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using System;
using Org.BouncyCastle.Crypto.Parameters;
namespace Org.BouncyCastle.Crypto.Generators
{
public class DesEdeKeyGenerator
: DesKeyGenerator
{
public DesEdeKeyGenerator()
{
}
internal DesEdeKeyGenerator(
int defaultStrength)
: base(defaultStrength)
{
}
/**
* initialise the key generator - if strength is set to zero
* the key Generated will be 192 bits in size, otherwise
* strength can be 128 or 192 (or 112 or 168 if you don't count
* parity bits), depending on whether you wish to do 2-key or 3-key
* triple DES.
*
* @param param the parameters to be used for key generation
*/
protected override void engineInit(
KeyGenerationParameters parameters)
{
this.random = parameters.Random;
this.strength = (parameters.Strength + 7) / 8;
if (strength == 0 || strength == (168 / 8))
{
strength = DesEdeParameters.DesEdeKeyLength;
}
else if (strength == (112 / 8))
{
strength = 2 * DesEdeParameters.DesKeyLength;
}
else if (strength != DesEdeParameters.DesEdeKeyLength
&& strength != (2 * DesEdeParameters.DesKeyLength))
{
throw new ArgumentException("DESede key must be "
+ (DesEdeParameters.DesEdeKeyLength * 8) + " or "
+ (2 * 8 * DesEdeParameters.DesKeyLength)
+ " bits long.");
}
}
protected override byte[] engineGenerateKey()
{
byte[] newKey;
do
{
newKey = random.GenerateSeed(strength);
DesEdeParameters.SetOddParity(newKey);
}
while (DesEdeParameters.IsWeakKey(newKey, 0, newKey.Length));
return newKey;
}
}
}
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