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The FIPS 140-3 Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms certified to FIPS 140-3 level 1. This jar contains JCE provider and low-level API for the BC-FJA version 2.0.0, FIPS Certificate #4743. Please see certificate for certified platform details.
package org.bouncycastle.crypto.internal.params;
public class DesEdeParameters
{
/*
* DES-EDE Key length in bytes.
*/
static public final int DES_EDE_KEY_LENGTH = 24;
/**
* return true if the passed in key is a DES-EDE weak key.
*
* @param key bytes making up the key
* @param offset offset into the byte array the key starts at
* @param length number of bytes making up the key
*/
public static boolean isWeakKey(
byte[] key,
int offset,
int length)
{
for (int i = offset; i < length; i += DesParameters.DES_KEY_LENGTH)
{
if (DesParameters.isWeakKey(key, i))
{
return true;
}
}
return false;
}
public static boolean isRealEDEKey(byte[] key)
{
return key.length == 16 ? isReal2Key(key) : isReal3Key(key);
}
public static boolean isReal2Key(byte[] key)
{
boolean isValid = false;
for (int i = 0; i != 8; i++)
{
if (key[i] != key[i + 8])
{
isValid = true;
}
}
return isValid;
}
public static boolean isReal3Key(byte[] key)
{
boolean diff12 = false, diff13 = false, diff23 = false;
for (int i = 0; i != 8; i++)
{
diff12 |= (key[i] != key[i + 8]);
diff13 |= (key[i] != key[i + 16]);
diff23 |= (key[i + 8] != key[i + 16]);
}
return diff12 && diff13 && diff23;
}
public static boolean isActuallyDesKey(byte[] key)
{
boolean isDesKey = true;
if (key.length == 16)
{
for (int i = 0; i != 8; i++)
{
if (key[i] != key[i + 8])
{
isDesKey = false;
}
}
}
else
{
for (int i = 0; i != 8; i++)
{
if (key[i] != key[i + 8] || key[i + 8] != key[i + 16])
{
isDesKey = false;
}
}
}
return isDesKey;
}
}