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remove dependencies on mathematics

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This commit is contained in:
Tadge Dryja 2015-12-21 22:36:28 -05:00
parent 36ec5b4927
commit fbc5f37d0b
1 changed files with 6 additions and 0 deletions
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6
revocation/shachain.go
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@ -72,6 +72,12 @@ func derive(from, to uint64, startingHash [32]byte) [32]byte {
numBranches := from ^ to numBranches := from ^ to
toDerive := uint64(math.Log2(float64(numBranches))) // uh..... toDerive := uint64(math.Log2(float64(numBranches))) // uh.....
// math? floats? nahhh! :) bit-flipp-y way to do it:
for toDerive = 0; numBranches>>toDerive > 0; toDerive++ {
}
// ^^^this rounds up instead of down, may be off by 1?
toDerive-- // needed?
for i := int(toDerive - 1); i >= 0; i-- { for i := int(toDerive - 1); i >= 0; i-- {
if (numBranches>>uint(i))&1 == 1 { if (numBranches>>uint(i))&1 == 1 {
// Flip the ith bit, then hash the current state to // Flip the ith bit, then hash the current state to