java/10 : java.base/sun/security/util/DerInputStream.java

DerInputStream
https://openjdk.java.net/
GPLv2 + Classpath Exception
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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package sun.security.util;

import java.io.InputStream;
import java.io.IOException;
import java.io.EOFException;
import java.util.Date;
import java.util.Vector;
import java.math.BigInteger;
import java.io.DataInputStream;

A DER input stream, used for parsing ASN.1 DER-encoded data such as
that found in X.509 certificates.  DER is a subset of BER/1, which has
the advantage that it allows only a single encoding of primitive data.
(High level data such as dates still support many encodings.)  That is,
it uses the "Definite" Encoding Rules (DER) not the "Basic" ones (BER).
Note that, like BER/1, DER streams are streams of explicitly
tagged data values.  Accordingly, this programming interface does
not expose any variant of the java.io.InputStream interface, since
that kind of input stream holds untagged data values and using that
I/O model could prevent correct parsing of the DER data.
At this time, this class supports only a subset of the types of DER
data encodings which are defined.  That subset is sufficient for parsing
most X.509 certificates.
Author: David Brownell, Amit Kapoor, Hemma Prafullchandra/**
 * A DER input stream, used for parsing ASN.1 DER-encoded data such as
 * that found in X.509 certificates.  DER is a subset of BER/1, which has
 * the advantage that it allows only a single encoding of primitive data.
 * (High level data such as dates still support many encodings.)  That is,
 * it uses the "Definite" Encoding Rules (DER) not the "Basic" ones (BER).
 *
 * <P>Note that, like BER/1, DER streams are streams of explicitly
 * tagged data values.  Accordingly, this programming interface does
 * not expose any variant of the java.io.InputStream interface, since
 * that kind of input stream holds untagged data values and using that
 * I/O model could prevent correct parsing of the DER data.
 *
 * <P>At this time, this class supports only a subset of the types of DER
 * data encodings which are defined.  That subset is sufficient for parsing
 * most X.509 certificates.
 *
 *
 * @author David Brownell
 * @author Amit Kapoor
 * @author Hemma Prafullchandra
 */

public class DerInputStream {

    /*
     * This version only supports fully buffered DER.  This is easy to
     * work with, though if large objects are manipulated DER becomes
     * awkward to deal with.  That's where BER is useful, since BER
     * handles streaming data relatively well.
     */
    DerInputBuffer      buffer;

    The DER tag of the value; one of the tag_ constants. /** The DER tag of the value; one of the tag_ constants. */
    public byte         tag;

    Create a DER input stream from a data buffer.  The buffer is not
copied, it is shared.  Accordingly, the buffer should be treated
as read-only.
Params: data – the buffer from which to create the string (CONSUMED)/**
     * Create a DER input stream from a data buffer.  The buffer is not
     * copied, it is shared.  Accordingly, the buffer should be treated
     * as read-only.
     *
     * @param data the buffer from which to create the string (CONSUMED)
     */
    public DerInputStream(byte[] data) throws IOException {
        init(data, 0, data.length, true);
    }

    Create a DER input stream from part of a data buffer with
additional arg to control whether DER checks are enforced.
The buffer is not copied, it is shared.  Accordingly, the
buffer should be treated as read-only.
Params: data – the buffer from which to create the string (CONSUMED)
offset – the first index of data which will
         be read as DER input in the new stream
len – how long a chunk of the buffer to use,
         starting at "offset"
allowBER – whether to allow constructed indefinite-length
         encoding as well as tolerate leading 0s/**
     * Create a DER input stream from part of a data buffer with
     * additional arg to control whether DER checks are enforced.
     * The buffer is not copied, it is shared.  Accordingly, the
     * buffer should be treated as read-only.
     *
     * @param data the buffer from which to create the string (CONSUMED)
     * @param offset the first index of <em>data</em> which will
     *          be read as DER input in the new stream
     * @param len how long a chunk of the buffer to use,
     *          starting at "offset"
     * @param allowBER whether to allow constructed indefinite-length
     *          encoding as well as tolerate leading 0s
     */
    public DerInputStream(byte[] data, int offset, int len,
        boolean allowBER) throws IOException {
        init(data, offset, len, allowBER);
    }

