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1 package com.daffodilwoods.daffodildb.server.datasystem.encryptdecrypt;
2
3
4 public class EDCbcBlockCipher extends EDBlockCipher
5 {
6
7 private EDBlockCipher blockEDDes3Cipher;
8 private byte iVector[];
9 private byte tempArray[];
10
11 public EDCbcBlockCipher(EDBlockCipher blockcipher)
12 {
13 super(blockcipher.getKeySize(), blockcipher.getBlockSize());
14 blockEDDes3Cipher = blockcipher;
15 iVector = new byte[getBlockSize()];
16 EDUtils.zeroBlock(iVector);
17 tempArray = new byte[getBlockSize()];
18 }
19
20 public void setKey(byte bytes[])
21 {
22 blockEDDes3Cipher.setKey(bytes);
23 }
24
25 public void setIVector(byte bytes0[])
26 {
27 EDUtils.generateCopyBlock(bytes0, iVector);
28 }
29
30 public byte[] setRandomIVector()
31 {
32 byte bytes0[] = new byte[getBlockSize()];
33 EDUtils.generateRandomBlock(bytes0);
34 setIVector(bytes0);
35 return bytes0;
36 }
37
38 public void encryptBytes(byte bytes0[], int i, byte bytes1[], int j)
39 {
40 EDUtils.generateXorBlock(bytes0, i, iVector, 0, tempArray, 0, getBlockSize());
41 blockEDDes3Cipher.encryptBytes(tempArray, 0, bytes1, j);
42 EDUtils.generateCopyBlock(bytes1, j, iVector, 0, getBlockSize());
43 }
44
45 public void decryptBytes(byte bytes0[], int i, byte bytes1[], int j)
46 {
47 blockEDDes3Cipher.decryptBytes(bytes0, i, tempArray, 0);
48 EDUtils.generateXorBlock(tempArray, 0, iVector, 0, bytes1, j, getBlockSize());
49 EDUtils.generateCopyBlock(bytes0, i, iVector, 0, getBlockSize());
50 }
51 }
52 |
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