From: simon <simon@cda61777-01e9-0310-a592-d414129be87e>
Date: Sat, 28 Jun 2003 14:11:28 +0000 (+0000)
Subject: Failure to set multipliers[NPRIMES] was rendering the input-modulus
X-Git-Url: https://git.distorted.org.uk/u/mdw/putty/commitdiff_plain/f26b3d771ea81495859eb4d899af447fc9b6b3e5

Failure to set multipliers[NPRIMES] was rendering the input-modulus
feature (make sure your prime is not congruent to Foo mod Bar)
largely ineffective. As a result, RSA keys were being generated
every so often with at least one prime congruent to 1 mod 37,
causing modinv(37, phi(n)) to divide by zero, and rightly so. I
believe this fixes `puttygen-zero-div'.


git-svn-id: svn://svn.tartarus.org/sgt/putty@3316 cda61777-01e9-0310-a592-d414129be87e
---

diff --git a/sshprime.c b/sshprime.c
index b48ce1a3..4d79aacd 100644
--- a/sshprime.c
+++ b/sshprime.c
@@ -1255,6 +1255,10 @@ Bignum primegen(int bits, int modulus, int residue, Bignum factor,
     moduli[NPRIMES] = modulus;
     residues[NPRIMES] = (bignum_mod_short(p, (unsigned short) modulus)
 			 + modulus - residue);
+    if (factor)
+	multipliers[NPRIMES] = bignum_mod_short(factor, modulus);
+    else
+	multipliers[NPRIMES] = 1;
     delta = 0;
     while (1) {
 	for (i = 0; i < (sizeof(moduli) / sizeof(*moduli)); i++)