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Implement Tapscript script validation rules (BIP 342)

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This adds a new `SigVersion::TAPSCRIPT`, makes the necessary interpreter
changes to make it implement BIP342, and uses them for leaf version 0xc0
in Taproot script path spends.
This commit is contained in:
Johnson Lau 2020-09-11 14:34:02 -07:00 • committed by Pieter Wuille
parent 330de894a9
commit 72422ce396
6 changed files with 234 additions and 19 deletions
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10
src/script/script_error.cpp
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@ -75,6 +75,10 @@ std::string ScriptErrorString(const ScriptError serror)
return "Witness version reserved for soft-fork upgrades";
case SCRIPT_ERR_DISCOURAGE_UPGRADABLE_TAPROOT_VERSION:
return "Taproot version reserved for soft-fork upgrades";
case SCRIPT_ERR_DISCOURAGE_OP_SUCCESS:
return "OP_SUCCESSx reserved for soft-fork upgrades";
case SCRIPT_ERR_DISCOURAGE_UPGRADABLE_PUBKEYTYPE:
return "Public key version reserved for soft-fork upgrades";
case SCRIPT_ERR_PUBKEYTYPE:
return "Public key is neither compressed or uncompressed";
case SCRIPT_ERR_CLEANSTACK:
@ -101,6 +105,12 @@ std::string ScriptErrorString(const ScriptError serror)
return "Invalid Schnorr signature";
case SCRIPT_ERR_TAPROOT_WRONG_CONTROL_SIZE:
return "Invalid Taproot control block size";
case SCRIPT_ERR_TAPSCRIPT_VALIDATION_WEIGHT:
return "Too much signature validation relative to witness weight";
case SCRIPT_ERR_TAPSCRIPT_CHECKMULTISIG:
return "OP_CHECKMULTISIG(VERIFY) is not available in tapscript";
case SCRIPT_ERR_TAPSCRIPT_MINIMALIF:
return "OP_IF/NOTIF argument must be minimal in tapscript";
case SCRIPT_ERR_OP_CODESEPARATOR:
return "Using OP_CODESEPARATOR in non-witness script";
case SCRIPT_ERR_SIG_FINDANDDELETE: