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From 9425e16437439e68c7d96abef922167d68fafaff Mon Sep 17 00:00:00 2001
From: Jeffrey Walton <noloader@gmail.com>
Date: Sat, 27 Jun 2015 17:56:01 -0400
Subject: [PATCH] Fix for CVE-2015-2141. Thanks to Evgeny Sidorov for
reporting. Squaring to satisfy Jacobi requirements suggested by JPM.
---
rw.cpp | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/rw.cpp b/rw.cpp
index cdd9f2d..0b9318b 100644
--- a/rw.cpp
+++ b/rw.cpp
@@ -126,10 +126,16 @@ Integer InvertibleRWFunction::CalculateInverse(RandomNumberGenerator &rng, const
DoQuickSanityCheck();
ModularArithmetic modn(m_n);
Integer r, rInv;
- do { // do this in a loop for people using small numbers for testing
+
+ // do this in a loop for people using small numbers for testing
+ do {
r.Randomize(rng, Integer::One(), m_n - Integer::One());
+ // Fix for CVE-2015-2141. Thanks to Evgeny Sidorov for reporting.
+ // Squaring to satisfy Jacobi requirements suggested by JPM.
+ r = modn.Square(r);
rInv = modn.MultiplicativeInverse(r);
} while (rInv.IsZero());
+
Integer re = modn.Square(r);
re = modn.Multiply(re, x); // blind
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