Many resources are needed to download a project. Please understand that we have to compensate our server costs. Thank you in advance. Project price only 1 $
You can buy this project and download/modify it how often you want.
/*
* Copyright 2009-2021 Roland Huss
*
* 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.
*/
package org.jolokia.jvmagent.security.asn1;
public class DERInteger implements DERObject {
private static final byte DER_INTEGER_TAG = 0x02;
private final int value;
public DERInteger(int value) {
this.value = value;
}
@Override
public byte[] getEncoded() {
// encoded values can be checked using:
// $ echo 0203FF7FFF | xxd -p -r | openssl asn1parse -inform der -i
// 0:d=0 hl=2 l= 3 prim: INTEGER :-8001
int v = value;
if (value < 0) {
v = (-value - 1) & 0x7fffffff;
}
if (v < 0x80) {
// from 020180 = -0x80 to 02017F = 0x7F, including 020100 == 0x00
return value < 0
? new byte[] { DER_INTEGER_TAG, 0x01, (byte) (0x7f - v | 0x80) }
: new byte[] { DER_INTEGER_TAG, 0x01, (byte) v };
} else if (v < 0x8000) {
// from 02028000 = -0x8000 to 0202FF7F = -0x81 and
// from 02020080 = 0x80 to 02027FFF = 0x7FFF
if (value < 0) {
v = 0x7fff - v;
return new byte[] { DER_INTEGER_TAG, 0x02,
(byte) (((v & 0x7f00) >> 8) | 0x80),
(byte) (v & 0xff)
};
}
return new byte[] { DER_INTEGER_TAG, 0x02,
(byte) ((v & 0x7f00) >> 8),
(byte) (v & 0xff)
};
} else if (v < 0x800000) {
// from 0203800000 = -0x800000 to 0203FF7FFF = -0x8001 and
// from 0203008000 = 0x8000 to 02037FFFFF = 0x7FFFFF
if (value < 0) {
v = 0x7fffff - v;
return new byte[] { DER_INTEGER_TAG, 0x03,
(byte) (((v & 0x7f0000) >> 16) | 0x80),
(byte) ((v & 0xff00) >> 8),
(byte) (v & 0xff)
};
}
return new byte[] { DER_INTEGER_TAG, 0x03,
(byte) ((v & 0x7f0000) >> 16),
(byte) ((v & 0xff00) >> 8),
(byte) (v & 0xff)
};
} else {
// from 020380000000 = -0x80000000 to 0203FF7FFFFF = -0x800001 and
// from 020300800000 = 0x800000 to 02037FFFFFFF = 0x7FFFFFFF
if (value < 0) {
v = 0x7fffffff - v;
return new byte[] { DER_INTEGER_TAG, 0x04,
(byte) (((v & 0x7f000000) >> 24) | 0x80),
(byte) ((v & 0xff0000) >> 16),
(byte) ((v & 0xff00) >> 8),
(byte) (v & 0xff)
};
}
return new byte[] { DER_INTEGER_TAG, 0x04,
(byte) ((v & 0x7f000000) >> 24),
(byte) ((v & 0xff0000) >> 16),
(byte) ((v & 0xff00) >> 8),
(byte) (v & 0xff)
};
}
}
@Override
public boolean isPrimitive() {
return true;
}
}
