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package sun.security.rsa;

import java.io.IOException;
import java.math.BigInteger;

import java.security.*;
import java.security.interfaces.*;

import sun.security.util.*;
import sun.security.pkcs.PKCS8Key;

Key implementation for RSA private keys, non-CRT form (modulus, private exponent only). For CRT private keys, see RSAPrivateCrtKeyImpl. We need separate classes to ensure correct behavior in instanceof checks, etc. Note: RSA keys must be at least 512 bits long
Author: Andreas Sterbenz
See Also:
Since: 1.5
/** * Key implementation for RSA private keys, non-CRT form (modulus, private * exponent only). For CRT private keys, see RSAPrivateCrtKeyImpl. We need * separate classes to ensure correct behavior in instanceof checks, etc. * * Note: RSA keys must be at least 512 bits long * * @see RSAPrivateCrtKeyImpl * @see RSAKeyFactory * * @since 1.5 * @author Andreas Sterbenz */
public final class RSAPrivateKeyImpl extends PKCS8Key implements RSAPrivateKey { private static final long serialVersionUID = -33106691987952810L; private final BigInteger n; // modulus private final BigInteger d; // private exponent
Construct a key from its components. Used by the RSAKeyFactory and the RSAKeyPairGenerator.
/** * Construct a key from its components. Used by the * RSAKeyFactory and the RSAKeyPairGenerator. */
RSAPrivateKeyImpl(BigInteger n, BigInteger d) throws InvalidKeyException { this.n = n; this.d = d; RSAKeyFactory.checkRSAProviderKeyLengths(n.bitLength(), null); // generate the encoding algid = RSAPrivateCrtKeyImpl.rsaId; try { DerOutputStream out = new DerOutputStream(); out.putInteger(0); // version must be 0 out.putInteger(n); out.putInteger(0); out.putInteger(d); out.putInteger(0); out.putInteger(0); out.putInteger(0); out.putInteger(0); out.putInteger(0); DerValue val = new DerValue(DerValue.tag_Sequence, out.toByteArray()); key = val.toByteArray(); } catch (IOException exc) { // should never occur throw new InvalidKeyException(exc); } } // see JCA doc public String getAlgorithm() { return "RSA"; } // see JCA doc public BigInteger getModulus() { return n; } // see JCA doc public BigInteger getPrivateExponent() { return d; } }