-
Notifications
You must be signed in to change notification settings - Fork 50
/
UAOSRing.sol
50 lines (44 loc) · 1.12 KB
/
UAOSRing.sol
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
pragma solidity ^0.4.14;
import "./Curve.sol";
// https://eprint.iacr.org/2004/027.pdf
library UAOSRing
{
using Curve for Curve.G1Point;
function RingLink( Curve.G1Point Y, Curve.G1Point M, Curve.G1Point tagpoint, uint256 s, uint256 c )
internal constant
returns (uint256)
{
var a = Curve.g1add(Curve.g1mul(Curve.P1(), s), Curve.g1mul(Y, c));
var b = Curve.g1add(Curve.g1mul(M, s), Curve.g1mul(tagpoint, c));
return uint256(keccak256(
tagpoint.X, tagpoint.Y,
a.X, a.Y,
b.X, b.Y
));
}
function Verify( uint256[8] pubkeys, uint256[2] tag, uint256[4] tees, uint256 seed, uint256 message )
public constant
returns (bool)
{
require( pubkeys.length % 2 == 0 );
require( pubkeys.length > 0 );
var M = Curve.HashToPoint(message);
var h = uint256(keccak256(M.X, M.Y, tag[0], tag[1]));
var tagpoint = Curve.G1Point(tag[0], tag[1]);
uint256 c = seed;
for( uint256 i = 0; i < (pubkeys.length / 2); i++ )
{
uint256 j = i * 2;
c = uint256(keccak256(
h,
RingLink(
Curve.G1Point(pubkeys[j], pubkeys[j+1]),
M,
tagpoint,
tees[i],
c
)));
}
return c == seed;
}
}