/// <summary>
/// Gets the decrypted password using the RSA private key which can be found in the
/// PEM file for the key pair.
/// </summary>
/// <param name="rsaPrivateKey">The RSA private key from the PEM file</param>
/// <returns>The decrypted password</returns>
public string GetDecryptedPassword(string rsaPrivateKey)
{
RSAParameters rsaParams;
try
{
rsaParams = new PemReader(new StringReader(rsaPrivateKey.Trim())).ReadPrivatekey();
}
catch (Exception e)
{
throw new AmazonEC2Exception("Invalid RSA Private Key", e);
}
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
rsa.ImportParameters(rsaParams);
byte[] encryptedBytes = Convert.FromBase64String(this.PasswordData);
var decryptedBytes = rsa.Decrypt(encryptedBytes, false);
string decrypted = Encoding.UTF8.GetString(decryptedBytes);
return decrypted;
}
private X509Certificate2 GetX509Certificate()
{
lock (certificateCache)
{
if (certificateCache.ContainsKey(this.SigningCertURL))
{
return certificateCache[this.SigningCertURL];
}
else
{
for (int retries = 1; retries <= MAX_RETRIES; retries++)
{
try
{
HttpWebRequest request = HttpWebRequest.Create(this.SigningCertURL) as HttpWebRequest;
using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
using (var reader = new StreamReader(response.GetResponseStream()))
{
var content = reader.ReadToEnd().Trim();
var pemObject = new PemReader(new StringReader(content)).ReadPemObject();
X509Certificate2 certificate = new X509Certificate2(pemObject.Content);
certificateCache[this.SigningCertURL] = certificate;
return certificate;
}
}
catch(Exception e)
{
if (retries == MAX_RETRIES)
throw new AmazonClientException(string.Format(CultureInfo.InvariantCulture,
"Unable to download signing cert after {0} retries", MAX_RETRIES), e);
else
AWSSDKUtils.Sleep((int)(Math.Pow(4, retries) * 100));
}
}
}
throw new AmazonClientException(string.Format(CultureInfo.InvariantCulture,
"Unable to download signing cert after {0} retries", MAX_RETRIES));
}
}
internal static RSAParameters ConvertPEMToRSAParameters(TextReader privateKeyReader)
{
RSAParameters rsaParams;
try
{
rsaParams = new PemReader(privateKeyReader).ReadPrivatekey();
}
catch (Exception e)
{
throw new AmazonClientException("Invalid RSA Private Key", e);
}
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
rsa.ImportParameters(rsaParams);
return rsaParams;
}
