File 0001-Remove-the-dependency-on-google-tink.patch of Package trilead-ssh2

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File 0001-Remove-the-dependency-on-google-tink.patch of Package trilead-ssh2

From 933d197b30e797d4b82eeef1953fd82e617f4cf0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fridrich=20=C5=A0trba?= <fridrich.strba@bluewin.ch>
Date: Wed, 13 Mar 2024 07:05:36 +0100
Subject: [PATCH] Remove the dependency on google tink

---
 .../ssh2/crypto/dh/Curve25519Exchange.java    | 85 -------------------
 .../ssh2/crypto/dh/GenericDhExchange.java     |  3 -
 .../trilead/ssh2/transport/KexManager.java    |  9 +-
 3 files changed, 1 insertion(+), 96 deletions(-)
 delete mode 100644 src/com/trilead/ssh2/crypto/dh/Curve25519Exchange.java

diff --git a/src/com/trilead/ssh2/crypto/dh/Curve25519Exchange.java b/src/com/trilead/ssh2/crypto/dh/Curve25519Exchange.java
deleted file mode 100644
index 01d4ab4..0000000
--- a/src/com/trilead/ssh2/crypto/dh/Curve25519Exchange.java
+++ /dev/null
@@ -1,85 +0,0 @@
-package com.trilead.ssh2.crypto.dh;
-
-import com.google.crypto.tink.subtle.X25519;
-
-import java.io.IOException;
-import java.math.BigInteger;
-import java.security.InvalidKeyException;
-
-/**
- * Created by Kenny Root on 1/23/16.
- */
-public class Curve25519Exchange extends GenericDhExchange {
-	public static final String NAME = "curve25519-sha256";
-	public static final String ALT_NAME = "curve25519-sha256@libssh.org";
-	public static final int KEY_SIZE = 32;
-
-	private byte[] clientPublic;
-	private byte[] clientPrivate;
-	private byte[] serverPublic;
-
-	public Curve25519Exchange() {
-		super();
-	}
-
-	/*
-	 * Used to test known vectors.
-	 */
-	public Curve25519Exchange(byte[] secret) throws InvalidKeyException {
-		if (secret.length != KEY_SIZE) {
-			throw new AssertionError("secret must be key size");
-		}
-		clientPrivate = secret.clone();
-	}
-
-	@Override
-	public void init(String name) throws IOException {
-		if (!NAME.equals(name) && !ALT_NAME.equals(name)) {
-			throw new IOException("Invalid name " + name);
-		}
-
-		clientPrivate = X25519.generatePrivateKey();
-		try {
-			clientPublic = X25519.publicFromPrivate(clientPrivate);
-		} catch (InvalidKeyException e) {
-			throw new IOException(e);
-		}
-	}
-
-	@Override
-	public byte[] getE() {
-		return clientPublic.clone();
-	}
-
-	@Override
-	protected byte[] getServerE() {
-		return serverPublic.clone();
-	}
-
-	@Override
-	public void setF(byte[] f) throws IOException {
-		if (f.length != KEY_SIZE) {
-			throw new IOException("Server sent invalid key length " + f.length + " (expected " +
-					KEY_SIZE + ")");
-		}
-		serverPublic = f.clone();
-		try {
-			byte[] sharedSecretBytes = X25519.computeSharedSecret(clientPrivate, serverPublic);
-			int allBytes = 0;
-			for (int i = 0; i < sharedSecretBytes.length; i++) {
-				allBytes |= sharedSecretBytes[i];
-			}
-			if (allBytes == 0) {
-				throw new IOException("Invalid key computed; all zeroes");
-			}
-			sharedSecret = new BigInteger(1, sharedSecretBytes);
-		} catch (InvalidKeyException e) {
-			throw new IOException(e);
-		}
-	}
-
-	@Override
-	public String getHashAlgo() {
-		return "SHA-256";
-	}
-}
diff --git a/src/com/trilead/ssh2/crypto/dh/GenericDhExchange.java b/src/com/trilead/ssh2/crypto/dh/GenericDhExchange.java
index c2436e3..a63b9fd 100644
--- a/src/com/trilead/ssh2/crypto/dh/GenericDhExchange.java
+++ b/src/com/trilead/ssh2/crypto/dh/GenericDhExchange.java
@@ -29,9 +29,6 @@ public abstract class GenericDhExchange
 	}
 
 	public static GenericDhExchange getInstance(String algo) {
-		if (Curve25519Exchange.NAME.equals(algo) || Curve25519Exchange.ALT_NAME.equals(algo)) {
-			return new Curve25519Exchange();
-		}
 		if (algo.startsWith("ecdh-sha2-")) {
 			return new EcDhExchange();
 		} else {
diff --git a/src/com/trilead/ssh2/transport/KexManager.java b/src/com/trilead/ssh2/transport/KexManager.java
index c2ec2b0..2c8056a 100644
--- a/src/com/trilead/ssh2/transport/KexManager.java
+++ b/src/com/trilead/ssh2/transport/KexManager.java
@@ -17,7 +17,6 @@ import com.trilead.ssh2.crypto.CryptoWishList;
 import com.trilead.ssh2.crypto.KeyMaterial;
 import com.trilead.ssh2.crypto.cipher.BlockCipher;
 import com.trilead.ssh2.crypto.cipher.BlockCipherFactory;
-import com.trilead.ssh2.crypto.dh.Curve25519Exchange;
 import com.trilead.ssh2.crypto.dh.DhGroupExchange;
 import com.trilead.ssh2.crypto.dh.GenericDhExchange;
 import com.trilead.ssh2.crypto.digest.MessageMac;
@@ -397,8 +396,6 @@ public class KexManager implements MessageHandler
 
 			if ("ecdh-sha2-nistp521".equals(algo))
 				continue;
-			if (Curve25519Exchange.NAME.equals(algo)||Curve25519Exchange.ALT_NAME.equals(algo))
-				continue;
 			throw new IllegalArgumentException("Unknown kex algorithm '" + algo + "'");
 		}
 	}
@@ -489,8 +486,6 @@ public class KexManager implements MessageHandler
 			}
 
 			if (kxs.np.kex_algo.equals("diffie-hellman-group1-sha1")
-					|| kxs.np.kex_algo.equals(Curve25519Exchange.NAME)
-					|| kxs.np.kex_algo.equals(Curve25519Exchange.ALT_NAME)
 					|| kxs.np.kex_algo.equals("diffie-hellman-group14-sha1")
 					|| kxs.np.kex_algo.equals("ecdh-sha2-nistp521")
 					|| kxs.np.kex_algo.equals("ecdh-sha2-nistp384")
@@ -630,9 +625,7 @@ public class KexManager implements MessageHandler
 				|| kxs.np.kex_algo.equals("diffie-hellman-group14-sha1")
 				|| kxs.np.kex_algo.equals("ecdh-sha2-nistp256")
 				|| kxs.np.kex_algo.equals("ecdh-sha2-nistp384")
-				|| kxs.np.kex_algo.equals("ecdh-sha2-nistp521")
-				|| kxs.np.kex_algo.equals(Curve25519Exchange.NAME)
-				|| kxs.np.kex_algo.equals(Curve25519Exchange.ALT_NAME))
+				|| kxs.np.kex_algo.equals("ecdh-sha2-nistp521"))
 		{
 			if (kxs.state == 1)
 			{
-- 
2.44.0

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File 0001-Remove-the-dependency-on-google-tink.patch of Package trilead-ssh2

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