    Create a DER input stream from part of a data buffer.
The buffer is not copied, it is shared.  Accordingly, the
buffer should be treated as read-only.
Params: data – the buffer from which to create the string (CONSUMED)
offset – the first index of data which will
         be read as DER input in the new stream
len – how long a chunk of the buffer to use,
         starting at "offset"/**
     * Create a DER input stream from part of a data buffer.
     * The buffer is not copied, it is shared.  Accordingly, the
     * buffer should be treated as read-only.
     *
     * @param data the buffer from which to create the string (CONSUMED)
     * @param offset the first index of <em>data</em> which will
     *          be read as DER input in the new stream
     * @param len how long a chunk of the buffer to use,
     *          starting at "offset"
     */
    public DerInputStream(byte[] data, int offset, int len) throws IOException {
        init(data, offset, len, true);
    }

    /*
     * private helper routine
     */
    private void init(byte[] data, int offset, int len, boolean allowBER) throws IOException {
        if ((offset+2 > data.length) || (offset+len > data.length)) {
            throw new IOException("Encoding bytes too short");
        }
        // check for indefinite length encoding
        if (DerIndefLenConverter.isIndefinite(data[offset+1])) {
            if (!allowBER) {
                throw new IOException("Indefinite length BER encoding found");
            } else {
                byte[] inData = new byte[len];
                System.arraycopy(data, offset, inData, 0, len);

                DerIndefLenConverter derIn = new DerIndefLenConverter();
                buffer = new DerInputBuffer(derIn.convert(inData), allowBER);
            }
        } else {
            buffer = new DerInputBuffer(data, offset, len, allowBER);
        }
        buffer.mark(Integer.MAX_VALUE);
    }

    DerInputStream(DerInputBuffer buf) {
        buffer = buf;
        buffer.mark(Integer.MAX_VALUE);
    }

    Creates a new DER input stream from part of this input stream.
Params: len – how long a chunk of the current input stream to use,
         starting at the current position.
do_skip – true if the existing data in the input stream should
         be skipped.  If this value is false, the next data read
         on this stream and the newly created stream will be the
         same./**
     * Creates a new DER input stream from part of this input stream.
     *
     * @param len how long a chunk of the current input stream to use,
     *          starting at the current position.
     * @param do_skip true if the existing data in the input stream should
     *          be skipped.  If this value is false, the next data read
     *          on this stream and the newly created stream will be the
     *          same.
     */
    public DerInputStream subStream(int len, boolean do_skip)
    throws IOException {
        DerInputBuffer newbuf = buffer.dup();

        newbuf.truncate(len);
        if (do_skip) {
            buffer.skip(len);
        }
        return new DerInputStream(newbuf);
    }

    Return what has been written to this DerInputStream
as a byte array. Useful for debugging.
/**
     * Return what has been written to this DerInputStream
     * as a byte array. Useful for debugging.
     */
    public byte[] toByteArray() {
        return buffer.toByteArray();
    }

    /*
     * PRIMITIVES -- these are "universal" ASN.1 simple types.
     *
     *  INTEGER, ENUMERATED, BIT STRING, OCTET STRING, NULL
     *  OBJECT IDENTIFIER, SEQUENCE (OF), SET (OF)
     *  UTF8String, PrintableString, T61String, IA5String, UTCTime,
     *  GeneralizedTime, BMPString.
     * Note: UniversalString not supported till encoder is available.
     */

    Get an integer from the input stream as an integer.
Returns: the integer held in this DER input stream./**
     * Get an integer from the input stream as an integer.
     *
     * @return the integer held in this DER input stream.
     */
    public int getInteger() throws IOException {
        if (buffer.read() != DerValue.tag_Integer) {
            throw new IOException("DER input, Integer tag error");
        }
        return buffer.getInteger(getDefiniteLength(buffer));
    }

    Get a integer from the input stream as a BigInteger object.
Returns: the integer held in this DER input stream./**
     * Get a integer from the input stream as a BigInteger object.
     *
     * @return the integer held in this DER input stream.
     */
    public BigInteger getBigInteger() throws IOException {
        if (buffer.read() != DerValue.tag_Integer) {
            throw new IOException("DER input, Integer tag error");
        }
        return buffer.getBigInteger(getDefiniteLength(buffer), false);
    }

