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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 to JDK 1.8 with debug enabled.

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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.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERSequence;


/**
 * an Iso7816RSAPublicKeyStructure structure.
 * 
 *  Certificate Holder Authorization ::= SEQUENCE {
 *      // modulus should be at least 1024bit and a multiple of 512.
 *      DERTaggedObject        modulus,
 *      // access rights    exponent
 *      DERTaggedObject    accessRights,
 *  }
 * 
*/ public class RSAPublicKey extends PublicKeyDataObject { private ASN1ObjectIdentifier usage; private BigInteger modulus; private BigInteger exponent; private int valid = 0; private static int modulusValid = 0x01; private static int exponentValid = 0x02; RSAPublicKey(ASN1Sequence seq) { Enumeration en = seq.getObjects(); this.usage = ASN1ObjectIdentifier.getInstance(en.nextElement()); while (en.hasMoreElements()) { UnsignedInteger val = UnsignedInteger.getInstance(en.nextElement()); switch (val.getTagNo()) { case 0x1: setModulus(val); break; case 0x2: setExponent(val); break; default: throw new IllegalArgumentException("Unknown DERTaggedObject :" + val.getTagNo() + "-> not an Iso7816RSAPublicKeyStructure"); } } if (valid != 0x3) { throw new IllegalArgumentException("missing argument -> not an Iso7816RSAPublicKeyStructure"); } } public RSAPublicKey(ASN1ObjectIdentifier usage, BigInteger modulus, BigInteger exponent) { this.usage = usage; this.modulus = modulus; this.exponent = exponent; } public ASN1ObjectIdentifier getUsage() { return usage; } public BigInteger getModulus() { return modulus; } public BigInteger getPublicExponent() { return exponent; } private void setModulus(UnsignedInteger modulus) { if ((valid & modulusValid) == 0) { valid |= modulusValid; this.modulus = modulus.getValue(); } else { throw new IllegalArgumentException("Modulus already set"); } } private void setExponent(UnsignedInteger exponent) { if ((valid & exponentValid) == 0) { valid |= exponentValid; this.exponent = exponent.getValue(); } else { throw new IllegalArgumentException("Exponent already set"); } } public ASN1Primitive toASN1Primitive() { ASN1EncodableVector v = new ASN1EncodableVector(); v.add(usage); v.add(new UnsignedInteger(0x01, getModulus())); v.add(new UnsignedInteger(0x02, getPublicExponent())); return new DERSequence(v); } }




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