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Diffstat (limited to 'libjava/javax/crypto/KeyAgreement.java')
| -rw-r--r-- | libjava/javax/crypto/KeyAgreement.java | 372 |
1 files changed, 0 insertions, 372 deletions
diff --git a/libjava/javax/crypto/KeyAgreement.java b/libjava/javax/crypto/KeyAgreement.java deleted file mode 100644 index d71743e..0000000 --- a/libjava/javax/crypto/KeyAgreement.java +++ /dev/null @@ -1,372 +0,0 @@ -/* KeyAgreement.java -- Engine for key agreement methods. - Copyright (C) 2004 Free Software Foundation, Inc. - -This file is part of GNU Classpath. - -GNU Classpath is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 2, or (at your option) -any later version. - -GNU Classpath 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 for more details. - -You should have received a copy of the GNU General Public License -along with GNU Classpath; see the file COPYING. If not, write to the -Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA -02110-1301 USA. - -Linking this library statically or dynamically with other modules is -making a combined work based on this library. Thus, the terms and -conditions of the GNU General Public License cover the whole -combination. - -As a special exception, the copyright holders of this library give you -permission to link this library with independent modules to produce an -executable, regardless of the license terms of these independent -modules, and to copy and distribute the resulting executable under -terms of your choice, provided that you also meet, for each linked -independent module, the terms and conditions of the license of that -module. An independent module is a module which is not derived from -or based on this library. If you modify this library, you may extend -this exception to your version of the library, but you are not -obligated to do so. If you do not wish to do so, delete this -exception statement from your version. */ - - -package javax.crypto; - -import gnu.java.security.Engine; - -import java.lang.reflect.InvocationTargetException; -import java.security.InvalidAlgorithmParameterException; -import java.security.InvalidKeyException; -import java.security.Key; -import java.security.NoSuchAlgorithmException; -import java.security.NoSuchProviderException; -import java.security.Provider; -import java.security.SecureRandom; -import java.security.Security; -import java.security.spec.AlgorithmParameterSpec; - -/** - * Key agreement is a method in which two or more parties may agree on a - * secret key for symmetric cryptography or message authentication - * without transmitting any secrets in the clear. Key agreement - * algorithms typically use a public/private <i>key pair</i>, and the - * public key (along with some additional information) is sent across - * untrusted networks. - * - * <p>The most common form of key agreement used today is the - * <i>Diffie-Hellman key exchange algorithm</i>, described in <a - * href="http://www.rsasecurity.com/rsalabs/pkcs/pkcs-3/">PKCS #3 - - * Diffie Hellman Key Agreement Standard</a>. - * - * @author Casey Marshall (csm@gnu.org) - * @since 1.4 - * @see KeyGenerator - * @see SecretKey - */ -public class KeyAgreement -{ - - // Fields. - // ------------------------------------------------------------------------ - - private static final String SERVICE = "KeyAgreement"; - - /** The underlying key agreement implementation. */ - private KeyAgreementSpi kaSpi; - - /** The provider of this implementation. */ - private Provider provider; - - /** The name of this instance's algorithm. */ - private String algorithm; - - /** Singnals whether or not this instance has been initialized. */ - private boolean virgin; - - // Constructor. - // ------------------------------------------------------------------------ - - protected KeyAgreement(KeyAgreementSpi kaSpi, Provider provider, - String algorithm) - { - this.kaSpi = kaSpi; - this.provider = provider; - this.algorithm = algorithm; - virgin = true; - } - - // Class methods. - // ------------------------------------------------------------------------ - - /** - * Get an implementation of an algorithm from the first provider that - * implements it. - * - * @param algorithm The name of the algorithm to get. - * @return The proper KeyAgreement instacne, if found. - * @throws java.security.NoSuchAlgorithmException If the specified - * algorithm is not implemented by any installed provider. - */ - public static final KeyAgreement getInstance(String algorithm) - throws NoSuchAlgorithmException - { - Provider[] provs = Security.getProviders(); - String msg = algorithm; - for (int i = 0; i < provs.length; i++) - { - try - { - return getInstance(algorithm, provs[i]); - } - catch (NoSuchAlgorithmException nsae) - { - msg = nsae.getMessage(); - } - } - throw new NoSuchAlgorithmException(msg); - } - - /** - * Get an implementation of an algorithm from a named provider. - * - * @param algorithm The name of the algorithm to get. - * @param provider The name of the provider from which to get the - * implementation. - * @return The proper KeyAgreement instance, if found. - * @throws java.security.NoSuchAlgorithmException If the named provider - * does not implement the algorithm. - * @throws java.security.NoSuchProviderException If the named provider - * does not exist. - */ - public static final KeyAgreement getInstance(String algorithm, - String provider) - throws NoSuchAlgorithmException, NoSuchProviderException - { - Provider p = Security.getProvider(provider); - if (p == null) - { - throw new NoSuchProviderException(provider); - } - return getInstance(algorithm, p); - } - - /** - * Get an implementation of an algorithm from a specific provider. - * - * @param algorithm The name of the algorithm to get. - * @param provider The provider from which to get the implementation. - * @return The proper KeyAgreement instance, if found. - * @throws java.security.NoSuchAlgorithmException If this provider - * does not implement the algorithm. - */ - public static final KeyAgreement getInstance(String algorithm, - Provider provider) - throws NoSuchAlgorithmException - { - try - { - return new