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diff --git a/pdf-over-gui/src/main/java/at/asit/pdfover/gui/bku/mobile/MobileBKUValidator.java b/pdf-over-gui/src/main/java/at/asit/pdfover/gui/bku/mobile/MobileBKUValidator.java
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+/*
+ * Copyright 2012 by A-SIT, Secure Information Technology Center Austria
+ *
+ * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
+ * the European Commission - subsequent versions of the EUPL (the "Licence");
+ * You may not use this work except in compliance with the Licence.
+ * You may obtain a copy of the Licence at:
+ * http://joinup.ec.europa.eu/software/page/eupl
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the Licence is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the Licence for the specific language governing permissions and
+ * limitations under the Licence.
+ */
+package at.asit.pdfover.gui.bku.mobile;
+
+// Imports
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import at.asit.pdfover.gui.exceptions.InvalidPasswordException;
+import at.asit.pdfover.gui.exceptions.PasswordTooLongException;
+import at.asit.pdfover.gui.exceptions.PasswordTooShortException;
+
+/**
+ *
+ */
+public class MobileBKUValidator {
+
+	/**
+	 * Regular expression for mobile phone numbers: this allows the entry of
+	 * mobile numbers in the following formats:
+	 *
+	 * +(countryCode)99999999999 00(countryCode)99999999999 099999999999
+	 * 1030199999999999 (A-Trust Test bku)
+	 */
+	private static final String NUMBER_REGEX = "^((\\+[\\d]{2})|(00[\\d]{2})|(0)|(10301))([1-9][\\d]+)$";
+
+	/**
+	 * Validates the Mobile phone number
+	 *
+	 * @param number
+	 * @return the normalized Phone number
+	 */
+	public static String normalizeMobileNumber(String number) {
+		// Verify number and normalize
+
+		number = number.trim();
+		
+		String numberWithoutWhitespace = number.replaceAll("\\s","");
+		// Compile and use regular expression
+		Pattern pattern = Pattern.compile(NUMBER_REGEX);
+		Matcher matcher = pattern.matcher(numberWithoutWhitespace);
+
+		if (!matcher.find())
+			return number; /* might be an idA username, return unchanged */
+
+		if (matcher.groupCount() != 6) {
+			return number;
+		}
+
+		String countryCode = matcher.group(1);
+
+		String normalNumber = matcher.group(6);
+
+		if (countryCode.equals("10301")) {
+			// A-Trust Testnumber! Don't change
+			return numberWithoutWhitespace;
+		}
+
+		countryCode = countryCode.replace("00", "+");
+
+		if (countryCode.equals("0")) {
+			countryCode = "+43";
+		}
+
+		return countryCode + normalNumber;
+	}
+
+	/**
+	 * Validate given Password for Mobile BKU
+	 *
+	 * @param password
+	 * @throws InvalidPasswordException
+	 */
+	public static void validatePassword(String password)
+			throws InvalidPasswordException {
+		if (password.length() < 5)
+			throw new PasswordTooShortException();
+		if (password.length() > 200)
+			throw new PasswordTooLongException();
+	}
+}