Java tutorial
package org.bouncycastle.jcajce.provider.asymmetric.rsa; import java.io.IOException; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import java.math.BigInteger; import java.security.interfaces.RSAPrivateCrtKey; import java.security.spec.RSAPrivateCrtKeySpec; import org.bouncycastle.asn1.DERNull; import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers; import org.bouncycastle.asn1.pkcs.PrivateKeyInfo; import org.bouncycastle.asn1.pkcs.RSAPrivateKey; import org.bouncycastle.asn1.x509.AlgorithmIdentifier; import org.bouncycastle.crypto.params.RSAPrivateCrtKeyParameters; import org.bouncycastle.jcajce.provider.asymmetric.util.KeyUtil; import org.bouncycastle.jcajce.provider.asymmetric.util.PKCS12BagAttributeCarrierImpl; import org.bouncycastle.util.Strings; /** * A provider representation for a RSA private key, with CRT factors included. */ public class BCRSAPrivateCrtKey extends BCRSAPrivateKey implements RSAPrivateCrtKey { static final long serialVersionUID = 7834723820638524718L; private BigInteger publicExponent; private BigInteger primeP; private BigInteger primeQ; private BigInteger primeExponentP; private BigInteger primeExponentQ; private BigInteger crtCoefficient; /** * construct a private key from it's org.bouncycastle.crypto equivalent. * * @param key the parameters object representing the private key. */ BCRSAPrivateCrtKey(RSAPrivateCrtKeyParameters key) { super(key); this.publicExponent = key.getPublicExponent(); this.primeP = key.getP(); this.primeQ = key.getQ(); this.primeExponentP = key.getDP(); this.primeExponentQ = key.getDQ(); this.crtCoefficient = key.getQInv(); } /** * construct a private key from an RSAPrivateCrtKeySpec * * @param spec the spec to be used in construction. */ BCRSAPrivateCrtKey(RSAPrivateCrtKeySpec spec) { super(new RSAPrivateCrtKeyParameters(spec.getModulus(), spec.getPublicExponent(), spec.getPrivateExponent(), spec.getPrimeP(), spec.getPrimeQ(), spec.getPrimeExponentP(), spec.getPrimeExponentQ(), spec.getCrtCoefficient())); this.modulus = spec.getModulus(); this.publicExponent = spec.getPublicExponent(); this.privateExponent = spec.getPrivateExponent(); this.primeP = spec.getPrimeP(); this.primeQ = spec.getPrimeQ(); this.primeExponentP = spec.getPrimeExponentP(); this.primeExponentQ = spec.getPrimeExponentQ(); this.crtCoefficient = spec.getCrtCoefficient(); } /** * construct a private key from another RSAPrivateCrtKey. * * @param key the object implementing the RSAPrivateCrtKey interface. */ BCRSAPrivateCrtKey(RSAPrivateCrtKey key) { super(new RSAPrivateCrtKeyParameters(key.getModulus(), key.getPublicExponent(), key.getPrivateExponent(), key.getPrimeP(), key.getPrimeQ(), key.getPrimeExponentP(), key.getPrimeExponentQ(), key.getCrtCoefficient())); this.modulus = key.getModulus(); this.publicExponent = key.getPublicExponent(); this.privateExponent = key.getPrivateExponent(); this.primeP = key.getPrimeP(); this.primeQ = key.getPrimeQ(); this.primeExponentP = key.getPrimeExponentP(); this.primeExponentQ = key.getPrimeExponentQ(); this.crtCoefficient = key.getCrtCoefficient(); } /** * construct an RSA key from a private key info object. */ BCRSAPrivateCrtKey(PrivateKeyInfo info) throws IOException { this(RSAPrivateKey.getInstance(info.parsePrivateKey())); } /** * construct an RSA key from a ASN.1 RSA private key object. */ BCRSAPrivateCrtKey(RSAPrivateKey key) { super(new RSAPrivateCrtKeyParameters(key.getModulus(), key.getPublicExponent(), key.getPrivateExponent(), key.getPrime1(), key.getPrime2(), key.getExponent1(), key.getExponent2(), key.getCoefficient())); this.modulus = key.getModulus(); this.publicExponent = key.getPublicExponent(); this.privateExponent = key.getPrivateExponent(); this.primeP = key.getPrime1(); this.primeQ = key.getPrime2(); this.primeExponentP = key.getExponent1(); this.primeExponentQ = key.getExponent2(); this.crtCoefficient = key.getCoefficient(); } /** * return the encoding format we produce in getEncoded(). * * @return the encoding format we produce in getEncoded(). */ public String getFormat() { return "PKCS#8"; } /** * Return a PKCS8 representation of the key. The sequence returned * represents a full PrivateKeyInfo object. * * @return a PKCS8 representation of the key. */ public byte[] getEncoded() { return KeyUtil.getEncodedPrivateKeyInfo( new AlgorithmIdentifier(PKCSObjectIdentifiers.rsaEncryption, DERNull.INSTANCE), new RSAPrivateKey(getModulus(), getPublicExponent(), getPrivateExponent(), getPrimeP(), getPrimeQ(), getPrimeExponentP(), getPrimeExponentQ(), getCrtCoefficient())); } /** * return the public exponent. * * @return the public exponent. */ public BigInteger getPublicExponent() { return publicExponent; } /** * return the prime P. * * @return the prime P. */ public BigInteger getPrimeP() { return primeP; } /** * return the prime Q. * * @return the prime Q. */ public BigInteger getPrimeQ() { return primeQ; } /** * return the prime exponent for P. * * @return the prime exponent for P. */ public BigInteger getPrimeExponentP() { return primeExponentP; } /** * return the prime exponent for Q. * * @return the prime exponent for Q. */ public BigInteger getPrimeExponentQ() { return primeExponentQ; } /** * return the CRT coefficient. * * @return the CRT coefficient. */ public BigInteger getCrtCoefficient() { return crtCoefficient; } public int hashCode() { return this.getModulus().hashCode() ^ this.getPublicExponent().hashCode() ^ this.getPrivateExponent().hashCode(); } public boolean equals(Object o) { if (o == this) { return true; } if (!(o instanceof RSAPrivateCrtKey)) { return false; } RSAPrivateCrtKey key = (RSAPrivateCrtKey) o; return this.getModulus().equals(key.getModulus()) && this.getPublicExponent().equals(key.getPublicExponent()) && this.getPrivateExponent().equals(key.getPrivateExponent()) && this.getPrimeP().equals(key.getPrimeP()) && this.getPrimeQ().equals(key.getPrimeQ()) && this.getPrimeExponentP().equals(key.getPrimeExponentP()) && this.getPrimeExponentQ().equals(key.getPrimeExponentQ()) && this.getCrtCoefficient().equals(key.getCrtCoefficient()); } private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException { in.defaultReadObject(); this.attrCarrier = new PKCS12BagAttributeCarrierImpl(); this.rsaPrivateKey = new RSAPrivateCrtKeyParameters(this.getModulus(), this.getPublicExponent(), this.getPrivateExponent(), this.getPrimeP(), this.getPrimeQ(), this.getPrimeExponentP(), this.getPrimeExponentQ(), this.getCrtCoefficient()); } private void writeObject(ObjectOutputStream out) throws IOException { out.defaultWriteObject(); } public String toString() { StringBuffer buf = new StringBuffer(); String nl = Strings.lineSeparator(); buf.append("RSA Private CRT Key [").append(RSAUtil.generateKeyFingerprint(this.getModulus())).append("]") .append(",[").append(RSAUtil.generateExponentFingerprint(this.getPublicExponent())).append("]") .append(nl); buf.append(" modulus: ").append(this.getModulus().toString(16)).append(nl); buf.append(" public exponent: ").append(this.getPublicExponent().toString(16)).append(nl); return buf.toString(); } }