diff options
Diffstat (limited to 'bip-0342.mediawiki')
| -rw-r--r-- | bip-0342.mediawiki | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/bip-0342.mediawiki b/bip-0342.mediawiki index 87e07ae..bbefcaa 100644 --- a/bip-0342.mediawiki +++ b/bip-0342.mediawiki @@ -104,13 +104,17 @@ The following rules apply to <code>OP_CHECKSIG</code>, <code>OP_CHECKSIGVERIFY</ *** For <code>OP_CHECKSIG</code>, a 1-byte value <code>0x01</code> is pushed onto the stack. *** For <code>OP_CHECKSIGADD</code>, a <code>CScriptNum</code> with value of <code>n + 1</code> is pushed onto the stack. +===Common Signature Message Extension=== + +We define the tapscript message extension ''ext'' to [[bip-0341.mediawiki#common-signature-message|BIP341 Common Signature Message]], indicated by ''ext_flag = 1'': +* ''tapleaf_hash'' (32): the tapleaf hash as defined in [[bip-0341.mediawiki#design|BIP341]] +* ''key_version'' (1): a constant value ''0x00'' representing the current version of public keys in the tapscript signature opcode execution. +* ''codesep_pos'' (4): the opcode position of the last executed <code>OP_CODESEPARATOR</code> before the currently executed signature opcode, with the value in little endian (or ''0xffffffff'' if none executed). The first opcode in a script has a position of 0. A multi-byte push opcode is counted as one opcode, regardless of the size of data being pushed. Opcodes in parsed but unexecuted branches count towards this value as well. + ===Signature validation=== To validate a signature ''sig'' with public key ''p'': -* Compute the tapscript message extension ''ext'', consisting of the concatenation of: -** ''tapleaf_hash'' (32): the tapleaf hash as defined in [[bip-0341.mediawiki#design|BIP341]] -** ''key_version'' (1): a constant value ''0x00'' representing the current version of public keys in the tapscript signature opcode execution. -** ''codesep_pos'' (4): the opcode position of the last executed <code>OP_CODESEPARATOR</code> before the currently executed signature opcode, with the value in little endian (or ''0xffffffff'' if none executed). The first opcode in a script has a position of 0. A multi-byte push opcode is counted as one opcode, regardless of the size of data being pushed. Opcodes in parsed but unexecuted branches count towards this value as well. +* Compute the tapscript message extension ''ext'' described above. * If the ''sig'' is 64 bytes long, return ''Verify(p, hash<sub>TapSighash</sub>(0x00 || SigMsg(0x00, 1) || ext), sig)'', where ''Verify'' is defined in [[bip-0340.mediawiki#design|BIP340]]. * If the ''sig'' is 65 bytes long, return ''sig[64] ≠ 0x00 and Verify(p, hash<sub>TapSighash</sub>(0x00 || SigMsg(sig[64], 1) || ext), sig[0:64])''. * Otherwise, fail. |