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/**
* Author: Sven Gothel <sgothel@jausoft.com>
* Copyright (c) 2020 Gothel Software e.K.
* Copyright (c) 2020 ZAFENA AB
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package org.direct_bt;
/**
* SMP Long Term Key Info, used for platform agnostic persistence.
* <p>
* Notable: No endian wise conversion shall occur on this data,
* since the encryption values are interpreted as a byte stream.
* </p>
* <p>
* Byte layout must be synchronized with native direct_bt::SMPLongTermKeyInfo
* </p>
* @since 2.2.0
*/
public class SMPLongTermKeyInfo {
/**
* {@link SMPLongTermKeyInfo} Property Bits
*/
static public enum PropertyType {
/** No specific property */
NONE((byte)0),
/** Responder Key (LL slave). Absence indicates Initiator Key (LL master). */
RESPONDER((byte)0x01),
/** Authentication used. */
AUTH((byte)0x02),
/** Secure Connection used. */
SC((byte)0x04);
public final byte value;
/**
* Maps the specified name to a constant of {@link PropertyType}.
* <p>
* Implementation simply returns {@link #valueOf(String)}.
* This maps the constant names itself to their respective constant.
* </p>
* @param name the string name to be mapped to a constant of this enum type.
* @return the corresponding constant of this enum type.
* @throws IllegalArgumentException if the specified name can't be mapped to a constant of this enum type
* as described above.
*/
public static PropertyType get(final String name) throws IllegalArgumentException {
return valueOf(name);
}
/**
* Maps the specified integer value to a constant of {@link PropertyType}.
* @param value the integer value to be mapped to a constant of this enum type.
* @return the corresponding constant of this enum type, using {@link #NONE} if not supported.
*/
public static PropertyType get(final byte value) {
switch(value) {
case (byte) 0x01: return RESPONDER;
case (byte) 0x02: return AUTH;
case (byte) 0x04: return SC;
default: return NONE;
}
}
PropertyType(final byte v) {
value = v;
}
}
/**
* {@link SMPLongTermKeyInfo} {@link PropertyType} Bit Mask
*/
static public class Properties {
/** The {@link PropertyType} bit mask */
public byte mask;
public Properties(final byte v) {
mask = v;
}
public boolean isEmpty() { return 0 == mask; }
public boolean isSet(final PropertyType bit) { return 0 != ( mask & bit.value ); }
public void set(final PropertyType bit) { mask = (byte) ( mask | bit.value ); }
@Override
public String toString() {
int count = 0;
final StringBuilder out = new StringBuilder();
if( isSet(PropertyType.RESPONDER) ) {
out.append(PropertyType.RESPONDER.name()); count++;
}
if( isSet(PropertyType.AUTH) ) {
if( 0 < count ) { out.append(", "); }
out.append(PropertyType.AUTH.name()); count++;
}
if( isSet(PropertyType.SC) ) {
if( 0 < count ) { out.append(", "); }
out.append(PropertyType.SC.name()); count++;
}
return "["+out.toString()+"]";
}
}
/** {@link Properties} bit mask. 1 octet or 8 bits. */
public Properties properties;
/** Encryption Size, 1 octets or 8 bits. Is zero if key is invalid. */
public byte enc_size;
/** Encryption Diversifier, 2 octets or 16 bits. */
public byte ediv[/*2*/];
/** Random Number, 8 octets or 64 bits. */
public byte rand[/*8*/];
/** Long Term Key (LTK), 16 octets or 128 bits. */
public byte ltk[/*16*/];
/**
* Size of the byte stream representation in bytes
* @see #getStream(byte[], int)
*/
public static final int byte_size = 1+1+2+8+16;
/** Construct instance via given source byte array */
public SMPLongTermKeyInfo(final byte source[], final int pos) {
if( byte_size > ( source.length - pos ) ) {
throw new IllegalArgumentException("Stream ( "+source.length+" - "+pos+" ) < "+byte_size+" bytes");
}
ediv = new byte[2];
rand = new byte[8];
ltk = new byte[16];
putStream(source, pos);
}
/** Construct emoty unset instance. */
public SMPLongTermKeyInfo() {
properties = new Properties((byte)0);
enc_size = (byte)0;
ediv = new byte[2];
rand = new byte[8];
ltk = new byte[16];
}
/**
* Method transfers all bytes representing a SMPLongTermKeyInfo from the given
* source array at the given position into this instance.
* <p>
* Implementation is consistent with {@link #getStream(byte[], int)}.
* </p>
* @param source the source array
* @param pos starting position in the source array
* @see #getStream(byte[], int)
*/
public void putStream(final byte[] source, int pos) {
if( byte_size > ( source.length - pos ) ) {
throw new IllegalArgumentException("Stream ( "+source.length+" - "+pos+" ) < "+byte_size+" bytes");
}
properties = new Properties(source[pos++]);
enc_size = source[pos++];
ediv[0] = source[pos++];
ediv[1] = source[pos++];
System.arraycopy(source, pos, rand, 0, 8); pos+=8;
System.arraycopy(source, pos, ltk, 0, 16); pos+=16;
}
/**
* Method transfers all bytes representing this instance into the given
* destination array at the given position.
* <p>
* Implementation is consistent with {@link #SMPLongTermKeyInfo(byte[], int)}.
* </p>
* @param sink the destination array
* @param pos starting position in the destination array
* @see #SMPLongTermKeyInfo(byte[], int)
* @see #putStream(byte[], int)
*/
public final void getStream(final byte[] sink, int pos) {
if( byte_size > ( sink.length - pos ) ) {
throw new IllegalArgumentException("Stream ( "+sink.length+" - "+pos+" ) < "+byte_size+" bytes");
}
sink[pos++] = properties.mask;
sink[pos++] = enc_size;
sink[pos++] = ediv[0];
sink[pos++] = ediv[1];
System.arraycopy(rand, 0, sink, pos, 8); pos+=8;
System.arraycopy(ltk, 0, sink, pos, 16); pos+=16;
}
public final boolean isValid() { return 0 != enc_size; }
@Override
public String toString() { // hex-fmt aligned with btmon
return "LTK[props "+properties.toString()+", enc_size "+enc_size+
", ediv "+BluetoothUtils.bytesHexString(ediv, 0, -1, false /* lsbFirst */, true /* leading0X */, true /* lowerCase */)+
", rand "+BluetoothUtils.bytesHexString(rand, 0, -1, false /* lsbFirst */, true /* leading0X */, true /* lowerCase */)+
", ltk "+BluetoothUtils.bytesHexString(ltk, 0, -1, true /* lsbFirst */, false /* leading0X */, true /* lowerCase */)+
"]";
}
};
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