/**************************************************************************** * Amazon Modifications: Copyright 2016 Amazon.com, Inc. or its affiliates. * All Rights Reserved. ***************************************************************************** * Copyright (c) 1998-2010 AOL Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * ****************************************************************************/ // http://oauth.googlecode.com/svn/code/branches/jmeter/jmeter/src/main/java/org/apache/jmeter/protocol/oauth/sampler/PrivateKeyReader.java package com.amazonaws.mobileconnectors.iot; import java.io.ByteArrayInputStream; import java.io.IOException; import java.io.InputStream; import java.math.BigInteger; /** * A bare-minimum ASN.1 DER decoder, just having enough functions to decode * PKCS#1 private keys. Especially, it doesn't handle explicitly tagged types * with an outer tag. This parser can only handle one layer. To parse nested * constructs, get a new parser for each layer using * Asn1Object.getParser(). There are many DER decoders in JRE but * using them will tie this program to a specific JCE/JVM. */ class DerParser { // Classes /** UNIVERSAL class. */ public static final int UNIVERSAL = 0x00; /** APPLICATION class. */ public static final int APPLICATION = 0x40; /** CONTEXT class. */ public static final int CONTEXT = 0x80; /** PRIVATE class. */ public static final int PRIVATE = 0xC0; /** Constructed Flag. */ public static final int CONSTRUCTED = 0x20; // Tag and data types /** ANY tag/type. */ public static final int ANY = 0x00; /** BOOLEAN tag/type. */ public static final int BOOLEAN = 0x01; /** INTEGER tag/type. */ public static final int INTEGER = 0x02; /** BIT_STRING tag/type. */ public static final int BIT_STRING = 0x03; /** OCTET_STRING tag/type. */ public static final int OCTET_STRING = 0x04; /** NULL tag/type. */ public static final int NULL = 0x05; /** OBJECT_IDENTIFIER tag/type. */ public static final int OBJECT_IDENTIFIER = 0x06; /** REAL tag/type. */ public static final int REAL = 0x09; /** ENUMERATED tag/type. */ public static final int ENUMERATED = 0x0a; /** RELATIVE_OID tag/type. */ public static final int RELATIVE_OID = 0x0d; /** v tag/type. */ public static final int SEQUENCE = 0x10; /** SET tag/type. */ public static final int SET = 0x11; /** NUMERIC_STRING tag/type. */ public static final int NUMERIC_STRING = 0x12; /** PRINTABLE_STRING tag/type. */ public static final int PRINTABLE_STRING = 0x13; /** T61_STRING tag/type. */ public static final int T61_STRING = 0x14; /** VIDEOTEX_STRING tag/type. */ public static final int VIDEOTEX_STRING = 0x15; /** IA5_STRING tag/type. */ public static final int IA5_STRING = 0x16; /** GRAPHIC_STRING tag/type. */ public static final int GRAPHIC_STRING = 0x19; /** ISO646_STRING tag/type. */ public static final int ISO646_STRING = 0x1A; /** GENERAL_STRING tag/type. */ public static final int GENERAL_STRING = 0x1B; /** UTF8_STRING tag/type. */ public static final int UTF8_STRING = 0x0C; /** UNIVERSAL_STRING tag/type. */ public static final int UNIVERSAL_STRING = 0x1C; /** BMP_STRING tag/type. */ public static final int BMP_STRING = 0x1E; /** UTC_TIME tag/type. */ public static final int UTC_TIME = 0x17; /** GENERALIZED_TIME tag/type. */ public static final int GENERALIZED_TIME = 0x18; /** Lower 7 bits mask. */ public static final byte LOWER_7_BITS = (byte) 0x7F; /** Byte max value. */ public static final int BYTE_MAX = (int) 0xFF; /** We can't handle length longer than 4 bytes. */ public static final int MAX_NUMBER_OF_BYTES = 4; /** The DER encoded input stream. */ private final InputStream in; /** * Create a new DER decoder from an input stream. * * @param in DER encoded stream */ public DerParser(InputStream in) { this.in = in; } /** * Create a new DER decoder from a byte array. * * @param bytes encoded bytes */ public DerParser(byte[] bytes) { this(new ByteArrayInputStream(bytes)); } /** * Read next object. If it's constructed, the value holds encoded content * and it should be parsed by a new parser from * Asn1Object.getParser. * * @return Asn1Object read * @throws IOException if DER parsing error (format). */ public Asn1Object read() throws IOException { int tag = in.read(); if (tag == -1) { throw new IOException("Invalid DER: stream too short, missing tag"); //$NON-NLS-1$ } int length = getLength(); byte[] value = new byte[length]; int n = in.read(value); if (n < length) { throw new IOException("Invalid DER: stream too short, missing value"); //$NON-NLS-1$ } Asn1Object o = new Asn1Object(tag, length, value); return o; } /** * Decode the length of the field. Can only support length encoding up to 4 * octets. *

* In BER/DER encoding, length can be encoded in 2 forms, *

* * @return The length as integer * @throws IOException if invalid DER. */ private int getLength() throws IOException { int i = in.read(); if (i == -1) { throw new IOException("Invalid DER: length missing"); //$NON-NLS-1$ } // A single byte short length if ((i & ~LOWER_7_BITS) == 0) { return i; } int num = i & LOWER_7_BITS; if (i >= BYTE_MAX || num > MAX_NUMBER_OF_BYTES) { throw new IOException("Invalid DER: length field too big (" + i + ")"); //$NON-NLS-1$ } byte[] bytes = new byte[num]; int n = in.read(bytes); if (n < num) { throw new IOException("Invalid DER: length too short"); //$NON-NLS-1$ } return new BigInteger(1, bytes).intValue(); } }