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verified gcc-4.6.4.tar.bz2.sig;
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downloading a git-generated archive based on the 'upstream' tag
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1 files changed, 299 insertions, 0 deletions

diff --git a/libjava/classpath/gnu/javax/crypto/RSACipherImpl.java b/libjava/classpath/gnu/javax/crypto/RSACipherImpl.java
new file mode 100644
index 000000000..a4adff007
--- /dev/null
+++ b/libjava/classpath/gnu/javax/crypto/RSACipherImpl.java
@@ -0,0 +1,299 @@
+/* RSACipherImpl.java --
+   Copyright (C) 2005, 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 gnu.javax.crypto;
+
+import gnu.classpath.debug.Component;
+import gnu.classpath.debug.SystemLogger;
+import gnu.java.security.sig.rsa.EME_PKCS1_V1_5;
+import gnu.java.security.util.ByteArray;
+
+import java.math.BigInteger;
+import java.security.AlgorithmParameters;
+import java.security.InvalidKeyException;
+import java.security.Key;
+import java.security.NoSuchAlgorithmException;
+import java.security.SecureRandom;
+import java.security.interfaces.RSAKey;
+import java.security.interfaces.RSAPrivateCrtKey;
+import java.security.interfaces.RSAPrivateKey;
+import java.security.interfaces.RSAPublicKey;
+import java.security.spec.AlgorithmParameterSpec;
+
+import javax.crypto.BadPaddingException;
+import javax.crypto.Cipher;
+import javax.crypto.CipherSpi;
+import javax.crypto.IllegalBlockSizeException;
+import javax.crypto.NoSuchPaddingException;
+import javax.crypto.ShortBufferException;
+
+public class RSACipherImpl
+    extends CipherSpi
+{
+  private static final SystemLogger logger = SystemLogger.SYSTEM;
+
+  private static final byte[] EMPTY = new byte[0];
+  private int opmode = -1;
+  private RSAPrivateKey decipherKey = null;
+  private RSAPublicKey blindingKey = null;
+  private RSAPublicKey encipherKey = null;
+  private SecureRandom random = null;
+  private byte[] dataBuffer = null;
+  private int pos = 0;
+
+  protected void engineSetMode(String mode) throws NoSuchAlgorithmException
+  {
+    throw new NoSuchAlgorithmException("only one mode available");
+  }
+
+  protected void engineSetPadding(String pad) throws NoSuchPaddingException
+  {
+    throw new NoSuchPaddingException("only one padding available");
+  }
+
+  protected int engineGetBlockSize()
+  {
+    return 1;
+  }
+
+  protected int engineGetOutputSize(int inputLen)
+  {
+    int outputLen = 0;
+    if (decipherKey != null)
+      outputLen = (decipherKey.getModulus().bitLength() + 7) / 8;
+    else if (encipherKey != null)
+      outputLen = (encipherKey.getModulus().bitLength() + 7) / 8;
+    else
+      throw new IllegalStateException("not initialized");
+    if (inputLen > outputLen)
+      throw new IllegalArgumentException("not configured to encode " + inputLen
+                                         + "bytes; at most " + outputLen);
+    return outputLen;
+  }
+
+  protected int engineGetKeySize(final Key key) throws InvalidKeyException
+  {
+    if (! (key instanceof RSAKey))
+      throw new InvalidKeyException("not an RSA key");
+    return ((RSAKey) key).getModulus().bitLength();
+  }
+
+  protected byte[] engineGetIV()
+  {
+    return null;
+  }
+
+  protected AlgorithmParameters engineGetParameters()
+  {
+    return null;
+  }
+
+  protected void engineInit(int opmode, Key key, SecureRandom random)
+      throws InvalidKeyException
+  {
+    int outputLen = 0;
+    if (opmode == Cipher.ENCRYPT_MODE)
+      {
+        if (! (key instanceof RSAPublicKey))
+          throw new InvalidKeyException("expecting a RSAPublicKey");
+        encipherKey = (RSAPublicKey) key;
+        decipherKey = null;
+        blindingKey = null;
+        outputLen = (encipherKey.getModulus().bitLength() + 7) / 8;
+      }
+    else if (opmode == Cipher.DECRYPT_MODE)
+      {
+        if (key instanceof RSAPrivateKey)
+          {
+            decipherKey = (RSAPrivateKey) key;
+            encipherKey = null;
+            blindingKey = null;
+            outputLen = (decipherKey.getModulus().bitLength() + 7) / 8;
+          }
+        else if (key instanceof RSAPublicKey)
+          {
+            if (decipherKey == null)
+              throw new IllegalStateException("must configure decryption key first");
+            if (! decipherKey.getModulus().equals(((RSAPublicKey) key).getModulus()))
+              throw new InvalidKeyException("blinding key is not compatible");
+            blindingKey = (RSAPublicKey) key;
+            return;
+          }
+        else
+          throw new InvalidKeyException(
+              "expecting either an RSAPrivateKey or an RSAPublicKey (for blinding)");
+      }
+    else
+      throw new IllegalArgumentException("only encryption and decryption supported");
+    this.random = random;
