src/script/sign.h

   1 // Copyright (c) 2009-2010 Satoshi Nakamoto
   2 // Copyright (c) 2009-2016 The Bitcoin Core developers
   3 // Distributed under the MIT software license, see the accompanying
   4 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
   5
   6 #ifndef BITCOIN_SCRIPT_SIGN_H
   7 #define BITCOIN_SCRIPT_SIGN_H
   8
   9 #include "script/interpreter.h"
  10
  11 class CKeyID;
  12 class CKeyStore;
  13 class CScript;
  14 class CTransaction;
  15
  16 struct CMutableTransaction;
  17
  18 /** Virtual base class for signature creators. */
  19 class BaseSignatureCreator {
  20 protected:
  21     const CKeyStore* keystore;
  22
  23 public:
  24     explicit BaseSignatureCreator(const CKeyStore* keystoreIn) : keystore(keystoreIn) {}
  25     const CKeyStore& KeyStore() const { return *keystore; };
  26     virtual ~BaseSignatureCreator() {}
  27     virtual const BaseSignatureChecker& Checker() const =0;
  28
  29     /** Create a singular (non-script) signature. */
  30     virtual bool CreateSig(std::vector<unsigned char>& vchSig, const CKeyID& keyid, const CScript& scriptCode, SigVersion sigversion) const =0;
  31 };
  32
  33 /** A signature creator for transactions. */
  34 class TransactionSignatureCreator : public BaseSignatureCreator {
  35     const CTransaction* txTo;
  36     unsigned int nIn;
  37     int nHashType;
  38     CAmount amount;
  39     const TransactionSignatureChecker checker;
  40
  41 public:
  42     TransactionSignatureCreator(const CKeyStore* keystoreIn, const CTransaction* txToIn, unsigned int nInIn, const CAmount& amountIn, int nHashTypeIn=SIGHASH_ALL);
  43     const BaseSignatureChecker& Checker() const override { return checker; }
  44     bool CreateSig(std::vector<unsigned char>& vchSig, const CKeyID& keyid, const CScript& scriptCode, SigVersion sigversion) const override;
  45 };
  46
  47 class MutableTransactionSignatureCreator : public TransactionSignatureCreator {
  48     CTransaction tx;
  49
  50 public:
  51     MutableTransactionSignatureCreator(const CKeyStore* keystoreIn, const CMutableTransaction* txToIn, unsigned int nInIn, const CAmount& amountIn, int nHashTypeIn) : TransactionSignatureCreator(keystoreIn, &tx, nInIn, amountIn, nHashTypeIn), tx(*txToIn) {}
  52 };
  53
  54 /** A signature creator that just produces 72-byte empty signatures. */
  55 class DummySignatureCreator : public BaseSignatureCreator {
  56 public:
  57     explicit DummySignatureCreator(const CKeyStore* keystoreIn) : BaseSignatureCreator(keystoreIn) {}
  58     const BaseSignatureChecker& Checker() const override;
  59     bool CreateSig(std::vector<unsigned char>& vchSig, const CKeyID& keyid, const CScript& scriptCode, SigVersion sigversion) const override;
  60 };
  61
  62 struct SignatureData {
  63     CScript scriptSig;
  64     CScriptWitness scriptWitness;
  65
  66     SignatureData() {}
  67     explicit SignatureData(const CScript& script) : scriptSig(script) {}
  68 };
  69
  70 /** Produce a script signature using a generic signature creator. */
  71 bool ProduceSignature(const BaseSignatureCreator& creator, const CScript& scriptPubKey, SignatureData& sigdata);
  72
  73 /** Produce a script signature for a transaction. */
  74 bool SignSignature(const CKeyStore &keystore, const CScript& fromPubKey, CMutableTransaction& txTo, unsigned int nIn, const CAmount& amount, int nHashType);
  75 bool SignSignature(const CKeyStore& keystore, const CTransaction& txFrom, CMutableTransaction& txTo, unsigned int nIn, int nHashType);
  76
  77 /** Combine two script signatures using a generic signature checker, intelligently, possibly with OP_0 placeholders. */
  78 SignatureData CombineSignatures(const CScript& scriptPubKey, const BaseSignatureChecker& checker, const SignatureData& scriptSig1, const SignatureData& scriptSig2);
  79
  80 /** Extract signature data from a transaction, and insert it. */
  81 SignatureData DataFromTransaction(const CMutableTransaction& tx, unsigned int nIn);
  82 void UpdateTransaction(CMutableTransaction& tx, unsigned int nIn, const SignatureData& data);
  83
  84 #endif // BITCOIN_SCRIPT_SIGN_H