1 package org.bouncycastle.crypto.params; 2 3 public class DESedeParameters 4 extends DESParameters 5 { 6 /* 7 * DES-EDE Key length in bytes. 8 */ 9 static public final int DES_EDE_KEY_LENGTH = 24; 10 11 public DESedeParameters( 12 byte[] key) 13 { 14 super(key); 15 16 if (isWeakKey(key, 0, 0)) 17 { 18 throw new IllegalArgumentException("attempt to create weak DESede key"); 19 } 20 } 21 22 /** 23 * return true if the passed in key is a DES-EDE weak key. 24 * 25 * @param key bytes making up the key 26 * @param offset offset into the byte array the key starts at 27 * @param length number of bytes making up the key 28 */ 29 public static boolean isWeakKey( 30 byte[] key, 31 int offset, 32 int length) 33 { 34 for (int i = offset; i < length; i += DES_KEY_LENGTH) 35 { 36 if (DESParameters.isWeakKey(key, i)) 37 { 38 return true; 39 } 40 } 41 42 return false; 43 } 44 45 /** 46 * return true if the passed in key is a DES-EDE weak key. 47 * 48 * @param key bytes making up the key 49 * @param offset offset into the byte array the key starts at 50 */ 51 public static boolean isWeakKey( 52 byte[] key, 53 int offset) 54 { 55 return isWeakKey(key, offset, key.length - offset); 56 } 57 } 58
