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// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
/* +=======================================================================
 * |
 * |      PlantUML : a free UML diagram generator
 * |
 * +=======================================================================
 *
 * (C) Copyright 2009-2024, Arnaud Roques
 *
 * Project Info:  https://plantuml.com
 *
 * If you like this project or if you find it useful, you can support us at:
 *
 * https://plantuml.com/patreon (only 1$ per month!)
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 *
 *
 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License V2.
 *
 * THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS ECLIPSE PUBLIC
 * LICENSE ("AGREEMENT"). [GNU General Public License V2]
 *
 * ANY USE, REPRODUCTION OR DISTRIBUTION OF THE PROGRAM CONSTITUTES
 * RECIPIENT'S ACCEPTANCE OF THIS AGREEMENT.
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 * You may obtain a copy of the License at
 *
 * https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * PlantUML can occasionally display sponsored or advertising messages. Those
 * messages are usually generated on welcome or error images and never on
 * functional diagrams.
 * See https://plantuml.com/professional if you want to remove them
 *
 * Images (whatever their format : PNG, SVG, EPS...) generated by running PlantUML
 * are owned by the author of their corresponding sources code (that is, their
 * textual description in PlantUML language). Those images are not covered by
 * this GPL v2 license.
 *
 * The generated images can then be used without any reference to the GPL v2 license.
 * It is not even necessary to stipulate that they have been generated with PlantUML,
 * although this will be appreciated by the PlantUML team.
 *
 * There is an exception : if the textual description in PlantUML language is also covered
 * by any license, then the generated images are logically covered
 * by the very same license.
 *
 * This is the IGY distribution (Install GraphViz by Yourself).
 * You have to install GraphViz and to setup the GRAPHVIZ_DOT environment variable
 * (see https://plantuml.com/graphviz-dot )
 *
 * Icons provided by OpenIconic :  https://useiconic.com/open
 * Archimate sprites provided by Archi :  http://www.archimatetool.com
 * Stdlib AWS provided by https://github.com/milo-minderbinder/AWS-PlantUML
 * Stdlib Icons provided https://github.com/tupadr3/plantuml-icon-font-sprites
 * ASCIIMathML (c) Peter Jipsen http://www.chapman.edu/~jipsen
 * ASCIIMathML (c) David Lippman http://www.pierce.ctc.edu/dlippman
 * CafeUndZopfli ported by Eugene Klyuchnikov https://github.com/eustas/CafeUndZopfli
 * Brotli (c) by the Brotli Authors https://github.com/google/brotli
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 *
 */
package net.sourceforge.plantuml.utils;

import static java.nio.charset.StandardCharsets.UTF_8;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;

import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;

import net.sourceforge.plantuml.code.AsciiEncoder;
import net.sourceforge.plantuml.log.Logme;
import net.sourceforge.plantuml.security.SFile;

public class SignatureUtils {
	// ::remove file when __HAXE__

	// private static byte[] salting(String pass, byte[] salt) throws
	// NoSuchAlgorithmException, InvalidKeySpecException,
	// UnsupportedEncodingException {
	// final byte[] tmp = salting2(pass, salt);
	// return SignatureUtils.getSHA512raw(tmp);
	// }

	public static synchronized byte[] salting(String pass, byte[] salt)
			throws NoSuchAlgorithmException, InvalidKeySpecException {
		final int iterations = 500;
		final int keyLength = 512;
		final SecretKeyFactory skf = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
		final PBEKeySpec spec = new PBEKeySpec(pass.toCharArray(), salt, iterations, keyLength);
		final SecretKey key = skf.generateSecret(spec);
		final byte[] tmp = key.getEncoded();
		return tmp;
	}

