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. --- libjava/classpath/gnu/javax/crypto/mode/EAX.java | 289 +++++++++++++++++++++++ 1 file changed, 289 insertions(+) create mode 100644 libjava/classpath/gnu/javax/crypto/mode/EAX.java (limited to 'libjava/classpath/gnu/javax/crypto/mode/EAX.java') diff --git a/libjava/classpath/gnu/javax/crypto/mode/EAX.java b/libjava/classpath/gnu/javax/crypto/mode/EAX.java new file mode 100644 index 000000000..b3e4a6a4e --- /dev/null +++ b/libjava/classpath/gnu/javax/crypto/mode/EAX.java @@ -0,0 +1,289 @@ +/* EAX.java -- + Copyright (C) 2004, 2006 Free Software Foundation, Inc. + +This file is a 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 of the License, 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; if not, write to the Free Software +Foundation, Inc., 51 Franklin St, 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 gnu.javax.crypto.mode; + +import gnu.java.security.Registry; +import gnu.javax.crypto.cipher.IBlockCipher; +import gnu.javax.crypto.mac.IMac; +import gnu.javax.crypto.mac.MacFactory; + +import java.security.InvalidKeyException; +import java.util.Arrays; +import java.util.Collections; +import java.util.HashMap; +import java.util.Iterator; +import java.util.Map; + +/** + * A conventional two-pass authenticated-encrypted mode, EAX. EAX is a + * Authenticated Encryption with Additional Data (AEAD) scheme, + * which provides protection and authentication for the message, and provides + * authentication of an (optional) header. EAX is composed of the counter mode + * (CTR) and the one-key CBC MAC (OMAC). + *

+ * This class makes full use of the {@link IAuthenticatedMode} interface, that + * is, all methods of both {@link IMode} and {@link IMac} can be used as + * specified in the {@link IAuthenticatedMode} interface. + *

