1 files changed, 59 insertions, 1 deletions

diff --git a/src/main/java/org/openslx/satellitedaemon/Globals.java b/src/main/java/org/openslx/satellitedaemon/Globals.java
index 00d1e0a..2bb9f68 100644
--- a/src/main/java/org/openslx/satellitedaemon/Globals.java
+++ b/src/main/java/org/openslx/satellitedaemon/Globals.java
@@ -1,16 +1,23 @@
 package org.openslx.satellitedaemon;
 
+import java.io.BufferedReader;
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
+import java.io.FileReader;
 import java.io.IOException;
-import java.io.InputStream;
 import java.io.InputStreamReader;
+import java.math.BigInteger;
 import java.nio.charset.StandardCharsets;
+import java.security.KeyFactory;
 import java.security.KeyManagementException;
 import java.security.KeyStore;
 import java.security.KeyStoreException;
 import java.security.NoSuchAlgorithmException;
+import java.security.PrivateKey;
 import java.security.cert.CertificateException;
+import java.security.spec.InvalidKeySpecException;
+import java.security.spec.RSAPrivateKeySpec;
+import java.security.spec.RSAPublicKeySpec;
 import java.util.Properties;
 
 import javax.net.ssl.SSLContext;
@@ -23,6 +30,7 @@ public class Globals {
 	private static Logger log = Logger.getLogger(Globals.class);
 	private static final Properties properties = new Properties();
 	private static SSLContext context = null;
+	private static final KeyFactory keyFact;
 
 	public static final int BLOCKSIZE = 16 * 1024 * 1024; // 16 MB blocksize
 
@@ -94,6 +102,14 @@ public class Globals {
 			System.exit(2);
 		}
 		
+		KeyFactory kf;
+		try {
+			kf = KeyFactory.getInstance("RSA");
+		} catch (NoSuchAlgorithmException nSAE) {
+			kf = null;
+		}
+		keyFact = kf;
+		
 		notNullOrEmptyFatal(getMasterserverHost(), "Masterserver Host must not be empty!");
 		// TODO: check properties
 	}
@@ -165,4 +181,46 @@ public class Globals {
 			System.exit(2);
 		}
 	}
+	
+	public static PrivateKey getPrivateKey() {
+		PrivateKey ret;
+		BufferedReader br = null;
+		String modulus, exponent;
+		try {
+			br = new BufferedReader(new FileReader("config/private.key"));
+			modulus = br.readLine();
+			exponent = br.readLine();
+		} catch (FileNotFoundException e) {
+			log.error("File 'private.key' not found!", e);
+			return null;
+		} catch (IOException e) {
+			log.error("File 'private.key' not correct readable.", e);
+			return null;
+		} finally {
+			try {
+				br.close();
+			} catch (IOException e) {
+			}
+		}
+		if (modulus == null || exponent == null) {
+			return null;
+		}
+		
+		try {
+			BigInteger mod = new BigInteger(modulus);
+			BigInteger exp = new BigInteger(exponent);
+			
+			RSAPrivateKeySpec keySpec = new RSAPrivateKeySpec(mod, exp);
+			synchronized (keyFact) {
+				ret = keyFact.generatePrivate(keySpec);
+			}
+		} catch (InvalidKeySpecException e) {
+			log.error("Not able to build key with given numbers.", e);
+			return null;
+		} catch (NumberFormatException e) {
+			log.error("Invalid number format.", e);
+			return null;
+		}
+		return ret;
+	}
 }
\ No newline at end of file