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Diffstat (limited to 'libjava/classpath/java/security/MessageDigest.java')
| -rw-r--r-- | libjava/classpath/java/security/MessageDigest.java | 382 |
1 files changed, 0 insertions, 382 deletions
diff --git a/libjava/classpath/java/security/MessageDigest.java b/libjava/classpath/java/security/MessageDigest.java deleted file mode 100644 index a4eeab4..0000000 --- a/libjava/classpath/java/security/MessageDigest.java +++ /dev/null @@ -1,382 +0,0 @@ -/* MessageDigest.java --- The message digest interface. - Copyright (C) 1999, 2002, 2003, 2006 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 java.security; - -import gnu.java.lang.CPStringBuilder; - -import gnu.java.security.Engine; -import java.nio.ByteBuffer; - -import java.lang.reflect.InvocationTargetException; - -/** - * Message digests are secure one-way hash functions that take arbitrary-sized - * data and output a fixed-length hash value. - * - * @see MessageDigestSpi - * @since JDK 1.1 - */ -public abstract class MessageDigest extends MessageDigestSpi -{ - /** The service name for message digests. */ - private static final String MESSAGE_DIGEST = "MessageDigest"; - - private String algorithm; - Provider provider; - private byte[] lastDigest; - - /** - * Constructs a new instance of <code>MessageDigest</code> representing the - * specified algorithm. - * - * @param algorithm - * the name of the digest algorithm to use. - */ - protected MessageDigest(String algorithm) - { - this.algorithm = algorithm; - provider = null; - } - - /** - * Returns a new instance of <code>MessageDigest</code> representing the - * specified algorithm. - * - * @param algorithm the name of the digest algorithm to use. - * @return a new instance representing the desired algorithm. - * @throws NoSuchAlgorithmException if the algorithm is not implemented by any - * provider. - * @throws IllegalArgumentException if <code>algorithm</code> is - * <code>null</code> or is an empty string. - */ - public static MessageDigest getInstance(String algorithm) - throws NoSuchAlgorithmException - { - Provider[] p = Security.getProviders(); - NoSuchAlgorithmException lastException = null; - for (int i = 0; i < p.length; i++) - try - { - return getInstance(algorithm, p[i]); - } - catch (NoSuchAlgorithmException x) - { - lastException = x; - } - if (lastException != null) - throw lastException; - throw new NoSuchAlgorithmException(algorithm); - } - - /** - * Returns a new instance of <code>MessageDigest</code> representing the - * specified algorithm from a named provider. - * - * @param algorithm the name of the digest algorithm to use. - * @param provider the name of the provider to use. - * @return a new instance representing the desired algorithm. - * @throws NoSuchAlgorithmException if the algorithm is not implemented by the - * named provider. - * @throws NoSuchProviderException if the named provider was not found. - * @throws IllegalArgumentException if either <code>algorithm</code> or - * <code>provider</code> is <code>null</code> or empty. - */ - public static MessageDigest getInstance(String algorithm, String provider) - throws NoSuchAlgorithmException, NoSuchProviderException - { - if (provider == null) - throw new IllegalArgumentException("provider MUST NOT be null"); - provider = provider.trim(); - if (provider.length() == 0) - throw new IllegalArgumentException("provider MUST NOT be empty"); - Provider p = Security.getProvider(provider); - if (p == null) - throw new NoSuchProviderException(provider); - return getInstance(algorithm, p); - } - - /** - * Returns a new instance of <code>MessageDigest</code> representing the - * specified algorithm from a designated {@link Provider}. - * - * @param algorithm the name of the digest algorithm to use. - * @param provider the {@link Provider} to use. - * @return a new instance representing the desired algorithm. - * @throws NoSuchAlgorithmException if the algorithm is not implemented by - * {@link Provider}. - * @throws IllegalArgumentException if either <code>algorithm</code> or - * <code>provider</code> is <code>null</code>, or if - * <code>algorithm</code> is an empty string. - * @since 1.4 - * @see Provider - */ - public static MessageDigest getInstance(String algorithm, Provider provider) - throws NoSuchAlgorithmException - { - CPStringBuilder sb = new CPStringBuilder("MessageDigest for algorithm [") - .append(algorithm).append("] from provider[") - .append(provider).append("] "); - Object o; - try - { - o = Engine.getInstance(MESSAGE_DIGEST, algorithm, provider); - } - catch (InvocationTargetException x) - { - Throwable cause = x.getCause(); - if (cause instanceof NoSuchAlgorithmException) - throw (NoSuchAlgorithmException) cause; - if (cause == null) - cause = x; - sb.append("could not be created"); - NoSuchAlgorithmException y = new NoSuchAlgorithmException(sb.toString()); - y.initCause(cause); - throw y; - } - MessageDigest