I've got an
RSA private key in
PEM format, is there a straight forward way to read that from .NET and instantiate an
RSACryptoServiceProvider to decrypt data encrypted with the corresponding public key?
I solved, thanks. In case anyone's interested, bouncycastle did the trick, just took me some time due to lack of knowledge from on my side and documentation. This is the code:
var bytesToDecrypt = Convert.FromBase64String("la0Cz.....D43g=="); // string to decrypt, base64 encoded AsymmetricCipherKeyPair keyPair; using (var reader = File.OpenText(@"c:\myprivatekey.pem")) // file containing RSA PKCS1 private key keyPair = (AsymmetricCipherKeyPair) new PemReader(reader).ReadObject(); var decryptEngine = new Pkcs1Encoding(new RsaEngine()); decryptEngine.Init(false, keyPair.Private); var decrypted = Encoding.UTF8.GetString(decryptEngine.ProcessBlock(bytesToDecrypt, 0, bytesToDecrypt.Length));
With respect to easily importing the RSA private key, without using 3rd party code such as BouncyCastle, I think the answer is "No, not with a PEM of the private key alone."
However, as alluded to above by Simone, you can simply combine the PEM of the private key (*.key) and the certificate file using that key (*.crt) into a *.pfx file which can then be easily imported.
To generate the PFX file from the command line:
openssl pkcs12 -in a.crt -inkey a.key -export -out a.pfx
Then use normally with the .NET certificate class such as:
using System.Security.Cryptography.X509Certificates; X509Certificate2 combinedCertificate = new X509Certificate2(@"C:\path\to\file.pfx");
Now you can follow the example from MSDN for encrypting and decrypting via RSACryptoServiceProvider:
I left out that for decrypting you would need to import using the PFX password and the Exportable flag. (see: BouncyCastle RSAPrivateKey to .NET RSAPrivateKey)
X509KeyStorageFlags flags = X509KeyStorageFlags.Exportable; X509Certificate2 cert = new X509Certificate2("my.pfx", "somepass", flags); RSACryptoServiceProvider rsa = (RSACryptoServiceProvider)cert.PrivateKey; RSAParameters rsaParam = rsa.ExportParameters(true);