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(C#) Encrypt with Chilkat, Decrypt with OpenSSLDemonstrates how to RSA encrypt a string using Chilkat, and then shows the corresponding OpenSSL command to RSA decrypt. The OpenSSL command to decrypt is as follows: openssl rsautl -decrypt -inkey VP_Private.pem -in rsa_encrypted.bin -out original.txt
// This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. Chilkat.Rsa rsa = new Chilkat.Rsa(); // Note: RSA encryption uses the public key. // RSA decryption uses the private key. // The reason is that the public key can be freely provided to anybody. This allows anybody // to send an encrypted message to the private key owner, and only the private key owner // can decrypt. Chilkat.PublicKey key = new Chilkat.PublicKey(); // Load an RSA public key from a PEM file: bool success = key.LoadFromFile("qa_data/pem/VP_Public.pem"); if (success != true) { Debug.WriteLine(key.LastErrorText); return; } // Load the public key into the RSA object. success = rsa.ImportPublicKeyObj(key); if (success != true) { Debug.WriteLine(rsa.LastErrorText); return; } string strToEncrypt = "00000000;XYZ2-3BHQ-ABCD-MMVV;6MY1-GHJK-9LRR;0"; // The LittleEndian property is false by default, but it is set here // anyway to show that LittleEndian byte ordering is required for OpenSSL compatibility. rsa.LittleEndian = false; bool usePrivateKey = false; byte[] encryptedBytes = null; encryptedBytes = rsa.EncryptString(strToEncrypt,usePrivateKey); if (rsa.LastMethodSuccess != true) { Debug.WriteLine(rsa.LastErrorText); return; } // The OpenSSL command to decrypt would be this: // openssl rsautl -decrypt -inkey VP_Private.pem -in rsa_encrypted.bin -out original.txt Chilkat.FileAccess fac = new Chilkat.FileAccess(); success = fac.WriteEntireFile("qa_output/rsa_encrypted.bin",encryptedBytes); if (success != true) { Debug.WriteLine(fac.LastErrorText); return; } Debug.WriteLine("RSA Encryption Succeeded."); |
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