    Returns an ASN.1 INTEGER value as a positive BigInteger.
This is just to deal with implementations that incorrectly encode
some values as negative.
Returns: the integer held in this DER value as a BigInteger./**
     * Returns an ASN.1 INTEGER value as a positive BigInteger.
     * This is just to deal with implementations that incorrectly encode
     * some values as negative.
     *
     * @return the integer held in this DER value as a BigInteger.
     */
    public BigInteger getPositiveBigInteger() throws IOException {
        if (buffer.read() != DerValue.tag_Integer) {
            throw new IOException("DER input, Integer tag error");
        }
        return buffer.getBigInteger(getDefiniteLength(buffer), true);
    }

    Get an enumerated from the input stream.
Returns: the integer held in this DER input stream./**
     * Get an enumerated from the input stream.
     *
     * @return the integer held in this DER input stream.
     */
    public int getEnumerated() throws IOException {
        if (buffer.read() != DerValue.tag_Enumerated) {
            throw new IOException("DER input, Enumerated tag error");
        }
        return buffer.getInteger(getDefiniteLength(buffer));
    }

    Get a bit string from the input stream. Padded bits (if any)
will be stripped off before the bit string is returned.
/**
     * Get a bit string from the input stream. Padded bits (if any)
     * will be stripped off before the bit string is returned.
     */
    public byte[] getBitString() throws IOException {
        if (buffer.read() != DerValue.tag_BitString)
            throw new IOException("DER input not an bit string");

        return buffer.getBitString(getDefiniteLength(buffer));
    }

    Get a bit string from the input stream.  The bit string need
not be byte-aligned.
/**
     * Get a bit string from the input stream.  The bit string need
     * not be byte-aligned.
     */
    public BitArray getUnalignedBitString() throws IOException {
        if (buffer.read() != DerValue.tag_BitString) {
            throw new IOException("DER input not a bit string");
        }

        int length = getDefiniteLength(buffer);

        if (length == 0) {
            return new BitArray(0);
        }

        /*
         * First byte = number of excess bits in the last octet of the
         * representation.
         */
        length--;
        int excessBits = buffer.read();
        if (excessBits < 0) {
            throw new IOException("Unused bits of bit string invalid");
        }
        int validBits = length*8 - excessBits;
        if (validBits < 0) {
            throw new IOException("Valid bits of bit string invalid");
        }

        byte[] repn = new byte[length];

        if ((length != 0) && (buffer.read(repn) != length)) {
            throw new IOException("Short read of DER bit string");
        }

        return new BitArray(validBits, repn);
    }

    Returns an ASN.1 OCTET STRING from the input stream.
/**
     * Returns an ASN.1 OCTET STRING from the input stream.
     */
    public byte[] getOctetString() throws IOException {
        if (buffer.read() != DerValue.tag_OctetString)
            throw new IOException("DER input not an octet string");

        int length = getDefiniteLength(buffer);
        byte[] retval = new byte[length];
        if ((length != 0) && (buffer.read(retval) != length))
            throw new IOException("Short read of DER octet string");

        return retval;
    }

    Returns the asked number of bytes from the input stream.
/**
     * Returns the asked number of bytes from the input stream.
     */
    public void getBytes(byte[] val) throws IOException {
        if ((val.length != 0) && (buffer.read(val) != val.length)) {
            throw new IOException("Short read of DER octet string");
        }
    }

    Reads an encoded null value from the input stream.
/**
     * Reads an encoded null value from the input stream.
     */
    public void getNull() throws IOException {
        if (buffer.read() != DerValue.tag_Null || buffer.read() != 0)
            throw new IOException("getNull, bad data");
    }

    Reads an X.200 style Object Identifier from the stream.
/**
     * Reads an X.200 style Object Identifier from the stream.
     */
    public ObjectIdentifier getOID() throws IOException {
        return new ObjectIdentifier(this);
    }

