From 8138cbea3c405e142d70b43b6c452e1738de3332 Mon Sep 17 00:00:00 2001
From: Pieter Wuille <pieter.wuille@gmail.com>
Date: Sat, 20 Sep 2014 03:13:04 +0200
Subject: Add automatic script test generation, and actual checksig tests

---
 src/key.cpp | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

(limited to 'src/key.cpp')

diff --git a/src/key.cpp b/src/key.cpp
index 8ed787654..c2251b4f2 100644
--- a/src/key.cpp
+++ b/src/key.cpp
@@ -220,7 +220,7 @@ public:
         return o2i_ECPublicKey(&pkey, &pbegin, pubkey.size()) != NULL;
     }
 
-    bool Sign(const uint256 &hash, std::vector<unsigned char>& vchSig) {
+    bool Sign(const uint256 &hash, std::vector<unsigned char>& vchSig, bool lowS) {
         vchSig.clear();
         ECDSA_SIG *sig = ECDSA_do_sign((unsigned char*)&hash, sizeof(hash), pkey);
         if (sig == NULL)
@@ -232,7 +232,7 @@ public:
         BIGNUM *halforder = BN_CTX_get(ctx);
         EC_GROUP_get_order(group, order, ctx);
         BN_rshift1(halforder, order);
-        if (BN_cmp(sig->s, halforder) > 0) {
+        if (lowS && BN_cmp(sig->s, halforder) > 0) {
             // enforce low S values, by negating the value (modulo the order) if above order/2.
             BN_sub(sig->s, order, sig->s);
         }
@@ -467,7 +467,7 @@ CPubKey CKey::GetPubKey() const {
     return pubkey;
 }
 
-bool CKey::Sign(const uint256 &hash, std::vector<unsigned char>& vchSig) const {
+bool CKey::Sign(const uint256 &hash, std::vector<unsigned char>& vchSig, bool lowS) const {
     if (!fValid)
         return false;
 #ifdef USE_SECP256K1
@@ -484,7 +484,7 @@ bool CKey::Sign(const uint256 &hash, std::vector<unsigned char>& vchSig) const {
 #else
     CECKey key;
     key.SetSecretBytes(vch);
-    return key.Sign(hash, vchSig);
+    return key.Sign(hash, vchSig, lowS);
 #endif
 }
 
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