+    this.opmode = opmode;
+    pos = 0;
+    dataBuffer = new byte[outputLen];
+  }
+
+  protected void engineInit(int opmode, Key key, AlgorithmParameterSpec spec,
+                            SecureRandom random) throws InvalidKeyException
+  {
+    engineInit(opmode, key, random);
+  }
+
+  protected void engineInit(int opmode, Key key, AlgorithmParameters params,
+                            SecureRandom random) throws InvalidKeyException
+  {
+    engineInit(opmode, key, random);
+  }
+
+  protected byte[] engineUpdate(byte[] in, int offset, int length)
+  {
+    if (opmode != Cipher.ENCRYPT_MODE && opmode != Cipher.DECRYPT_MODE)
+      throw new IllegalStateException("not initialized");
+    System.arraycopy(in, offset, dataBuffer, pos, length);
+    pos += length;
+    return EMPTY;
+  }
+
+  protected int engineUpdate(byte[] in, int offset, int length, byte[] out,
+                             int outOffset)
+  {
+    engineUpdate(in, offset, length);
+    return 0;
+  }
+
+  protected byte[] engineDoFinal(byte[] in, int offset, int length)
+      throws IllegalBlockSizeException, BadPaddingException
+  {
+    engineUpdate(in, offset, length);
+    if (opmode == Cipher.DECRYPT_MODE)
+      {
+        BigInteger enc = new BigInteger (1, dataBuffer);
+        byte[] dec = rsaDecrypt (enc);
+        logger.log (Component.CRYPTO, "RSA: decryption produced\n{0}",
+                    new ByteArray (dec));
+        EME_PKCS1_V1_5 pkcs = EME_PKCS1_V1_5.getInstance(decipherKey);
+        byte[] result = pkcs.decode(dec);
+        return result;
+      }
+    else
+      {
+        offset = dataBuffer.length - pos;
+        if (offset < 3)
+          throw new IllegalBlockSizeException("input is too large to encrypt");
+        EME_PKCS1_V1_5 pkcs = EME_PKCS1_V1_5.getInstance(encipherKey);
+        if (random == null)
+          random = new SecureRandom();
+        byte[] em = new byte[pos];
+        System.arraycopy(dataBuffer, 0, em, 0, pos);
+        byte[] dec = pkcs.encode(em, random);
+        logger.log (Component.CRYPTO, "RSA: produced padded plaintext\n{0}",
+                    new ByteArray (dec));
+        BigInteger x = new BigInteger (1, dec);
+        BigInteger y = x.modPow (encipherKey.getPublicExponent (),
+                                 encipherKey.getModulus ());
+        byte[] enc = y.toByteArray ();
+        if (enc[0] == 0x00)
+          {
+            byte[] tmp = new byte[enc.length - 1];
+            System.arraycopy(enc, 1, tmp, 0, tmp.length);
+            enc = tmp;
+          }
+        pos = 0;
+        return enc;
+      }
+  }
+
+  protected int engineDoFinal(byte[] out, int offset)
+      throws ShortBufferException, IllegalBlockSizeException,
+      BadPaddingException
+  {
+    byte[] result = engineDoFinal(EMPTY, 0, 0);
+    if (out.length - offset < result.length)
+      throw new ShortBufferException("need " + result.length + ", have "
+                                     + (out.length - offset));
+    System.arraycopy(result, 0, out, offset, result.length);
+    return result.length;
+  }
+
+  protected int engineDoFinal(final byte[] input, final int offset,
+                              final int length, final byte[] output,
+                              final int outputOffset)
+      throws ShortBufferException, IllegalBlockSizeException,
+      BadPaddingException
+  {
+    byte[] result = engineDoFinal(input, offset, length);
+    if (output.length - outputOffset < result.length)
+      throw new ShortBufferException("need " + result.length + ", have "
+                                     + (output.length - outputOffset));
+    System.arraycopy(result, 0, output, outputOffset, result.length);
+    return result.length;
+  }
+
+  /**
+   * Decrypts the ciphertext, employing RSA blinding if possible.
+   */
+  private byte[] rsaDecrypt(BigInteger enc)
+  {
+    if (random == null)
+      random = new SecureRandom();
+    BigInteger n = decipherKey.getModulus();
+    BigInteger r = null;
+    BigInteger pubExp = null;
+    if (blindingKey != null)
+      pubExp = blindingKey.getPublicExponent();
+    if (pubExp != null && (decipherKey instanceof RSAPrivateCrtKey))
+      pubExp = ((RSAPrivateCrtKey) decipherKey).getPublicExponent();
+    if (pubExp != null)
+      {
+        r = new BigInteger(n.bitLength() - 1, random);
+        enc = r.modPow(pubExp, n).multiply(enc).mod(n);
+      }
+    BigInteger dec = enc.modPow(decipherKey.getPrivateExponent(), n);
+    if (pubExp != null)
+      {
+        dec = dec.multiply (r.modInverse (n)).mod (n);
+      }
+
+    byte[] decb = dec.toByteArray();
+    if (decb[0] != 0x00)
+      {
+        byte[] b = new byte[decb.length + 1];
+        System.arraycopy(decb, 0, b, 1, decb.length);
+        decb = b;
+      }
+    return decb;
+  }
+}