KeyAgreement((KeyAgreementSpi) - Engine.getInstance(SERVICE, algorithm, provider), - provider, algorithm); - } - catch (InvocationTargetException ite) - { - if (ite.getCause() == null) - throw new NoSuchAlgorithmException(algorithm); - if (ite.getCause() instanceof NoSuchAlgorithmException) - throw (NoSuchAlgorithmException) ite.getCause(); - throw new NoSuchAlgorithmException(algorithm); - } - catch (ClassCastException cce) - { - throw new NoSuchAlgorithmException(algorithm); - } - } - - // Instance methods. - // ------------------------------------------------------------------------ - - /** - * Do a phase in the key agreement. The number of times this method is - * called depends upon the algorithm and the number of parties - * involved, but must be called at least once with the - * <code>lastPhase</code> flag set to <code>true</code>. - * - * @param key The key for this phase. - * @param lastPhase Should be <code>true</code> if this will be the - * last phase before generating the shared secret. - * @return The intermediate result, or <code>null</code> if there is - * no intermediate result. - * @throws java.lang.IllegalStateException If this instance has not - * been initialized. - * @throws java.security.InvalidKeyException If the key is - * inappropriate for this algorithm. - */ - public final Key doPhase(Key key, boolean lastPhase) - throws IllegalStateException, InvalidKeyException - { - if (virgin) - { - throw new IllegalStateException("not initialized"); - } - return kaSpi.engineDoPhase(key, lastPhase); - } - - /** - * Generate the shared secret in a new byte array. - * - * @return The shared secret. - * @throws java.lang.IllegalStateException If this instnace has not - * been initialized, or if not enough calls to - * <code>doPhase</code> have been made. - */ - public final byte[] generateSecret() throws IllegalStateException - { - if (virgin) - { - throw new IllegalStateException("not initialized"); - } - return kaSpi.engineGenerateSecret(); - } - - /** - * Generate the shared secret and store it into the supplied array. - * - * @param sharedSecret The array in which to store the secret. - * @param offset The index in <code>sharedSecret</code> to start - * storing data. - * @return The length of the shared secret, in bytes. - * @throws java.lang.IllegalStateException If this instnace has not - * been initialized, or if not enough calls to - * <code>doPhase</code> have been made. - * @throws javax.crypto.ShortBufferException If the supplied array is - * not large enough to store the result. - */ - public final int generateSecret(byte[] sharedSecret, int offset) - throws IllegalStateException, ShortBufferException - { - if (virgin) - { - throw new IllegalStateException("not initialized"); - } - return kaSpi.engineGenerateSecret(sharedSecret, offset); - } - - /** - * Generate the shared secret and return it as an appropriate {@link - * SecretKey}. - * - * @param algorithm The secret key's algorithm. - * @return The shared secret as a secret key. - * @throws java.lang.IllegalStateException If this instnace has not - * been initialized, or if not enough calls to - * <code>doPhase</code> have been made. - * @throws java.security.InvalidKeyException If the shared secret - * cannot be used to make a {@link SecretKey}. - * @throws java.security.NoSuchAlgorithmException If the specified - * algorithm does not exist. - */ - public final SecretKey generateSecret(String algorithm) - throws IllegalStateException, InvalidKeyException, NoSuchAlgorithmException - { - if (virgin) - { - throw new IllegalStateException("not initialized"); - } - return kaSpi.engineGenerateSecret(algorithm); - } - - /** - * Return the name of this key-agreement algorithm. - * - * @return The algorithm name. - */ - public final String getAlgorithm() - { - return algorithm; - } - - /** - * Return the provider of the underlying implementation. - * - * @return The provider. - */ - public final Provider getProvider() - { - return provider; - } - - /** - * Initialize this key agreement with a key. This method will use the - * highest-priority {@link java.security.SecureRandom} as its source - * of randomness. - * - * @param key The key, usually the user's private key. - * @throws java.security.InvalidKeyException If the supplied key is - * not appropriate. - */ - public final void init(Key key) throws InvalidKeyException - { - init(key, new SecureRandom()); - } - - /** - * Initialize this key agreement with a key and a source of - * randomness. - * - * @param key The key, usually the user's private key. - * @param random The source of randomness. - * @throws java.security.InvalidKeyException If the supplied key is - * not appropriate. - */ - public final void init(Key key, SecureRandom random) - throws InvalidKeyException - { - kaSpi.engineInit(key, random); - virgin = false; // w00t! - } - - /** - * Initialize this key agreement with a key and parameters. This - * method will use the highest-priority {@link - * java.security.SecureRandom} as its source of randomness. - * - * @param key The key, usually the user's private key. - * @param params The algorithm parameters. - * @throws java.security.InvalidAlgorithmParameterException If the - * supplied parameters are not appropriate. - * @throws java.security.InvalidKeyException If the supplied key is - * not appropriate. - */ - public final void init(Key key, AlgorithmParameterSpec params) - throws InvalidAlgorithmParameterException, InvalidKeyException - { - init(key, params, new SecureRandom()); - } - - /** - * Initialize this key agreement with a key, parameters, and source of - * randomness. - * - * @param key The key, usually the user's private key. - * @param params The algorithm parameters. - * @param random The source of randomness. - * @throws java.security.InvalidAlgorithmParameterException If the - * supplied parameters are not appropriate. - * @throws java.security.InvalidKeyException If the supplied key is - * not appropriate. - */ - public final void init(Key key, AlgorithmParameterSpec params, - SecureRandom random) - throws InvalidAlgorithmParameterException, InvalidKeyException - { - kaSpi.engineInit(key, params, random); - virgin = false; // w00t! - } -} |