Remove use of org.bouncycastle.util.encoders.Hex

Change-Id: I5c1ed0397ef99eb5d4f120da331b66c2d0f1707a
Signed-off-by: Michael Dardis <git@md-5.net>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit.test/META-INF/MANIFEST.MF

@@ -18,7 +18,6 @@ Import-Package: com.googlecode.javaewah;version="[1.1.6,2.0.0)",
  org.apache.commons.compress.compressors.gzip;version="[1.15.0,2.0)",
  org.apache.commons.compress.compressors.xz;version="[1.15.0,2.0)",
  org.assertj.core.api;version="[3.14.0,4.0.0)",
- org.bouncycastle.util.encoders;version="[1.61.0,2.0.0)",
  org.eclipse.jgit.annotations;version="[5.7.0,5.8.0)",
  org.eclipse.jgit.api;version="[5.7.0,5.8.0)",
  org.eclipse.jgit.api.errors;version="[5.7.0,5.8.0)",

org.eclipse.jgit.test/tst/org/eclipse/jgit/util/HexTest.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2010, Google Inc.
+ * Copyright (C) 2020 Michael Dardis and others
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Distribution License v. 1.0 which is available at
+ * https://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+package org.eclipse.jgit.util;
+
+import static org.eclipse.jgit.util.Hex.decode;
+import static org.eclipse.jgit.util.Hex.toHexString;
+import static org.junit.Assert.assertEquals;
+
+import org.eclipse.jgit.junit.JGitTestUtil;
+import org.eclipse.jgit.lib.Constants;
+import org.junit.Test;
+
+public class HexTest {
+	@Test
+	public void testEncode() {
+		assertEquals("68690a", toHexString(b("hi\n")));
+		assertEquals("0001020d0a0971", toHexString(b("\0\1\2\r\n\tq")));
+	}
+
+	@Test
+	public void testDecode() {
+		JGitTestUtil.assertEquals(b("hi\n"), decode("68690a"));
+		JGitTestUtil.assertEquals(b("\0\1\2\r\n\tq"), decode("0001020d0a0971"));
+		JGitTestUtil.assertEquals(b("\u000EB"), decode("0E42"));
+	}
+
+	@Test
+	public void testEncodeMatchesDecode() {
+		String[] testStrings = { "", "cow", "a", "a secret string",
+				"\0\1\2\r\n\t" };
+		for (String e : testStrings) {
+			JGitTestUtil.assertEquals(b(e), decode(toHexString(b(e))));
+		}
+	}
+
+	private static byte[] b(String str) {
+		return Constants.encode(str);
+	}
+
+}

org.eclipse.jgit/src/org/eclipse/jgit/transport/WalkEncryption.java

@@ -34,9 +34,9 @@ import javax.crypto.spec.PBEKeySpec;
 import javax.crypto.spec.PBEParameterSpec;
 import javax.crypto.spec.SecretKeySpec;
 
-import org.bouncycastle.util.encoders.Hex;
 import org.eclipse.jgit.internal.JGitText;
 import org.eclipse.jgit.util.Base64;
+import org.eclipse.jgit.util.Hex;
 
 abstract class WalkEncryption {
 	static final WalkEncryption NONE = new NoEncryption();

org.eclipse.jgit/src/org/eclipse/jgit/util/Hex.java

@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2020, Michael Dardis. and others
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Distribution License v. 1.0 which is available at
+ * https://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+package org.eclipse.jgit.util;
+
+/**
+ * Encodes and decodes to and from hexadecimal notation.
+ *
+ * @since 5.7
+ */
+public final class Hex {
+
+	private static final char[] HEX = "0123456789abcdef".toCharArray(); //$NON-NLS-1$
+
+	/** Defeats instantiation. */
+	private Hex() {
+		// empty
+	}
+
+	/**
+	 * Decode a hexadecimal string to a byte array.
+	 *
+	 * Note this method performs no validation on input content.
+	 *
+	 * @param s hexadecimal string
+	 * @return decoded array
+	 */
+	public static byte[] decode(String s) {
+		int len = s.length();
+		byte[] b = new byte[len / 2];
+
+		for (int i = 0; i < len; i += 2) {
+			b[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4) | Character.digit(s.charAt(i + 1), 16));
+		}
+		return b;
+	}
+
+	/**
+	 * Encode a byte array to a hexadecimal string.
+	 *
+	 * @param b byte array
+	 * @return hexadecimal string
+	 */
+	public static String toHexString(byte[] b) {
+		char[] c = new char[b.length * 2];
+
+		for (int i = 0; i < b.length; i++) {
+			int v = b[i] & 0xFF;
+
+			c[i * 2] = HEX[v >>> 4];
+			c[i * 2 + 1] = HEX[v & 0x0F];
+		}
+
+		return new String(c);
+	}
+}