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package org.bouncycastle.crypto.tls;
import java.security.SecureRandom;
abstract class AbstractTlsContext implements TlsContext {
private SecureRandom secureRandom;
private SecurityParameters securityParameters;
private ProtocolVersion clientVersion = null;
private ProtocolVersion serverVersion = null;
private Object userObject = null;
AbstractTlsContext(SecureRandom secureRandom, SecurityParameters securityParameters) {
this.secureRandom = secureRandom;
this.securityParameters = securityParameters;
}
public SecureRandom getSecureRandom() {
return secureRandom;
}
public SecurityParameters getSecurityParameters() {
return securityParameters;
}
public ProtocolVersion getClientVersion() {
return clientVersion;
}
public void setClientVersion(ProtocolVersion clientVersion) {
this.clientVersion = clientVersion;
}
public ProtocolVersion getServerVersion() {
return serverVersion;
}
public void setServerVersion(ProtocolVersion serverVersion) {
this.serverVersion = serverVersion;
}
public Object getUserObject() {
return userObject;
}
public void setUserObject(Object userObject) {
this.userObject = userObject;
}
public byte[] exportKeyingMaterial(String asciiLabel, byte[] context_value, int length) {
SecurityParameters sp = getSecurityParameters();
byte[] cr = sp.getClientRandom(), sr = sp.getServerRandom();
int seedLength = cr.length + sr.length;
if (context_value != null) {
seedLength += (2 + context_value.length);
}
byte[] seed = new byte[seedLength];
int seedPos = 0;
System.arraycopy(cr, 0, seed, seedPos, cr.length);
seedPos += cr.length;
System.arraycopy(sr, 0, seed, seedPos, sr.length);
seedPos += sr.length;
if (context_value != null) {
TlsUtils.writeUint16(context_value.length, seed, seedPos);
seedPos += 2;
System.arraycopy(context_value, 0, seed, seedPos, context_value.length);
seedPos += context_value.length;
}
if (seedPos != seedLength) {
throw new IllegalStateException("error in calculation of seed for export");
}
return TlsUtils.PRF(this, sp.getMasterSecret(), asciiLabel, seed, length);
}
}
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