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ringct: add functions to commit to an amount

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One to commit to an amount with zero key (for use with fake
commitments for pre-rct outputs), and one with an arbitrary
key (for rct outputs).
This commit is contained in:
moneromooo-monero 2016-06-15 22:47:09 +01:00
parent cc7f449d57
commit dee42d6dac
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GPG key ID: 686F07454D6CEFC3
2 changed files with 21 additions and 0 deletions
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17
src/ringct/rctOps.cpp
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@ -170,6 +170,23 @@ namespace rct {
return make_tuple(sk, pk);
}
key zeroCommit(xmr_amount amount) {
key mask = identity();
mask = scalarmultBase(mask);
key am = d2h(amount);
key bH = scalarmultH(am);
addKeys(mask, mask, bH);
return mask;
}
key commit(xmr_amount amount, key mask) {
mask = scalarmultBase(mask);
key am = d2h(amount);
key bH = scalarmultH(am);
addKeys(mask, mask, bH);
return mask;
}
//generates a random uint long long (for testing)
xmr_amount randXmrAmount(xmr_amount upperlimit) {
return h2d(skGen()) % (upperlimit);

4
src/ringct/rctOps.h
View file

@ -96,6 +96,10 @@ namespace rct {
tuple<ctkey, ctkey> ctskpkGen(xmr_amount amount);
//this one is mainly for testing, can take arbitrary amounts..
tuple<ctkey, ctkey> ctskpkGen(key bH);
// make a pedersen commitment with given key
key commit(xmr_amount amount, key mask);
// make a pedersen commitment with zero key
key zeroCommit(xmr_amount amount);
//generates a random uint long long
xmr_amount randXmrAmount(xmr_amount upperlimit);