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Merge pull request #3938

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01cc978 ringct: remove an unnecessary scalarmultBase in zeroCommit (moneromooo-monero)
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luigi1111 2018-06-20 14:51:31 -05:00
commit 34c57d071f
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GPG Key ID: F4ACA0183641E010
3 changed files with 12 additions and 4 deletions
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5
src/ringct/rctOps.cpp
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@ -134,12 +134,9 @@ namespace rct {
} }
key zeroCommit(xmr_amount amount) { key zeroCommit(xmr_amount amount) {
key mask = identity();
mask = scalarmultBase(mask);
key am = d2h(amount); key am = d2h(amount);
key bH = scalarmultH(am); key bH = scalarmultH(am);
addKeys(mask, mask, bH); return addKeys(G, bH);
return mask;
} }
key commit(xmr_amount amount, const key &mask) { key commit(xmr_amount amount, const key &mask) {

1
src/ringct/rctOps.h
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@ -62,6 +62,7 @@ namespace rct {
static const key Z = { {0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 } }; static const key Z = { {0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 } };
static const key I = { {0x01, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 } }; static const key I = { {0x01, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 } };
static const key L = { {0xed, 0xd3, 0xf5, 0x5c, 0x1a, 0x63, 0x12, 0x58, 0xd6, 0x9c, 0xf7, 0xa2, 0xde, 0xf9, 0xde, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10 } }; static const key L = { {0xed, 0xd3, 0xf5, 0x5c, 0x1a, 0x63, 0x12, 0x58, 0xd6, 0x9c, 0xf7, 0xa2, 0xde, 0xf9, 0xde, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10 } };
static const key G = { {0x58, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66 } };
//Creates a zero scalar //Creates a zero scalar
inline key zero() { return Z; } inline key zero() { return Z; }

10
tests/unit_tests/ringct.cpp
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@ -1061,3 +1061,13 @@ TEST(ringct, key_ostream)
out.str() out.str()
); );
} }
TEST(ringct, zeroCommmit)
{
static const uint64_t amount = crypto::rand<uint64_t>();
const rct::key z = rct::zeroCommit(amount);
const rct::key a = rct::scalarmultBase(rct::identity());
const rct::key b = rct::scalarmultH(rct::d2h(amount));
const rct::key manual = rct::addKeys(a, b);
ASSERT_EQ(z, manual);
}