, const BIGNUM *m, BN_RECP_CTX *recp,
                 recp->shift = i;
         }
 
-        /* d := |round(round(m / 2^BN_num_bits(N)) * recp->Nr / 2^(i - BN_num_bits(N)))|
-         *    = |round(round(m / 2^BN_num_bits(N)) * round(2^i / N) / 2^(i - BN_num_bits(N)))|
-         *   <= |(m / 2^BN_num_bits(N)) * (2^i / N) * (2^BN_num_bits(N) / 2^i)|
-         *    = |m/N|
+        /*
+         * d := |((m >> BN_num_bits(N)) * recp->Nr)     >> (i - BN_num_bits(N))|
+         *    = |((m >> BN_num_bits(N)) * (1 << i) / N) >> (i - BN_num_bits(N))|
+         *   <= |(m / 2^BN_num_bits(N)) * (2^i / N) * 2^BN_num_bits(N) / 2^i |
+         *    = |m / N|
          */
         if (!BN_rshift(a, m, recp->num_bits))
                 goto err;