    Return a sequence of encoded entities.  ASN.1 sequences are
ordered, and they are often used, like a "struct" in C or C++,
to group data values.  They may have optional or context
specific values.
Params: startLen – guess about how long the sequence will be
         (used to initialize an auto-growing data structure)
Returns: array of the values in the sequence/**
     * Return a sequence of encoded entities.  ASN.1 sequences are
     * ordered, and they are often used, like a "struct" in C or C++,
     * to group data values.  They may have optional or context
     * specific values.
     *
     * @param startLen guess about how long the sequence will be
     *          (used to initialize an auto-growing data structure)
     * @return array of the values in the sequence
     */
    public DerValue[] getSequence(int startLen) throws IOException {
        tag = (byte)buffer.read();
        if (tag != DerValue.tag_Sequence)
            throw new IOException("Sequence tag error");
        return readVector(startLen);
    }

    Return a set of encoded entities.  ASN.1 sets are unordered,
though DER may specify an order for some kinds of sets (such
as the attributes in an X.500 relative distinguished name)
to facilitate binary comparisons of encoded values.
Params: startLen – guess about how large the set will be
         (used to initialize an auto-growing data structure)
Returns: array of the values in the sequence/**
     * Return a set of encoded entities.  ASN.1 sets are unordered,
     * though DER may specify an order for some kinds of sets (such
     * as the attributes in an X.500 relative distinguished name)
     * to facilitate binary comparisons of encoded values.
     *
     * @param startLen guess about how large the set will be
     *          (used to initialize an auto-growing data structure)
     * @return array of the values in the sequence
     */
    public DerValue[] getSet(int startLen) throws IOException {
        tag = (byte)buffer.read();
        if (tag != DerValue.tag_Set)
            throw new IOException("Set tag error");
        return readVector(startLen);
    }

    Return a set of encoded entities.  ASN.1 sets are unordered,
though DER may specify an order for some kinds of sets (such
as the attributes in an X.500 relative distinguished name)
to facilitate binary comparisons of encoded values.
Params: startLen – guess about how large the set will be
         (used to initialize an auto-growing data structure)
implicit – if true tag is assumed implicit.
Returns: array of the values in the sequence/**
     * Return a set of encoded entities.  ASN.1 sets are unordered,
     * though DER may specify an order for some kinds of sets (such
     * as the attributes in an X.500 relative distinguished name)
     * to facilitate binary comparisons of encoded values.
     *
     * @param startLen guess about how large the set will be
     *          (used to initialize an auto-growing data structure)
     * @param implicit if true tag is assumed implicit.
     * @return array of the values in the sequence
     */
    public DerValue[] getSet(int startLen, boolean implicit)
        throws IOException {
        tag = (byte)buffer.read();
        if (!implicit) {
            if (tag != DerValue.tag_Set) {
                throw new IOException("Set tag error");
            }
        }
        return (readVector(startLen));
    }

    /*
     * Read a "vector" of values ... set or sequence have the
     * same encoding, except for the initial tag, so both use
     * this same helper routine.
     */
    protected DerValue[] readVector(int startLen) throws IOException {
        DerInputStream  newstr;

        byte lenByte = (byte)buffer.read();
        int len = getLength(lenByte, buffer);

        if (len == -1) {
           // indefinite length encoding found
           int readLen = buffer.available();
           int offset = 2;     // for tag and length bytes
           byte[] indefData = new byte[readLen + offset];
           indefData[0] = tag;
           indefData[1] = lenByte;
           DataInputStream dis = new DataInputStream(buffer);
           dis.readFully(indefData, offset, readLen);
           dis.close();
           DerIndefLenConverter derIn = new DerIndefLenConverter();
           buffer = new DerInputBuffer(derIn.convert(indefData), buffer.allowBER);

           if (tag != buffer.read())
                throw new IOException("Indefinite length encoding" +
                        " not supported");
           len = DerInputStream.getDefiniteLength(buffer);
        }

        if (len == 0)
            // return empty array instead of null, which should be
            // used only for missing optionals
            return new DerValue[0];

        /*
         * Create a temporary stream from which to read the data,
         * unless it's not really needed.
         */
        if (buffer.available() == len)
            newstr = this;
        else
            newstr = subStream(len, true);

