BETA STAGE: primary tests working

master
Harald Wolff 2017-10-23 12:12:36 +02:00
parent 91f770c6b1
commit 3ed4b493b2
4 changed files with 329 additions and 85 deletions

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@ -32,8 +32,9 @@
</ItemGroup>
<ItemGroup>
<Compile Include="Properties\AssemblyInfo.cs" />
<Compile Include="EC\EllipticCurve.cs" />
<Compile Include="EC\CurvePoint.cs" />
<Compile Include="EC\EllipticCurve.cs" />
<Compile Include="EC\ProjectiveCurvePoint.cs" />
</ItemGroup>
<ItemGroup>
<Folder Include="EC\" />
@ -47,6 +48,10 @@
<Project>{97CA3CA9-98B3-4492-B072-D7A5995B68E9}</Project>
<Name>sharp.extensions</Name>
</ProjectReference>
<ProjectReference Include="..\sharp-contracts\sharp.contracts.csproj">
<Project>{56733EC1-7D97-48D0-AA4C-98EA624A5A21}</Project>
<Name>sharp.contracts</Name>
</ProjectReference>
</ItemGroup>
<Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
</Project>

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@ -1,4 +1,4 @@
using System;
using System;
using BigInt;
using System.Text;
using System.Runtime.CompilerServices;
@ -7,56 +7,115 @@ namespace Crypto.EC
{
public class CurvePoint
{
public CurvePoint(EllipticCurve curve,UInteger x,UInteger y){
public static readonly CurvePoint INFINITY = new CurvePoint();
public CurvePoint(EllipticCurve curve,Integer x,Integer y){
Curve = curve;
X = x;
Y = y;
}
public string toHexString(){
private CurvePoint(){
this.Curve = null;
this.X = 0;
this.Y = 0;
}
public string toHexString()
{
StringBuilder sb = new StringBuilder();
sb.Append(X.toHexString());
sb.Append(((UInteger)X).toHexString());
sb.Append(".");
sb.Append(Y.toHexString());
sb.Append(((UInteger)Y).toHexString());
return sb.ToString();
}
public override string ToString()
{
if ((object)this == (object)INFINITY){
return String.Format("[CurvePoint INFINITY]");
}
return String.Format("[CurvePoint X={0} Y={1}]",X.ToString(),Y.ToString());
}
public EllipticCurve Curve { get; private set; }
public UInteger X { get; private set; }
public UInteger Y { get; private set; }
public Integer X { get; private set; }
public Integer Y { get; private set; }
public bool isOnCurve(){
return this.Curve.isOnCurve(this);
}
public bool isInfinity(){
return ((object)this == (object)INFINITY);
}
public CurvePoint Negated(){
return new CurvePoint(Curve, X, Curve.Fp.AdditiveInverse(Y));
}
public static CurvePoint operator +(CurvePoint p1, CurvePoint p2)
{
return p1.Curve.Add(p1,p2);
if ((object)p1 == (object)INFINITY){
return p2;
}
if ((object)p2 == (object)INFINITY){
return p1;
}
return p1.Curve.Add(p1, p2);
}
public static CurvePoint operator *(CurvePoint p1, UInteger n)
public static CurvePoint operator -(CurvePoint p1, CurvePoint p2)
{
if (p1.Y == UInteger.ZERO){
throw new NotImplementedException("Eternity point not implemented");
if ((object)p1 == (object)INFINITY){
return p2;
}
if ((object)p2 == (object)INFINITY){
return p1;
}
return p1.Curve.Add(p1, p2.Negated());
}
public static CurvePoint operator *(CurvePoint p1, Integer n)
{
if ((object)p1 == (object)INFINITY){
return INFINITY;
}
if (p1.Y == Integer.ZERO){
return INFINITY;
