1 files changed, 12 insertions, 0 deletions

diff --git a/internal/secp256k1/point.go b/internal/secp256k1/point.go
index 1def176..5215590 100644
--- a/internal/secp256k1/point.go
+++ b/internal/secp256k1/point.go
@@ -162,6 +162,18 @@ func (p *Point) Negate() *Point {
         return &Point{x: p.x.Clone(), y: negY, infinity: false}
 }
 
+// XBytes returns the x-coordinate as a 32-byte big-endian slice.
+// Returns nil for the point at infinity.
+func (p *Point) XBytes() []byte {
+        if p.infinity {
+                return nil
+        }
+        b := p.x.value.Bytes()
+        out := make([]byte, 32)
+        copy(out[32-len(b):], b)
+        return out
+}
+
 // String returns a readable representation
 func (p *Point) String() string {
         if p.infinity {