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using System;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Security;
namespace Org.BouncyCastle.Crypto.Parameters
{
/**
* Parameters for NaccacheStern public private key generation. For details on
* this cipher, please see
*
* http://www.gemplus.com/smart/rd/publications/pdf/NS98pkcs.pdf
*/
public class NaccacheSternKeyGenerationParameters : KeyGenerationParameters
{
// private BigInteger publicExponent;
private readonly int certainty;
private readonly int countSmallPrimes;
private bool debug;
/**
* Parameters for generating a NaccacheStern KeyPair.
*
* @param random
* The source of randomness
* @param strength
* The desired strength of the Key in Bits
* @param certainty
* the probability that the generated primes are not really prime
* as integer: 2^(-certainty) is then the probability
* @param countSmallPrimes
* How many small key factors are desired
*/
public NaccacheSternKeyGenerationParameters(
SecureRandom random,
int strength,
int certainty,
int countSmallPrimes)
: this(random, strength, certainty, countSmallPrimes, false)
{
}
/**
* Parameters for a NaccacheStern KeyPair.
*
* @param random
* The source of randomness
* @param strength
* The desired strength of the Key in Bits
* @param certainty
* the probability that the generated primes are not really prime
* as integer: 2^(-certainty) is then the probability
* @param cntSmallPrimes
* How many small key factors are desired
* @param debug
* Turn debugging on or off (reveals secret information, use with
* caution)
*/
public NaccacheSternKeyGenerationParameters(SecureRandom random,
int strength,
int certainty,
int countSmallPrimes,
bool debug)
: base(random, strength)
{
if (countSmallPrimes % 2 == 1)
{
throw new ArgumentException("countSmallPrimes must be a multiple of 2");
}
if (countSmallPrimes < 30)
{
throw new ArgumentException("countSmallPrimes must be >= 30 for security reasons");
}
this.certainty = certainty;
this.countSmallPrimes = countSmallPrimes;
this.debug = debug;
}
/**
* @return Returns the certainty.
*/
public int Certainty
{
get { return certainty; }
}
/**
* @return Returns the countSmallPrimes.
*/
public int CountSmallPrimes
{
get { return countSmallPrimes; }
}
public bool IsDebug
{
get { return debug; }
}
}
}
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