45 lines
1.5 KiB
Go
45 lines
1.5 KiB
Go
// Package secp256k1 is an implementation of the kyber.{Group,Point,Scalar}
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////////////////////////////////////////////////////////////////////////////////
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// XXX: Do not use in production until this code has been audited.
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////////////////////////////////////////////////////////////////////////////////
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// interfaces, based on btcd/btcec and kyber/group/mod
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//
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// XXX: NOT CONSTANT TIME!
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package secp256k1
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import (
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"math/big"
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secp256k1BTCD "github.com/btcsuite/btcd/btcec"
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"go.dedis.ch/kyber/v3"
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)
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// Secp256k1 represents the secp256k1 group.
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// There are no parameters and no initialization is required
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// because it supports only this one specific curve.
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type Secp256k1 struct{}
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// s256 is the btcec representation of secp256k1.
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var s256 *secp256k1BTCD.KoblitzCurve = secp256k1BTCD.S256()
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// String returns the name of the curve
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func (*Secp256k1) String() string { return "Secp256k1" }
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var egScalar kyber.Scalar = newScalar(big.NewInt(0))
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var egPoint kyber.Point = &secp256k1Point{newFieldZero(), newFieldZero()}
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// ScalarLen returns the length of a marshalled Scalar
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func (*Secp256k1) ScalarLen() int { return egScalar.MarshalSize() }
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// Scalar creates a new Scalar for the prime-order group on the secp256k1 curve
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func (*Secp256k1) Scalar() kyber.Scalar { return newScalar(big.NewInt(0)) }
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// PointLen returns the length of a marshalled Point
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func (*Secp256k1) PointLen() int { return egPoint.MarshalSize() }
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// Point returns a new secp256k1 point
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func (*Secp256k1) Point() kyber.Point {
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return &secp256k1Point{newFieldZero(), newFieldZero()}
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}
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