File 0001-Merge-to-1.0.2-DSA-mod-inverse-fix.patch of Package openssl-1_0_0.10508

From ebf65dbe1a67682d7e1f58db9c53ef737fb37f32 Mon Sep 17 00:00:00 2001
From: Pauli <paul.dale@oracle.com>
Date: Mon, 29 Oct 2018 07:18:09 +1000
Subject: [PATCH] Merge to 1.0.2: DSA mod inverse fix.

There is a side channel attack against the division used to calculate one of
the modulo inverses in the DSA algorithm. This change takes advantage of the
primality of the modulo and Fermat's little theorem to calculate the inverse
without leaking information.

Thanks to Samuel Weiser for finding and reporting this.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/7512)
---
 crypto/dsa/dsa_ossl.c | 34 ++++++++++++++++++++++++++++++++--
 1 file changed, 32 insertions(+), 2 deletions(-)

Index: openssl-1.0.2p/crypto/dsa/dsa_ossl.c
===================================================================
--- openssl-1.0.2p.orig/crypto/dsa/dsa_ossl.c	2018-11-23 16:04:33.334575610 +0100
+++ openssl-1.0.2p/crypto/dsa/dsa_ossl.c	2018-11-23 16:04:42.062625435 +0100
@@ -76,6 +76,8 @@ static int dsa_do_verify(const unsigned
                          DSA_SIG *sig, DSA *dsa);
 static int dsa_init(DSA *dsa);
 static int dsa_finish(DSA *dsa);
+static BIGNUM *dsa_mod_inverse_fermat(const BIGNUM *k, const BIGNUM *q,
+                                      BN_CTX *ctx);
 
 static DSA_METHOD openssl_dsa_meth = {
     "OpenSSL DSA method",
@@ -349,8 +351,8 @@ static int dsa_sign_setup(DSA *dsa, BN_C
     if (!BN_mod(r, r, dsa->q, ctx))
         goto err;
 
-    /* Compute  part of 's = inv(k) (m + xr) mod q' */
-    if ((kinv = BN_mod_inverse(NULL, &k, dsa->q, ctx)) == NULL)
+    /* Compute part of 's = inv(k) (m + xr) mod q' */
+    if ((kinv = dsa_mod_inverse_fermat(&k, dsa->q, ctx)) == NULL)
         goto err;
 
     if (*kinvp != NULL)
@@ -499,3 +501,31 @@ static int dsa_finish(DSA *dsa)
         BN_MONT_CTX_free(dsa->method_mont_p);
     return (1);
 }
+
+/*
+ * Compute the inverse of k modulo q.
+ * Since q is prime, Fermat's Little Theorem applies, which reduces this to
+ * mod-exp operation.  Both the exponent and modulus are public information
+ * so a mod-exp that doesn't leak the base is sufficient.  A newly allocated
+ * BIGNUM is returned which the caller must free.
+ */
+static BIGNUM *dsa_mod_inverse_fermat(const BIGNUM *k, const BIGNUM *q,
+                                      BN_CTX *ctx)
+{
+    BIGNUM *res = NULL;
+    BIGNUM *r, e;
+
+    if ((r = BN_new()) == NULL)
+        return NULL;
+
+    BN_init(&e);
+
+    if (BN_set_word(r, 2)
+            && BN_sub(&e, q, r)
+            && BN_mod_exp_mont(r, k, &e, q, ctx, NULL))
+        res = r;
+    else
+        BN_free(r);
+    BN_free(&e);
+    return res;
+}