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transaction: document why we mask sighash types with 0x9f 

Signed-off-by: Antoine Poinsot <darosior@protonmail.com>
Co-Authored-by: sanket1729 <sanket1729@gmail.com>
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Antoine Poinsot 2021-02-18 23:32:35 +01:00
parent 7f73d5f7db
commit 466f161e0b
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1 changed files with 6 additions and 1 deletions
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7
src/blockdata/transaction.rs
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@ -675,7 +675,12 @@ impl SigHashType {
/// Reads a 4-byte uint32 as a sighash type
pub fn from_u32(n: u32) -> SigHashType {
match n & 0x9f {
// In Bitcoin Core, the SignatureHash function will mask the (int32) value with
// 0x1f to (apparently) deactivate ACP when checking for SINGLE and NONE bits.
// We however want to be matching also against on ACP-masked ALL, SINGLE, and NONE.
// So here we re-activate ACP.
let mask = 0x1f | 0x80;
match n & mask {
// "real" sighashes
0x01 => SigHashType::All,
0x02 => SigHashType::None,