gistfile1.java

public static String generateSHA1Hash(String input) throws Exception {

	MessageDigest messagedigest = MessageDigest.getInstance("SHA");
	messagedigest.update(input.getBytes("UTF-8"));
	byte digest[] = messagedigest.digest();

	StringBuffer s = new StringBuffer(digest.length * 2);
	int length = digest.length;
	for (int n = 0; n < length; n++) {
		int number = digest[n];
		number = (number < 0) ? (number + 256) : number;
		s.append(Integer.toString(number, 16));
	}

	return s.toString();
}