C Generate Rsa Public Private Key Pair Bouncycastle
| // Here you can find full description: https://thetial.com/rsa-encryption-and-decryption-net-core/ |
| using System; |
| using System.IO; |
| using System.Text; |
| using System.Collections.Generic; |
| using Org.BouncyCastle.Crypto; |
| using Org.BouncyCastle.Crypto.Encodings; |
| using Org.BouncyCastle.Crypto.Engines; |
| using Org.BouncyCastle.OpenSsl; |
| using Org.BouncyCastle.Crypto.Parameters; |
| namespace ConsoleApplication |
| { |
| class Program |
| { |
| static void Main(string[] args) |
| { |
| string plainText = @'Connect with me on linkedin: https://www.linkedin.com/in/dziwoki'; |
| string cihperText = encrypt(plainText); |
| string decryptedCipherText = decrypt(cihperText); |
| Console.WriteLine('Encrypted text: {0}', cihperText); |
| Console.WriteLine('Decrypted text {0}. Encryption/Decryption was correct {1}', |
| decryptedCipherText, (plainText decryptedCipherText).ToString()); |
| } |
| static string encrypt(string plainText) { |
| byte[] plainTextBytes = Encoding.UTF8.GetBytes(plainText); |
| PemReader pr = new PemReader( |
| (StreamReader)File.OpenText('./pem_public.pem') |
| ); |
| RsaKeyParameters keys = (RsaKeyParameters)pr.ReadObject(); |
| // Pure mathematical RSA implementation |
| // RsaEngine eng = new RsaEngine(); |
| // PKCS1 v1.5 paddings |
| // Pkcs1Encoding eng = new Pkcs1Encoding(new RsaEngine()); |
| // PKCS1 OAEP paddings |
| OaepEncoding eng = new OaepEncoding(new RsaEngine()); |
| eng.Init(true, keys); |
| int length = plainTextBytes.Length; |
| int blockSize = eng.GetInputBlockSize(); |
| List<byte> cipherTextBytes = new List<byte>(); |
| for (int chunkPosition = 0; |
| chunkPosition < length; |
| chunkPosition += blockSize) |
| { |
| int chunkSize = Math.Min(blockSize, length - chunkPosition); |
| cipherTextBytes.AddRange(eng.ProcessBlock( |
| plainTextBytes, chunkPosition, chunkSize |
| )); |
| } |
| return Convert.ToBase64String(cipherTextBytes.ToArray()); |
| } |
| static string decrypt(string cipherText) { |
| byte[] cipherTextBytes = Convert.FromBase64String(cipherText); |
| PemReader pr = new PemReader( |
| (StreamReader)File.OpenText('./pem_private.pem') |
| ); |
| AsymmetricCipherKeyPair keys = (AsymmetricCipherKeyPair)pr.ReadObject(); |
| // Pure mathematical RSA implementation |
| // RsaEngine eng = new RsaEngine(); |
| // PKCS1 v1.5 paddings |
| // Pkcs1Encoding eng = new Pkcs1Encoding(new RsaEngine()); |
| // PKCS1 OAEP paddings |
| OaepEncoding eng = new OaepEncoding(new RsaEngine()); |
| eng.Init(false, keys.Private); |
| int length = cipherTextBytes.Length; |
| int blockSize = eng.GetInputBlockSize(); |
| List<byte> plainTextBytes = new List<byte>(); |
| for (int chunkPosition = 0; |
| chunkPosition < length; |
| chunkPosition += blockSize) |
| { |
| int chunkSize = Math.Min(blockSize, length - chunkPosition); |
| plainTextBytes.AddRange(eng.ProcessBlock( |
| cipherTextBytes, chunkPosition, chunkSize |
| )); |
| } |
| return Encoding.UTF8.GetString(plainTextBytes.ToArray()); |
| } |
| } |
| } |
commented Jan 29, 2017
Here you can find full description: RSA encryption and decryption with PEM keys in C# |
The purpose of this code is to generate the CSR and the Private Key. The scenario is that we have some clients for whom we run websites and for the SSL component we want to have a page on our site. Bouncy Castle Cryptography Library 1.37 PREV CLASS NEXT CLASS: FRAMES NO FRAMES SUMMARY: NESTED. Public class RSAKeyPairGenerator. An RSA key pair generator. Constructor Summary; RSAKeyPairGenerator Method Summary AsymmetricCipherKeyPair: generateKeyPair. RSA Encryption can be achieved by following the below steps. Select an input message - For demonstration, we select to use a plain text message “Test message” Generate a RSA key pair - The bouncy castle type – RSAKeyPairGenerator has been used for generating the asymmetric key pair.
commented Oct 31, 2018
This is great stuff! Thanks |
commented Mar 28, 2019
If client side uses the above code for RSA Encryption, a math very similar to the one which is written above would be required for RSA Decryption right ? Or some .NET framework classes like RSACryptoServiceProvider can Decrypt as well ? |
commented Jun 18, 2019
Exactly what I've been trying to achieve. Thanks for posting this. |
C Generate Rsa Public Private Key Pair Bouncy Castle Hill
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C Generate Rsa Public Private Key Pair Bouncy Castle In The World
| Uplay cd key generator download. C++ example code showing how to generate an RSA public/private key.
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C Generate Rsa Public Private Key Pair Bouncy Castle 2017
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