        /*
         * Pull values out of the stream.
         */
        Vector<DerValue> vec = new Vector<>(startLen);
        DerValue value;

        do {
            value = new DerValue(newstr.buffer, buffer.allowBER);
            vec.addElement(value);
        } while (newstr.available() > 0);

        if (newstr.available() != 0)
            throw new IOException("Extra data at end of vector");

        /*
         * Now stick them into the array we're returning.
         */
        int             i, max = vec.size();
        DerValue[]      retval = new DerValue[max];

        for (i = 0; i < max; i++)
            retval[i] = vec.elementAt(i);

        return retval;
    }

    Get a single DER-encoded value from the input stream.
It can often be useful to pull a value from the stream
and defer parsing it.  For example, you can pull a nested
sequence out with one call, and only examine its elements
later when you really need to.
/**
     * Get a single DER-encoded value from the input stream.
     * It can often be useful to pull a value from the stream
     * and defer parsing it.  For example, you can pull a nested
     * sequence out with one call, and only examine its elements
     * later when you really need to.
     */
    public DerValue getDerValue() throws IOException {
        return new DerValue(buffer);
    }

    Read a string that was encoded as a UTF8String DER value.
/**
     * Read a string that was encoded as a UTF8String DER value.
     */
    public String getUTF8String() throws IOException {
        return readString(DerValue.tag_UTF8String, "UTF-8", "UTF8");
    }

    Read a string that was encoded as a PrintableString DER value.
/**
     * Read a string that was encoded as a PrintableString DER value.
     */
    public String getPrintableString() throws IOException {
        return readString(DerValue.tag_PrintableString, "Printable",
                          "ASCII");
    }

    Read a string that was encoded as a T61String DER value.
/**
     * Read a string that was encoded as a T61String DER value.
     */
    public String getT61String() throws IOException {
        /*
         * Works for common characters between T61 and ASCII.
         */
        return readString(DerValue.tag_T61String, "T61", "ISO-8859-1");
    }

    Read a string that was encoded as a IA5tring DER value.
/**
     * Read a string that was encoded as a IA5tring DER value.
     */
    public String getIA5String() throws IOException {
        return readString(DerValue.tag_IA5String, "IA5", "ASCII");
    }

    Read a string that was encoded as a BMPString DER value.
/**
     * Read a string that was encoded as a BMPString DER value.
     */
    public String getBMPString() throws IOException {
        return readString(DerValue.tag_BMPString, "BMP",
                          "UnicodeBigUnmarked");
    }

    Read a string that was encoded as a GeneralString DER value.
/**
     * Read a string that was encoded as a GeneralString DER value.
     */
    public String getGeneralString() throws IOException {
        return readString(DerValue.tag_GeneralString, "General",
                          "ASCII");
    }

    Private helper routine to read an encoded string from the input
stream.
Params: stringTag – the tag for the type of string to read
stringName – a name to display in error messages
enc – the encoder to use to interpret the data. Should
correspond to the stringTag above./**
     * Private helper routine to read an encoded string from the input
     * stream.
     * @param stringTag the tag for the type of string to read
     * @param stringName a name to display in error messages
     * @param enc the encoder to use to interpret the data. Should
     * correspond to the stringTag above.
     */
    private String readString(byte stringTag, String stringName,
                              String enc) throws IOException {

        if (buffer.read() != stringTag)
            throw new IOException("DER input not a " +
                                  stringName + " string");

        int length = getDefiniteLength(buffer);
        byte[] retval = new byte[length];
        if ((length != 0) && (buffer.read(retval) != length))
            throw new IOException("Short read of DER " +
                                  stringName + " string");

        return new String(retval, enc);
    }

    Get a UTC encoded time value from the input stream.
/**
     * Get a UTC encoded time value from the input stream.
     */
    public Date getUTCTime() throws IOException {
        if (buffer.read() != DerValue.tag_UtcTime)
            throw new IOException("DER input, UTCtime tag invalid ");
        return buffer.getUTCTime(getDefiniteLength(buffer));
    }

