libjava/classpath/java/security/spec/RSAMultiPrimePrivateCrtKeySpec.java

/* PSSParameterSpec.java --
   Copyright (C) 2003, Free Software Foundation, Inc.

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package java.security.spec;

import java.math.BigInteger;

/**
 * This class represents an RSA multi-prime private key, as defined in the
 * PKCS#1 v2.1, using the <i>Chinese Remainder Theorem</i> (CRT) information
 * values.
 *
 * @since 1.4
 * @see java.security.Key
 * @see java.security.KeyFactory
 * @see KeySpec
 * @see PKCS8EncodedKeySpec
 * @see RSAPrivateKeySpec
 * @see RSAPublicKeySpec
 * @see RSAOtherPrimeInfo
 */
public class RSAMultiPrimePrivateCrtKeySpec extends RSAPrivateKeySpec
{
  // Constants and fields
  // --------------------------------------------------------------------------

  private BigInteger publicExponent;
  private BigInteger primeP;
  private BigInteger primeQ;
  private BigInteger primeExponentP;
  private BigInteger primeExponentQ;
  private BigInteger crtCoefficient;
  private RSAOtherPrimeInfo[] otherPrimeInfo;

  // Constructor(s)
  // --------------------------------------------------------------------------

  /**
   * Constructs a new instance of <code>RSAMultiPrimePrivateCrtKeySpec</code>
   * given the various PKCS#1 v2.1 parameters.
   *
   * <p>Note that <code>otherPrimeInfo</code> is cloned when constructing this
   * object.</p>
   *
   * @param modulus
   *          the modulus n.
   * @param publicExponent
   *          the public exponent e.
   * @param privateExponent
   *          the private exponent d.
   * @param primeP
   *          the prime factor p of n.
   * @param primeQ
   *          the prime factor q of n.
   * @param primeExponentP
   *          this is d mod (p-1).
   * @param primeExponentQ
   *          this is d mod (q-1).
   * @param crtCoefficient
   *          the Chinese Remainder Theorem coefficient q-1 mod p.
   * @param otherPrimeInfo
   *          triplets of the rest of primes, <code>null</code> can be
   *          specified if there are only two prime factors (p and q).
   * @throws NullPointerException
   *           if any of the parameters is <code>null</code>.
   * @throws IllegalArgumentException
   *           if an empty <code>otherPrimeInfo</code> is specified.
   */
  public RSAMultiPrimePrivateCrtKeySpec(BigInteger modulus,
                                        BigInteger publicExponent,
                                        BigInteger privateExponent,
                                        BigInteger primeP,
                                        BigInteger primeQ,
                                        BigInteger primeExponentP,
                                        BigInteger primeExponentQ,
                                        BigInteger crtCoefficient,
                                        RSAOtherPrimeInfo[] otherPrimeInfo)
  {
    super(modulus, privateExponent);

    if (modulus == null)
      throw new NullPointerException("modulus");
    if (publicExponent == null)
      throw new NullPointerException("publicExponent");
    if (privateExponent == null)
      throw new NullPointerException("privateExponent");
    if (primeP == null)
      throw new NullPointerException("primeP");
    if (primeQ == null)
      throw new NullPointerException("primeQ");
    if (primeExponentP == null)
      throw new NullPointerException("primeExponentP");
    if (primeExponentQ == null)
      throw new NullPointerException("primeExponentQ");
    if (crtCoefficient == null)
      throw new NullPointerException("crtCoefficient");
    if (otherPrimeInfo != null)
      if (otherPrimeInfo.length == 0)
        throw new IllegalArgumentException();
      else
        this.otherPrimeInfo = (RSAOtherPrimeInfo[]) otherPrimeInfo.clone();

    this.publicExponent = publicExponent;
    this.primeP = primeP;
    this.primeQ = primeQ;
    this.primeExponentP = primeExponentP;
    this.primeExponentQ = primeExponentQ;
    this.crtCoefficient = crtCoefficient;
  }

  // Class methods
  // --------------------------------------------------------------------------

  // Instance methods
  // --------------------------------------------------------------------------

  /**
   * Returns the public exponent.
   *
   * @return the public exponent.
   */
  public BigInteger getPublicExponent()
  {
    return this.publicExponent;
  }

  /**
   * Returns the prime p.
   *
   * @return the prime p.
   */
  public BigInteger getPrimeP()
  {
    return this.primeP;
  }

  /**
   * Returns the prime q.
   *
   * @return the prime q.
   */
  public BigInteger getPrimeQ()
  {
    return this.primeQ;
  }

  /**
   * Returns d mod (p-1).
   *
   * @return d mod (p-1).
   */
  public BigInteger getPrimeExponentP()
  {
    return this.primeExponentP;
  }

  /**
   * Returns d mod (q-1).
   *
   * @return d mod (q-1).
   */
  public BigInteger getPrimeExponentQ()
  {
    return this.primeExponentQ;
  }

  /**
   * Returns the CRT Coefficient q-1 mod p.
   *
   * @return the CRT Coefficient q-1 mod p.
   */
  public BigInteger getCrtCoefficient()
  {
    return this.crtCoefficient;
  }

  /**
   * Returns a clone of <code>otherPrimeInfo</code> or <code>null</code> if
   * it was <code>null</code> at construction time.
   *
   * @return a cloned copy of <code>otherPrimeInfo</code>.
   */
  public RSAOtherPrimeInfo[] getOtherPrimeInfo()
  {
    return this.otherPrimeInfo == null
        ? null
        : (RSAOtherPrimeInfo[]) this.otherPrimeInfo.clone();
  }
}