Initial Commit

iTechSharp/srcbc/crypto/parameters/NaccacheSternKeyGenerationParameters.cs

@@ -0,0 +1,101 @@
+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; }
+		}
+	}
+}