result; - if (o instanceof MessageDigestSpi) - result = new DummyMessageDigest((MessageDigestSpi) o, algorithm); - else if (o instanceof MessageDigest) - { - result = (MessageDigest) o; - result.algorithm = algorithm; - } - else - { - sb.append("is of an unexpected Type: ").append(o.getClass().getName()); - throw new NoSuchAlgorithmException(sb.toString()); - } - result.provider = provider; - return result; - } - - /** - * Returns the {@link Provider} of this instance. - * - * @return the {@link Provider} of this instance. - */ - public final Provider getProvider() - { - return provider; - } - - /** - * Updates the digest with the byte. - * - * @param input byte to update the digest with. - */ - public void update(byte input) - { - engineUpdate(input); - } - - /** - * Updates the digest with the bytes from the array starting from the - * specified offset and using the specified length of bytes. - * - * @param input - * bytes to update the digest with. - * @param offset - * the offset to start at. - * @param len - * length of the data to update with. - */ - public void update(byte[] input, int offset, int len) - { - engineUpdate(input, offset, len); - } - - /** - * Updates the digest with the bytes of an array. - * - * @param input bytes to update the digest with. - */ - public void update(byte[] input) - { - engineUpdate(input, 0, input.length); - } - - /** - * Updates the digest with the remaining bytes of a buffer. - * - * @param input The input byte buffer. - * @since 1.5 - */ - public final void update (ByteBuffer input) - { - engineUpdate (input); - } - - /** - * Computes the final digest of the stored data. - * - * @return a byte array representing the message digest. - */ - public byte[] digest() - { - return lastDigest = engineDigest(); - } - - /** - * Computes the final digest of the stored bytes and returns the result. - * - * @param buf - * an array of bytes to store the result in. - * @param offset - * an offset to start storing the result at. - * @param len - * the length of the buffer. - * @return Returns the length of the buffer. - */ - public int digest(byte[] buf, int offset, int len) throws DigestException - { - return engineDigest(buf, offset, len); - } - - /** - * Computes a final update using the input array of bytes, then computes a - * final digest and returns it. It calls {@link #update(byte[])} and then - * {@link #digest(byte[])}. - * - * @param input - * an array of bytes to perform final update with. - * @return a byte array representing the message digest. - */ - public byte[] digest(byte[] input) - { - update(input); - return digest(); - } - - /** - * Returns a string representation of this instance. - * - * @return a string representation of this instance. - */ - public String toString() - { - return (getClass()).getName() + " Message Digest <" + digestToString() + ">"; - } - - /** - * Does a simple byte comparison of the two digests. - * - * @param digesta - * first digest to compare. - * @param digestb - * second digest to compare. - * @return <code>true</code> if both are equal, <code>false</code> - * otherwise. - */ - public static boolean isEqual(byte[] digesta, byte[] digestb) - { - if (digesta.length != digestb.length) - return false; - - for (int i = digesta.length - 1; i >= 0; --i) - if (digesta[i] != digestb[i]) - return false; - - return true; - } - - /** Resets this instance. */ - public void reset() - { - engineReset(); - } - - /** - * Returns the name of message digest algorithm. - * - * @return the name of message digest algorithm. - */ - public final String getAlgorithm() - { - return algorithm; - } - - /** - * Returns the length of the message digest. The default is zero which means - * that the concrete implementation does not implement this method. - * - * @return length of the message digest. - * @since 1.2 - */ - public final int getDigestLength() - { - return engineGetDigestLength(); - } - - /** - * Returns a clone of this instance if cloning is supported. If it does not - * then a {@link CloneNotSupportedException} is thrown. Cloning depends on - * whether the subclass {@link MessageDigestSpi} implements {@link Cloneable} - * which contains the actual implementation of the appropriate algorithm. - * - * @return a clone of this instance. - * @throws CloneNotSupportedException - * the implementation does not support cloning. - */ - public Object clone() throws CloneNotSupportedException - { - return super.clone(); - } - - private String digestToString() - { - byte[] digest = lastDigest; - - if (digest == null) - return "incomplete"; - - CPStringBuilder buf = new CPStringBuilder(); - int len = digest.length; - for (int i = 0; i < len; ++i) - { - byte b = digest[i]; - byte high = (byte) ((b & 0xff) >>> 4); - byte low = (byte) (b & 0xf); - - buf.append(high > 9 ? ('a' - 10) + high : '0' + high); - buf.append(low > 9 ? ('a' - 10) + low : '0' + low); - } - - return buf.toString(); - } -} |