From b21fa8e2cd98d487d50755416c7ab90ebd6e620e Mon Sep 17 00:00:00 2001
From: HydroH <ixlesis@gmail.com>
Date: Tue, 6 May 2025 02:50:25 +0800
Subject: [PATCH] std: fix compile errors in `std.crypto.ecc` (#23797)

Implemented `neg()` method for `AffineCoordinates` struct of p256,
p384 and secp256k1 curves.

Resolves: #20505 (partially)
---
 lib/std/crypto/pcurves/p256.zig      | 4 ++++
 lib/std/crypto/pcurves/p384.zig      | 4 ++++
 lib/std/crypto/pcurves/secp256k1.zig | 4 ++++
 3 files changed, 12 insertions(+)

diff --git a/lib/std/crypto/pcurves/p256.zig b/lib/std/crypto/pcurves/p256.zig
index ec176f78c5..aa9226ae0d 100644
--- a/lib/std/crypto/pcurves/p256.zig
+++ b/lib/std/crypto/pcurves/p256.zig
@@ -471,6 +471,10 @@ pub const AffineCoordinates = struct {
     /// Identity element in affine coordinates.
     pub const identityElement = AffineCoordinates{ .x = P256.identityElement.x, .y = P256.identityElement.y };
 
+    pub fn neg(p: AffineCoordinates) AffineCoordinates {
+        return .{ .x = p.x, .y = p.y.neg() };
+    }
+
     fn cMov(p: *AffineCoordinates, a: AffineCoordinates, c: u1) void {
         p.x.cMov(a.x, c);
         p.y.cMov(a.y, c);
diff --git a/lib/std/crypto/pcurves/p384.zig b/lib/std/crypto/pcurves/p384.zig
index 3ab95da5e8..61632f61ed 100644
--- a/lib/std/crypto/pcurves/p384.zig
+++ b/lib/std/crypto/pcurves/p384.zig
@@ -471,6 +471,10 @@ pub const AffineCoordinates = struct {
     /// Identity element in affine coordinates.
     pub const identityElement = AffineCoordinates{ .x = P384.identityElement.x, .y = P384.identityElement.y };
 
+    pub fn neg(p: AffineCoordinates) AffineCoordinates {
+        return .{ .x = p.x, .y = p.y.neg() };
+    }
+
     fn cMov(p: *AffineCoordinates, a: AffineCoordinates, c: u1) void {
         p.x.cMov(a.x, c);
         p.y.cMov(a.y, c);
diff --git a/lib/std/crypto/pcurves/secp256k1.zig b/lib/std/crypto/pcurves/secp256k1.zig
index 945abea931..c891f414f5 100644
--- a/lib/std/crypto/pcurves/secp256k1.zig
+++ b/lib/std/crypto/pcurves/secp256k1.zig
@@ -549,6 +549,10 @@ pub const AffineCoordinates = struct {
     /// Identity element in affine coordinates.
     pub const identityElement = AffineCoordinates{ .x = Secp256k1.identityElement.x, .y = Secp256k1.identityElement.y };
 
+    pub fn neg(p: AffineCoordinates) AffineCoordinates {
+        return .{ .x = p.x, .y = p.y.neg() };
+    }
+
     fn cMov(p: *AffineCoordinates, a: AffineCoordinates, c: u1) void {
         p.x.cMov(a.x, c);
         p.y.cMov(a.y, c);