}
if (n.isZero()){
throw new NotImplementedException("CurevPoint * 0");
}
CurvePoint result = null;
CurvePoint p = p1;
int i;
int bitwidth = n.Log2();
for (i = 0; i < 256; i++)
if (bitwidth < 0){
bitwidth = -bitwidth;
}
for (i = 0; i < bitwidth; i++)
{
if (n[i]){
result = p;
if (n[i])
break;
}
p += p;
}
for (; i < 256; i++)
result = p;
for (i++; i <= bitwidth; i++)
{
p += p;
if (n[i]){
result += p;
result = p + result;
}
}

View File

@ -7,15 +7,15 @@ namespace Crypto.EC
{
public class EllipticCurve
{
public UInteger a { get; private set; }
public UInteger b { get; private set; }
public UInteger n { get; private set; }
public Integer a { get; private set; }
public Integer b { get; private set; }
public Integer n { get; private set; }
public int h { get; private set; }
public CurvePoint G { get; private set; }
public IntField Fp { get; private set; }
public EllipticCurve(UInteger p,UInteger a,UInteger b,UInteger xG,UInteger yG,UInteger n,int h)
public EllipticCurve(Integer p,Integer a,Integer b,Integer xG,Integer yG,Integer n,int h)
{
this.Fp = new IntField(p);
this.a = a;
@ -29,38 +29,38 @@ namespace Crypto.EC
}
}
public UInteger Y2(UInteger x){
public Integer Y2(Integer x){
UInteger yy = x;
Integer yy = x;
Console.WriteLine("Y(x): X = {0}",x.toHexString());
Console.WriteLine("Y(x): x^2 = {0}",yy.Pow(2).toHexString());
//Console.WriteLine("Y(x): X = {0}",x.toHexString());
//Console.WriteLine("Y(x): x^2 = {0}",yy.Pow(2).toHexString());
yy = yy.Pow(3);
Console.WriteLine("Y(x): x^3 = {0}",yy.toHexString());
//Console.WriteLine("Y(x): x^3 = {0}",yy.toHexString());
yy += (a * x);
Console.WriteLine("Y(x): x^3 + ax = {0}",yy.toHexString());
//Console.WriteLine("Y(x): x^3 + ax = {0}",yy.toHexString());
yy += b;
Console.WriteLine("Y(x) x^3 + ax + b = {0}",yy.toHexString());
//Console.WriteLine("Y(x) x^3 + ax + b = {0}",yy.toHexString());
yy %= this.Fp.FieldModulo;
yy %= (Integer)this.Fp.FieldModulo;
Console.WriteLine("Y(x) mod p = {0}",yy.toHexString());
//Console.WriteLine("Y(x) mod p = {0}",yy.toHexString());
return yy;
}
public bool isOnCurve(CurvePoint p){
UInteger py2 = this.Fp.Fit(p.Y.Pow(2));
UInteger pcy2 = Y2(p.X);
Integer py2 = this.Fp.Fit(p.Y.Pow(2));
Integer pcy2 = Y2(p.X);
Console.WriteLine("CHECK A: {0}",py2.toHexString());
Console.WriteLine("CHECK B: {0}",pcy2.toHexString());
//Console.WriteLine("CHECK A: {0}",py2.toHexString());
//Console.WriteLine("CHECK B: {0}",pcy2.toHexString());
return (py2 == pcy2);
}
@ -69,57 +69,39 @@ namespace Crypto.EC
{
if (((object)p1 == null) || ((object)p2 == null))
{
throw new ArgumentException("CurvePoints to be added must not be null");
throw new ArgumentException("SignedCurvePoints to be added must not be null");
}
if (p1.Curve != p2.Curve)
{
throw new ArgumentException("Curvepoints to be added must belong to the same curve!");
throw new ArgumentException("SignedCurvePoints to be added must belong to the same curve!");
}
if (p1 == p2)
{
// UInteger inv2y = Euclid.inverse(this.Fp.Fit(p1.Y << 1),this.Fp.FieldModulo);
UInteger inv2y = Euclid.inverse((p1.Y * 2),this.Fp.FieldModulo);
UInteger s = Fp.Fit(p1.X.Pow(3)) * 3;
