commitment: first steps for SEAL

1 files changed, 50 insertions, 0 deletions

diff --git a/commitment/commitment.go b/commitment/commitment.go
new file mode 100644
index 0000000..31de03a
--- /dev/null
+++ b/commitment/commitment.go
@@ -0,0 +1,50 @@
+// Implements the data structures and methods for
+// creating a commitment for the SEAL protocol
+package commitment
+
+import (
+	"kesim.org/seal/curve"
+)
+
+type Scalar = curve.Curve25519Scalar
+type Point = curve.Curve25519Point
+
+var Curve = curve.Curve25519
+
+type Bidder struct {
+	private struct {
+		id *Scalar
+	}
+	Id *Point
+}
+
+type Bid struct {
+	Bidder *Point
+	zbid   uint64 // bigendian encoding of the bid
+	bits   []Bit  // derived from zbid
+}
+
+type Bit struct {
+	id *Scalar
+	v  bool
+	x  *Scalar
+	r  *Scalar
+	e  *BitCommitment
+}
+
+type BitCommitment struct {
+	Id  *Point
+	XRV *Point
+	X   *Point
+	R   *Point
+
+	Proofs struct {
+		X *Proof
+		R *Proof
+	}
+}
+
+type Proof struct {
+	PV *Point  `json:"V"`
+	Sr *Scalar `json:"r"`
+}