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Java client library for SecurionPay API

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package com.securionpay.util;

public class Base64 {
	public static String encode(byte[] data) {
		char[] tbl = {
				'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
				'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
				'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
				'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'};

		StringBuilder buffer = new StringBuilder();
		int pad = 0;
		for (int i = 0; i < data.length; i += 3) {

			int b = ((data[i] & 0xFF) << 16) & 0xFFFFFF;
			if (i + 1 < data.length) {
				b |= (data[i + 1] & 0xFF) << 8;
			} else {
				pad++;
			}
			if (i + 2 < data.length) {
				b |= (data[i + 2] & 0xFF);
			} else {
				pad++;
			}

			for (int j = 0; j < 4 - pad; j++) {
				int c = (b & 0xFC0000) >> 18;
				buffer.append(tbl[c]);
				b <<= 6;
			}
		}
		for (int j = 0; j < pad; j++) {
			buffer.append("=");
		}

		return buffer.toString();
	}
}