deroutputstream.java

来自「This is a resource based on j2me embedde」· Java 代码 · 共 525 行 · 第 1/2 页

     * @param octets the octet string
     */
    public void putOctetString(byte[] octets) throws IOException {
        write(DerValue.tag_OctetString, octets);
    }

    /**
     * Marshals a DER "null" value on the output stream.  These are
     * often used to indicate optional values which have been omitted.
     */
    public void putNull() throws IOException {
        write(DerValue.tag_Null);
        putLength(0);
    }

    /**
     * Marshals an object identifier (OID) on the output stream.
     * Corresponds to the ASN.1 "OBJECT IDENTIFIER" construct.
     */
    public void putOID(ObjectIdentifier oid) throws IOException {
        oid.encode(this);
    }

    /**
     * Marshals a sequence on the output stream.  This supports both
     * the ASN.1 "SEQUENCE" (zero to N values) and "SEQUENCE OF"
     * (one to N values) constructs.
     */
    public void putSequence(DerValue[] seq) throws IOException {
        DerOutputStream bytes = new DerOutputStream();
        int i;

        for (i = 0; i < seq.length; i++)
            seq[i].encode(bytes);

        write(DerValue.tag_Sequence, bytes);
    }

    /**
     * Marshals the contents of a set on the output stream without
     * ordering the elements.  Ok for BER encoding, but not for DER
     * encoding.
     *
     * For DER encoding, use orderedPutSet() or orderedPutSetOf().
     */
    public void putSet(DerValue[] set) throws IOException {
        DerOutputStream bytes = new DerOutputStream();
        int i;

        for (i = 0; i < set.length; i++)
            set[i].encode(bytes);

        write(DerValue.tag_Set, bytes);
    }

    /**
     * Marshals a string as a DER encoded UTF8String.
     */
    public void putUTF8String(String s) throws IOException {
        writeString(s, DerValue.tag_UTF8String, "UTF-8");
    }

    /**
     * Marshals a string as a DER encoded PrintableString.
     */
    public void putPrintableString(String s) throws IOException {
        writeString(s, DerValue.tag_PrintableString, "US_ASCII");
    }

    /**
     * Marshals a string as a DER encoded T61String.
     */
    public void putT61String(String s) throws IOException {
        /*
         * Works for characters that are defined in both ASCII and
         * T61.
         */
        writeString(s, DerValue.tag_T61String, "ISO-8859-1");
    }

    /**
     * Marshals a string as a DER encoded IA5String.
     */
    public void putIA5String(String s) throws IOException {
        writeString(s, DerValue.tag_IA5String, "US_ASCII");
    }

    /**
     * Marshals a string as a DER encoded BMPString.
     */
    public void putBMPString(String s) throws IOException {
        writeString(s, DerValue.tag_BMPString, "UnicodeBigUnmarked");
    }

    /**
     * Marshals a string as a DER encoded GeneralString.
     */
    public void putGeneralString(String s) throws IOException {
        writeString(s, DerValue.tag_GeneralString, "US_ASCII");
    }

    /**
     * Private helper routine for writing DER encoded string values.
     * @param s the string to write
     * @param stringTag one of the DER string tags that indicate which
     * encoding should be used to write the string out.
     * @param enc the name of the encoder that should be used corresponding
     * to the above tag.
     */
    private void writeString(String s, byte stringTag, String enc)
        throws IOException {

        byte[] data = s.getBytes(enc);
        write(stringTag);
        putLength(data.length);
        write(data);
    }

    /**
     * Marshals a DER UTC time/date value.
     *
     * <P>YYMMDDhhmmss{Z|+hhmm|-hhmm} ... emits only using Zulu time
     * and with seconds (even if seconds=0) as per RFC 3280.
     */
    public void putUTCTime(Date d) throws IOException {
        putTime(d, DerValue.tag_UtcTime);
    }

    /**
     * Marshals a DER Generalized Time/date value.
     *
     * <P>YYYYMMDDhhmmss{Z|+hhmm|-hhmm} ... emits only using Zulu time
     * and with seconds (even if seconds=0) as per RFC 3280.
     */
    public void putGeneralizedTime(Date d) throws IOException {
        putTime(d, DerValue.tag_GeneralizedTime);
    }

    /**
     * Private helper routine for marshalling a DER UTC/Generalized
     * time/date value. If the tag specified is not that for UTC Time
     * then it defaults to Generalized Time.
     * @param d the date to be marshalled
     * @param tag the tag for UTC Time or Generalized Time
     */
    private void putTime(Date d, byte tag) throws IOException {

        /*
         * Format the date.
         */

        TimeZone tz = TimeZone.getTimeZone("GMT");

        Calendar c = Calendar.getInstance(tz);
        c.setTime(d);
        String strYear = Integer.toString(c.get(Calendar.YEAR));

        StringBuffer timeStr = new StringBuffer();

        if (tag == DerValue.tag_UtcTime) {
            // "yy"
            int len = strYear.length();
            if (len <= 2) {
                timeStr.append(strYear);
            } else {
                timeStr.append(strYear.substring(len - 2, len));
            }
        } else {
            // "yyyy"
            tag = DerValue.tag_GeneralizedTime;
            timeStr.append(strYear);
        }

        // adding "MMddHHmmss'Z'"
        int[] n = {
            Calendar.MONTH, Calendar.DAY_OF_MONTH,
            Calendar.HOUR, Calendar.SECOND
        };

        for (int i = 0; i < n.length; i++) {
            String tmp = Integer.toString(c.get(n[i]));
            if (tmp.length() < 2) {
                timeStr.append("0");
            }
            timeStr.append(tmp);
        }

        timeStr.append("'+0000'"); // GMT

        byte[] time = timeStr.toString().getBytes("ISO-8859-1");

        /*
         * Write the formatted date.
         */

        write(tag);
        putLength(time.length);
        write(time);
    }

    /**
     * Put the encoding of the length in the stream.
     *
     * @params len the length of the attribute.
     * @exception IOException on writing errors.
     */
    public void putLength(int len) throws IOException {
        if (len < 128) {
            write((byte)len);

        } else if (len < (1 << 8)) {
            write((byte)0x081);
            write((byte)len);

        } else if (len < (1 << 16)) {
            write((byte)0x082);
            write((byte)(len >> 8));
            write((byte)len);

        } else if (len < (1 << 24)) {
            write((byte)0x083);
            write((byte)(len >> 16));
            write((byte)(len >> 8));
            write((byte)len);

        } else {
            write((byte)0x084);
            write((byte)(len >> 24));
            write((byte)(len >> 16));
            write((byte)(len >> 8));
            write((byte)len);
        }
    }

    /**
     * Put the tag of the attribute in the stream.
     *
     * @params class the tag class type, one of UNIVERSAL, CONTEXT,
     *                            APPLICATION or PRIVATE
     * @params form if true, the value is constructed, otherwise it is
     * primitive.
     * @params val the tag value
     */
    public void putTag(byte tagClass, boolean form, byte val) {
        byte tag = (byte)(tagClass | val);
        if (form) {
            tag |= (byte)0x20;
        }
        write(tag);
    }

    /**
     *  Write the current contents of this <code>DerOutputStream</code>
     *  to an <code>OutputStream</code>.
     *
     *  @exception IOException on output error.
     */
    public void derEncode(OutputStream out) throws IOException {
        out.write(toByteArray());
    }
}