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package org.whispersystems.libaxolotl.groups.ratchet;
import org.whispersystems.libaxolotl.kdf.HKDFv3;
import org.whispersystems.libaxolotl.util.ByteUtil;
public class SenderMessageKey {
private final int iteration;
private final byte[] iv;
private final byte[] cipherKey;
private final byte[] seed;
public SenderMessageKey(int iteration, byte[] seed) {
byte[] derivative = new HKDFv3().deriveSecrets(seed, "WhisperGroup".getBytes(), 48);
byte[][] parts = ByteUtil.split(derivative, 16, 32);
this.iteration = iteration;
this.seed = seed;
this.iv = parts[0];
this.cipherKey = parts[1];
}
public int getIteration() {
return iteration;
}
public byte[] getIv() {
return iv;
}
public byte[] getCipherKey() {
return cipherKey;
}
public byte[] getSeed() {
return seed;
}
}
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