Laboratory 14:15

src/main/java/java2/koz01/lab12/Prog1.java

+package java2.koz01.lab12;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.security.NoSuchAlgorithmException;
+
+import javax.crypto.KeyGenerator;
+import javax.crypto.SecretKey;
+
+import lombok.extern.log4j.Log4j2;
+
+@Log4j2
+public class Prog1 {
+
+	public static void main(String[] args) throws NoSuchAlgorithmException, IOException {
+		KeyGenerator kg = KeyGenerator.getInstance("AES");
+		kg.init(256);
+		SecretKey sk = kg.generateKey();
+		byte[] data = sk.getEncoded();
+
+		Files.write(Paths.get(args[0]), data);
+
+
+	}
+
+}

src/main/java/java2/koz01/lab12/Prog2.java

+package java2.koz01.lab12;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+
+import javax.crypto.Cipher;
+import javax.crypto.CipherOutputStream;
+import javax.crypto.NoSuchPaddingException;
+import javax.crypto.spec.SecretKeySpec;
+
+public class Prog2 {
+	public static void main(String[] args) throws IOException, Throwable, NoSuchPaddingException {
+		byte[] keydata = Files.readAllBytes(Paths.get(args[0]));
+		SecretKeySpec sks = new SecretKeySpec(keydata, "AES");
+
+		Cipher cipher = Cipher.getInstance("AES");
+
+		cipher.init(Cipher.ENCRYPT_MODE, sks);
+
+		try (var os = new CipherOutputStream(Files.newOutputStream(Paths.get(args[2])), cipher)) {
+			Files.copy(Paths.get(args[1]), os);
+		}
+
+	}
+}

src/main/java/java2/koz01/lab12/Prog3.java

+package java2.koz01.lab12;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+
+import javax.crypto.Cipher;
+import javax.crypto.CipherInputStream;
+import javax.crypto.NoSuchPaddingException;
+import javax.crypto.spec.SecretKeySpec;
+
+public class Prog3 {
+	public static void main(String[] args) throws IOException, Throwable, NoSuchPaddingException {
+		byte[] keydata = Files.readAllBytes(Paths.get(args[0]));
+		SecretKeySpec sks = new SecretKeySpec(keydata, "AES");
+
+		Cipher cipher = Cipher.getInstance("AES");
+
+		cipher.init(Cipher.DECRYPT_MODE, sks);
+
+		try (var is = new CipherInputStream(Files.newInputStream(Paths.get(args[1])), cipher)) {
+			Files.copy(is, Paths.get(args[2]));
+		}
+
+	}
+}

src/main/java/java2/koz01/lab12/Prog4.java

+package java2.koz01.lab12;
+
+import java.io.IOException;
+import java.math.BigInteger;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.security.KeyFactory;
+import java.security.KeyPair;
+import java.security.KeyPairGenerator;
+import java.security.NoSuchAlgorithmException;
+import java.security.spec.InvalidKeySpecException;
+import java.security.spec.RSAPrivateKeySpec;
+import java.security.spec.RSAPublicKeySpec;
+
+import lombok.extern.log4j.Log4j2;
+
+@Log4j2
+public class Prog4 {
+	public static void main(String[] args) throws NoSuchAlgorithmException, InvalidKeySpecException, IOException {
+
+		KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
+		kpg.initialize(4096);
+		KeyPair kp = kpg.generateKeyPair();
+		log.info("public: {}", kp.getPublic());
+		log.info("private: {}", kp.getPrivate());
+
+		KeyFactory keyFactory = KeyFactory.getInstance("RSA");
+		
+		RSAPublicKeySpec publicKeySpec = keyFactory.getKeySpec(kp.getPublic(), RSAPublicKeySpec.class);
+		RSAPrivateKeySpec privateKeySpec = keyFactory.getKeySpec(kp.getPrivate(), RSAPrivateKeySpec.class);
+
+		writeKey(args[0] + ".pub", publicKeySpec.getModulus(), publicKeySpec.getPublicExponent());
+		writeKey(args[0] + ".priv", privateKeySpec.getModulus(), privateKeySpec.getPrivateExponent());
+
+	}
+
+	private static void writeKey(String string, BigInteger modulus, BigInteger exponent) throws IOException {
+		StringBuffer sb = new StringBuffer();
+		sb.append(modulus.toString());
+		sb.append("\n");
+		sb.append(exponent.toString());
+		Files.writeString(Paths.get(string), sb.toString());
+	}
+}

