diff options
Diffstat (limited to 'src/script/interpreter.cpp')
-rw-r--r-- | src/script/interpreter.cpp | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/src/script/interpreter.cpp b/src/script/interpreter.cpp index 3c3f92fe46..2cdff7ee57 100644 --- a/src/script/interpreter.cpp +++ b/src/script/interpreter.cpp @@ -1,5 +1,5 @@ // Copyright (c) 2009-2010 Satoshi Nakamoto -// Copyright (c) 2009-2016 The Bitcoin Core developers +// Copyright (c) 2009-2017 The Bitcoin Core developers // Distributed under the MIT software license, see the accompanying // file COPYING or http://www.opensource.org/licenses/mit-license.php. @@ -173,7 +173,13 @@ bool static IsLowDERSignature(const valtype &vchSig, ScriptError* serror) { if (!IsValidSignatureEncoding(vchSig)) { return set_error(serror, SCRIPT_ERR_SIG_DER); } + // https://bitcoin.stackexchange.com/a/12556: + // Also note that inside transaction signatures, an extra hashtype byte + // follows the actual signature data. std::vector<unsigned char> vchSigCopy(vchSig.begin(), vchSig.begin() + vchSig.size() - 1); + // If the S value is above the order of the curve divided by two, its + // complement modulo the order could have been used instead, which is + // one byte shorter when encoded correctly. if (!CPubKey::CheckLowS(vchSigCopy)) { return set_error(serror, SCRIPT_ERR_SIG_HIGH_S); } |