系统中加密算法EncryptUtil03

private static String byte2hex(byte[] arrB)
    {
        int iLen = arrB.length;

        // 每个byte用两个字符才能表示,所以字符串的长度是数组长度的两倍
        StringBuffer sb = new StringBuffer(iLen * 2);
        for (int i = 0; i < iLen; i++)
        {
            int intTmp = arrB[i];

            // 把负数转换为正数
            while (intTmp < 0)
            {
                intTmp = intTmp + 256;
            }

            // 小于0F的数需要在前面补0
            if (intTmp < 16)
            {
                sb.append("0");
            }
            sb.append(Integer.toString(intTmp, 16));
        }
        return sb.toString();
    }

    private static byte[] hex2byte(String strIn)
    {
        byte[] arrB = strIn.getBytes();
        int iLen = arrB.length;

        // 两个字符表示一个字节,所以字节数组长度是字符串长度除以2
        byte[] arrOut = new byte[iLen / 2];
        for (int i = 0; i < iLen; i = i + 2)
        {
            String strTmp = new String(arrB, i, 2);
            arrOut[i / 2] = (byte) Integer.parseInt(strTmp, 16);
        }
        return arrOut;
    }

    private static Key getKey()
    {
        byte[] arrBTmp = defaultKeyStr.getBytes();
        // String keyStr = FileManager.getESBProperty("Encrypt_Key");
        // if ((keyStr != null) && (!"".equals(keyStr)))
        // {
        // arrBTmp = keyStr.getBytes();
        // }

        // 创建一个空的8位字节数组(默认值为0)
        byte[] arrB = new byte[8];

        // 将原始字节数组转换为8位
        for (int i = 0; i < arrBTmp.length && i < arrB.length; i++)
        {
            arrB[i] = arrBTmp[i];
        }

        // 生成密钥
        Key key = new javax.crypto.spec.SecretKeySpec(arrB, "DES");
        return key;
    }

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转载自xieguowei123485.iteye.com/blog/1431978