Generate Key ,iv ,Token

Question

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!......

Rajkiran Swain · 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); } } }

Rajkiran Swain · Answer

// 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);

Tarun · Answer

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 !......

Tarun · Answer

How to Generating iv only Numbers in C# Please Help me Fast !.......

Tarun · Answer

sir i want in asp.net C# not java please help me fast !..........

Rajkiran Swain · Answer

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; } }

Tarun · Answer

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 ! ..................