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- /*
- * Copyright (C) 2015, Matthias Sohn <matthias.sohn@sap.com>
- * and other copyright owners as documented in the project's IP log.
- *
- * This program and the accompanying materials are made available
- * under the terms of the Eclipse Distribution License v1.0 which
- * accompanies this distribution, is reproduced below, and is
- * available at http://www.eclipse.org/org/documents/edl-v10.php
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or
- * without modification, are permitted provided that the following
- * conditions are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials provided
- * with the distribution.
- *
- * - Neither the name of the Eclipse Foundation, Inc. nor the
- * names of its contributors may be used to endorse or promote
- * products derived from this software without specific prior
- * written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
- * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
- package org.eclipse.jgit.lfs.lib;
-
- import java.security.MessageDigest;
- import java.security.NoSuchAlgorithmException;
- import java.text.MessageFormat;
-
- import org.eclipse.jgit.lfs.internal.LfsText;
-
- /**
- * Misc. constants used throughout JGit LFS extension.
- *
- * @since 4.3
- **/
- @SuppressWarnings("nls")
- public final class Constants {
- /** Hash function used natively by Git LFS extension for large objects. */
- private static final String LONG_HASH_FUNCTION = "SHA-256";
-
- /**
- * A Git LFS large object hash is 256 bits, i.e. 32 bytes.
- * <p>
- * Changing this assumption is not going to be as easy as changing this
- * declaration.
- */
- public static final int LONG_OBJECT_ID_LENGTH = 32;
-
- /**
- * A Git LFS large object can be expressed as a 64 character string of
- * hexadecimal digits.
- *
- * @see #LONG_OBJECT_ID_LENGTH
- */
- public static final int LONG_OBJECT_ID_STRING_LENGTH = LONG_OBJECT_ID_LENGTH
- * 2;
-
- /**
- * Create a new digest function for objects.
- *
- * @return a new digest object.
- * @throws RuntimeException
- * this Java virtual machine does not support the required hash
- * function. Very unlikely given that JGit uses a hash function
- * that is in the Java reference specification.
- */
- public static MessageDigest newMessageDigest() {
- try {
- return MessageDigest.getInstance(LONG_HASH_FUNCTION);
- } catch (NoSuchAlgorithmException nsae) {
- throw new RuntimeException(MessageFormat.format(
- LfsText.get().requiredHashFunctionNotAvailable,
- LONG_HASH_FUNCTION), nsae);
- }
- }
-
- static {
- if (LONG_OBJECT_ID_LENGTH != newMessageDigest().getDigestLength())
- throw new LinkageError(
- LfsText.get().incorrectLONG_OBJECT_ID_LENGTH);
- }
- }
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