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author | Kenny Root <kenny@the-b.org> | 2015-07-18 11:30:18 -0700 |
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committer | Kenny Root <kenny@the-b.org> | 2015-07-18 11:30:18 -0700 |
commit | 2f5f3754dce85212a71138fd80c2300b73461908 (patch) | |
tree | ac51a1c9f143bc77a0cfec2e7da1b7c184394a98 /sshlib/src/main/java/com/trilead/ssh2/crypto/dh/GenericDhExchange.java | |
parent | 0cf7ac30faecc82e04b080f418b08758624b07f5 (diff) | |
download | sshlib-2f5f3754dce85212a71138fd80c2300b73461908.tar.gz sshlib-2f5f3754dce85212a71138fd80c2300b73461908.tar.bz2 sshlib-2f5f3754dce85212a71138fd80c2300b73461908.zip |
Rename project to sshlib
Diffstat (limited to 'sshlib/src/main/java/com/trilead/ssh2/crypto/dh/GenericDhExchange.java')
-rw-r--r-- | sshlib/src/main/java/com/trilead/ssh2/crypto/dh/GenericDhExchange.java | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/sshlib/src/main/java/com/trilead/ssh2/crypto/dh/GenericDhExchange.java b/sshlib/src/main/java/com/trilead/ssh2/crypto/dh/GenericDhExchange.java new file mode 100644 index 0000000..039ff75 --- /dev/null +++ b/sshlib/src/main/java/com/trilead/ssh2/crypto/dh/GenericDhExchange.java @@ -0,0 +1,93 @@ + +package com.trilead.ssh2.crypto.dh; + +import java.io.IOException; +import java.io.UnsupportedEncodingException; +import java.math.BigInteger; + +import com.trilead.ssh2.crypto.digest.HashForSSH2Types; +import com.trilead.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(); + + /** + * @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 abstract void setF(byte[] f) throws IOException; + + public byte[] calculateH(byte[] clientversion, byte[] serverversion, byte[] clientKexPayload, + byte[] serverKexPayload, byte[] hostKey) throws UnsupportedEncodingException + { + HashForSSH2Types hash = new HashForSSH2Types(getHashAlgo()); + + if (log.isEnabled()) + { + log.log(90, "Client: '" + new String(clientversion, "ISO-8859-1") + "'"); + log.log(90, "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(); +} |