1 files changed, 123 insertions, 0 deletions
diff --git a/crypto/test/src/openpgp/examples/PgpExampleUtilities.cs b/crypto/test/src/openpgp/examples/PgpExampleUtilities.cs
new file mode 100644
index 000000000..fd371d7af
--- /dev/null
+++ b/crypto/test/src/openpgp/examples/PgpExampleUtilities.cs
@@ -0,0 +1,123 @@
+using System;
+using System.IO;
+
+namespace Org.BouncyCastle.Bcpg.OpenPgp.Examples
+{
+	internal class PgpExampleUtilities
+	{
+		internal static byte[] CompressFile(string fileName, CompressionAlgorithmTag algorithm)
+		{
+			MemoryStream bOut = new MemoryStream();
+			PgpCompressedDataGenerator comData = new PgpCompressedDataGenerator(algorithm);
+			PgpUtilities.WriteFileToLiteralData(comData.Open(bOut), PgpLiteralData.Binary,
+				new FileInfo(fileName));
+			comData.Close();
+			return bOut.ToArray();
+		}
+
+		/**
+		 * Search a secret key ring collection for a secret key corresponding to keyID if it
+		 * exists.
+		 * 
+		 * @param pgpSec a secret key ring collection.
+		 * @param keyID keyID we want.
+		 * @param pass passphrase to decrypt secret key with.
+		 * @return
+		 * @throws PGPException
+		 * @throws NoSuchProviderException
+		 */
+		internal static PgpPrivateKey FindSecretKey(PgpSecretKeyRingBundle pgpSec, long keyID, char[] pass)
+		{
+			PgpSecretKey pgpSecKey = pgpSec.GetSecretKey(keyID);
+
+			if (pgpSecKey == null)
+			{
+				return null;
+			}
+
+			return pgpSecKey.ExtractPrivateKey(pass);
+		}
+
+		internal static PgpPublicKey ReadPublicKey(string fileName)
+		{
+			using (Stream keyIn = File.OpenRead(fileName))
+			{
+				return ReadPublicKey(keyIn);
+			}
+		}
+
+		/**
+		 * A simple routine that opens a key ring file and loads the first available key
+		 * suitable for encryption.
+		 * 
+		 * @param input
+		 * @return
+		 * @throws IOException
+		 * @throws PGPException
+		 */
+		internal static PgpPublicKey ReadPublicKey(Stream input)
+		{
+			PgpPublicKeyRingBundle pgpPub = new PgpPublicKeyRingBundle(
+				PgpUtilities.GetDecoderStream(input));
+
+			//
+			// we just loop through the collection till we find a key suitable for encryption, in the real
+			// world you would probably want to be a bit smarter about this.
+			//
+
+			foreach (PgpPublicKeyRing keyRing in pgpPub.GetKeyRings())
+			{
+				foreach (PgpPublicKey key in keyRing.GetPublicKeys())
+				{
+					if (key.IsEncryptionKey)
+					{
+						return key;
+					}
+				}
+			}
+
+			throw new ArgumentException("Can't find encryption key in key ring.");
+		}
+
+		internal static PgpSecretKey ReadSecretKey(string fileName)
+		{
+			using (Stream keyIn = File.OpenRead(fileName))
+			{
+				return ReadSecretKey(keyIn);
+			}
+		}
+
+		/**
+		 * A simple routine that opens a key ring file and loads the first available key
+		 * suitable for signature generation.
+		 * 
+		 * @param input stream to read the secret key ring collection from.
+		 * @return a secret key.
+		 * @throws IOException on a problem with using the input stream.
+		 * @throws PGPException if there is an issue parsing the input stream.
+		 */
+		internal static PgpSecretKey ReadSecretKey(Stream input)
+		{
+			PgpSecretKeyRingBundle pgpSec = new PgpSecretKeyRingBundle(
+				PgpUtilities.GetDecoderStream(input));
+
+			//
+			// we just loop through the collection till we find a key suitable for encryption, in the real
+			// world you would probably want to be a bit smarter about this.
+			//
+
+			foreach (PgpSecretKeyRing keyRing in pgpSec.GetKeyRings())
+			{
+				foreach (PgpSecretKey key in keyRing.GetSecretKeys())
+				{
+					if (key.IsSigningKey)
+					{
+						return key;
+					}
+				}
+			}
+
+			throw new ArgumentException("Can't find signing key in key ring.");
+		}
+	}
+}