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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/javax/crypto/sasl/OutputBuffer.java | |
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Diffstat (limited to 'libjava/classpath/gnu/javax/crypto/sasl/OutputBuffer.java')
-rw-r--r-- | libjava/classpath/gnu/javax/crypto/sasl/OutputBuffer.java | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/javax/crypto/sasl/OutputBuffer.java b/libjava/classpath/gnu/javax/crypto/sasl/OutputBuffer.java new file mode 100644 index 000000000..4bb3b0ec2 --- /dev/null +++ b/libjava/classpath/gnu/javax/crypto/sasl/OutputBuffer.java @@ -0,0 +1,198 @@ +/* OutputBuffer.java -- + Copyright (C) 2003, 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.sasl; + +import gnu.java.security.Registry; +import gnu.java.security.util.Util; + +import java.io.ByteArrayOutputStream; +import java.io.IOException; +import java.math.BigInteger; + +/** + * The implementation of an outgoing SASL buffer. + * <p> + * The data elements this class caters for are described in [1]. + * <p> + * References: + * <ol> + * <li><a + * href="http://www.ietf.org/internet-drafts/draft-burdis-cat-srp-sasl-09.txt"> + * Secure Remote Password Authentication Mechanism</a>;<br/> + * draft-burdis-cat-srp-sasl-09,<br/> <a + * href="mailto:keith@rucus.ru.ac.za">Keith Burdis</a> and <a + * href="mailto:raif@forge.com.au">Raïf S. Naffah</a>.</li> + * </ol> + */ +public class OutputBuffer +{ + /** The internal output stream. */ + private ByteArrayOutputStream out; + + public OutputBuffer() + { + super(); + + out = new ByteArrayOutputStream(); + } + + /** + * Encodes a SASL scalar quantity, <code>count</code>-octet long, to the + * current buffer. + * + * @param count number of octets to encode <code>b</code> with. + * @param b the scalar quantity. + * @throws SaslEncodingException if an encoding size constraint is violated. + * @throws IOException if any other I/O exception occurs during the operation. + */ + public void setScalar(int count, int b) throws IOException + { + if (count < 0 || count > 4) + throw new SaslEncodingException("Invalid SASL scalar octet count: " + + String.valueOf(count)); + byte[] element = new byte[count]; + for (int i = count; --i >= 0; b >>>= 8) + element[i] = (byte) b; + out.write(element); + } + + /** + * Encodes a SASL OS to the current buffer. + * + * @param b the OS element. + * @throws SaslEncodingException if an encoding size constraint is violated. + * @throws IOException if any other I/O exception occurs during the operation. + */ + public void setOS(byte[] b) throws IOException + { + final int length = b.length; + if (length > Registry.SASL_ONE_BYTE_MAX_LIMIT) + throw new SaslEncodingException("SASL octet-sequence too long"); + out.write(length & 0xFF); + out.write(b); + } + + /** + * Encodes a SASL EOS to the current buffer. + * + * @param b the EOS element. + * @throws SaslEncodingException if an encoding size constraint is violated. + * @throws IOException if any other I/O exception occurs during the operation. + */ + public void setEOS(byte[] b) throws IOException + { + final int length = b.length; + if (length > Registry.SASL_TWO_BYTE_MAX_LIMIT) + throw new SaslEncodingException("SASL extended octet-sequence too long"); + byte[] lengthBytes = { (byte)(length >>> 8), (byte) length }; + out.write(lengthBytes); + out.write(b); + } + + /** + * Encodes a SASL MPI to the current buffer. + * + * @param val the MPI element. + * @throws SaslEncodingException if an encoding size constraint is violated. + * @throws IOException if any other I/O exception occurs during the operation. + */ + public void setMPI(BigInteger val) throws IOException + { + byte[] b = Util.trim(val); + final int length = b.length; + if (length > Registry.SASL_TWO_BYTE_MAX_LIMIT) + throw new SaslEncodingException("SASL multi-precision integer too long"); + byte[] lengthBytes = { (byte)(length >>> 8), (byte) length }; + out.write(lengthBytes); + out.write(b); + } + + /** + * Encodes a SASL Text to the current buffer. + * + * @param str the Text element. + * @throws SaslEncodingException if an encoding size constraint is violated. + * @throws SaslEncodingException if the UTF-8 encoding is not supported on + * this platform. + * @throws IOException if any other I/O exception occurs during the operation. + */ + public void setText(String str) throws IOException + { + byte[] b = str.getBytes("UTF8"); + final int length = b.length; + if (length > Registry.SASL_TWO_BYTE_MAX_LIMIT) + throw new SaslEncodingException("SASL text too long"); + byte[] lengthBytes = { (byte)(length >>> 8), (byte) length }; + out.write(lengthBytes); + out.write(b); + } + + /** + * Returns the encoded form of the current buffer including the 4-byte length + * header. + * + * @throws SaslEncodingException if an encoding size constraint is violated. + */ + public byte[] encode() throws SaslEncodingException + { + byte[] buffer = wrap(); + final int length = buffer.length; + byte[] result = new byte[length + 4]; + result[0] = (byte)(length >>> 24); + result[1] = (byte)(length >>> 16); + result[2] = (byte)(length >>> 8); + result[3] = (byte) length; + System.arraycopy(buffer, 0, result, 4, length); + return result; + } + + /** + * Returns the encoded form of the current buffer excluding the 4-byte length + * header. + * + * @throws SaslEncodingException if an encoding size constraint is violated. + */ + public byte[] wrap() throws SaslEncodingException + { + final int length = out.size(); + if (length > Registry.SASL_BUFFER_MAX_LIMIT || length < 0) + throw new SaslEncodingException("SASL buffer too long"); + return out.toByteArray(); + } +} |