Initial Commit

iTechSharp/srcbc/crypto/PbeParametersGenerator.cs

@@ -0,0 +1,169 @@
+using System;
+using System.Text;
+
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Crypto
+{
+	/**
+	 * super class for all Password Based Encyrption (Pbe) parameter generator classes.
+	 */
+	public abstract class PbeParametersGenerator
+	{
+		protected byte[]	mPassword;
+		protected byte[]	mSalt;
+		protected int		mIterationCount;
+
+		/**
+		 * base constructor.
+		 */
+		protected PbeParametersGenerator()
+		{
+		}
+
+		/**
+		 * initialise the Pbe generator.
+		 *
+		 * @param password the password converted into bytes (see below).
+		 * @param salt the salt to be mixed with the password.
+		 * @param iterationCount the number of iterations the "mixing" function
+		 * is to be applied for.
+		 */
+		public virtual void Init(
+			byte[]  password,
+			byte[]  salt,
+			int     iterationCount)
+		{
+			if (password == null)
+				throw new ArgumentNullException("password");
+			if (salt == null)
+				throw new ArgumentNullException("salt");
+
+			this.mPassword = Arrays.Clone(password);
+			this.mSalt = Arrays.Clone(salt);
+			this.mIterationCount = iterationCount;
+		}
+
+		public virtual byte[] Password
+		{
+			get { return Arrays.Clone(mPassword); }
+		}
+
+		/**
+		 * return the password byte array.
+		 *
+		 * @return the password byte array.
+		 */
+		[Obsolete("Use 'Password' property")]
+		public byte[] GetPassword()
+		{
+			return Password;
+		}
+
+		public virtual byte[] Salt
+		{
+			get { return Arrays.Clone(mSalt); }
+		}
+
+		/**
+		 * return the salt byte array.
+		 *
+		 * @return the salt byte array.
+		 */
+		[Obsolete("Use 'Salt' property")]
+		public byte[] GetSalt()
+		{
+			return Salt;
+		}
+
+		/**
+		 * return the iteration count.
+		 *
+		 * @return the iteration count.
+		 */
+		public virtual int IterationCount
+		{
+			get { return mIterationCount; }
+		}
+
+		/**
+		 * Generate derived parameters for a key of length keySize.
+		 *
+		 * @param keySize the length, in bits, of the key required.
+		 * @return a parameters object representing a key.
+		 */
+		[Obsolete("Use version with 'algorithm' parameter")]
+		public abstract ICipherParameters GenerateDerivedParameters(int keySize);
+		public abstract ICipherParameters GenerateDerivedParameters(string algorithm, int keySize);
+
+		/**
+		 * Generate derived parameters for a key of length keySize, and
+		 * an initialisation vector (IV) of length ivSize.
+		 *
+		 * @param keySize the length, in bits, of the key required.
+		 * @param ivSize the length, in bits, of the iv required.
+		 * @return a parameters object representing a key and an IV.
+		 */
+		[Obsolete("Use version with 'algorithm' parameter")]
+		public abstract ICipherParameters GenerateDerivedParameters(int keySize, int ivSize);
+		public abstract ICipherParameters GenerateDerivedParameters(string algorithm, int keySize, int ivSize);
+
+		/**
+		 * Generate derived parameters for a key of length keySize, specifically
+		 * for use with a MAC.
+		 *
+		 * @param keySize the length, in bits, of the key required.
+		 * @return a parameters object representing a key.
+		 */
+		public abstract ICipherParameters GenerateDerivedMacParameters(int keySize);
+
+		/**
+		 * converts a password to a byte array according to the scheme in
+		 * Pkcs5 (ascii, no padding)
+		 *
+		 * @param password a character array reqpresenting the password.
+		 * @return a byte array representing the password.
+		 */
+		public static byte[] Pkcs5PasswordToBytes(
+			char[] password)
+		{
+			return Encoding.ASCII.GetBytes(password);
+		}
+
+		public static byte[] Pkcs5PasswordToBytes(
+			string password)
+		{
+			return Encoding.ASCII.GetBytes(password);
+		}
+
+		/**
+		 * converts a password to a byte array according to the scheme in
+		 * Pkcs12 (unicode, big endian, 2 zero pad bytes at the end).
+		 *
+		 * @param password a character array representing the password.
+		 * @return a byte array representing the password.
+		 */
+		public static byte[] Pkcs12PasswordToBytes(
+			char[] password)
+		{
+			return Pkcs12PasswordToBytes(password, false);
+		}
+
+		public static byte[] Pkcs12PasswordToBytes(
+			char[]	password,
+			bool	wrongPkcs12Zero)
+		{
+			if (password.Length < 1)
+			{
+				return new byte[wrongPkcs12Zero ? 2 : 0];
+			}
+
+			// +1 for extra 2 pad bytes.
+			byte[] bytes = new byte[(password.Length + 1) * 2];
+
+			Encoding.BigEndianUnicode.GetBytes(password, 0, password.Length, bytes, 0);
+
+			return bytes;
+		}
+	}
+}