OP_INVERT was modifying bytes in place, now they are popped, modified, and pushed back onto the stack #169
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## master #169 +/- ##
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Coverage 80.63% 80.64%
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Files 38 38
Lines 4115 4117 +2
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+ Hits 3318 3320 +2
Misses 546 546
Partials 251 251
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sirdeggen
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boecklim
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Aug 16, 2023
Signed-off-by: Darren Kellenschwiler <deggen@kschw.com> # Conflicts: # bscript/interpreter/engine_test.go
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boecklim
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Seems like it's only OP_INVERT which was causing this strange bug.
Scenario
PushTx methodology is used across a number of smart contracts. Optimized code uses a public key associated with the private key Bn(1). The unlocking script contains a complete preimage for the sake of forward enforcement among other things. That preimage has its nSequence inverted somewhere in the example script, but while it's inverted on the stack, the other items on the stack containing the same bytes are also inverted.
Fix
Rather than Peek, we Pop the byte array, clone it, invert the clone and push that on to the stack. It might not be as memory efficient, but it at leasts solves this bizarre problem.