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@@ -12,23 +12,23 @@ contract P256Test is Test {
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function testVerify(bytes32 digest, uint256 seed) public {
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uint256 privateKey = _asPrivateKey(seed);
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- (bytes32 x, bytes32 y) = P256PublicKey.getPublicKey(privateKey);
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+ (uint256 x, uint256 y) = vm.publicKeyP256(privateKey);
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(bytes32 r, bytes32 s) = vm.signP256(privateKey, digest);
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s = _ensureLowerS(s);
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- assertTrue(P256.verify(digest, r, s, x, y));
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- assertTrue(P256.verifySolidity(digest, r, s, x, y));
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+ assertTrue(P256.verify(digest, r, s, bytes32(x), bytes32(y)));
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+ assertTrue(P256.verifySolidity(digest, r, s, bytes32(x), bytes32(y)));
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}
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/// forge-config: default.fuzz.runs = 512
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function testRecover(bytes32 digest, uint256 seed) public {
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uint256 privateKey = _asPrivateKey(seed);
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- (bytes32 x, bytes32 y) = P256PublicKey.getPublicKey(privateKey);
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+ (uint256 x, uint256 y) = vm.publicKeyP256(privateKey);
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(bytes32 r, bytes32 s) = vm.signP256(privateKey, digest);
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s = _ensureLowerS(s);
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(bytes32 qx0, bytes32 qy0) = P256.recovery(digest, 0, r, s);
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(bytes32 qx1, bytes32 qy1) = P256.recovery(digest, 1, r, s);
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- assertTrue((qx0 == x && qy0 == y) || (qx1 == x && qy1 == y));
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+ assertTrue((qx0 == bytes32(x) && qy0 == bytes32(y)) || (qx1 == bytes32(x) && qy1 == bytes32(y)));
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}
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function _asPrivateKey(uint256 seed) private pure returns (uint256) {
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@@ -42,98 +42,3 @@ contract P256Test is Test {
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}
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}
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}
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-
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-/**
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- * @dev Library to derive P256 public key from private key
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- * Should be removed if Foundry adds this functionality
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- * See https://github.com/foundry-rs/foundry/issues/7908
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- */
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-library P256PublicKey {
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- function getPublicKey(uint256 privateKey) internal view returns (bytes32, bytes32) {
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- (uint256 x, uint256 y, uint256 z) = _jMult(P256.GX, P256.GY, 1, privateKey);
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- return _affineFromJacobian(x, y, z);
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- }
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-
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- function _jMult(
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- uint256 x,
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- uint256 y,
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- uint256 z,
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- uint256 k
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- ) private pure returns (uint256 rx, uint256 ry, uint256 rz) {
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- unchecked {
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- for (uint256 i = 0; i < 256; ++i) {
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- if (rz > 0) {
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- (rx, ry, rz) = _jDouble(rx, ry, rz);
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- }
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- if (k >> 255 > 0) {
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- if (rz == 0) {
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- (rx, ry, rz) = (x, y, z);
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- } else {
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- (rx, ry, rz) = _jAdd(rx, ry, rz, x, y, z);
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- }
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- }
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- k <<= 1;
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- }
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- }
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- }
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-
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- /// From P256.sol
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-
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- function _affineFromJacobian(uint256 jx, uint256 jy, uint256 jz) private view returns (bytes32 ax, bytes32 ay) {
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- if (jz == 0) return (0, 0);
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- uint256 zinv = Math.invModPrime(jz, P256.P);
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- uint256 zzinv = mulmod(zinv, zinv, P256.P);
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- uint256 zzzinv = mulmod(zzinv, zinv, P256.P);
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- ax = bytes32(mulmod(jx, zzinv, P256.P));
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- ay = bytes32(mulmod(jy, zzzinv, P256.P));
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- }
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-
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- function _jDouble(uint256 x, uint256 y, uint256 z) private pure returns (uint256 rx, uint256 ry, uint256 rz) {
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- uint256 p = P256.P;
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- uint256 a = P256.A;
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- assembly ("memory-safe") {
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- let yy := mulmod(y, y, p)
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- let zz := mulmod(z, z, p)
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- let s := mulmod(4, mulmod(x, yy, p), p) // s = 4*x*y²
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- let m := addmod(mulmod(3, mulmod(x, x, p), p), mulmod(a, mulmod(zz, zz, p), p), p) // m = 3*x²+a*z⁴
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- let t := addmod(mulmod(m, m, p), sub(p, mulmod(2, s, p)), p) // t = m²-2*s
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-
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- // x' = t
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- rx := t
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- // y' = m*(s-t)-8*y⁴
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- ry := addmod(mulmod(m, addmod(s, sub(p, t), p), p), sub(p, mulmod(8, mulmod(yy, yy, p), p)), p)
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- // z' = 2*y*z
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- rz := mulmod(2, mulmod(y, z, p), p)
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- }
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- }
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-
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- function _jAdd(
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- uint256 x1,
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- uint256 y1,
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- uint256 z1,
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- uint256 x2,
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- uint256 y2,
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- uint256 z2
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- ) private pure returns (uint256 rx, uint256 ry, uint256 rz) {
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- uint256 p = P256.P;
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- assembly ("memory-safe") {
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- let zz1 := mulmod(z1, z1, p) // zz1 = z1²
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- let zz2 := mulmod(z2, z2, p) // zz2 = z2²
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- let u1 := mulmod(x1, zz2, p) // u1 = x1*z2²
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- let u2 := mulmod(x2, zz1, p) // u2 = x2*z1²
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- let s1 := mulmod(y1, mulmod(zz2, z2, p), p) // s1 = y1*z2³
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- let s2 := mulmod(y2, mulmod(zz1, z1, p), p) // s2 = y2*z1³
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- let h := addmod(u2, sub(p, u1), p) // h = u2-u1
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- let hh := mulmod(h, h, p) // h²
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- let hhh := mulmod(h, hh, p) // h³
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- let r := addmod(s2, sub(p, s1), p) // r = s2-s1
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-
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- // x' = r²-h³-2*u1*h²
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- rx := addmod(addmod(mulmod(r, r, p), sub(p, hhh), p), sub(p, mulmod(2, mulmod(u1, hh, p), p)), p)
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- // y' = r*(u1*h²-x')-s1*h³
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- ry := addmod(mulmod(r, addmod(mulmod(u1, hh, p), sub(p, rx), p), p), sub(p, mulmod(s1, hhh, p)), p)
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- // z' = h*z1*z2
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- rz := mulmod(h, mulmod(z1, z2, p), p)
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- }
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- }
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-}
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