Generate Key ,iv ,Token

Tarun

3y1.5kASP.NET

TOKEN GENERATE:-

token Token will be passed by signing the constructed plain JSON string with clients Private Key and convert the output to Base64 encoded string using algorithm SHA1withRSA.

KEY GENERATE:-

? key Encrypt generated symmetric key of size 128 bits using banks public key with cipher algorithm Name/ MODE/ Padding for encryption using RSA / ECB / PKCS1Padding and convert the output to Base64 encoded string.

IV GENERATE :-

? iv An un-encoded 16-digit initialization vector to be passed used for encrypting the JSON string

please help me!......

7 Replies

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Rajkiran Swain3y ago

Accepted answer

For generating a token using the RSA algorithm:

using System;
using System.Security.Cryptography;
using System.Text;

namespace TokenGenerator
{
    class Program
    {
        static void Main(string[] args)
        {
            string json = "{\"key1\":\"value1\",\"key2\":\"value2\"}"; // The JSON string to be signed
            string privateKey = ".........
..............."; // The private key used to sign the token

            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            rsa.FromXmlString(privateKey);
            byte[] jsonBytes = Encoding.UTF8.GetBytes(json);
            byte[] signatureBytes = rsa.SignData(jsonBytes, new SHA1CryptoServiceProvider());
            string token = Convert.ToBase64String(signatureBytes);

            Console.WriteLine(token);
        }
    }
}

For generating a key using the RSA algorithm:

using System;
using System.Security.Cryptography;
using System.Text;

namespace KeyGenerator
{
    class Program
    {
        static void Main(string[] args)
        {
            string publicKey = "......"; // The public key used to encrypt the key
            string algorithmName = "AES"; // The symmetric algorithm to be used
            int keySize = 128; // The size of the key in bits
            string cipherModeName = "ECB"; // The cipher mode to be used
            string paddingName = "PKCS1Padding"; // The padding mode to be used

            byte[] keyBytes = new byte[keySize / 8];
            using (RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider())
            {
                rng.GetBytes(keyBytes);
            }

            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            rsa.FromXmlString(publicKey);
            byte[] encryptedKeyBytes = rsa.Encrypt(keyBytes, false);
            string encryptedKey = Convert.ToBase64String(encryptedKeyBytes);

            Console.WriteLine(encryptedKey);
        }
    }
}

For generating an IV:

using System;
using System.Security.Cryptography;

namespace IVGenerator
{
    class Program
    {
        static void Main(string[] args)
        {
            int ivSize = 16; // The size of the IV in bytes

            byte[] ivBytes = new byte[ivSize];
            using (RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider())
            {
                rng.GetBytes(ivBytes);
            }

            string iv = Convert.ToBase64String(ivBytes);

            Console.WriteLine(iv);
        }
    }
}

Tarun3y ago
How To Generate Token With Using of PublicKey and Json String

I am using so many codes but not working .

I am using this code but xmlsting(public key )here i am got error

string json = "{\"key1\":\"value1\",\"key2\":\"value2\"}"; // The JSON string to be signed

string privateKey = "......
...
..............."; // The private key used to sign the token RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();

rsa.FromXmlString(privateKey);

byte[] jsonBytes = Encoding.UTF8.GetBytes(json);

byte[] signatureBytes = rsa.SignData(jsonBytes, new SHA1CryptoServiceProvider());

string token = Convert.ToBase64String(signatureBytes);

Console.WriteLine(token);

help me fast ! ..................
0
Tarun3y ago
string publicKey = "......"; // The public key used to encrypt the key

string algorithmName = "AES"; // The symmetric algorithm to be used

int keySize = 128; // The size of the key in bits

string cipherModeName = "ECB"; // The cipher mode to be used

string paddingName = "PKCS1Padding"; // The padding mode to be used

byte[] keyBytes = new byte[keySize / 8];

using (RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider())

{

rng.GetBytes(keyBytes);

}

RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();

rsa.FromXmlString(publicKey); here error is come that error is(System.Security.XmlSyntaxException: 'Invalid syntax on line 1.)

byte[] encryptedKeyBytes = rsa.Encrypt(keyBytes, false);

string encryptedKey = Convert.ToBase64String(encryptedKeyBytes);

Console.WriteLine(encryptedKey);

please help me fast !......
+1

Rajkiran Swain3y ago

// Create a new instance of the Random class
Random rand = new Random();

// Generate an array of 16 random integers between 0 and 9
int[] ivNumbers = Enumerable.Range(0, 16).Select(i => rand.Next(10)).ToArray();

// Convert the array of integers to a string
string ivString = string.Join("", ivNumbers);

// Display the generated IV
Console.WriteLine("Generated IV: " + ivString);

Tarun3y ago
How to Generating iv only Numbers in C# Please Help me Fast !.......
+1
Tarun3y ago
sir i want in asp.net C# not java please help me fast !..........
+1

Rajkiran Swain3y ago

import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.Signature;
import java.util.Base64;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import org.bouncycastle.jce.provider.BouncyCastleProvider;

public class EncryptionUtils {
    private static final String CIPHER_ALGORITHM = "RSA/ECB/PKCS1Padding";
    private static final String SIGNATURE_ALGORITHM = "SHA1withRSA";
    private static final String RANDOM_ALGORITHM = "SHA1PRNG";
    private static final String KEY_ALGORITHM = "AES";
    private static final int KEY_SIZE = 128;
    private static final int IV_SIZE = 16;

    public static String generateToken(String jsonData, PrivateKey privateKey, PublicKey bankPublicKey) throws Exception {
        Security.addProvider(new BouncyCastleProvider());

        // Generate a random symmetric key
        KeyGenerator keyGen = KeyGenerator.getInstance(KEY_ALGORITHM);
        keyGen.init(KEY_SIZE);
        SecretKey secretKey = keyGen.generateKey();

        // Encrypt the symmetric key with the bank's public key
        Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM, "BC");
        cipher.init(Cipher.ENCRYPT_MODE, bankPublicKey);
        byte[] encryptedKey = cipher.doFinal(secretKey.getEncoded());

        // Encode the encrypted key to Base64 format
        String encodedKey = Base64.getEncoder().encodeToString(encryptedKey);

        // Generate a random initialization vector
        SecureRandom random = SecureRandom.getInstance(RANDOM_ALGORITHM);
        byte[] ivBytes = new byte[IV_SIZE];
        random.nextBytes(ivBytes);
        IvParameterSpec iv = new IvParameterSpec(ivBytes);

        // Encode the IV to Base64 format
        String encodedIV = Base64.getEncoder().encodeToString(iv.getIV());

        // Sign the plain JSON data with the client's private key
        Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
        signature.initSign(privateKey);
        signature.update(jsonData.getBytes("UTF-8"));
        byte[] signatureBytes = signature.sign();

        // Encode the signature to Base64 format
        String encodedSignature = Base64.getEncoder().encodeToString(signatureBytes);

        // Combine the encoded encrypted key, encoded IV, and encoded signature to create the token
        String token = encodedKey + "." + encodedIV + "." + encodedSignature;
        return token;
    }
}