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Diffstat (limited to 'gcc-4.4.3/libjava/classpath/gnu/java/security/sig/rsa/RSAPKCS1V1_5SignatureX509Codec.java')
-rw-r--r-- | gcc-4.4.3/libjava/classpath/gnu/java/security/sig/rsa/RSAPKCS1V1_5SignatureX509Codec.java | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/gcc-4.4.3/libjava/classpath/gnu/java/security/sig/rsa/RSAPKCS1V1_5SignatureX509Codec.java b/gcc-4.4.3/libjava/classpath/gnu/java/security/sig/rsa/RSAPKCS1V1_5SignatureX509Codec.java new file mode 100644 index 000000000..3cb375602 --- /dev/null +++ b/gcc-4.4.3/libjava/classpath/gnu/java/security/sig/rsa/RSAPKCS1V1_5SignatureX509Codec.java @@ -0,0 +1,128 @@ +/* RSAPSSSignatureX509Codec.java -- X.509 encoder/decoder for RSA signatures + 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 gnu.java.security.Registry; +import gnu.java.security.sig.ISignatureCodec; + +import java.security.InvalidParameterException; + +/** + * An implementation of an {@link ISignatureCodec} that knows to encode and + * decode RSA PKCS1 (v1.5) signatures into the raw bytes which would constitute + * a DER-encoded form of the ASN.1 structure defined in RFC-2459, and RFC-2313 + * as described in the next paragraphs. + * <p> + * Digital signatures when transmitted in an X.509 certificates are encoded + * in DER (Distinguished Encoding Rules) as a BIT STRING; i.e. + * + * <pre> + * Certificate ::= SEQUENCE { + * tbsCertificate TBSCertificate, + * signatureAlgorithm AlgorithmIdentifier, + * signature BIT STRING + * } + * </pre> + * <p> + * The output of the encoder, and the input of the decoder, of this codec are + * then the <i>raw</i> bytes of such a BIT STRING; i.e. not the DER-encoded + * form itself. + * <p> + * Our implementation of the RSA PKCS1 signature algorithm outputs a byte array + * as the result of generating a digital signature, in accordance with RFC-2313. + * As a consequence, the encoder and decoder of this codec, simply pass through + * such a byte array. + * <p> + * Client code that needs to build a DER BIT STRING <b>MUST</b> construct such + * an ASN.1 value. The following is an example of how to do this: + * <p> + * <pre> + * ... + * import gnu.java.security.der.BitString; + * import gnu.java.security.der.DER; + * import gnu.java.security.der.DERValue; + * ... + * DERValue bitString = new DERValue(DER.BIT_STRING, new BitString(sigBytes)); + * ... + * </pre> + */ +public class RSAPKCS1V1_5SignatureX509Codec + implements ISignatureCodec +{ + // default 0-arguments constructor + + public int getFormatID() + { + return Registry.X509_ENCODING_ID; + } + + /** + * Encodes an RSA Signature output as a <i>signature</i> BIT STRING as + * defined in the documentation of this class. + * + * @param signature the output of the RSA PKCS1 (v1.5) signature algorithm; + * i.e. the value returned by the invocation of + * {@link gnu.java.security.sig.ISignature#sign()} method. In the + * case of the RSA PKCS1 (v1.5) signature this is an array of bytes. + * @return the raw bytes of an RSA signature which could be then used as the + * contents of a BIT STRING as per rfc-2459. + */ + public byte[] encodeSignature(Object signature) + { + byte[] result = (byte[]) signature; + return result; + } + + /** + * Decodes a <i>signature</i> as defined in the documentation of this class. + * + * @param input the byte array to unmarshall into a valid RSA PKCS1 (v1.5) + * signature instance; i.e. a byte array. MUST NOT be null. + * @return an array of raw bytes decoded from the designated input. In the + * case of RSA PKCS1 (v1.5) this is the same as the input. + * @throw InvalidParameterException if the <code>input</code> array is null. + */ + public Object decodeSignature(byte[] input) + { + if (input == null) + throw new InvalidParameterException("Input bytes MUST NOT be null"); + + return input; + } +} |