diff options
Diffstat (limited to 'src/script')
-rw-r--r-- | src/script/sign.cpp | 48 | ||||
-rw-r--r-- | src/script/sign.h | 4 |
2 files changed, 52 insertions, 0 deletions
diff --git a/src/script/sign.cpp b/src/script/sign.cpp index 58eae3ce96..a8abd347da 100644 --- a/src/script/sign.cpp +++ b/src/script/sign.cpp @@ -465,3 +465,51 @@ bool IsSegWitOutput(const SigningProvider& provider, const CScript& script) } return false; } + +bool SignTransaction(CMutableTransaction& mtx, const SigningProvider* keystore, const std::map<COutPoint, Coin>& coins, int nHashType, std::map<int, std::string>& input_errors) +{ + bool fHashSingle = ((nHashType & ~SIGHASH_ANYONECANPAY) == SIGHASH_SINGLE); + + // Use CTransaction for the constant parts of the + // transaction to avoid rehashing. + const CTransaction txConst(mtx); + // Sign what we can: + for (unsigned int i = 0; i < mtx.vin.size(); i++) { + CTxIn& txin = mtx.vin[i]; + auto coin = coins.find(txin.prevout); + if (coin == coins.end() || coin->second.IsSpent()) { + input_errors[i] = "Input not found or already spent"; + continue; + } + const CScript& prevPubKey = coin->second.out.scriptPubKey; + const CAmount& amount = coin->second.out.nValue; + + SignatureData sigdata = DataFromTransaction(mtx, i, coin->second.out); + // Only sign SIGHASH_SINGLE if there's a corresponding output: + if (!fHashSingle || (i < mtx.vout.size())) { + ProduceSignature(*keystore, MutableTransactionSignatureCreator(&mtx, i, amount, nHashType), prevPubKey, sigdata); + } + + UpdateInput(txin, sigdata); + + // amount must be specified for valid segwit signature + if (amount == MAX_MONEY && !txin.scriptWitness.IsNull()) { + input_errors[i] = "Missing amount"; + continue; + } + + ScriptError serror = SCRIPT_ERR_OK; + if (!VerifyScript(txin.scriptSig, prevPubKey, &txin.scriptWitness, STANDARD_SCRIPT_VERIFY_FLAGS, TransactionSignatureChecker(&txConst, i, amount), &serror)) { + if (serror == SCRIPT_ERR_INVALID_STACK_OPERATION) { + // Unable to sign input and verification failed (possible attempt to partially sign). + input_errors[i] = "Unable to sign input, invalid stack size (possibly missing key)"; + } else if (serror == SCRIPT_ERR_SIG_NULLFAIL) { + // Verification failed (possibly due to insufficient signatures). + input_errors[i] = "CHECK(MULTI)SIG failing with non-zero signature (possibly need more signatures)"; + } else { + input_errors[i] = ScriptErrorString(serror); + } + } + } + return input_errors.empty(); +} diff --git a/src/script/sign.h b/src/script/sign.h index 033c9ba19e..f03af0713f 100644 --- a/src/script/sign.h +++ b/src/script/sign.h @@ -6,6 +6,7 @@ #ifndef BITCOIN_SCRIPT_SIGN_H #define BITCOIN_SCRIPT_SIGN_H +#include <coins.h> #include <hash.h> #include <pubkey.h> #include <script/interpreter.h> @@ -168,4 +169,7 @@ bool IsSolvable(const SigningProvider& provider, const CScript& script); /** Check whether a scriptPubKey is known to be segwit. */ bool IsSegWitOutput(const SigningProvider& provider, const CScript& script); +/** Sign the CMutableTransaction */ +bool SignTransaction(CMutableTransaction& mtx, const SigningProvider* provider, const std::map<COutPoint, Coin>& coins, int sighash, std::map<int, std::string>& input_errors); + #endif // BITCOIN_SCRIPT_SIGN_H |