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//Deffie package rsa; import java.math.*; import java.util.*; class DHM{ private static long power(long a, long b, long p) { if (b == 1) return a; else return (((long)Math.pow(a, b)) % p); } DHM() { long P, G, x, a, y, b, ka, kb; P = 23; System.out.println("The value of P:" + P); G = 9; System.out.println("The value of G:" + G); a = 4; System.out.println("The private key a for A :" + a); x = power(G, a, P); b = 3; System.out.println("The private key X for party B :" + b); y = power(G, b, P); ka = power(y, a, P); kb = power(x, b, P); System.out.println("Secret key for the party A is:" + ka); System.out.println("Secret key for the party B is:" + kb); } } public class rsaprg { public static void main(String[] args) { DHM cObj= new DHM(); } } // RSA week 9 program import java.math.*; import java.util.*; class RSA { RSA() { Scanner sc=new Scanner(System.in); int p, q, n, z, d = 0, e, i; // The number to be encrypted and decrypted int msg ; System.out.println(" enter a message as a number from :1-100"); msg=sc.nextInt(); double c; BigInteger msgback; // 1st prime number p p = 17; // 2nd prime number q q = 11; n = p * q; z = (p - 1) * (q - 1); System.out.println("the value of z = " + z); for (e = 2; e < z; e++) { // e is for public key exponent if (gcd(e, z) == 1) { break; } } System.out.println("the value of e = " + e); for (i = 0; i <= z; i++) { int x = 1 + (i * z); // d is for private key exponent if (x % e == 0) { d = x / e; break; } } System.out.println("the value of d = " + d); c = (Math.pow(msg, e)) % n; System.out.println("the input message is : " + msg); System.out.println("Encrypted message is : " + c); // converting int value of n to BigInteger BigInteger N = BigInteger.valueOf(n); // converting float value of c to BigInteger BigInteger C = BigDecimal.valueOf(c).toBigInteger(); msgback = (C.pow(d)).mod(N); System.out.println("Decrypted message is : " + msgback); } static int gcd(int e, int z) { if (e == 0) return z; else return gcd(z % e, e); } } public class Main { public static void main(String[] args) { //System.out.println("Hello World"); RSA rObje=new RSA(); } } //SHA512 package abc.java; import java.math.BigInteger; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.util.Scanner; class SHA512 { public static String encryptThisString(String input) { try { MessageDigest md = MessageDigest.getInstance("SHA-512"); byte[] messageDigest = md.digest(input.getBytes()); BigInteger no = new BigInteger(1, messageDigest); String hashtext = no.toString(16); while (hashtext.length() < 32) { hashtext = "0" + hashtext; } return hashtext; } catch (NoSuchAlgorithmException e) { throw new RuntimeException(e); } } SHA512() { Scanner sc=new Scanner(System.in); System.out.println(" enter text of your choice "); String s=sc.nextLine(); System.out.println("HashCode Generated by SHA-512 for: "); String s1 = "Cryptography Lab"; System.out.println("\n" + s + " : " + encryptThisString(s1)); } } class Main { public static void main(String args[]) { SHA512 obj=new SHA512(); } } //Elliptic Curve import java.util.Scanner; public class EllipticCurve { public static void main(String arg[]) { float x1,y1,x2,y2,x3,y3,m,a,b; Scanner sc= new Scanner(System.in); System.out.println(" enter thee coordiantee of two points"); x1=sc.nextFloat(); y1=sc.nextFloat(); x2=sc.nextFloat(); y2=sc.nextFloat(); a=sc.nextFloat(); if(x1!=x2) { m=(y1-y2)/(x1-x2); x3=m*m-x1-x2; y3=-y1+m*(x1-x3); System.out.print(x3+" "+y3); } else if(y1==-y2) {System.out.println(" identity"); } else if(x1==y1 && y1==y2) {System.out.println(" c==b or c==a"); } else { m=(3*x1*x1+a)/(2*y1); x3=m*m- 2 * x1; y3= -y1+m*(x1-x3); System.out.print(x3+" "+y3); } } } // DES import java.util.*; class keygen{ public static void main(String args[]){ int i; Scanner sc=new Scanner(System.in); int key[]=new int[10]; System.out.println("enteer key number :"); for(i=0;i<key.length;i++){ key[i]=sc.nextInt(); } int p10[]=new int[10]; p10[0]=key[2]; p10[1]=key[4]; p10[2]=key[1]; p10[3]=key[6]; p10[4]=key[3]; p10[5]=key[9]; p10[6]=key[0]; p10[7]=key[8]; p10[8]=key[7]; p10[9]=key[5]; System.out.println("p10 is "); for(int k=0;k<key.length;k++) System.out.print(""+p10[k]); int L11[]=new int[5]; L11[0]=p10[1]; L11[1]=p10[2]; L11[2]=p10[3]; L11[3]=p10[4]; L11[4]=p10[0]; System.out.println("\n "); int L12[]=new int[5]; L12[0]=p10[6]; L12[1]=p10[7]; L12[2]=p10[8]; L12[3]=p10[9]; L12[4]=p10[5]; System.out.println("L11="); for(int j=0;j<L11.length;j++){ System.out.print(""+L11[j]); } System.out.println("\n L12="); for(int j=0;j<L12.length;j++){ System.out.print(""+L12[j]); } System.out.println("\n "); int p81[]=new int[8]; p81[0]=L12[0]; p81[1]=L11[2]; p81[2]=L12[2]; p81[3]=L11[3]; p81[4]=L12[2]; p81[5]=L11[4]; p81[6]=L12[4]; p81[7]=L12[3]; System.out.println("the firstkey is "); for(int j=0;j<p81.length;j++){ System.out.print(""+p81[j]); } System.out.println("\n "); int L21[]=new int[5]; L21[0]=L11[2]; L21[1]=L11[3]; L21[2]=L11[4]; L21[3]=L11[0]; L21[4]=L11[1]; int L22[]=new int[5]; L22[0]=L12[2]; L22[1]=L12[3]; L22[2]=L12[4]; L22[3]=L12[0]; L22[4]=L12[1]; System.out.print("\n L21=="); for(int j=0;j<L21.length;j++){ System.out.print(L21[j]); } System.out.println("\n "); System.out.println("L22=="); for(int j=0;j<L22.length;j++){ System.out.print(L22[j]); } int p82[]=new int[8]; p82[0]=L22[0]; p82[1]=L21[2]; p82[2]=L22[2]; p82[3]=L21[3]; p82[4]=L22[2]; p82[5]=L21[4]; p82[6]=L22[4]; p82[7]=L22[3]; System.out.println(" \n "); System.out.println("\n the second key is P82=="); for(int j=0;j<p82.length;j++){ System.out.print(""+p82[j]); } }} //AES import javax.crypto.Cipher; import javax.crypto.SecretKey; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.IvParameterSpec; import javax.crypto.spec.PBEKeySpec; import javax.crypto.spec.SecretKeySpec; import java.nio.charset.StandardCharsets; import java.security.InvalidAlgorithmParameterException; import java.security.InvalidKeyException; import java.security.NoSuchAlgorithmException; import java.security.spec.InvalidKeySpecException; import java.security.spec.KeySpec; import java.util.Base64; import javax.crypto.BadPaddingException; import javax.crypto.IllegalBlockSizeException; import javax.crypto.NoSuchPaddingException; class AES { /* Private variable declaration */ private static final String SECRET_KEY = "123456789"; private static final String SALTVALUE = "abcdefg"; /* Encryption Method */ public static String encrypt(String strToEncrypt) { try { /* Declare a byte array. */ byte[] iv = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; IvParameterSpec ivspec = new IvParameterSpec(iv); /* Create factory for secret keys. */ SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256"); /* PBEKeySpec class implements KeySpec interface. */ KeySpec spec = new PBEKeySpec(SECRET_KEY.toCharArray(), SALTVALUE.getBytes(), 65536, 256); SecretKey tmp = factory.generateSecret(spec); SecretKeySpec secretKey = new SecretKeySpec(tmp.getEncoded(), "AES"); Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); cipher.init(Cipher.ENCRYPT_MODE, secretKey, ivspec); /* Retruns encrypted value. */ return Base64.getEncoder() .encodeToString(cipher.doFinal(strToEncrypt.getBytes(StandardCharsets.UTF_8))); } catch (InvalidAlgorithmParameterException | InvalidKeyException | NoSuchAlgorithmException | InvalidKeySpecException | BadPaddingException | IllegalBlockSizeException | NoSuchPaddingException e) { System.out.println("Error occured during encryption: " + e.toString()); } return null; } /* Decryption Method */ public static String decrypt(String strToDecrypt) { try { /* Declare a byte array. */ byte[] iv = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; IvParameterSpec ivspec = new IvParameterSpec(iv); /* Create factory for secret keys. */ SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256"); /* PBEKeySpec class implements KeySpec interface. */ KeySpec spec = new PBEKeySpec(SECRET_KEY.toCharArray(), SALTVALUE.getBytes(), 65536, 256); SecretKey tmp = factory.generateSecret(spec); SecretKeySpec secretKey = new SecretKeySpec(tmp.getEncoded(), "AES"); Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING"); cipher.init(Cipher.DECRYPT_MODE, secretKey, ivspec); /* Retruns decrypted value. */ return new String(cipher.doFinal(Base64.getDecoder().decode(strToDecrypt))); } catch (InvalidAlgorithmParameterException | InvalidKeyException | NoSuchAlgorithmException | InvalidKeySpecException | BadPaddingException | IllegalBlockSizeException | NoSuchPaddingException e) { System.out.println("Error occured during decryption: " + e.toString()); } return null; } AES() { /* Message to be encrypted. */ String originalval = "AES Encryption"; /* Call the encrypt() method and store result of encryption. */ String encryptedval = encrypt(originalval); /* Call the decrypt() method and store result of decryption. */ String decryptedval = decrypt(encryptedval); /* Display the original message, encrypted message and decrypted message on the console. */ System.out.println("Original value: " + originalval); System.out.println("Encrypted value: " + encryptedval); System.out.println("Decrypted value: " + decryptedval); } } class Main{ public static void main(String[] args) { AES obj= new AES(); } }
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