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(Mono C#) RSA Encrypt and Decrypt StringsMono C# sample code to RSA public-key encrypt and decrypt strings using public and private keys.
// This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. Chilkat.Rsa rsa = new Chilkat.Rsa(); // This example also generates the public and private // keys to be used in the RSA encryption. // Normally, you would generate a key pair once, // and distribute the public key to your partner. // Anything encrypted with the public key can be // decrypted with the private key. The reverse is // also true: anything encrypted using the private // key can be decrypted using the public key. // Generate a 1024-bit key. Chilkat RSA supports // key sizes ranging from 512 bits to 4096 bits. bool success = rsa.GenerateKey(1024); if (success != true) { Debug.WriteLine(rsa.LastErrorText); return; } // Keys are exported in XML format: string publicKey = rsa.ExportPublicKey(); string privateKey = rsa.ExportPrivateKey(); string plainText = "Encrypting and decrypting should be easy!"; // Start with a new RSA object to demonstrate that all we // need are the keys previously exported: Chilkat.Rsa rsaEncryptor = new Chilkat.Rsa(); // Encrypted output is always binary. In this case, we want // to encode the encrypted bytes in a printable string. // Our choices are "hex", "base64", "url", "quoted-printable". rsaEncryptor.EncodingMode = "hex"; // We'll encrypt with the public key and decrypt with the private // key. It's also possible to do the reverse. success = rsaEncryptor.ImportPublicKey(publicKey); bool usePrivateKey = false; string encryptedStr = rsaEncryptor.EncryptStringENC(plainText,usePrivateKey); Debug.WriteLine(encryptedStr); // Now decrypt: Chilkat.Rsa rsaDecryptor = new Chilkat.Rsa(); rsaDecryptor.EncodingMode = "hex"; success = rsaDecryptor.ImportPrivateKey(privateKey); usePrivateKey = true; string decryptedStr = rsaDecryptor.DecryptStringENC(encryptedStr,usePrivateKey); Debug.WriteLine(decryptedStr); |
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