From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- .../classpath/java/security/MessageDigestSpi.java | 174 +++++++++++++++++++++ 1 file changed, 174 insertions(+) create mode 100644 libjava/classpath/java/security/MessageDigestSpi.java (limited to 'libjava/classpath/java/security/MessageDigestSpi.java') diff --git a/libjava/classpath/java/security/MessageDigestSpi.java b/libjava/classpath/java/security/MessageDigestSpi.java new file mode 100644 index 000000000..63cc96047 --- /dev/null +++ b/libjava/classpath/java/security/MessageDigestSpi.java @@ -0,0 +1,174 @@ +/* MessageDigestSpi.java --- The message digest service provider interface. + Copyright (C) 1999, 2005 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 java.nio.ByteBuffer; + +/** + This is the Service Provider Interface (SPI) for MessageDigest + class in java.security. It provides the back end functionality + for the MessageDigest class so that it can compute message + hashes. The default hashes are SHA-1 and MD5. A message hash + takes data of arbitrary length and produces a unique number + representing it. + + Cryptography service providers who want to implement their + own message digest hashes need only to subclass this class. + + The implementation of a Cloneable interface is left to up to + the programmer of a subclass. + + @version 0.0 + + @author Mark Benvenuto (ivymccough@worldnet.att.net) + */ +public abstract class MessageDigestSpi +{ + /** + Default constructor of the MessageDigestSpi class + */ + public MessageDigestSpi() + { + } + + /** + Returns the length of the digest. It may be overridden by the + provider to return the length of the digest. Default is to + return 0. It is concrete for backwards compatibility with JDK1.1 + message digest classes. + + @return Length of Digest in Bytes + + @since 1.2 + */ + protected int engineGetDigestLength() + { + return 0; + } + + /** + Updates the digest with the specified byte. + + @param input the byte to update digest with + */ + protected abstract void engineUpdate(byte input); + + + /** + Updates the digest with the specified bytes starting with the + offset and proceeding for the specified length. + + @param input the byte array to update digest with + @param offset the offset of the byte to start with + @param len the number of the bytes to update with + */ + protected abstract void engineUpdate(byte[]input, int offset, int len); + + /** + * Updates this digest with the remaining bytes of a byte buffer. + * + * @param input The input buffer. + * @since 1.5 + */ + protected void engineUpdate (ByteBuffer input) + { + byte[] buf = new byte[1024]; + while (input.hasRemaining()) + { + int n = Math.min(input.remaining(), buf.length); + input.get (buf, 0, n); + engineUpdate (buf, 0, n); + } + } + + /** + Computes the final digest of the stored bytes and returns + them. It performs any necessary padding. The message digest + should reset sensitive data after performing the digest. + + @return An array of bytes containing the digest + */ + protected abstract byte[] engineDigest(); + + /** + Computes the final digest of the stored bytes and returns + them. It performs any necessary padding. The message digest + should reset sensitive data after performing the digest. This + method is left concrete for backwards compatibility with JDK1.1 + message digest classes. + + @param buf An array of bytes to store the digest + @param offset An offset to start storing the digest at + @param len The length of the buffer + @return Returns the length of the buffer + + @since 1.2 + */ + protected int engineDigest(byte[]buf, int offset, int len) + throws DigestException + { + if (engineGetDigestLength() > len) + throw new DigestException("Buffer is too small."); + + byte[] tmp = engineDigest(); + if (tmp.length > len) + throw new DigestException("Buffer is too small"); + + System.arraycopy(tmp, 0, buf, offset, tmp.length); + return tmp.length; + } + + /** + Resets the digest engine. Reinitializes internal variables + and clears sensitive data. + */ + protected abstract void engineReset(); + + /** + Returns a clone of this class. + + If cloning is not supported, then by default the class throws a + CloneNotSupportedException. The MessageDigestSpi provider + implementation has to overload this class in order to be + cloneable. + */ + public Object clone() throws CloneNotSupportedException + { + return super.clone(); + } +} -- cgit v1.2.3