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Add stronger algorithms for message authentication and key exchange.
SHA-2 from JCE was used to add support for - message authentication - hmac-sha2-256 - hmac-sha2-512 - key exchange as described in https://tools.ietf.org/html/rfc3526 - diffie-hellman-group14-sha256 - diffie-hellman-group16-sha512 - diffie-hellman-group18-sha512
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‎.gitignore‎

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.gradle
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build

‎HISTORY.txt‎

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Release Notes:
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==============
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build263 2020-07-20
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- Add gradle build.
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- Add OSGi support.
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- Message authentication: add support for hmac-sha2-256 and hmac-sha2-512.
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- Key exchange: add support for diffie-hellman-group14-sha256, diffie-hellman-group16-sha512 and diffie-hellman-group18-sha512.
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build261, 2013-08-09
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- Joint work by Christian Plattner and David Kocher.

‎README.txt‎

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This repository is forked from one of the automatic exports of code.google.com/p/ganymed-ssh-2 and contains updates on top of the ganymed-ssh2-262 tag. The ganymed-ssh2-262 tag was used to produce the latest public build in Maven Central, which is version 262, so builds from this repository should be version 263. The latest public build in Maven Central is available at https://search.maven.org/artifact/ch.ethz.ganymed/ganymed-ssh2/262/jar
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The following features were added in version 263:
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- Gradle build support.
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- OSGi support.
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- Message authentication: support for hmac-sha2-256 and hmac-sha2-512.
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- Key exchange: support for diffie-hellman-group14-sha256, diffie-hellman-group16-sha512, and diffie-hellman-group18-sha512.
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The code from this repository is used in Software AG Command Central and tested using the Command Central continuous integration. However, this code is not officially supported by Software AG.
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**********************************
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This software is provided as-is and without warranty or support. It does not constitute part of the Software AG product suite. Users are free to use, fork and modify it, subject to the license agreement. While Software AG welcomes contributions, we cannot guarantee to include every contribution in the master project.
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**********************************
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Original content:
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Ganymed SSH-2 for Java - build 261
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==================================

‎build.gradle‎

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plugins {
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id 'java-library'
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}
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repositories {
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jcenter()
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}
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dependencies {
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testImplementation 'junit:junit:4.11'
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}
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group = 'ch.ethz.ganymed'
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version = '263'
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description = 'ganymed-ssh2'
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sourceCompatibility = '1.6'
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sourceSets.main.resources.srcDir project.rootDir
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sourceSets.main.resources.includes = [ 'FAQ.html', 'HISTORY.txt', 'LICENSE.txt', 'overview.html', 'README.txt' ]
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java {
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withSourcesJar()
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withJavadocJar()
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}
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javadoc.failOnError = false
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jar {
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manifest {
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attributes(
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'Bundle-Description': 'Ganymed SSH2 Client Library',
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'Bundle-SymbolicName': 'ch.ethz.ssh2.ganymed-ssh2',
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'Bundle-ManifestVersion': '2',
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'Bundle-ActivationPolicy': 'lazy',
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'Bundle-RequiredExecutionEnvironment': 'JavaSE-1.6',
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'Export-Package': 'ch.ethz.ssh2;version=1.0.0,ch.ethz.ssh2.auth;version=1.0.0,ch.ethz.ssh2.channel;version=1.0.0,ch.ethz.ssh2.crypto;version=1.0.0,ch.ethz.ssh2.crypto.cipher;version=1.0.0,ch.ethz.ssh2.crypto.dh;version=1.0.0,ch.ethz.ssh2.crypto.digest;version=1.0.0,ch.ethz.ssh2.log;version=1.0.0,ch.ethz.ssh2.packets;version=1.0.0,ch.ethz.ssh2.server;version=1.0.0,ch.ethz.ssh2.sftp;version=1.0.0,ch.ethz.ssh2.signature;version=1.0.0,ch.ethz.ssh2.transport;version=1.0.0,ch.ethz.ssh2.util;version=1.0.0',
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'Bundle-Version': '1.0.263',
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'Bundle-Name': 'Ganymed SSH2'
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)
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}
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}

‎settings.gradle‎

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rootProject.name = 'ganymed-ssh2'

‎src/main/java/ch/ethz/ssh2/Connection.java‎

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@@ -1215,6 +1215,26 @@ public synchronized void setServerHostKeyAlgorithms(String[] algos) {
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cryptoWishList.serverHostKeyAlgorithms = algos;
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}
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/**
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* Define the set of allowed key exchange methods.
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*
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* @param algos An array of allowed key exchange methods. The following are supported:
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* diffie-hellman-group14-sha256,
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* diffie-hellman-group16-sha512,
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* diffie-hellman-group18-sha512,
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* diffie-hellman-group14-sha1,
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* diffie-hellman-group1-sha1,
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* diffie-hellman-group-exchange-sha1
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*/
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public synchronized void setClientKexAlgorithms(String[] algos) {
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if ((algos == null) || (algos.length == 0)) {
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throw new IllegalArgumentException();
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}
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algos = removeDuplicates(algos);
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KexManager.checkClientKexAlgorithmList(algos);
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cryptoWishList.kexAlgorithms = algos;
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}
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/**
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* Enable/disable TCP_NODELAY (disable/enable Nagle's algorithm) on the underlying socket.
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* <p/>

