diff options
Diffstat (limited to 'src/script')
-rw-r--r-- | src/script/interpreter.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/script/interpreter.cpp b/src/script/interpreter.cpp index 8a121774a0..39e06f4a51 100644 --- a/src/script/interpreter.cpp +++ b/src/script/interpreter.cpp @@ -174,7 +174,13 @@ 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); } |