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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 and up.
package org.bouncycastle.asn1.eac;
import java.math.BigInteger;
import java.util.Enumeration;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.util.Arrays;
/**
* an Iso7816ECDSAPublicKeyStructure structure.
*
* Certificate Holder Authorization ::= SEQUENCE {
* ASN1TaggedObject primeModulusP; // OPTIONAL
* ASN1TaggedObject firstCoefA; // OPTIONAL
* ASN1TaggedObject secondCoefB; // OPTIONAL
* ASN1TaggedObject basePointG; // OPTIONAL
* ASN1TaggedObject orderOfBasePointR; // OPTIONAL
* ASN1TaggedObject publicPointY; //REQUIRED
* ASN1TaggedObject cofactorF; // OPTIONAL
* }
*
*/
public class ECDSAPublicKey
extends PublicKeyDataObject
{
private ASN1ObjectIdentifier usage;
private BigInteger primeModulusP; // OPTIONAL
private BigInteger firstCoefA; // OPTIONAL
private BigInteger secondCoefB; // OPTIONAL
private byte[] basePointG; // OPTIONAL
private BigInteger orderOfBasePointR; // OPTIONAL
private byte[] publicPointY; //REQUIRED
private BigInteger cofactorF; // OPTIONAL
private int options;
private static final int P = 0x01;
private static final int A = 0x02;
private static final int B = 0x04;
private static final int G = 0x08;
private static final int R = 0x10;
private static final int Y = 0x20;
private static final int F = 0x40;
ECDSAPublicKey(ASN1Sequence seq)
throws IllegalArgumentException
{
Enumeration en = seq.getObjects();
this.usage = ASN1ObjectIdentifier.getInstance(en.nextElement());
options = 0;
while (en.hasMoreElements())
{
Object obj = en.nextElement();
if (obj instanceof ASN1TaggedObject)
{
ASN1TaggedObject to = (ASN1TaggedObject)obj;
switch (to.getTagNo())
{
case 0x1:
setPrimeModulusP(UnsignedInteger.getInstance(to).getValue());
break;
case 0x2:
setFirstCoefA(UnsignedInteger.getInstance(to).getValue());
break;
case 0x3:
setSecondCoefB(UnsignedInteger.getInstance(to).getValue());
break;
case 0x4:
setBasePointG(ASN1OctetString.getInstance(to, false));
break;
case 0x5:
setOrderOfBasePointR(UnsignedInteger.getInstance(to).getValue());
break;
case 0x6:
setPublicPointY(ASN1OctetString.getInstance(to, false));
break;
case 0x7:
setCofactorF(UnsignedInteger.getInstance(to).getValue());
break;
default:
options = 0;
throw new IllegalArgumentException("Unknown Object Identifier!");
}
}
else
{
throw new IllegalArgumentException("Unknown Object Identifier!");
}
}
if (options != 0x20 && options != 0x7F)
{
throw new IllegalArgumentException("All options must be either present or absent!");
}
}
public ECDSAPublicKey(ASN1ObjectIdentifier usage, byte[] ppY)
throws IllegalArgumentException
{
this.usage = usage;
setPublicPointY(new DEROctetString(ppY));
}
public ECDSAPublicKey(ASN1ObjectIdentifier usage, BigInteger p, BigInteger a, BigInteger b, byte[] basePoint, BigInteger order, byte[] publicPoint, int cofactor)
{
this.usage = usage;
setPrimeModulusP(p);
setFirstCoefA(a);
setSecondCoefB(b);
setBasePointG(new DEROctetString(basePoint));
setOrderOfBasePointR(order);
setPublicPointY(new DEROctetString(publicPoint));
setCofactorF(BigInteger.valueOf(cofactor));
}
public ASN1ObjectIdentifier getUsage()
{
return usage;
}
public byte[] getBasePointG()
{
if ((options & G) != 0)
{