src/main/java/java2/koz01/lab12/Prog5.java

+package java2.koz01.lab12;
+
+import java.io.IOException;
+import java.math.BigInteger;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.security.InvalidKeyException;
+import java.security.KeyFactory;
+import java.security.NoSuchAlgorithmException;
+import java.security.PublicKey;
+import java.security.spec.InvalidKeySpecException;
+import java.security.spec.RSAPublicKeySpec;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import javax.crypto.BadPaddingException;
+import javax.crypto.Cipher;
+import javax.crypto.CipherOutputStream;
+import javax.crypto.IllegalBlockSizeException;
+import javax.crypto.KeyGenerator;
+import javax.crypto.NoSuchPaddingException;
+import javax.crypto.SecretKey;
+
+import lombok.extern.log4j.Log4j2;
+
+@Log4j2
+public class Prog5 {
+	public static void main(String[] args)
+			throws IOException, InvalidKeySpecException, NoSuchAlgorithmException, NoSuchPaddingException,
+			InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
+		List<BigInteger> valsPub = readBigInts(args[0] + ".pub");
+
+
+		KeyFactory kf = KeyFactory.getInstance("RSA");
+		PublicKey pk = kf.generatePublic(new RSAPublicKeySpec(valsPub.get(0), valsPub.get(1)));
+
+		log.info("pub: {}", pk);
+
+		KeyGenerator kg = KeyGenerator.getInstance("AES");
+		kg.init(256);
+		SecretKey sk = kg.generateKey();
+		byte[] keyData = sk.getEncoded();
+		Cipher cipherRSA = Cipher.getInstance("RSA");
+		cipherRSA.init(Cipher.ENCRYPT_MODE, pk);
+		byte[] encKey = cipherRSA.doFinal(keyData);
+		Files.write(Paths.get(args[1]), encKey);
+
+		Cipher cipherAES = Cipher.getInstance("AES");
+		cipherAES.init(Cipher.ENCRYPT_MODE, sk);
+		try(var os = new CipherOutputStream(Files.newOutputStream(Paths.get(args[3]) ), cipherAES)) {
+			Files.copy(Paths.get(args[2]), os);
+		}
+	}
+
+	private static List<BigInteger> readBigInts(String string) throws IOException {
+		return Files.readAllLines(Paths.get(string)).stream().map(str -> new BigInteger(str))
+				.collect(Collectors.toList());
+
+	}
+}

src/main/java/java2/koz01/lab12/Prog6.java

+package java2.koz01.lab12;
+
+import java.io.IOException;
+import java.math.BigInteger;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.security.InvalidKeyException;
+import java.security.KeyFactory;
+import java.security.NoSuchAlgorithmException;
+import java.security.PrivateKey;
+import java.security.spec.InvalidKeySpecException;
+import java.security.spec.RSAPrivateKeySpec;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import javax.crypto.BadPaddingException;
+import javax.crypto.Cipher;
+import javax.crypto.CipherOutputStream;
+import javax.crypto.IllegalBlockSizeException;
+import javax.crypto.NoSuchPaddingException;
+import javax.crypto.SecretKey;
+import javax.crypto.spec.SecretKeySpec;
+
+import lombok.extern.log4j.Log4j2;
+
+@Log4j2
+public class Prog6 {
+	public static void main(String[] args)
+			throws IOException, InvalidKeySpecException, NoSuchAlgorithmException, NoSuchPaddingException,
+			InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
+		List<BigInteger> valsPub = readBigInts(args[0] + ".priv");
+
+
+		KeyFactory kf = KeyFactory.getInstance("RSA");
+		PrivateKey pk = kf.generatePrivate(new RSAPrivateKeySpec(valsPub.get(0), valsPub.get(1)));
+
+		log.info("priv: {}", pk);
+
+		byte[] encKey = Files.readAllBytes(Paths.get(args[1]));
+
+		Cipher cipherRSA = Cipher.getInstance("RSA");
+		cipherRSA.init(Cipher.DECRYPT_MODE, pk);
+		byte[] keyData = cipherRSA.doFinal(encKey);
+		SecretKey sk = new SecretKeySpec(keyData, "AES");
+
+		Cipher cipherAES = Cipher.getInstance("AES");
+		cipherAES.init(Cipher.DECRYPT_MODE, sk);
+		try(var os = new CipherOutputStream(Files.newOutputStream(Paths.get(args[3]) ), cipherAES)) {
+			Files.copy(Paths.get(args[2]), os);
+		}
+	}
+
+	private static List<BigInteger> readBigInts(String string) throws IOException {
+		return Files.readAllLines(Paths.get(string)).stream().map(str -> new BigInteger(str))
+				.collect(Collectors.toList());
+
+	}
+}