public static EncryptorRSAKeys GenerateKeys(int keySize)
{
if (keySize % 2 != 0 || keySize < 512)
{
throw new Exception("Key should be multiple of two and greater than 512.");
}
var response = new EncryptorRSAKeys();
using (var provider = new RSACryptoServiceProvider(keySize))
{
var publicKey = RSAKeyExtensions.ToXmlString(provider, false);
var privateKey = RSAKeyExtensions.ToXmlString(provider, true);
var publicKeyWithSize = IncludeKeyInEncryptionString(publicKey, keySize);
var privateKeyWithSize = IncludeKeyInEncryptionString(privateKey, keySize);
response.PublicKey = publicKeyWithSize;
response.PrivateKey = privateKeyWithSize;
provider.PersistKeyInCsp = false;
provider.Clear();
}
return(response);
}
private static byte[] Encrypt(byte[] data, int keySize, string publicKeyXml)
{
if (data == null || data.Length == 0)
{
throw new ArgumentException("Data are empty", "data");
}
int maxLength = GetMaxDataLength(keySize);
if (data.Length > maxLength)
{
throw new ArgumentException(String.Format("Maximum data length is {0}", maxLength), "data");
}
if (!IsKeySizeValid(keySize))
{
throw new ArgumentException("Key size is not valid", "keySize");
}
if (String.IsNullOrEmpty(publicKeyXml))
{
throw new ArgumentException("Key is null or empty", "publicKeyXml");
}
using (var provider = new RSACryptoServiceProvider(keySize))
{
RSAKeyExtensions.FromXmlString(provider, publicKeyXml);
return(provider.Encrypt(data, _optimalAsymmetricEncryptionPadding));
}
}
private static byte[] Decrypt(byte[] data, int keySize, string publicAndPrivateKeyXml)
{
if (data == null || data.Length == 0)
{
throw new ArgumentException("Data are empty", "data");
}
if (!IsKeySizeValid(keySize))
{
throw new ArgumentException("Key size is not valid", "keySize");
}
if (String.IsNullOrEmpty(publicAndPrivateKeyXml))
{
throw new ArgumentException("Key is null or empty", "publicAndPrivateKeyXml");
}
using (var provider = new RSACryptoServiceProvider(keySize))
{
RSAKeyExtensions.FromXmlString(provider, publicAndPrivateKeyXml);
return(provider.Decrypt(data, _optimalAsymmetricEncryptionPadding));
}
}