SHA-1 Hash Function

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public String sha1(String s) {
        MessageDigest digest = null;
		try {
			digest = MessageDigest.getInstance("SHA-1");
		} catch (NoSuchAlgorithmException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
        digest.reset();
        byte[] data = digest.digest(s.getBytes());
        return String.format("%0" + (data.length*2) + "X", new BigInteger(1, data));
}