+ * References: + *

    + *
  1. M. Bellare, P. Rogaway, and D. Wagner; A + * Conventional Authenticated-Encryption Mode.
    2. + *
+ */ +public class EAX + implements IAuthenticatedMode +{ + /** The tag size, in bytes. */ + private int tagSize; + /** The nonce OMAC instance. */ + private IMac nonceOmac; + /** The header OMAC instance. */ + private IMac headerOmac; + /** The message OMAC instance. */ + private IMac msgOmac; + /** The CTR instance. */ + private IMode ctr; + /** The direction state (encrypting or decrypting). */ + private int state; + /** Whether we're initialized or not. */ + private boolean init; + /** The cipher block size. */ + private int cipherBlockSize; + /** The cipher. */ + private IBlockCipher cipher; + /** The [t]_n array. */ + private byte[] t_n; + private static boolean valid = false; + + public EAX(IBlockCipher cipher, int cipherBlockSize) + { + this.cipher = cipher; + this.cipherBlockSize = cipherBlockSize; + String name = cipher.name(); + int i = name.indexOf('-'); + if (i >= 0) + name = name.substring(0, i); + String omacname = Registry.OMAC_PREFIX + name; + nonceOmac = MacFactory.getInstance(omacname); + headerOmac = MacFactory.getInstance(omacname); + msgOmac = MacFactory.getInstance(omacname); + ctr = ModeFactory.getInstance(Registry.CTR_MODE, cipher, cipherBlockSize); + t_n = new byte[cipherBlockSize]; + init = false; + } + + public Object clone() + { + return new EAX((IBlockCipher) cipher.clone(), cipherBlockSize); + } + + public String name() + { + return Registry.EAX_MODE + "(" + cipher.name() + ")"; + } + + public int defaultBlockSize() + { + return ctr.defaultBlockSize(); + } + + public int defaultKeySize() + { + return ctr.defaultKeySize(); + } + + public Iterator blockSizes() + { + return ctr.blockSizes(); + } + + public Iterator keySizes() + { + return ctr.keySizes(); + } + + public void init(Map attrib) throws InvalidKeyException + { + byte[] nonce = (byte[]) attrib.get(IV); + if (nonce == null) + throw new IllegalArgumentException("no nonce provided"); + byte[] key = (byte[]) attrib.get(KEY_MATERIAL); + if (key == null) + throw new IllegalArgumentException("no key provided"); + + Arrays.fill(t_n, (byte) 0); + nonceOmac.reset(); + nonceOmac.init(Collections.singletonMap(MAC_KEY_MATERIAL, key)); + nonceOmac.update(t_n, 0, t_n.length); + nonceOmac.update(nonce, 0, nonce.length); + byte[] N = nonceOmac.digest(); + nonceOmac.reset(); + nonceOmac.update(t_n, 0, t_n.length); + nonceOmac.update(nonce, 0, nonce.length); + t_n[t_n.length - 1] = 1; + headerOmac.reset(); + headerOmac.init(Collections.singletonMap(MAC_KEY_MATERIAL, key)); + headerOmac.update(t_n, 0, t_n.length); + t_n[t_n.length - 1] = 2; + msgOmac.reset(); + msgOmac.init(Collections.singletonMap(MAC_KEY_MATERIAL, key)); + msgOmac.update(t_n, 0, t_n.length); + Integer modeSize = (Integer) attrib.get(MODE_BLOCK_SIZE); + if (modeSize == null) + modeSize = Integer.valueOf(cipherBlockSize); + HashMap ctrAttr = new HashMap(); + ctrAttr.put(KEY_MATERIAL, key); + ctrAttr.put(IV, N); + ctrAttr.put(STATE, Integer.valueOf(ENCRYPTION)); + ctrAttr.put(MODE_BLOCK_SIZE, modeSize); + ctr.reset(); + ctr.init(ctrAttr); + Integer st = (Integer) attrib.get(STATE); + if (st != null) + { + state = st.intValue(); + if (state != ENCRYPTION && state != DECRYPTION) + throw new IllegalArgumentException("invalid state"); + } + else + state = ENCRYPTION; + + Integer ts = (Integer) attrib.get(TRUNCATED_SIZE); + if (ts != null) + tagSize = ts.intValue(); + else + tagSize = cipherBlockSize; + if (tagSize < 0 || tagSize > cipherBlockSize) + throw new IllegalArgumentException("tag size out of range"); + init = true; + } + + public int currentBlockSize() + { + return ctr.currentBlockSize(); + } + + public void encryptBlock(byte[] in, int inOff, byte[] out, int outOff) + { + if (! init) + throw new IllegalStateException("not initialized"); + if (state != ENCRYPTION) + throw new IllegalStateException("not encrypting"); + ctr.update(in, inOff, out, outOff); + msgOmac.update(out, outOff, ctr.currentBlockSize()); + } + + public void decryptBlock(byte[] in, int inOff, byte[] out, int outOff) + { + if (! init) + throw new IllegalStateException("not initialized"); + if (state != DECRYPTION) + throw new IllegalStateException("not decrypting"); + msgOmac.update(in, inOff, ctr.currentBlockSize()); + ctr.update(in, inOff, out, outOff); + } + + public void update(byte[] in, int inOff, byte[] out, int outOff) + { + switch (state) + { + case ENCRYPTION: + encryptBlock(in, inOff, out, outOff); + break; + case DECRYPTION: + decryptBlock(in, inOff, out, outOff); + break; + default: + throw new IllegalStateException("impossible state " + state); + } + } + + public void reset() + { + nonceOmac.reset(); + headerOmac.reset(); + msgOmac.reset(); + ctr.reset(); + } + + public boolean selfTest() + { + return true; // XXX + } + + public int macSize() + { + return tagSize; + } + + public byte[] digest() + { + byte[] tag = new byte[tagSize]; + digest(tag, 0); + return tag; + } + + public void digest(byte[] out, int outOffset) + { + if (outOffset < 0 || outOffset + tagSize > out.length) + throw new IndexOutOfBoundsException(); + byte[] N = nonceOmac.digest(); + byte[] H = headerOmac.digest(); + byte[] M = msgOmac.digest(); + for (int i = 0; i < tagSize; i++) + out[outOffset + i] = (byte)(N[i] ^ H[i] ^ M[i]); + reset(); + } + + public void update(byte b) + { + if (! init) + throw new IllegalStateException("not initialized"); + headerOmac.update(b); + } + + public void update(byte[] buf, int off, int len) + { + if (! init) + throw new IllegalStateException("not initialized"); + headerOmac.update(buf, off, len); + } +} -- cgit v1.2.3