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| author | Wladimir J. van der Laan <laanwj@gmail.com> | 2015-03-11 14:19:28 +0000 |
|---|---|---|
| committer | Wladimir J. van der Laan <laanwj@gmail.com> | 2015-03-11 14:19:28 +0000 |
| commit | ced361de1d47c71e967430e17339be520b71bb1a (patch) | |
| tree | 647efe42d3673907123a13494b74b59ca50791fb /bip-0062.mediawiki | |
| parent | c3d6df15cc5ccd5ac23c3f12767f6d2ee3fc350c (diff) | |
| parent | cea602ef6c9b68483a696c3358f010f46915afe4 (diff) | |
| download | bips-ced361de1d47c71e967430e17339be520b71bb1a.tar.xz | |
Merge pull request #132 from petertodd/bip62-compact-validly-encoded-invalid-sigs
BIP62: Make OP_0 a validly encoded signature
Diffstat (limited to 'bip-0062.mediawiki')
| -rw-r--r-- | bip-0062.mediawiki | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/bip-0062.mediawiki b/bip-0062.mediawiki index 99ff605..4846abf 100644 --- a/bip-0062.mediawiki +++ b/bip-0062.mediawiki @@ -38,7 +38,7 @@ The first six and part of the seventh can be fixed by extra consensus rules, but ===New rules=== Seven extra rules are introduced, to combat exactly the seven first sources of malleability listed above: -# '''Canonically encoded ECDSA signatures''' An ECDSA signature passed to OP_CHECKSIG, OP_CHECKSIGVERIFY, OP_CHECKMULTISIG or OP_CHECKMULTISIGVERIFY must be encoded using strict DER encoding. Doing a verification with a non-DER signature makes the entire script evaluate to False (not just the signature verification). See reference: [[#der-encoding|DER encoding]]. +# '''Canonically encoded ECDSA signatures''' An ECDSA signature passed to OP_CHECKSIG, OP_CHECKSIGVERIFY, OP_CHECKMULTISIG or OP_CHECKMULTISIGVERIFY must be encoded using strict DER encoding. To provide a compact way to delibrately create an invalid signature for with OP_CHECKSIG and OP_CHECKMULTISIG the empty byte array (the result of OP_0) is also allowed. Doing a verification with a non-DER signature makes the entire script evaluate to False (not just the signature verification). See reference: [[#der-encoding|DER encoding]]. # '''Non-push operations in scriptSig''' Only data pushes are allowed in scriptSig. Evaluating any other operation makes the script evaluate to false. See reference: [[#push-operators|Push operators]]. # '''Push operations in scriptSig of non-standard size type''' The smallest possible push operation must be used when possible. Pushing data using an operation that could be encoded in a shorter way makes the script evaluate to false. See reference: [[#push-operators|Push operators]]. # '''Zero-padded number pushes''' Any time a script opcode consumes a stack value that is interpreted as a number, it must be encoded in its shortest possible form. 'Negative zero' is not allowed. See reference: [[#numbers|Numbers]]. |