return Arrays.clone(basePointG);
}
else
{
return null;
}
}
private void setBasePointG(ASN1OctetString basePointG)
throws IllegalArgumentException
{
if ((options & G) == 0)
{
options |= G;
this.basePointG = basePointG.getOctets();
}
else
{
throw new IllegalArgumentException("Base Point G already set");
}
}
public BigInteger getCofactorF()
{
if ((options & F) != 0)
{
return cofactorF;
}
else
{
return null;
}
}
private void setCofactorF(BigInteger cofactorF)
throws IllegalArgumentException
{
if ((options & F) == 0)
{
options |= F;
this.cofactorF = cofactorF;
}
else
{
throw new IllegalArgumentException("Cofactor F already set");
}
}
public BigInteger getFirstCoefA()
{
if ((options & A) != 0)
{
return firstCoefA;
}
else
{
return null;
}
}
private void setFirstCoefA(BigInteger firstCoefA)
throws IllegalArgumentException
{
if ((options & A) == 0)
{
options |= A;
this.firstCoefA = firstCoefA;
}
else
{
throw new IllegalArgumentException("First Coef A already set");
}
}
public BigInteger getOrderOfBasePointR()
{
if ((options & R) != 0)
{
return orderOfBasePointR;
}
else
{
return null;
}
}
private void setOrderOfBasePointR(BigInteger orderOfBasePointR)
throws IllegalArgumentException
{
if ((options & R) == 0)
{
options |= R;
this.orderOfBasePointR = orderOfBasePointR;
}
else
{
throw new IllegalArgumentException("Order of base point R already set");
}
}
public BigInteger getPrimeModulusP()
{
if ((options & P) != 0)
{
return primeModulusP;
}
else
{
return null;
}
}
private void setPrimeModulusP(BigInteger primeModulusP)
{
if ((options & P) == 0)
{
options |= P;
this.primeModulusP = primeModulusP;
}
else
{
throw new IllegalArgumentException("Prime Modulus P already set");
}
}
public byte[] getPublicPointY()
{
if ((options & Y) != 0)
{
return Arrays.clone(publicPointY);
}
else
{
return null;
}
}
private void setPublicPointY(ASN1OctetString publicPointY)
throws IllegalArgumentException
{
if ((options & Y) == 0)
{
options |= Y;
this.publicPointY = publicPointY.getOctets();
}
else
{
throw new IllegalArgumentException("Public Point Y already set");
}
}
public BigInteger getSecondCoefB()
{
if ((options & B) != 0)
{
return secondCoefB;
}
else
{
return null;
}
}
private void setSecondCoefB(BigInteger secondCoefB)
throws IllegalArgumentException
{
if ((options & B) == 0)
{
options |= B;
this.secondCoefB = secondCoefB;
}
else
{
throw new IllegalArgumentException("Second Coef B already set");
}
}
public boolean hasParameters()
{
return primeModulusP != null;
}
public ASN1EncodableVector getASN1EncodableVector(ASN1ObjectIdentifier oid, boolean publicPointOnly)
{
ASN1EncodableVector v = new ASN1EncodableVector(8);
v.add(oid);
if (!publicPointOnly)
{
v.add(new UnsignedInteger(0x01, getPrimeModulusP()));
v.add(new UnsignedInteger(0x02, getFirstCoefA()));
v.add(new UnsignedInteger(0x03, getSecondCoefB()));
v.add(new DERTaggedObject(false, 0x04, new DEROctetString(getBasePointG())));
v.add(new UnsignedInteger(0x05, getOrderOfBasePointR()));
}
v.add(new DERTaggedObject(false, 0x06, new DEROctetString(getPublicPointY())));
if (!publicPointOnly)
{
v.add(new UnsignedInteger(0x07, getCofactorF()));
}
return v;
}
public ASN1Primitive toASN1Primitive()
{
return new DERSequence(getASN1EncodableVector(usage, !hasParameters()));
}
}