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      1 package org.bouncycastle.crypto.digests;
      2 
      3 import org.bouncycastle.crypto.util.Pack;
      4 
      5 
      6 /**
      7  * FIPS 180-2 implementation of SHA-384.
      8  *
      9  * <pre>
     10  *         block  word  digest
     11  * SHA-1   512    32    160
     12  * SHA-256 512    32    256
     13  * SHA-384 1024   64    384
     14  * SHA-512 1024   64    512
     15  * </pre>
     16  */
     17 public class SHA384Digest
     18     extends LongDigest
     19 {
     20 
     21     private static final int    DIGEST_LENGTH = 48;
     22 
     23     /**
     24      * Standard constructor
     25      */
     26     public SHA384Digest()
     27     {
     28     }
     29 
     30     /**
     31      * Copy constructor.  This will copy the state of the provided
     32      * message digest.
     33      */
     34     public SHA384Digest(SHA384Digest t)
     35     {
     36         super(t);
     37     }
     38 
     39     public String getAlgorithmName()
     40     {
     41         return "SHA-384";
     42     }
     43 
     44     public int getDigestSize()
     45     {
     46         return DIGEST_LENGTH;
     47     }
     48 
     49     public int doFinal(
     50         byte[]  out,
     51         int     outOff)
     52     {
     53         finish();
     54 
     55         Pack.longToBigEndian(H1, out, outOff);
     56         Pack.longToBigEndian(H2, out, outOff + 8);
     57         Pack.longToBigEndian(H3, out, outOff + 16);
     58         Pack.longToBigEndian(H4, out, outOff + 24);
     59         Pack.longToBigEndian(H5, out, outOff + 32);
     60         Pack.longToBigEndian(H6, out, outOff + 40);
     61 
     62         reset();
     63 
     64         return DIGEST_LENGTH;
     65     }
     66 
     67     /**
     68      * reset the chaining variables
     69      */
     70     public void reset()
     71     {
     72         super.reset();
     73 
     74         /* SHA-384 initial hash value
     75          * The first 64 bits of the fractional parts of the square roots
     76          * of the 9th through 16th prime numbers
     77          */
     78         H1 = 0xcbbb9d5dc1059ed8l;
     79         H2 = 0x629a292a367cd507l;
     80         H3 = 0x9159015a3070dd17l;
     81         H4 = 0x152fecd8f70e5939l;
     82         H5 = 0x67332667ffc00b31l;
     83         H6 = 0x8eb44a8768581511l;
     84         H7 = 0xdb0c2e0d64f98fa7l;
     85         H8 = 0x47b5481dbefa4fa4l;
     86     }
     87 }
     88