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Library for sending SMS via sms.ru gateway

There is a newer version: 0.1.3

package ru.dezhik.sms.sender.api.smsru.auth;

/**
 * Taken from commons-codec
 *
 * Converts hexadecimal Strings. The charset used for certain operation can be set, the default is set in
 * {@link #DEFAULT_CHARSET_NAME}
 *
 * This class is thread-safe.
 *
 * @since 1.1
 * @version $Id: Hex.java 1429868 2013-01-07 16:08:05Z ggregory $
 */
public class Hex {
    /**
     * Used to build output as Hex
     */
    private static final char[] DIGITS_LOWER =
            {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};

    /**
     * Converts an array of bytes into an array of characters representing the hexadecimal values of each byte in order.
     * The returned array will be double the length of the passed array, as it takes two characters to represent any
     * given byte.
     *
     * @param data
     *            a byte[] to convert to Hex characters
     * @return A char[] containing hexadecimal characters
     * @since 1.4
     */
    protected static String encodeHex(final byte[] data) {
        final int l = data.length;
        final char[] out = new char[l << 1];
        // two characters form the hex value.
        for (int i = 0, j = 0; i < l; i++) {
            out[j++] = DIGITS_LOWER[(0xF0 & data[i]) >>> 4];
            out[j++] = DIGITS_LOWER[0x0F & data[i]];
        }
        return new String(out);
    }

}