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Diffstat (limited to 'gcc-4.4.3/libjava/classpath/gnu/java/security/sig/rsa/RSAPKCS1V1_5SignatureRawCodec.java')
| -rw-r--r-- | gcc-4.4.3/libjava/classpath/gnu/java/security/sig/rsa/RSAPKCS1V1_5SignatureRawCodec.java | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/gcc-4.4.3/libjava/classpath/gnu/java/security/sig/rsa/RSAPKCS1V1_5SignatureRawCodec.java b/gcc-4.4.3/libjava/classpath/gnu/java/security/sig/rsa/RSAPKCS1V1_5SignatureRawCodec.java new file mode 100644 index 000000000..68c1edaa6 --- /dev/null +++ b/gcc-4.4.3/libjava/classpath/gnu/java/security/sig/rsa/RSAPKCS1V1_5SignatureRawCodec.java @@ -0,0 +1,153 @@ +/* RSAPKCS1V1_5SignatureRawCodec.java -- Raw RSA PKCS1 v1.5 signature codeec + Copyright (C) 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.java.security.sig.rsa; + +import java.io.ByteArrayOutputStream; + +import gnu.java.security.Registry; +import gnu.java.security.sig.ISignatureCodec; + +/** + * An object that implements the {@link ISignatureCodec} operations for the + * <i>Raw</i> format to use with RSA-PKCS#1 v1.5 signatures. + */ +public class RSAPKCS1V1_5SignatureRawCodec + implements ISignatureCodec +{ + public int getFormatID() + { + return RAW_FORMAT; + } + + /** + * Returns the encoded form of the designated RSA-PKCS#1 (v1.5) signature + * object according to the <i>Raw</i> format supported by this library. + * <p> + * The <i>Raw</i> format for such a signature, in this implementation, is a + * byte sequence consisting of the following: + * <p> + * <ol> + * <li>4-byte magic consisting of the value of the literal + * {@link Registry#MAGIC_RAW_RSA_PKCS1V1_5_SIGNATURE}, + * <li> + * <li>1-byte version consisting of the constant: 0x01,</li> + * <li>4-byte count of following bytes representing the RSA-PKCS#1 (v1.5) + * signature bytes in internet order,</li> + * <li>the RSA-PKCS#1 (v1.5) signature bytes in internet order.</li> + * </ol> + * + * @param signature the signature to encode, consisting of the output of the + * <code>sign()</code> method of a {@link RSAPKCS1V1_5Signature} + * instance --a byte array. + * @return the <i>Raw</i> format encoding of the designated signature. + * @exception IllegalArgumentException if the designated signature is not an + * RSA-PKCS#1 (v1.5) one. + */ + public byte[] encodeSignature(Object signature) + { + byte[] buffer; + try + { + buffer = (byte[]) signature; + } + catch (Exception x) + { + throw new IllegalArgumentException("Signature/codec mismatch"); + } + + ByteArrayOutputStream baos = new ByteArrayOutputStream(); + + // magic + baos.write(Registry.MAGIC_RAW_RSA_PKCS1V1_5_SIGNATURE[0]); + baos.write(Registry.MAGIC_RAW_RSA_PKCS1V1_5_SIGNATURE[1]); + baos.write(Registry.MAGIC_RAW_RSA_PKCS1V1_5_SIGNATURE[2]); + baos.write(Registry.MAGIC_RAW_RSA_PKCS1V1_5_SIGNATURE[3]); + + // version + baos.write(0x01); + + // signature bytes + int length = buffer.length; + baos.write( length >>> 24); + baos.write((length >>> 16) & 0xFF); + baos.write((length >>> 8) & 0xFF); + baos.write( length & 0xFF); + baos.write(buffer, 0, length); + + return baos.toByteArray(); + } + + /** + * Returns the decoded object from a designated input assumed to have been + * generated by the {@link #encodeSignature(Object)} method. + * + * @param input the input bytes of a previously Raw-encoded RSA PKCS1 (v1.5) + * signature. + * @return the signature object. + * @throws IllegalArgumentException if the designated input does not start + * with the right <i>magic</i> characters, or if the <i>version</i> + * is not supported. + */ + public Object decodeSignature(byte[] input) + { + // magic + if (input[0] != Registry.MAGIC_RAW_RSA_PKCS1V1_5_SIGNATURE[0] + || input[1] != Registry.MAGIC_RAW_RSA_PKCS1V1_5_SIGNATURE[1] + || input[2] != Registry.MAGIC_RAW_RSA_PKCS1V1_5_SIGNATURE[2] + || input[3] != Registry.MAGIC_RAW_RSA_PKCS1V1_5_SIGNATURE[3]) + throw new IllegalArgumentException("Signature/codec mismatch"); + + // version + if (input[4] != 0x01) + throw new IllegalArgumentException("Wrong or unsupported format version"); + + int i = 5; + int l; + + // signature bytes + l = input[i++] << 24 + | (input[i++] & 0xFF) << 16 + | (input[i++] & 0xFF) << 8 + | (input[i++] & 0xFF); + byte[] result = new byte[l]; + System.arraycopy(input, i, result, 0, l); + + return result; + } +} |