/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * particular file as subject to the "Classpath" exception as provided

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 */

package sun.security.pkcs11;

import java.math.BigInteger;

import java.security.*;

import java.security.interfaces.*;

import java.security.spec.*;

import static sun.security.pkcs11.TemplateManager.*;

import sun.security.pkcs11.wrapper.*;

import static sun.security.pkcs11.wrapper.PKCS11Constants.*;

import sun.security.rsa.RSAKeyFactory;

/**

 * RSA KeyFactory implemenation.

 *

 * @author  Andreas Sterbenz

 * @since   1.5

 */

final class P11RSAKeyFactory extends P11KeyFactory {

    P11RSAKeyFactory(Token token, String algorithm) {

        super(token, algorithm);

    }

    PublicKey implTranslatePublicKey(PublicKey key) throws InvalidKeyException {

        try {

            if (key instanceof RSAPublicKey) {

                RSAPublicKey rsaKey = (RSAPublicKey)key;

                return generatePublic(

                    rsaKey.getModulus(),

                    rsaKey.getPublicExponent()

                );

            } else if ("X.509".equals(key.getFormat())) {

                // let SunRsaSign provider parse for us, then recurse

                byte[] encoded = key.getEncoded();

                key = new sun.security.rsa.RSAPublicKeyImpl(encoded);

                return implTranslatePublicKey(key);

            } else {

                throw new InvalidKeyException("PublicKey must be instance "

                        + "of RSAPublicKey or have X.509 encoding");

            }

        } catch (PKCS11Exception e) {

            throw new InvalidKeyException("Could not create RSA public key", e);

        }

    }

    PrivateKey implTranslatePrivateKey(PrivateKey key)

            throws InvalidKeyException {

        try {

            if (key instanceof RSAPrivateCrtKey) {

                RSAPrivateCrtKey rsaKey = (RSAPrivateCrtKey)key;

                return generatePrivate(

                    rsaKey.getModulus(),

                    rsaKey.getPublicExponent(),

                    rsaKey.getPrivateExponent(),

                    rsaKey.getPrimeP(),

                    rsaKey.getPrimeQ(),

                    rsaKey.getPrimeExponentP(),

                    rsaKey.getPrimeExponentQ(),

                    rsaKey.getCrtCoefficient()

                );

            } else if (key instanceof RSAPrivateKey) {

                RSAPrivateKey rsaKey = (RSAPrivateKey)key;

                return generatePrivate(

                    rsaKey.getModulus(),

                    rsaKey.getPrivateExponent()

                );

            } else if ("PKCS#8".equals(key.getFormat())) {

                // let SunRsaSign provider parse for us, then recurse

                byte[] encoded = key.getEncoded();

                key = sun.security.rsa.RSAPrivateCrtKeyImpl.newKey(encoded);

                return implTranslatePrivateKey(key);

            } else {

                throw new InvalidKeyException("Private key must be instance "

                        + "of RSAPrivate(Crt)Key or have PKCS#8 encoding");

            }

        } catch (PKCS11Exception e) {

            throw new InvalidKeyException("Could not create RSA private key", e);

        }

    }

    // see JCA spec

    protected PublicKey engineGeneratePublic(KeySpec keySpec)

            throws InvalidKeySpecException {

        token.ensureValid();

        if (keySpec instanceof X509EncodedKeySpec) {

            try {

                byte[] encoded = ((X509EncodedKeySpec)keySpec).getEncoded();

                PublicKey key = new sun.security.rsa.RSAPublicKeyImpl(encoded);

                return implTranslatePublicKey(key);

            } catch (InvalidKeyException e) {

                throw new InvalidKeySpecException

                        ("Could not create RSA public key", e);

            }

        }

        if (keySpec instanceof RSAPublicKeySpec == false) {

            throw new InvalidKeySpecException("Only RSAPublicKeySpec and "

                + "X509EncodedKeySpec supported for RSA public keys");

        }

        try {

            RSAPublicKeySpec rs = (RSAPublicKeySpec)keySpec;

            return generatePublic(

                rs.getModulus(),

                rs.getPublicExponent()

            );

        } catch (PKCS11Exception e) {

            throw new InvalidKeySpecException

                ("Could not create RSA public key", e);

        } catch (InvalidKeyException e) {

            throw new InvalidKeySpecException

                ("Could not create RSA public key", e);

        }

    }

    // see JCA spec

    protected PrivateKey engineGeneratePrivate(KeySpec keySpec)

            throws InvalidKeySpecException {

        token.ensureValid();

        if (keySpec instanceof PKCS8EncodedKeySpec) {

            try {

                byte[] encoded = ((PKCS8EncodedKeySpec)keySpec).getEncoded();

