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Workaround for "stack too deep" error when preparing input to extendedKeccakToBN

pull/507/head
David Núñez 2018-10-30 13:30:28 +01:00 committed by szotov
parent 8df4634885
commit 48a0acb41e
1 changed files with 38 additions and 11 deletions
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49
nucypher/blockchain/eth/sol/source/contracts/ChallengeOverseer.sol
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@ -128,18 +128,45 @@ contract ChallengeOverseer {
{
// Compute h = hash_to_bignum(e, e1, e2, v, v1, v2, u, u1, u2)
uint256 h = Numerology.extended_keccak_to_bn(abi.encodePacked(
_capsule.pointE, // e
_cFrag.pointE1, // e1
_cFrag.proof.pointE2, // e2
_capsule.pointV, // v
_cFrag.pointV1, // v1
_cFrag.proof.pointV2, // v2
bytes1(0x02), // u (continues on next line)
bytes memory hashInput = abi.encodePacked(
// Point E
_capsule.pointE.sign,
_capsule.pointE.xCoord,
// Point E1
_cFrag.pointE1.sign,
_cFrag.pointE1.xCoord,
// Point E2
_cFrag.proof.pointE2.sign,
_cFrag.proof.pointE2.xCoord
);
hashInput = abi.encodePacked(
hashInput,
// Point V
_capsule.pointV.sign,
_capsule.pointV.xCoord,
// Point V1
_cFrag.pointV1.sign,
_cFrag.pointV1.xCoord,
// Point V2
_cFrag.proof.pointV2.sign,
_cFrag.proof.pointV2.xCoord
);
hashInput = abi.encodePacked(
hashInput,
// Point U
bytes1(0x02),
bytes32(0xef62d276f6f311573b29790b970f2c4b4e44637c0c45f0838ffdc9167a05b999),
_cFrag.proof.pointKFragCommitment, // u1
_cFrag.proof.pointKFragPok // u2
));
// Point U1
_cFrag.proof.pointKFragCommitment.sign,
_cFrag.proof.pointKFragCommitment.xCoord,
// Point U2
_cFrag.proof.pointKFragPok.sign,
_cFrag.proof.pointKFragPok.xCoord
);
uint256 h = SignatureVerifier.extendedKeccakToBN(hashInput);
//////
// Verifying equation: z*E + h*E_1 = E_2