‎src/main/java/ch/ethz/ssh2/crypto/dh/DhExchange.java‎

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@@ -21,7 +21,7 @@ public class DhExchange
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/* Given by the standard */
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static final BigInteger p1, p14;
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static final BigInteger p1, p14, p16, p18;
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static final BigInteger g;
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BigInteger p;
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BigInteger k;
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private String hashFunction = "SHA1";
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static
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{
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final String p1_string = "17976931348623159077083915679378745319786029604875"
@@ -57,13 +59,62 @@ public class DhExchange
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+ "E3BE39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9DE2BCBF69558171"
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+ "83995497CEA956AE515D2261898FA051015728E5A8AACAA68FFFFFFFFFFFFFFFF";
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final String p16_string = "FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD12902"
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+ "4E088A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F1"
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+ "4374FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7EDEE386B"
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+ "FB5A899FA5AE9F24117C4B1FE649286651ECE45B3DC2007CB8A163BF0598DA48361C55D39"
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+ "A69163FA8FD24CF5F83655D23DCA3AD961C62F356208552BB9ED529077096966D670C354E"
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+ "4ABC9804F1746C08CA18217C32905E462E36CE3BE39E772C180E86039B2783A2EC07A28FB"
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+ "5C55DF06F4C52C9DE2BCBF6955817183995497CEA956AE515D2261898FA051015728E5A8A"
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+ "AAC42DAD33170D04507A33A85521ABDF1CBA64ECFB850458DBEF0A8AEA71575D060C7DB39"
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+ "70F85A6E1E4C7ABF5AE8CDB0933D71E8C94E04A25619DCEE3D2261AD2EE6BF12FFA06D98A"
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+ "0864D87602733EC86A64521F2B18177B200CBBE117577A615D6C770988C0BAD946E208E24"
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+ "FA074E5AB3143DB5BFCE0FD108E4B82D120A92108011A723C12A787E6D788719A10BDBA5B"
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+ "2699C327186AF4E23C1A946834B6150BDA2583E9CA2AD44CE8DBBBC2DB04DE8EF92E8EFC1"
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+ "41FBECAA6287C59474E6BC05D99B2964FA090C3A2233BA186515BE7ED1F612970CEE2D7AF"
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+ "B81BDD762170481CD0069127D5B05AA993B4EA988D8FDDC186FFB7DC90A6C08F4DF435C93"
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+ "4063199FFFFFFFFFFFFFFFF";
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final String p18_string = "FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024"
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+ "E088A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F14"
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+ "374FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7EDEE386BF"
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+ "B5A899FA5AE9F24117C4B1FE649286651ECE45B3DC2007CB8A163BF0598DA48361C55D39A"
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+ "69163FA8FD24CF5F83655D23DCA3AD961C62F356208552BB9ED529077096966D670C354E4"
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+ "ABC9804F1746C08CA18217C32905E462E36CE3BE39E772C180E86039B2783A2EC07A28FB5"
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+ "C55DF06F4C52C9DE2BCBF6955817183995497CEA956AE515D2261898FA051015728E5A8AA"
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+ "AC42DAD33170D04507A33A85521ABDF1CBA64ECFB850458DBEF0A8AEA71575D060C7DB397"
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+ "0F85A6E1E4C7ABF5AE8CDB0933D71E8C94E04A25619DCEE3D2261AD2EE6BF12FFA06D98A0"
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+ "864D87602733EC86A64521F2B18177B200CBBE117577A615D6C770988C0BAD946E208E24F"
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+ "A074E5AB3143DB5BFCE0FD108E4B82D120A92108011A723C12A787E6D788719A10BDBA5B2"
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+ "699C327186AF4E23C1A946834B6150BDA2583E9CA2AD44CE8DBBBC2DB04DE8EF92E8EFC14"
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+ "1FBECAA6287C59474E6BC05D99B2964FA090C3A2233BA186515BE7ED1F612970CEE2D7AFB"
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+ "81BDD762170481CD0069127D5B05AA993B4EA988D8FDDC186FFB7DC90A6C08F4DF435C934"
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+ "02849236C3FAB4D27C7026C1D4DCB2602646DEC9751E763DBA37BDF8FF9406AD9E530EE5D"
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+ "B382F413001AEB06A53ED9027D831179727B0865A8918DA3EDBEBCF9B14ED44CE6CBACED4"
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+ "BB1BDB7F1447E6CC254B332051512BD7AF426FB8F401378CD2BF5983CA01C64B92ECF032E"
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+ "A15D1721D03F482D7CE6E74FEF6D55E702F46980C82B5A84031900B1C9E59E7C97FBEC7E8"
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+ "F323A97A7E36CC88BE0F1D45B7FF585AC54BD407B22B4154AACC8F6D7EBF48E1D814CC5ED"
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+ "20F8037E0A79715EEF29BE32806A1D58BB7C5DA76F550AA3D8A1FBFF0EB19CCB1A313D55C"
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+ "DA56C9EC2EF29632387FE8D76E3C0468043E8F663F4860EE12BF2D5B0B7474D6E694F91E6"
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+ "DBE115974A3926F12FEE5E438777CB6A932DF8CD8BEC4D073B931BA3BC832B68D9DD30074"
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+ "1FA7BF8AFC47ED2576F6936BA424663AAB639C5AE4F5683423B4742BF1C978238F16CBE39"
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+ "D652DE3FDB8BEFC848AD922222E04A4037C0713EB57A81A23F0C73473FC646CEA306B4BCB"
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+ "C8862F8385DDFA9D4B7FA2C087E879683303ED5BDD3A062B3CF5B3A278A66D2A13F83F44F"
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+ "82DDF310EE074AB6A364597E899A0255DC164F31CC50846851DF9AB48195DED7EA1B1D510"
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+ "BD7EE74D73FAF36BC31ECFA268359046F4EB879F924009438B481C6CD7889A002ED5EE382"
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+ "BC9190DA6FC026E479558E4475677E9AA9E3050E2765694DFC81F56E880B96E7160C980DD"
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+ "98EDD3DFFFFFFFFFFFFFFFFF";
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p1 = new BigInteger(p1_string);
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p14 = new BigInteger(p14_string, 16);
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p16 = new BigInteger(p16_string, 16);
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p18 = new BigInteger(p18_string, 16);
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g = new BigInteger("2");
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}
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65-
public DhExchange()
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public DhExchange(String hashFunction)
66116
{
117+
this.hashFunction = hashFunction;
67118
}
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69120
public void clientInit(int group, SecureRandom rnd)
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74125
p = p1;
75126
else if (group == 14)
76127
p = p14;
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else if (group == 16)
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p = p16;
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else if (group == 18)
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p = p18;
77132
else
78133
throw new IllegalArgumentException("Unknown DH group " + group);
79134

