1 files changed, 52 insertions, 0 deletions
diff --git a/crypto/src/pkcs/Pkcs8EncryptedPrivateKeyInfoBuilder.cs b/crypto/src/pkcs/Pkcs8EncryptedPrivateKeyInfoBuilder.cs
new file mode 100644
index 000000000..3b05deea7
--- /dev/null
+++ b/crypto/src/pkcs/Pkcs8EncryptedPrivateKeyInfoBuilder.cs
@@ -0,0 +1,52 @@
+using Org.BouncyCastle.Asn1.Pkcs;
+using Org.BouncyCastle.Asn1.X509;
+using Org.BouncyCastle.Crypto;
+using Org.BouncyCastle.Utilities.IO;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Text;
+
+namespace Org.BouncyCastle.Pkcs
+{
+    public class Pkcs8EncryptedPrivateKeyInfoBuilder
+    {
+        private PrivateKeyInfo privateKeyInfo;
+
+        public Pkcs8EncryptedPrivateKeyInfoBuilder(byte[] privateKeyInfo):  this(PrivateKeyInfo.GetInstance(privateKeyInfo))
+        {
+        }
+
+        public Pkcs8EncryptedPrivateKeyInfoBuilder(PrivateKeyInfo privateKeyInfo)
+        {
+            this.privateKeyInfo = privateKeyInfo;
+        }
+
+        /// <summary>
+        /// Create the encrypted private key info using the passed in encryptor.
+        /// </summary>
+        /// <param name="encryptor">The encryptor to use.</param>
+        /// <returns>An encrypted private key info containing the original private key info.</returns>
+        public Pkcs8EncryptedPrivateKeyInfo Build(
+            ICipherBuilder encryptor)
+        {
+            try
+            {
+                MemoryStream bOut = new MemoryOutputStream();
+                ICipher cOut = encryptor.BuildCipher(bOut);
+                byte[] keyData = privateKeyInfo.GetEncoded();
+
+                using (var str = cOut.Stream)
+                {
+                    str.Write(keyData, 0, keyData.Length);
+                }
+
+                return new Pkcs8EncryptedPrivateKeyInfo(new EncryptedPrivateKeyInfo((AlgorithmIdentifier)encryptor.AlgorithmDetails, bOut.ToArray()));
+            }
+            catch (IOException)
+            {
+                throw new InvalidOperationException("cannot encode privateKeyInfo");
+            }
+        }
+    }
+}