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(Mono C#) Generate RSA Key and Export to PKCS1 / PKCS8Mono C# example code showing how to generate an RSA public/private key and save to PKCS1 and PKCS8 format files. In a PKCS1 or PKCS8 formatted file, the key is stored in binary ASN.1 format (and ASN.1 is itself written according to DER -- Distinguished Encoding Rules). A PEM file simply contains the binary ASN.1 base64 encoded and delimited by BEGIN/END lines. PKCS1 format files are never encrypted. PKCS8 can be encrypted or unencrypted. Public keys are never encrypted (there is no need). Private keys *should* always be encrypted - unless perhaps the unencrypted private key is obtained and itself stored in some sort of secure place.
// This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. Chilkat.Rsa rsa = new Chilkat.Rsa(); // Generate a 2048-bit key. Chilkat RSA supports // key sizes ranging from 512 bits to 8192 bits. bool success = rsa.GenerateKey(2048); if (success != true) { Debug.WriteLine(rsa.LastErrorText); return; } // Get the public and private key parts: Chilkat.PublicKey pubKey = rsa.ExportPublicKeyObj(); Chilkat.PrivateKey privKey = rsa.ExportPrivateKeyObj(); // Get the public key as a PKCS8 PEM string string pubKeyPem = pubKey.GetPem(false); Debug.WriteLine(pubKeyPem); // Get the public key in PKCS8 format, in a Base64 encoded string. string pubKeyPkcs8Base64 = pubKey.GetEncoded(false,"base64"); Debug.WriteLine(pubKeyPkcs8Base64); // Get the public key in PKCS1 format, in a Base64 encoded string. string pubKeyPkcs1Base64 = pubKey.GetEncoded(true,"base64"); Debug.WriteLine(pubKeyPkcs1Base64); // Get the private key in a PKCS8 PEM string. string privKeyPem = privKey.GetPkcs8Pem(); Debug.WriteLine(privKeyPem); // Get the private key in a PKCS8 encrypted PEM string. string privKeyEncPem = privKey.GetPkcs8EncryptedPem("myPassword"); Debug.WriteLine(privKeyEncPem); // Get the private key in PKCS1 Base64 format string privKeyPkcs1Base64 = privKey.GetPkcs1ENC("base64"); Debug.WriteLine(privKeyPkcs1Base64); // Get the private key in PKCS8 Base64 format string privKeyPkcs8Base64 = privKey.GetPkcs8ENC("base64"); Debug.WriteLine(privKeyPkcs8Base64); // Save to PKCS1 / PKCS8 / PEM files... // Save the public key to PKCS8 binary DER success = pubKey.SaveDerFile(false,"pubKey_pkcs8.der"); // Save the public key to PKCS1 binary DER success = pubKey.SaveDerFile("pubKey_pkcs1.der"); // Save the private key to unencrypted binary PKCS1 DER. // Note: PKCS1 is never found in an encrypted format. success = privKey.SavePkcs1File("privKey_pkcs1.der"); // Save the private key to unencrypted binary PKCS8 success = privKey.SavePkcs8File("privKey_pkcs8.der"); // Save the private key to encrypted binary PKCS8 success = privKey.SavePkcs8EncryptedFile("myPassword","privKey_enc_pkcs8.der"); // Save the private key to unencrypted PKCS8 PEM success = privKey.SavePkcs8PemFile("privKey.pem"); // Save the private key to encrypted PKCS8 PEM success = privKey.SavePkcs8EncryptedPemFile("myPassword","privKey_enc.pem"); |
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