bolt11: Don't push the size of the witness program for v1+ scripts #6435
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For non-v0 witness programs we weren't stripping the data push byte before writing into the fallback address. According to BIP14, all witness scripts will be data pushes (up to 40-bytes) so trimming the datapush byte should be kosher. From BIP141: A scriptPubKey (or redeemScript as defined in BIP16/P2SH) that consists of a 1-byte push opcode (for 0 to 16) followed by a data push between 2 and 40 bytes gets a new special meaning. The value of the first push is called the "version byte". The following byte vector pushed is called the "witness program". Changelog-Fixed: Adding a >0 version witness program to a fallback address now is *just* the witness program, as per bolt11 spec
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vincenzopalazzo
suggested changes
Jul 25, 2023
Comment on lines
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+425
| if (version == 1 && tal_count(f) != 32) { | ||
| return tal_fmt(b11, | ||
| "f: witness v1 bad length %zu", | ||
| tal_count(f)); | ||
| } | ||
| if (tal_count(f) > 40) { | ||
| return tal_fmt(b11, | ||
| "f: witness v%ld bad length %zu", | ||
| version, | ||
| tal_count(f)); | ||
| } |
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we can avoid the {....} here
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For non-v0 witness programs we weren't stripping the data push byte before writing into the fallback address.
According to BIP14, all witness scripts will be data pushes (up to 40-bytes) so trimming the datapush byte should be kosher.
From BIP141:
Changelog-Fixed: Adding a >0 version witness program to a fallback address now is just the witness program, as per bolt11 spec