    Get a Generalized encoded time value from the input stream.
/**
     * Get a Generalized encoded time value from the input stream.
     */
    public Date getGeneralizedTime() throws IOException {
        if (buffer.read() != DerValue.tag_GeneralizedTime)
            throw new IOException("DER input, GeneralizedTime tag invalid ");
        return buffer.getGeneralizedTime(getDefiniteLength(buffer));
    }

    /*
     * Get a byte from the input stream.
     */
    // package private
    int getByte() throws IOException {
        return (0x00ff & buffer.read());
    }

    public int peekByte() throws IOException {
        return buffer.peek();
    }

    // package private
    int getLength() throws IOException {
        return getLength(buffer);
    }

    /*
     * Get a length from the input stream, allowing for at most 32 bits of
     * encoding to be used.  (Not the same as getting a tagged integer!)
     *
     * @return the length or -1 if indefinite length found.
     * @exception IOException on parsing error or unsupported lengths.
     */
    static int getLength(InputStream in) throws IOException {
        return getLength(in.read(), in);
    }

    /*
     * Get a length from the input stream, allowing for at most 32 bits of
     * encoding to be used.  (Not the same as getting a tagged integer!)
     *
     * @return the length or -1 if indefinite length found.
     * @exception IOException on parsing error or unsupported lengths.
     */
    static int getLength(int lenByte, InputStream in) throws IOException {
        int value, tmp;
        if (lenByte == -1) {
            throw new IOException("Short read of DER length");
        }

        String mdName = "DerInputStream.getLength(): ";
        tmp = lenByte;
        if ((tmp & 0x080) == 0x00) { // short form, 1 byte datum
            value = tmp;
        } else {                     // long form or indefinite
            tmp &= 0x07f;

            /*
             * NOTE:  tmp == 0 indicates indefinite length encoded data.
             * tmp > 4 indicates more than 4Gb of data.
             */
            if (tmp == 0)
                return -1;
            if (tmp < 0 || tmp > 4)
                throw new IOException(mdName + "lengthTag=" + tmp + ", "
                    + ((tmp < 0) ? "incorrect DER encoding." : "too big."));

            value = 0x0ff & in.read();
            tmp--;
            if (value == 0) {
                // DER requires length value be encoded in minimum number of bytes
                throw new IOException(mdName + "Redundant length bytes found");
            }
            while (tmp-- > 0) {
                value <<= 8;
                value += 0x0ff & in.read();
            }
            if (value < 0) {
                throw new IOException(mdName + "Invalid length bytes");
            } else if (value <= 127) {
                throw new IOException(mdName + "Should use short form for length");
            }
        }
        return value;
    }

    int getDefiniteLength() throws IOException {
        return getDefiniteLength(buffer);
    }

    /*
     * Get a length from the input stream.
     *
     * @return the length
     * @exception IOException on parsing error or if indefinite length found.
     */
    static int getDefiniteLength(InputStream in) throws IOException {
        int len = getLength(in);
        if (len < 0) {
            throw new IOException("Indefinite length encoding not supported");
        }
        return len;
    }

    Mark the current position in the buffer, so that
a later call to reset will return here.
/**
     * Mark the current position in the buffer, so that
     * a later call to <code>reset</code> will return here.
     */
    public void mark(int value) { buffer.mark(value); }


    Return to the position of the last mark
call.  A mark is implicitly set at the beginning of
the stream when it is created.
/**
     * Return to the position of the last <code>mark</code>
     * call.  A mark is implicitly set at the beginning of
     * the stream when it is created.
     */
    public void reset() { buffer.reset(); }


    Returns the number of bytes available for reading.
This is most useful for testing whether the stream is
empty.
/**
     * Returns the number of bytes available for reading.
     * This is most useful for testing whether the stream is
     * empty.
     */
    public int available() { return buffer.available(); }
}
Params:	startLen – guess about how long the sequence will be (used to initialize an auto-growing data structure)
Returns:	array of the values in the sequence
Params:	startLen – guess about how large the set will be (used to initialize an auto-growing data structure)
Returns:	array of the values in the sequence
/

java/ 10/ java.base/sun/security/util/DerInputStream.java
