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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.x509.AlgorithmId;
import sun.security.pkcs.PKCS8Key;

Key implementation for RSA private keys, CRT form. For non-CRT private keys, see RSAPrivateKeyImpl. 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, CRT form. For non-CRT private * keys, see RSAPrivateKeyImpl. We need separate classes to ensure * correct behavior in instanceof checks, etc. * * Note: RSA keys must be at least 512 bits long * * @see RSAPrivateKeyImpl * @see RSAKeyFactory * * @since 1.5 * @author Andreas Sterbenz */
public final class RSAPrivateCrtKeyImpl extends PKCS8Key implements RSAPrivateCrtKey { private static final long serialVersionUID = -1326088454257084918L; private BigInteger n; // modulus private BigInteger e; // public exponent private BigInteger d; // private exponent private BigInteger p; // prime p private BigInteger q; // prime q private BigInteger pe; // prime exponent p private BigInteger qe; // prime exponent q private BigInteger coeff; // CRT coeffcient // algorithmId used to identify RSA keys static final AlgorithmId rsaId = new AlgorithmId(AlgorithmId.RSAEncryption_oid);
Generate a new key from its encoding. Returns a CRT key if possible and a non-CRT key otherwise. Used by RSAKeyFactory.
/** * Generate a new key from its encoding. Returns a CRT key if possible * and a non-CRT key otherwise. Used by RSAKeyFactory. */
public static RSAPrivateKey newKey(byte[] encoded) throws InvalidKeyException { RSAPrivateCrtKeyImpl key = new RSAPrivateCrtKeyImpl(encoded); if (key.getPublicExponent().signum() == 0) { // public exponent is missing, return a non-CRT key return new RSAPrivateKeyImpl( key.getModulus(), key.getPrivateExponent() ); } else { return key; } }
Construct a key from its encoding. Called from newKey above.
/** * Construct a key from its encoding. Called from newKey above. */
RSAPrivateCrtKeyImpl(byte[] encoded) throws InvalidKeyException { decode(encoded); RSAKeyFactory.checkRSAProviderKeyLengths(n.bitLength(), e); }
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. */
RSAPrivateCrtKeyImpl(BigInteger n, BigInteger e, BigInteger d, BigInteger p, BigInteger q, BigInteger pe, BigInteger qe, BigInteger coeff) throws InvalidKeyException { this.n = n; this.e = e; this.d = d; this.p = p; this.q = q; this.pe = pe; this.qe = qe; this.coeff = coeff; RSAKeyFactory.checkRSAProviderKeyLengths(n.bitLength(), e); // generate the encoding algid = rsaId; try { DerOutputStream out = new DerOutputStream(); out.putInteger(0); // version must be 0 out.putInteger(n); out.putInteger(e); out.putInteger(d); out.putInteger(p); out.putInteger(q); out.putInteger(pe); out.putInteger(qe); out.putInteger(coeff); 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 getPublicExponent() { return e; } // see JCA doc public BigInteger getPrivateExponent() { return d; } // see JCA doc public BigInteger getPrimeP() { return p; } // see JCA doc public BigInteger getPrimeQ() { return q; } // see JCA doc public BigInteger getPrimeExponentP() { return pe; } // see JCA doc public BigInteger getPrimeExponentQ() { return qe; } // see JCA doc public BigInteger getCrtCoefficient() { return coeff; }
Parse the key. Called by PKCS8Key.
/** * Parse the key. Called by PKCS8Key. */
protected void parseKeyBits() throws InvalidKeyException { try { DerInputStream in = new DerInputStream(key); DerValue derValue = in.getDerValue(); if (derValue.tag != DerValue.tag_Sequence) { throw new IOException("Not a SEQUENCE"); } DerInputStream data = derValue.data; int version = data.getInteger(); if (version != 0) { throw new IOException("Version must be 0"); } /* * Some implementations do not correctly encode ASN.1 INTEGER values * in 2's complement format, resulting in a negative integer when * decoded. Correct the error by converting it to a positive integer. * * See CR 6255949 */ n = data.getPositiveBigInteger(); e = data.getPositiveBigInteger(); d = data.getPositiveBigInteger(); p = data.getPositiveBigInteger(); q = data.getPositiveBigInteger(); pe = data.getPositiveBigInteger(); qe = data.getPositiveBigInteger(); coeff = data.getPositiveBigInteger(); if (derValue.data.available() != 0) { throw new IOException("Extra data available"); } } catch (IOException e) { throw new InvalidKeyException("Invalid RSA private key", e); } } }