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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/pad/TLS1.java | |
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Diffstat (limited to 'libjava/classpath/gnu/javax/crypto/pad/TLS1.java')
-rw-r--r-- | libjava/classpath/gnu/javax/crypto/pad/TLS1.java | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/javax/crypto/pad/TLS1.java b/libjava/classpath/gnu/javax/crypto/pad/TLS1.java new file mode 100644 index 000000000..1d690dd59 --- /dev/null +++ b/libjava/classpath/gnu/javax/crypto/pad/TLS1.java @@ -0,0 +1,91 @@ +/* TLS1.java -- TLSv1 padding scheme. + 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.pad; + +/** + * The padding scheme used by the Transport Layer Security protocol, version 1. + * This padding scheme is used in the block-ciphered struct, e.g.: + * <pre> + * block-ciphered struct { + * opaque content[TLSCompressed.length]; + * opaque MAC[CipherSpec.hash_size]; + * uint8 padding[GenericBlockCipher.padding_length]; + * uint8 padding_length; + * } GenericBlockCipher; + * </pre> + * <p> + * Where <i>padding_length</i> is any multiple of <i>cipher_block_size</i> - + * ((<i>SSLCompressed.length</i> + <i>CipherSpec.hash_size</i>) % + * <i>cipher_block_size</i>) - 1 that is less than 255. Every byte of the + * padding must be equal to <i>padding_length</i>. That is, the end of the + * plaintext is <i>n</i> + 1 copies of the unsigned byte <i>n</i>. + */ +public class TLS1 + extends BasePad +{ + public TLS1() + { + super("tls1"); + } + + public void setup() + { + if (blockSize <= 0 || blockSize > 255) + throw new IllegalArgumentException("invalid block size: " + blockSize); + } + + public byte[] pad(final byte[] in, final int off, final int len) + { + int padlen = blockSize - (len % blockSize); + byte[] pad = new byte[padlen]; + for (int i = 0; i < padlen; i++) + pad[i] = (byte)(padlen - 1); + return pad; + } + + public int unpad(final byte[] in, final int off, final int len) + throws WrongPaddingException + { + int padlen = in[off + len - 1] & 0xFF; + for (int i = off + (len - padlen - 1); i < off + len - 1; i++) + if ((in[i] & 0xFF) != padlen) + throw new WrongPaddingException(); + return padlen + 1; + } +} |