s += p1.Curve.a;
s *= inv2y;
//(((p1.X.Pow(2) * 3) + p1.Curve.a) / (p1.Y << 1));
UInteger xR = (s.Pow(2) - (p1.X * 2));
UInteger yR = ((s * (p1.X - xR)) - p1.Y);
xR = this.Fp.Fit(xR);
yR = this.Fp.Fit(yR);
return new CurvePoint(p1.Curve, xR, yR);
if ((p1 != p2) && (p1.X == p2.X)){
return CurvePoint.INFINITY;
}
if (p1.X == p2.X)
{
throw new NotImplementedException("Eternity point not implemented");
}
else
{
UInteger s = (((p1.Y - p2.Y) / (p1.X - p2.X)));
UInteger xR = (s.Pow(2) - p1.X - p2.X);
UInteger yR = ((s * (p1.X - xR)) - p1.Y);
Integer lambda,divlambda;
xR = this.Fp.Fit(xR);
yR = this.Fp.Fit(yR);
return new CurvePoint(p1.Curve, xR, yR);
if (p1 == p2){
lambda = Fp.Fit(3 * p1.X.Pow(2) + a);
divlambda = Fp.Fit(2 * p1.Y);
} else {
lambda = Fp.Fit(p2.Y - p1.Y);
divlambda = Fp.Fit(p2.X - p1.X);
}
throw new NotImplementedException("Point addition not yet implemented");
lambda = lambda * Euclid.inverse(divlambda, Fp.FieldModulo);
Integer xR = (lambda.Pow(2) - p1.X - p2.X);
Integer yR = (lambda * (p1.X - xR)) - p1.Y;
xR = Fp.Fit(xR);
yR = Fp.Fit(yR);
return new CurvePoint(this, xR, yR);
}
/* public CurvePoint getPoint(T x){
x = new T(x, this.Fp);
return new CurvePoint(this,x,Y(x));
}
*/
public override string ToString()
{
StringBuilder sb = new StringBuilder();
@ -134,20 +116,20 @@ namespace Crypto.EC
}
public static EllipticCurve createSecp256k1(){
UInteger p = (UInteger.ONE << 256);
p -= UInteger.ONE;
p -= (UInteger.ONE << 32);
p -= (UInteger.ONE << 9);
p -= (UInteger.ONE << 8);
p -= (UInteger.ONE << 7);
p -= (UInteger.ONE << 6);
p -= (UInteger.ONE << 4);
Integer p = (Integer.ONE << 256);
p -= Integer.ONE;
p -= (Integer.ONE << 32);
p -= (Integer.ONE << 9);
p -= (Integer.ONE << 8);
p -= (Integer.ONE << 7);
p -= (Integer.ONE << 6);
p -= (Integer.ONE << 4);
UInteger xG = UInteger.fromHexString("79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798");
UInteger yG = UInteger.fromHexString("483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8");
Integer xG = Integer.fromHexString("79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798");
Integer yG = Integer.fromHexString("483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8");
UInteger n = UInteger.fromHexString("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141");
return new EllipticCurve(p, new UInteger(0), new UInteger(7), xG, yG, n, 1);
Integer n = Integer.fromHexString("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141");
return new EllipticCurve(p, new Integer(0), new Integer(7), xG, yG, n, 1);
}
}
}

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@ -0,0 +1,198 @@
using System;
using BigInt;
using System.CodeDom;
using sharp.contracts;
namespace Crypto.EC
{
public class ProjectiveCurvePoint
{
public static readonly ProjectiveCurvePoint INFINITY = new ProjectiveCurvePoint(null,1,0,0);
public Integer X { get; set; }
public Integer Y { get; set; }
public Integer Z { get; set; }
public EllipticCurve Curve { get; private set; }
public ProjectiveCurvePoint(CurvePoint p)
{
this.Curve = p.Curve;
this.X = p.X;
this.Y = p.Y;
this.Z = 1;
}