                PrivateKey key =

                        sun.security.rsa.RSAPrivateCrtKeyImpl.newKey(encoded);

                return implTranslatePrivateKey(key);

            } catch (GeneralSecurityException e) {

                throw new InvalidKeySpecException

                        ("Could not create RSA private key", e);

            }

        }

        try {

            if (keySpec instanceof RSAPrivateCrtKeySpec) {

                RSAPrivateCrtKeySpec rs = (RSAPrivateCrtKeySpec)keySpec;

                return generatePrivate(

                    rs.getModulus(),

                    rs.getPublicExponent(),

                    rs.getPrivateExponent(),

                    rs.getPrimeP(),

                    rs.getPrimeQ(),

                    rs.getPrimeExponentP(),

                    rs.getPrimeExponentQ(),

                    rs.getCrtCoefficient()

                );

            } else if (keySpec instanceof RSAPrivateKeySpec) {

                RSAPrivateKeySpec rs = (RSAPrivateKeySpec)keySpec;

                return generatePrivate(

                    rs.getModulus(),

                    rs.getPrivateExponent()

                );

            } else {

                throw new InvalidKeySpecException("Only RSAPrivate(Crt)KeySpec "

                    + "and PKCS8EncodedKeySpec supported for RSA private keys");

            }

        } catch (PKCS11Exception e) {

            throw new InvalidKeySpecException

                ("Could not create RSA private key", e);

        } catch (InvalidKeyException e) {

            throw new InvalidKeySpecException

                ("Could not create RSA private key", e);

        }

    }

    private PublicKey generatePublic(BigInteger n, BigInteger e)

            throws PKCS11Exception, InvalidKeyException {

        RSAKeyFactory.checkKeyLengths(n.bitLength(), e, -1, 64 * 1024);

        CK_ATTRIBUTE[] attributes = new CK_ATTRIBUTE[] {

            new CK_ATTRIBUTE(CKA_CLASS, CKO_PUBLIC_KEY),

            new CK_ATTRIBUTE(CKA_KEY_TYPE, CKK_RSA),

            new CK_ATTRIBUTE(CKA_MODULUS, n),

            new CK_ATTRIBUTE(CKA_PUBLIC_EXPONENT, e),

        };

        attributes = token.getAttributes

                (O_IMPORT, CKO_PUBLIC_KEY, CKK_RSA, attributes);

        Session session = null;

        try {

            session = token.getObjSession();

            long keyID = token.p11.C_CreateObject(session.id(), attributes);

            return P11Key.publicKey

                (session, keyID, "RSA", n.bitLength(), attributes);

        } finally {

            token.releaseSession(session);

        }

    }

    private PrivateKey generatePrivate(BigInteger n, BigInteger d)

            throws PKCS11Exception, InvalidKeyException {

        RSAKeyFactory.checkKeyLengths(n.bitLength(), null, -1, 64 * 1024);

        CK_ATTRIBUTE[] attributes = new CK_ATTRIBUTE[] {

            new CK_ATTRIBUTE(CKA_CLASS, CKO_PRIVATE_KEY),

            new CK_ATTRIBUTE(CKA_KEY_TYPE, CKK_RSA),

            new CK_ATTRIBUTE(CKA_MODULUS, n),

            new CK_ATTRIBUTE(CKA_PRIVATE_EXPONENT, d),

        };

        attributes = token.getAttributes

                (O_IMPORT, CKO_PRIVATE_KEY, CKK_RSA, attributes);

        Session session = null;

        try {

            session = token.getObjSession();

            long keyID = token.p11.C_CreateObject(session.id(), attributes);

            return P11Key.privateKey

                (session,  keyID, "RSA", n.bitLength(), attributes);

        } finally {

            token.releaseSession(session);

        }

    }

    private PrivateKey generatePrivate(BigInteger n, BigInteger e,

            BigInteger d, BigInteger p, BigInteger q, BigInteger pe,

            BigInteger qe, BigInteger coeff) throws PKCS11Exception,

            InvalidKeyException {

        RSAKeyFactory.checkKeyLengths(n.bitLength(), e, -1, 64 * 1024);

