org.apache.sshd.common.util.io.der.ASN1Class Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
package org.apache.sshd.common.util.io.der;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import org.apache.sshd.common.util.GenericUtils;
/**
* @author Apache MINA SSHD Project
*/
public enum ASN1Class {
// NOTE: order is crucial, so DON'T change it
UNIVERSAL((byte) 0x00),
APPLICATION((byte) 0x01),
CONTEXT((byte) 0x02),
PRIVATE((byte) 0x03);
public static final List VALUES = Collections.unmodifiableList(Arrays.asList(values()));
private final byte byteValue;
ASN1Class(byte classValue) {
byteValue = classValue;
}
public byte getClassValue() {
return byteValue;
}
public static ASN1Class fromName(String s) {
if (GenericUtils.isEmpty(s)) {
return null;
}
for (ASN1Class c : VALUES) {
if (s.equalsIgnoreCase(c.name())) {
return c;
}
}
return null;
}
/**
*
* The first byte in DER encoding is made of following fields
*
*
*
*-------------------------------------------------
*|Bit 8|Bit 7|Bit 6|Bit 5|Bit 4|Bit 3|Bit 2|Bit 1|
*-------------------------------------------------
*| Class | CF | Type |
*-------------------------------------------------
*
*
* @param value The original DER encoded byte
* @return The {@link ASN1Class} value - {@code null} if no match found
* @see #fromTypeValue(int)
*/
public static ASN1Class fromDERValue(int value) {
return fromTypeValue((value >> 6) & 0x03);
}
/**
* @param value The "pure" value - unshifted and with no extras
* @return The {@link ASN1Class} value - {@code null} if no match found
*/
public static ASN1Class fromTypeValue(int value) {
// all 4 values are defined
if ((value < 0) || (value >= VALUES.size())) {
return null;
}
return VALUES.get(value);
}
}