public ProjectiveCurvePoint(EllipticCurve curve,Integer x,Integer y,Integer z)
{
this.Curve = curve;
this.X = x;
this.Y = y;
this.Z = z;
}
public CurvePoint toCurvePoint(){
if (Z.isZero()){
return CurvePoint.INFINITY;
}
Integer iz = Euclid.inverse(Z, Curve.Fp.FieldModulo);
Integer nx = Curve.Fp.Fit(X * iz);
Integer ny = Curve.Fp.Fit(Y * iz);
return new CurvePoint(Curve, nx, ny);
}
public override bool Equals(object obj)
{
ProjectiveCurvePoint p = INFINITY;
return new BooleanConditional()
.requires(obj != null)
.requires(GetType().IsInstanceOfType(obj))
.does( () => { p = (ProjectiveCurvePoint)obj; } )
.requires(this.Curve == p.Curve)
.requires(this.X == p.X)
.requires(this.Y == p.Y)
.requires(this.Z == p.Z)
.isSuccess();
}
public ProjectiveCurvePoint doubled()
{
Integer s = Curve.Fp.Fit(Y * Z);
Integer B = Curve.Fp.Fit(X * Y * s);
Integer w = Curve.Fp.Fit(
(Curve.a * Z.Pow(2)) +
(X.Pow(2) * 3)
);
Integer h = Curve.Fp.Fit(w.Pow(2) - (B * 8));
Integer xd = h * s * 2;
Integer yd = (
(w * ((B * 4) - h)) -
(Y.Pow(2) * s.Pow(2) * 8)
);
Integer zd = s.Pow(3) * 8;
xd = Curve.Fp.Fit(xd);
yd = Curve.Fp.Fit(yd);
zd = Curve.Fp.Fit(zd);
return new ProjectiveCurvePoint(Curve,xd,yd,zd);
}
public ProjectiveCurvePoint add(ProjectiveCurvePoint p){
Integer u = Curve.Fp.Fit( (p.Y * Z) - (Y * p.Z) );
Integer v = Curve.Fp.Fit( (p.X * Z) - (X * p.Z) );
Integer A = Curve.Fp.Fit(
(Z * p.Z * u.Pow(2)) - v.Pow(3) - (v.Pow(2) * X * p.Z * 2)
);
Integer xd = v * A;
Integer yd = (
(u * ((X * p.Z * v.Pow(2)) - A)) -
(v.Pow(3) * Y * p.Z)
);
Integer zd = Z * p.Z * v.Pow(3);
xd = Curve.Fp.Fit(xd);
yd = Curve.Fp.Fit(yd);
zd = Curve.Fp.Fit(zd);
if (zd == 0){
return INFINITY;
}
return new ProjectiveCurvePoint(Curve, xd, yd, zd);
}
public ProjectiveCurvePoint Negated(){
return new ProjectiveCurvePoint(Curve, X, Curve.Fp.AdditiveInverse(Y), Z);
}
public override string ToString()
{
return string.Format("[ProjectiveCurvePoint: Curve=... X={1} Y={2} Z={3}]", Curve,X,Y,Z);
}
public static implicit operator ProjectiveCurvePoint(CurvePoint p){
return new ProjectiveCurvePoint(p);
}
public static ProjectiveCurvePoint operator +(ProjectiveCurvePoint p1, ProjectiveCurvePoint p2)
{
if ((object)p1 == INFINITY){
return p2;
} else if ((object)p2 == INFINITY){
return p1;
} else if (p1.Equals(p2)){
return p1.doubled();
} else {
return p1.add(p2);
}
}
public static ProjectiveCurvePoint operator -(ProjectiveCurvePoint p1, ProjectiveCurvePoint p2)
{
if ((object)p1 == INFINITY)
{
return p2;
}
else if ((object)p2 == INFINITY)
{
return p1;
}
return p1 + p2.Negated();
}
public static ProjectiveCurvePoint operator *(ProjectiveCurvePoint p1, Integer n)
{
if ((object)p1 == (object)INFINITY)
{
return INFINITY;
}
if (p1.Y == Integer.ZERO)
{
return INFINITY;
}
if (n.isZero())
{
throw new NotImplementedException("CurevPoint * 0");
}
ProjectiveCurvePoint result = null;
ProjectiveCurvePoint p = p1;
int i;
int bitwidth = n.Log2();
if (bitwidth < 0)
{
bitwidth = -bitwidth;
}
for (i = 0; i < bitwidth; i++)
{
if (n[i])
break;
p += p;
}
result = p;
for (i++; i <= bitwidth; i++)
{
p += p;
if (n[i])
{
result = p + result;
}
}
return result;
}
}
}