Initial Commit

iTechSharp/srcbc/pkcs/EncryptedPrivateKeyInfoFactory.cs

@@ -0,0 +1,75 @@
+using System;
+
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Asn1.Pkcs;
+using Org.BouncyCastle.Asn1.X509;
+using Org.BouncyCastle.Crypto;
+using Org.BouncyCastle.Security;
+
+namespace Org.BouncyCastle.Pkcs
+{
+    public sealed class EncryptedPrivateKeyInfoFactory
+    {
+        private EncryptedPrivateKeyInfoFactory()
+        {
+        }
+
+        public static EncryptedPrivateKeyInfo CreateEncryptedPrivateKeyInfo(
+            DerObjectIdentifier		algorithm,
+            char[]					passPhrase,
+            byte[]					salt,
+            int						iterationCount,
+            AsymmetricKeyParameter	key)
+        {
+            return CreateEncryptedPrivateKeyInfo(
+				algorithm.Id, passPhrase, salt, iterationCount,
+				PrivateKeyInfoFactory.CreatePrivateKeyInfo(key));
+        }
+
+		public static EncryptedPrivateKeyInfo CreateEncryptedPrivateKeyInfo(
+			string					algorithm,
+			char[]					passPhrase,
+			byte[]					salt,
+			int						iterationCount,
+			AsymmetricKeyParameter	key)
+		{
+			return CreateEncryptedPrivateKeyInfo(
+				algorithm, passPhrase, salt, iterationCount,
+				PrivateKeyInfoFactory.CreatePrivateKeyInfo(key));
+		}
+
+		public static EncryptedPrivateKeyInfo CreateEncryptedPrivateKeyInfo(
+            string			algorithm,
+            char[]			passPhrase,
+            byte[]			salt,
+            int				iterationCount,
+            PrivateKeyInfo	keyInfo)
+        {
+            if (!PbeUtilities.IsPbeAlgorithm(algorithm))
+                throw new ArgumentException("attempt to use non-Pbe algorithm with Pbe EncryptedPrivateKeyInfo generation");
+
+			IBufferedCipher cipher = PbeUtilities.CreateEngine(algorithm) as IBufferedCipher;
+
+			if (cipher == null)
+			{
+				// TODO Throw exception?
+			}
+
+			Asn1Encodable parameters = PbeUtilities.GenerateAlgorithmParameters(
+				algorithm, salt, iterationCount);
+
+			ICipherParameters keyParameters = PbeUtilities.GenerateCipherParameters(
+				algorithm, passPhrase, parameters);
+
+			cipher.Init(true, keyParameters);
+
+			byte[] keyBytes = keyInfo.GetEncoded();
+			byte[] encoding = cipher.DoFinal(keyBytes);
+
+			DerObjectIdentifier oid = PbeUtilities.GetObjectIdentifier(algorithm);
+			AlgorithmIdentifier algID = new AlgorithmIdentifier(oid, parameters);
+
+			return new EncryptedPrivateKeyInfo(algID, encoding);
+        }
+    }
+}