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consensus: fail early on pow check when target > 256 bits.

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This commit is contained in:
Christopher Jeffrey 2018-07-04 14:30:18 -07:00
parent 05c38853d7
commit b6d067ec93
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1 changed files with 3 additions and 0 deletions
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lib/protocol/consensus.js
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@ -323,6 +323,9 @@ exports.verifyPOW = function verifyPOW(hash, bits) {
if (target.isNeg() || target.isZero())
return false;
if (target.bitLength() > 256)
return false;
const num = new BN(hash, 'le');
if (num.gt(target))