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// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
/* +=======================================================================
 * |
 * |      PlantUML : a free UML diagram generator
 * |
 * +=======================================================================
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 * (C) Copyright 2009-2024, Arnaud Roques
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 * Project Info:  https://plantuml.com
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 * If you like this project or if you find it useful, you can support us at:
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 *
 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the Apache Software License.
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 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
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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.
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 * 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 APACHE license.
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 * The generated images can then be used without any reference to the APACHE license.
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 * although this will be appreciated by the PlantUML team.
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 * There is an exception : if the textual description in PlantUML language is also covered
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 * You have to install GraphViz and to setup the GRAPHVIZ_DOT environment variable
 * (see https://plantuml.com/graphviz-dot )
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 * Icons provided by OpenIconic :  https://useiconic.com/open
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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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