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1import org.bouncycastle.jce.provider.BouncyCastleProvider;
2
3import javax.crypto.*;
4import javax.crypto.spec.IvParameterSpec;
5import javax.crypto.spec.SecretKeySpec;
6import java.io.FileInputStream;
7import java.io.FileNotFoundException;
8import java.io.IOException;
9import java.security.*;
10import java.security.cert.CertificateException;
11import java.security.cert.CertificateFactory;
12import java.security.cert.X509Certificate;
13
14public class Server {
15    public static void main(String args[]){
16        //Security.setProperty("crypto.policy", "unlimited");
17
18        /*try {
19            Security.addProvider(new BouncyCastleProvider());
20            CertificateFactory certFactory = CertificateFactory.getInstance("X.509", "BC");
21
22            X509Certificate certificate = (X509Certificate) certFactory.generateCertificate(new FileInputStream("Baeldung.cer"));
23
24            char[] keystorePassword = "password".toCharArray();
25            char[] keyPassword = "password".toCharArray();
26
27            KeyStore keystore = KeyStore.getInstance("PKCS12");
28            keystore.load(new FileInputStream("Baeldung.p12"), keystorePassword);
29            PrivateKey key = (PrivateKey) keystore.getKey("baeldung", keyPassword);
30        }
31        catch (CertificateException e){
32            System.out.println(e);
33        } catch (FileNotFoundException e) {
34            e.printStackTrace();
35        } catch (IOException e) {
36            e.printStackTrace();
37        } catch (UnrecoverableKeyException e) {
38            e.printStackTrace();
39        } catch (NoSuchProviderException e) {
40            e.printStackTrace();
41        } catch (KeyStoreException e) {
42            e.printStackTrace();
43        }*/
44
45        try {
46            byte [] key = {1,2,3,4,1,2,3,4,1,2,3,4,1,2,3,4};
47            SecretKey secretKey = new SecretKeySpec(key, 0, key.length, "AES");
48
49            //nonce
50            byte[] bytesForIV=new byte[16];
51            SecureRandom sr = new SecureRandom();
52            sr.nextBytes(bytesForIV);
53            IvParameterSpec iv = new IvParameterSpec(bytesForIV);
54
55            Cipher c = Cipher.getInstance("AES/CTR/PKCS5Padding");
56        } catch (NoSuchPaddingException e) {
57            e.printStackTrace();
58        } catch (NoSuchAlgorithmException e) {
59            e.printStackTrace();
60        }
61    }
62
63    public byte[] encrypt(byte[] plaintext, Cipher c, SecretKey secretKey, IvParameterSpec iv){
64        byte [] result = null;
65        try {
66            c.init(Cipher.ENCRYPT_MODE, secretKey, iv);
67            result = c.doFinal(plaintext);
68        } catch (InvalidAlgorithmParameterException e) {
69            e.printStackTrace();
70        } catch (InvalidKeyException e) {
71            e.printStackTrace();
72        } catch (BadPaddingException e) {
73            e.printStackTrace();
74        } catch (IllegalBlockSizeException e) {
75            e.printStackTrace();
76        }
77        /*OutputStream ot = out;
78        CipherOutputStream cos = new CipherOutputStream(ot, c);
79        int text;
80        while((text=System.in.read())!=-1){
81            cos.write((byte)text);
82            cos.flush();
83        }*/
84
85        return result;
86    }
87
88    public byte[] decrypt(byte[] ciphertext, Cipher c, SecretKey secretKey, IvParameterSpec iv){
89        byte [] result = null;
90        try {
91            c.init(Cipher.DECRYPT_MODE, secretKey, iv);
92            result = c.doFinal(ciphertext );
93        } catch (InvalidAlgorithmParameterException e) {
94            e.printStackTrace();
95        } catch (InvalidKeyException e) {
96            e.printStackTrace();
97        } catch (BadPaddingException e) {
98            e.printStackTrace();
99        } catch (IllegalBlockSizeException e) {
100            e.printStackTrace();
101        }
102        /*CipherInputStream cis = new CipherInputStream(is, c);
103            int text;
104             while((text=cis.read())!=-1) {
105                 System.out.print((char)text);
106          }*/
107        return result;
108    }
109
110}