	// ::comment when __CORE__
	public static String getSignature(String s) {
		try {
			final byte[] digest = getMD5raw(s);
			return toString(digest);
		} catch (NoSuchAlgorithmException e) {
			Logme.error(e);
			throw new UnsupportedOperationException(e);
		} catch (UnsupportedEncodingException e) {
			Logme.error(e);
			throw new UnsupportedOperationException(e);
		}
	}

	public static String toString(byte data[]) {
		final AsciiEncoder coder = new AsciiEncoder();
		return coder.encode(data);
	}

	public static String toHexString(byte data[]) {
		final StringBuilder sb = new StringBuilder(data.length * 2);
		for (byte b : data) {
			sb.append(String.format("%02x", b));
		}
		return sb.toString();
	}

	public static String getMD5Hex(String s) {
		try {
			final byte[] digest = getMD5raw(s);
			assert digest.length == 16;
			return toHexString(digest);
		} catch (NoSuchAlgorithmException e) {
			Logme.error(e);
			throw new UnsupportedOperationException(e);
		} catch (UnsupportedEncodingException e) {
			Logme.error(e);
			throw new UnsupportedOperationException(e);
		}
	}

	public static String getSHA512Hex(String s) {
		try {
			final byte[] digest = getSHA512raw(s);
			assert digest.length == 64;
			return toHexString(digest);
		} catch (NoSuchAlgorithmException e) {
			Logme.error(e);
			throw new UnsupportedOperationException(e);
		} catch (UnsupportedEncodingException e) {
			Logme.error(e);
			throw new UnsupportedOperationException(e);
		}
	}

	public static synchronized byte[] getMD5raw(String s)
			throws NoSuchAlgorithmException, UnsupportedEncodingException {
		final MessageDigest msgDigest = MessageDigest.getInstance("MD5");
		msgDigest.update(s.getBytes(UTF_8));
		return msgDigest.digest();
	}

	public static byte[] getSHA512raw(String s) throws NoSuchAlgorithmException, UnsupportedEncodingException {
		return getSHA512raw(s.getBytes(UTF_8));
	}

	public static synchronized byte[] getSHA512raw(byte data[])
			throws NoSuchAlgorithmException, UnsupportedEncodingException {
		final MessageDigest msgDigest = MessageDigest.getInstance("SHA-512");
		msgDigest.update(data);
		return msgDigest.digest();
	}

	// ::comment when __CORE__
	public static String getSignatureSha512(SFile f) throws IOException {
		try (InputStream is = f.openFile()) {
			return getSignatureSha512(is);
		}
	}

	public static synchronized String getSignatureSha512(InputStream is) throws IOException {
		try {
			final MessageDigest msgDigest = MessageDigest.getInstance("SHA-512");
			int read = 0;
			while ((read = is.read()) != -1) {
				msgDigest.update((byte) read);
			}
			final byte[] digest = msgDigest.digest();
			return toString(digest);
		} catch (NoSuchAlgorithmException e) {
			Logme.error(e);
			throw new UnsupportedOperationException(e);
		} catch (UnsupportedEncodingException e) {
			Logme.error(e);
			throw new UnsupportedOperationException(e);
		}
	}

	public static String getSignatureWithoutImgSrc(String s) {
		s = getSignature(purge(s));
		return s;
	}

	public static String purge(String s) {
		final String regex = "(?i)\\";
		s = s.replaceAll(regex, "");
		final String regex2 = "(?i)image=\"(?:[^\"]+[/\\\\])?([^/\\\\\\d.]+)\\d*(\\.\\w+)\"";
		s = s.replaceAll(regex2, "image=\"$1$2\"");
		return s;
	}

	// ::comment when __CORE__
	public static synchronized String getSignature(SFile f) throws IOException {
		try (final InputStream is = f.openFile()) {
			final MessageDigest msgDigest = MessageDigest.getInstance("MD5");
			if (is == null) {
				throw new FileNotFoundException();
			}
			int read = -1;
			while ((read = is.read()) != -1) {
				msgDigest.update((byte) read);
			}
			final byte[] digest = msgDigest.digest();
			return toString(digest);
		} catch (NoSuchAlgorithmException e) {
			Logme.error(e);
			throw new UnsupportedOperationException(e);
		} catch (UnsupportedEncodingException e) {
			Logme.error(e);
			throw new UnsupportedOperationException(e);
		}
	}
}




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