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      1 /*
      2  *  Licensed to the Apache Software Foundation (ASF) under one or more
      3  *  contributor license agreements.  See the NOTICE file distributed with
      4  *  this work for additional information regarding copyright ownership.
      5  *  The ASF licenses this file to You under the Apache License, Version 2.0
      6  *  (the "License"); you may not use this file except in compliance with
      7  *  the License.  You may obtain a copy of the License at
      8  *
      9  *     http://www.apache.org/licenses/LICENSE-2.0
     10  *
     11  *  Unless required by applicable law or agreed to in writing, software
     12  *  distributed under the License is distributed on an "AS IS" BASIS,
     13  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14  *  See the License for the specific language governing permissions and
     15  *  limitations under the License.
     16  */
     17 /**
     18 * @author Yuri A. Kropachev
     19 * @version $Revision$
     20 */
     21 
     22 
     23 package org.apache.harmony.security.provider.crypto;
     24 
     25 
     26 /**
     27  * This interface contains : <BR>
     28  * - a set of constant values, H0-H4, defined in "SECURE HASH STANDARD", FIPS PUB 180-2 ;<BR>
     29  * - implementation constant values to use in classes using SHA-1 algorithm.    <BR>
     30  */
     31 public final class SHA1Constants {
     32     private SHA1Constants() {
     33     }
     34 
     35     /**
     36      *  constant defined in "SECURE HASH STANDARD"
     37      */
     38     public static final int H0 = 0x67452301;
     39 
     40 
     41     /**
     42      *  constant defined in "SECURE HASH STANDARD"
     43      */
     44     public static final int H1 = 0xEFCDAB89;
     45 
     46 
     47     /**
     48      *  constant defined in "SECURE HASH STANDARD"
     49      */
     50     public static final int H2 = 0x98BADCFE;
     51 
     52 
     53     /**
     54      *  constant defined in "SECURE HASH STANDARD"
     55      */
     56     public static final int H3 = 0x10325476;
     57 
     58 
     59     /**
     60      *  constant defined in "SECURE HASH STANDARD"
     61      */
     62     public static final int H4 = 0xC3D2E1F0;
     63 
     64 
     65     /**
     66      * offset in buffer to store number of bytes in 0-15 word frame
     67      */
     68     public static final int BYTES_OFFSET = 81;
     69 
     70 
     71     /**
     72      * offset in buffer to store current hash value
     73      */
     74     public static final int HASH_OFFSET = 82;
     75 
     76 
     77     /**
     78      * # of bytes in H0-H4 words; <BR>
     79      * in this implementation # is set to 20 (in general # varies from 1 to 20)
     80      */
     81     public static final int DIGEST_LENGTH = 20;
     82 }
     83