/****************************************************************************
* 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
// http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf
// http://en.wikipedia.org/wiki/Distinguished_Encoding_Rules#DER_encoding
package com.amazonaws.mobileconnectors.iot;
import java.io.IOException;
import java.math.BigInteger;
/**
* An ASN.1 TLV. The object is not parsed. It can only handle integers and
* strings.
*/
class Asn1Object {
/**
* Type: This is actually called tag in ASN.1. It indicates data type
* (Integer, String) or a construct (sequence, choice, set).
*/
private final int type;
/** Length of the field. */
private final int length;
/** Encoded octet string for the field. */
private final byte[] value;
/** Tag or identifier. */
private final int tag;
/** Bitwise mask used for type. */
private static final byte LOWER_5_BITS = (byte) 0x1F;
/**
* Construct a ASN.1 TLV. The TLV could be either a constructed or primitive
* entity.
* <p/>
* The first byte in DER encoding is made of following fields,
*
* <pre>
* -------------------------------------------------
* |Bit 8|Bit 7|Bit 6|Bit 5|Bit 4|Bit 3|Bit 2|Bit 1|
* -------------------------------------------------
* | Class | CF | + Type |
* -------------------------------------------------
* </pre>
*
* <ul>
* <li>Class: Universal, Application, Context or Private
* <li>CF: Constructed flag. If 1, the field is constructed.
* <li>Type: This is actually called tag in ASN.1. It indicates data type
* (Integer, String) or a construct (sequence, choice, set).
* </ul>
*
* @param tag Tag or Identifier
* @param length Length of the field
* @param value Encoded octet string for the field.
*/
public Asn1Object(int tag, int length, byte[] value) {
this.tag = tag;
this.type = tag & LOWER_5_BITS;
this.length = length;
this.value = value;
}
/**
* getType returns the Asn1Object type.
*
* @return type
*/
public int getType() {
return type;
}
/**
* getLength returns the field length.
*
* @return length
*/
public int getLength() {
return length;
}
/**
* getValue returns the value (encoded octet string).
*
* @return value
*/
public byte[] getValue() {
return value;
}
/**
* isConstructed returns true = object has been constructed, false
* otherwise.
*
* @return value
*/
public boolean isConstructed() {
return (tag & DerParser.CONSTRUCTED) == DerParser.CONSTRUCTED;
}
/**
* For constructed field, return a parser for its content.
*
* @return A parser for the construct.
* @throws IOException if DER cannot be parsed.
*/
public DerParser getParser() throws IOException {
if (!isConstructed()) {
throw new IOException("Invalid DER: can't parse primitive entity"); //$NON-NLS-1$
}
return new DerParser(value);
}
/**
* Get the value as integer.
*
* @return value
* @throws IOException if DER is not an integer.
*/
public BigInteger getInteger() throws IOException {
if (type != DerParser.INTEGER) {
throw new IOException("Invalid DER: object is not integer"); //$NON-NLS-1$
}
return new BigInteger(value);
}
/**
* Get value as string. Most strings are treated as Latin-1.
*
* @return value
* @throws IOException if string encoding is not supported.
*/
public String getString() throws IOException {
String encoding;
switch (type) {
// Not all are Latin-1 but it's the closest thing
case DerParser.NUMERIC_STRING:
case DerParser.PRINTABLE_STRING:
case DerParser.VIDEOTEX_STRING:
case DerParser.IA5_STRING:
case DerParser.GRAPHIC_STRING:
case DerParser.ISO646_STRING:
case DerParser.GENERAL_STRING:
encoding = "ISO-8859-1"; //$NON-NLS-1$
break;
case DerParser.BMP_STRING:
encoding = "UTF-16BE"; //$NON-NLS-1$
break;
case DerParser.UTF8_STRING:
encoding = "UTF-8"; //$NON-NLS-1$
break;
case DerParser.UNIVERSAL_STRING:
throw new IOException("Invalid DER: can't handle UCS-4 string"); //$NON-NLS-1$
default:
throw new IOException("Invalid DER: object is not a string"); //$NON-NLS-1$
}
return new String(value, encoding);
}
}