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172227
public byte[] calculateH(byte[] clientversion, byte[] serverversion, byte[] clientKexPayload,
173228
byte[] serverKexPayload, byte[] hostKey)
174229
{
175-
HashForSSH2Types hash = new HashForSSH2Types("SHA1");
230+
HashForSSH2Types hash = new HashForSSH2Types(hashFunction);
176231

177232
if (log.isInfoEnabled())
178233
{
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192247
return hash.getDigest();
193248
}
249+
250+
public String getHashFunction()
251+
{
252+
return hashFunction;
253+
}
194254
}

‎src/main/java/ch/ethz/ssh2/crypto/digest/HMAC.java‎

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2121
int size;
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2323
public HMAC(Digest md, byte[] key, int size)
24+
{
25+
this(md, key, size, 64);
26+
}
27+
28+
public HMAC(Digest md, byte[] key, int size, int blocksize)
2429
{
2530
this.md = md;
2631
this.size = size;
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2833
tmp = new byte[md.getDigestLength()];
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30-
final int BLOCKSIZE = 64;
35+
final int BLOCKSIZE = blocksize;
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3237
k_xor_ipad = new byte[BLOCKSIZE];
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k_xor_opad = new byte[BLOCKSIZE];

‎src/main/java/ch/ethz/ssh2/crypto/digest/HashForSSH2Types.java‎

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2424
public HashForSSH2Types(String type)
2525
{
26-
if (type.equals("SHA1"))
26+
if (type.equals("SHA2-512"))
27+
{
28+
md = new SHA2(512);
29+
}
30+
else if (type.equals("SHA2-256"))
31+
{
32+
md = new SHA2(256);
33+
}
34+
else if (type.equals("SHA1"))
2735
{
2836
md = new SHA1();
2937
}

‎src/main/java/ch/ethz/ssh2/crypto/digest/MAC.java‎

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1919
{
2020
/* Higher Priority First */
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22-
return new String[] { "hmac-sha1-96", "hmac-sha1", "hmac-md5-96", "hmac-md5" };
22+
return new String[] { "hmac-sha2-256", "hmac-sha2-512", "hmac-sha1-96", "hmac-sha1", "hmac-md5-96", "hmac-md5" };
2323
}
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2525
public final static void checkMacList(String[] macs)
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3131
public final static int getKeyLen(String type)
3232
{
33+
if (type.equals("hmac-sha2-256"))
34+
return 32;
35+
if (type.equals("hmac-sha2-512"))
36+
return 64;
3337
if (type.equals("hmac-sha1"))
3438
return 20;
3539
if (type.equals("hmac-sha1-96"))
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4448
public MAC(String type, byte[] key)
4549
{
46-
if (type.equals("hmac-sha1"))
50+
if (type.equals("hmac-sha2-256"))
51+
{
52+
mac = new HMAC(new SHA2(256), key, 32);
53+
}
54+
else if (type.equals("hmac-sha2-512"))
55+
{
56+
mac = new HMAC(new SHA2(512), key, 64, 128);
57+
}
58+
else if (type.equals("hmac-sha1"))
4759
{
4860
mac = new HMAC(new SHA1(), key, 20);
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}

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