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Use modulo instead of and operation to validate the proof size #101

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Use modulo instead of and operation to validate the proof size #101

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953afcc
Use modulo instead of and operation to validate the proof size
mininny Dec 10, 2024
c3b3996
Check for proof size % 60*32
mininny Jan 6, 2025
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2 changes: 1 addition & 1 deletion rvgo/slow/vm.go
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Original file line number Diff line number Diff line change
Expand Up @@ -129,7 +129,7 @@ func Step(calldata []byte, po PreimageOracle) (stateHash common.Hash, outErr err

proofContentOffset := shortToU64(uint16(stateContentOffset) + paddedStateSize + 32)

if and(b32asBEWord(calldataload(shortToU64(uint16(stateContentOffset)+paddedStateSize))), shortToU256(60-1)) != (U256{}) {
if mod(b32asBEWord(calldataload(shortToU64(uint16(stateContentOffset)+paddedStateSize))), shortToU256(60*32)) != toU256(0) {
// proof offset must be stateContentOffset+paddedStateSize+32
// proof size: 64-5+1=60 * 32 byte leaf,
// but multiple memProof can be used, so the proofSize must be a multiple of 60
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