Mercurial > 510Connectbot
view app/src/main/java/ch/ethz/ssh2/crypto/dh/GenericDhExchange.java @ 489:b257517e9bef
Added tag stable-1.9.4-1 for changeset 869070df0e80
author | Carl Byington <carl@five-ten-sg.com> |
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date | Wed, 14 Oct 2020 12:26:53 -0700 |
parents | d29cce60f393 |
children |
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package ch.ethz.ssh2.crypto.dh; import java.io.IOException; import java.io.UnsupportedEncodingException; import java.math.BigInteger; import ch.ethz.ssh2.crypto.digest.HashForSSH2Types; import ch.ethz.ssh2.log.Logger; /** * DhExchange. * * @author Christian Plattner, plattner@trilead.com * @version $Id: DhExchange.java,v 1.2 2008/04/01 12:38:09 cplattne Exp $ */ public abstract class GenericDhExchange { private static final Logger log = Logger.getLogger(GenericDhExchange.class); /* Shared secret */ BigInteger sharedSecret; protected GenericDhExchange() { } public static GenericDhExchange getInstance(String algo) { if (algo.startsWith("ecdh-sha2-")) { return new EcDhExchange(); } else { return new DhExchange(); } } public abstract void init(String name) throws IOException; /** * @return Returns the e (public value) * @throws IllegalStateException */ public abstract byte[] getE(); public void setE(BigInteger e) throws IOException { throw new IOException(); } /** * @return Returns the server's e (public value) * @throws IllegalStateException */ protected abstract byte[] getServerE(); /** * @return Returns the shared secret k. * @throws IllegalStateException */ public BigInteger getK() { if (sharedSecret == null) throw new IllegalStateException("Shared secret not yet known, need f first!"); return sharedSecret; } /** * @param f */ public void setF(BigInteger f) throws IOException { setF(f.toByteArray()); } public abstract byte[] getF(); public abstract void setF(byte[] f) throws IOException; public byte[] calculateH(byte[] clientversion, byte[] serverversion, byte[] clientKexPayload, byte[] serverKexPayload, byte[] hostKey) throws UnsupportedEncodingException, IOException { HashForSSH2Types hash = new HashForSSH2Types(getHashAlgo()); log.debug("Client: '" + new String(clientversion, "ISO-8859-1") + "'"); log.debug("Server: '" + new String(serverversion, "ISO-8859-1") + "'"); hash.updateByteString(clientversion); hash.updateByteString(serverversion); hash.updateByteString(clientKexPayload); hash.updateByteString(serverKexPayload); hash.updateByteString(hostKey); hash.updateByteString(getE()); hash.updateByteString(getServerE()); hash.updateBigInt(sharedSecret); return hash.getDigest(); } public abstract String getHashAlgo(); }