1 files changed, 0 insertions, 165 deletions
diff --git a/src/crypto/elliptic/p521.go b/src/crypto/elliptic/p521.go
deleted file mode 100644
index 6a3ade3c36..0000000000
--- a/src/crypto/elliptic/p521.go
+++ /dev/null
@@ -1,165 +0,0 @@
-// Copyright 2013 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package elliptic
-
-import (
-	"crypto/elliptic/internal/nistec"
-	"crypto/rand"
-	"math/big"
-)
-
-// p521Curve is a Curve implementation based on nistec.P521Point.
-//
-// It's a wrapper that exposes the big.Int-based Curve interface and encodes the
-// legacy idiosyncrasies it requires, such as invalid and infinity point
-// handling.
-//
-// To interact with the nistec package, points are encoded into and decoded from
-// properly formatted byte slices. All big.Int use is limited to this package.
-// Encoding and decoding is 1/1000th of the runtime of a scalar multiplication,
-// so the overhead is acceptable.
-type p521Curve struct {
-	params *CurveParams
-}
-
-var p521 p521Curve
-var _ Curve = p521
-
-func initP521() {
-	p521.params = &CurveParams{
-		Name:    "P-521",
-		BitSize: 521,
-		// FIPS 186-4, section D.1.2.5
-		P: bigFromDecimal("68647976601306097149819007990813932172694353001433" +
-			"0540939446345918554318339765605212255964066145455497729631139148" +
-			"0858037121987999716643812574028291115057151"),
-		N: bigFromDecimal("68647976601306097149819007990813932172694353001433" +
-			"0540939446345918554318339765539424505774633321719753296399637136" +
-			"3321113864768612440380340372808892707005449"),
-		B: bigFromHex("0051953eb9618e1c9a1f929a21a0b68540eea2da725b99b315f3b8" +
-			"b489918ef109e156193951ec7e937b1652c0bd3bb1bf073573df883d2c34f1ef" +
-			"451fd46b503f00"),
-		Gx: bigFromHex("00c6858e06b70404e9cd9e3ecb662395b4429c648139053fb521f8" +
-			"28af606b4d3dbaa14b5e77efe75928fe1dc127a2ffa8de3348b3c1856a429bf9" +
-			"7e7e31c2e5bd66"),
-		Gy: bigFromHex("011839296a789a3bc0045c8a5fb42c7d1bd998f54449579b446817" +
-			"afbd17273e662c97ee72995ef42640c550b9013fad0761353c7086a272c24088" +
-			"be94769fd16650"),
-	}
-}
-
-func (curve p521Curve) Params() *CurveParams {
-	return curve.params
-}
-
-func (curve p521Curve) IsOnCurve(x, y *big.Int) bool {
-	// IsOnCurve is documented to reject (0, 0), the conventional point at
-	// infinity, which however is accepted by p521PointFromAffine.
-	if x.Sign() == 0 && y.Sign() == 0 {
-		return false
-	}
-	_, ok := p521PointFromAffine(x, y)
-	return ok
-}
-
-func p521PointFromAffine(x, y *big.Int) (p *nistec.P521Point, ok bool) {
-	// (0, 0) is by convention the point at infinity, which can't be represented
-	// in affine coordinates. Marshal incorrectly encodes it as an uncompressed
-	// point, which SetBytes would correctly reject. See Issue 37294.
-	if x.Sign() == 0 && y.Sign() == 0 {
-		return nistec.NewP521Point(), true
-	}
-	if x.Sign() < 0 || y.Sign() < 0 {
-		return nil, false
-	}
-	if x.BitLen() > 521 || y.BitLen() > 521 {
-		return nil, false
-	}
-	p, err := nistec.NewP521Point().SetBytes(Marshal(P521(), x, y))
-	if err != nil {
-		return nil, false
-	}
-	return p, true
-}
-
-func p521PointToAffine(p *nistec.P521Point) (x, y *big.Int) {
-	out := p.Bytes()
-	if len(out) == 1 && out[0] == 0 {
-		// This is the correct encoding of the point at infinity, which
-		// Unmarshal does not support. See Issue 37294.
-		return new(big.Int), new(big.Int)
-	}
-	x, y = Unmarshal(P521(), out)
-	if x == nil {
-		panic("crypto/elliptic: internal error: Unmarshal rejected a valid point encoding")
-	}
-	return x, y
-}
-
-// p521RandomPoint returns a random point on the curve. It's used when Add,
-// Double, or ScalarMult are fed a point not on the curve, which is undefined
-// behavior. Originally, we used to do the math on it anyway (which allows
-// invalid curve attacks) and relied on the caller and Unmarshal to avoid this
-// happening in the first place. Now, we just can't construct a nistec.P521Point
-// for an invalid pair of coordinates, because that API is safer. If we panic,
-// we risk introducing a DoS. If we return nil, we risk a panic. If we return
-// the input, ecdsa.Verify might fail open. The safest course seems to be to
-// return a valid, random point, which hopefully won't help the attacker.
-func p521RandomPoint() (x, y *big.Int) {
-	_, x, y, err := GenerateKey(P521(), rand.Reader)
-	if err != nil {
-		panic("crypto/elliptic: failed to generate random point")
-	}
-	return x, y
-}
-
-func (p521Curve) Add(x1, y1, x2, y2 *big.Int) (*big.Int, *big.Int) {
-	p1, ok := p521PointFromAffine(x1, y1)
-	if !ok {
-		return p521RandomPoint()
-	}
-	p2, ok := p521PointFromAffine(x2, y2)
-	if !ok {
-		return p521RandomPoint()
-	}
-	return p521PointToAffine(p1.Add(p1, p2))
-}
-
-func (p521Curve) Double(x1, y1 *big.Int) (*big.Int, *big.Int) {
-	p, ok := p521PointFromAffine(x1, y1)
-	if !ok {
-		return p521RandomPoint()
-	}
-	return p521PointToAffine(p.Double(p))
-}
-
-func (p521Curve) ScalarMult(Bx, By *big.Int, scalar []byte) (*big.Int, *big.Int) {
-	p, ok := p521PointFromAffine(Bx, By)
-	if !ok {
-		return p521RandomPoint()
-	}
-	return p521PointToAffine(p.ScalarMult(p, scalar))
-}
-
-func (p521Curve) ScalarBaseMult(scalar []byte) (*big.Int, *big.Int) {
-	p := nistec.NewP521Generator()
-	return p521PointToAffine(p.ScalarMult(p, scalar))
-}
-
-func bigFromDecimal(s string) *big.Int {
-	b, ok := new(big.Int).SetString(s, 10)
-	if !ok {
-		panic("invalid encoding")
-	}
-	return b
-}
-
-func bigFromHex(s string) *big.Int {
-	b, ok := new(big.Int).SetString(s, 16)
-	if !ok {
-		panic("invalid encoding")
-	}
-	return b
-}