        CK_ATTRIBUTE[] attributes = new CK_ATTRIBUTE[] {

            new CK_ATTRIBUTE(CKA_CLASS, CKO_PRIVATE_KEY),

            new CK_ATTRIBUTE(CKA_KEY_TYPE, CKK_RSA),

            new CK_ATTRIBUTE(CKA_MODULUS, n),

            new CK_ATTRIBUTE(CKA_PUBLIC_EXPONENT, e),

            new CK_ATTRIBUTE(CKA_PRIVATE_EXPONENT, d),

            new CK_ATTRIBUTE(CKA_PRIME_1, p),

            new CK_ATTRIBUTE(CKA_PRIME_2, q),

            new CK_ATTRIBUTE(CKA_EXPONENT_1, pe),

            new CK_ATTRIBUTE(CKA_EXPONENT_2, qe),

            new CK_ATTRIBUTE(CKA_COEFFICIENT, coeff),

        };

        attributes = token.getAttributes

                (O_IMPORT, CKO_PRIVATE_KEY, CKK_RSA, attributes);

        Session session = null;

        try {

            session = token.getObjSession();

            long keyID = token.p11.C_CreateObject(session.id(), attributes);

            return P11Key.privateKey

                (session, keyID, "RSA", n.bitLength(), attributes);

        } finally {

            token.releaseSession(session);

        }

    }

    KeySpec implGetPublicKeySpec(P11Key key, Class keySpec, Session[] session)

            throws PKCS11Exception, InvalidKeySpecException {

        if (RSAPublicKeySpec.class.isAssignableFrom(keySpec)) {

            session[0] = token.getObjSession();

            CK_ATTRIBUTE[] attributes = new CK_ATTRIBUTE[] {

                new CK_ATTRIBUTE(CKA_MODULUS),

                new CK_ATTRIBUTE(CKA_PUBLIC_EXPONENT),

            };

            token.p11.C_GetAttributeValue(session[0].id(), key.keyID, attributes);

            KeySpec spec = new RSAPublicKeySpec(

                attributes[0].getBigInteger(),

                attributes[1].getBigInteger()

            );

            return spec;

        } else { // X.509 handled in superclass

            throw new InvalidKeySpecException("Only RSAPublicKeySpec and "

                + "X509EncodedKeySpec supported for RSA public keys");

        }

    }

    KeySpec implGetPrivateKeySpec(P11Key key, Class keySpec, Session[] session)

            throws PKCS11Exception, InvalidKeySpecException {

        if (RSAPrivateCrtKeySpec.class.isAssignableFrom(keySpec)) {

            session[0] = token.getObjSession();

            CK_ATTRIBUTE[] attributes = new CK_ATTRIBUTE[] {

                new CK_ATTRIBUTE(CKA_MODULUS),

                new CK_ATTRIBUTE(CKA_PUBLIC_EXPONENT),

                new CK_ATTRIBUTE(CKA_PRIVATE_EXPONENT),

                new CK_ATTRIBUTE(CKA_PRIME_1),

                new CK_ATTRIBUTE(CKA_PRIME_2),

                new CK_ATTRIBUTE(CKA_EXPONENT_1),

                new CK_ATTRIBUTE(CKA_EXPONENT_2),

                new CK_ATTRIBUTE(CKA_COEFFICIENT),

            };

            token.p11.C_GetAttributeValue(session[0].id(), key.keyID, attributes);

            KeySpec spec = new RSAPrivateCrtKeySpec(

                attributes[0].getBigInteger(),

                attributes[1].getBigInteger(),

                attributes[2].getBigInteger(),

                attributes[3].getBigInteger(),

                attributes[4].getBigInteger(),

                attributes[5].getBigInteger(),

                attributes[6].getBigInteger(),

                attributes[7].getBigInteger()

            );

            return spec;

        } else if (RSAPrivateKeySpec.class.isAssignableFrom(keySpec)) {

            session[0] = token.getObjSession();

            CK_ATTRIBUTE[] attributes = new CK_ATTRIBUTE[] {

                new CK_ATTRIBUTE(CKA_MODULUS),

                new CK_ATTRIBUTE(CKA_PRIVATE_EXPONENT),

            };

            token.p11.C_GetAttributeValue(session[0].id(), key.keyID, attributes);

            KeySpec spec = new RSAPrivateKeySpec(

                attributes[0].getBigInteger(),

                attributes[1].getBigInteger()

            );

            return spec;

        } else { // PKCS#8 handled in superclass

            throw new InvalidKeySpecException("Only RSAPrivate(Crt)KeySpec "

                + "and PKCS8EncodedKeySpec supported for RSA private keys");

        }

    }

    KeyFactory implGetSoftwareFactory() throws GeneralSecurityException {

        return KeyFactory.getInstance("RSA", P11Util.getSunRsaSignProvider());

    }

}