/// <summary>
/// Initiates the asynchronous SRP authentication flow
/// </summary>
/// <param name="srpRequest">InitiateSrpAuthRequest object containing the necessary parameters to
/// create an InitiateAuthAsync API call for SRP authentication</param>
/// <returns>Returns the AuthFlowResponse object that can be used to respond to the next challenge,
/// if one exists</returns>
public async Task <AuthFlowResponse> StartWithSrpAuthAsync(InitiateSrpAuthRequest srpRequest)
{
if (srpRequest == null || string.IsNullOrEmpty(srpRequest.Password))
{
throw new ArgumentNullException("Password required for authentication.", "srpRequest");
}
Tuple <BigInteger, BigInteger> tupleAa = AuthenticationHelper.CreateAaTuple();
InitiateAuthRequest initiateRequest = CreateSrpAuthRequest(tupleAa);
InitiateAuthResponse initiateResponse = await Provider.InitiateAuthAsync(initiateRequest).ConfigureAwait(false);
UpdateUsernameAndSecretHash(initiateResponse.ChallengeParameters);
RespondToAuthChallengeRequest challengeRequest =
CreateSrpPasswordVerifierAuthRequest(initiateResponse, srpRequest.Password, tupleAa);
RespondToAuthChallengeResponse verifierResponse =
await Provider.RespondToAuthChallengeAsync(challengeRequest).ConfigureAwait(false);
UpdateSessionIfAuthenticationComplete(verifierResponse.ChallengeName, verifierResponse.AuthenticationResult);
return(new AuthFlowResponse()
{
SessionID = verifierResponse.Session,
ChallengeName = verifierResponse.ChallengeName,
AuthenticationResult = verifierResponse.AuthenticationResult,
ChallengeParameters = verifierResponse.ChallengeParameters,
ClientMetadata = new Dictionary <string, string>(verifierResponse.ResponseMetadata.Metadata)
});
}
/// <summary>
/// Initiates the asynchronous SRP authentication flow
/// </summary>
/// <param name="srpRequest">InitiateSrpAuthRequest object containing the necessary parameters to
/// create an InitiateAuthAsync API call for SRP authentication</param>
/// <returns>Returns the AuthFlowResponse object that can be used to respond to the next challenge,
/// if one exists</returns>
public void StartWithSrpAuthAsync(InitiateSrpAuthRequest srpRequest, AsyncCallback <AuthFlowResponse> callback = null)
{
if (srpRequest == null || string.IsNullOrEmpty(srpRequest.Password))
{
throw new ArgumentNullException("Password required for authentication.", "srpRequest");
}
Tuple <BigInteger, BigInteger> tupleAa = AuthenticationHelper.CreateAaTuple();
InitiateAuthRequest initiateRequest = CreateSrpAuthRequest(tupleAa);
Provider.InitiateAuthAsync(initiateRequest, initResult =>
{
if (initResult.Exception != null)
{
callback?.Invoke(new AsyncResult <AuthFlowResponse>(null, initResult.Exception));
return;
}
UpdateUsernameAndSecretHash(initResult.Response.ChallengeParameters);
RespondToAuthChallengeRequest challengeRequest =
CreateSrpPasswordVerifierAuthRequest(initResult.Response, srpRequest.Password, tupleAa);
bool challengeResponsesValid = challengeRequest != null && challengeRequest.ChallengeResponses != null;
bool deviceKeyValid = Device != null && !string.IsNullOrEmpty(Device.DeviceKey);
if (challengeResponsesValid && deviceKeyValid)
{
challengeRequest.ChallengeResponses.Add(CognitoConstants.ChlgParamDeviceKey, Device.DeviceKey);
}
Provider.RespondToAuthChallengeAsync(challengeRequest, respondResult =>
{
if (respondResult.Exception != null)
{
callback?.Invoke(new AsyncResult <AuthFlowResponse>(null, respondResult.Exception));
return;
}
RespondToAuthChallengeResponse verifierResponse = respondResult.Response;
UpdateSessionIfAuthenticationComplete(verifierResponse.ChallengeName, verifierResponse.AuthenticationResult);
callback?.Invoke(new AsyncResult <AuthFlowResponse>(new AuthFlowResponse()
{
SessionID = verifierResponse.Session,
ChallengeName = verifierResponse.ChallengeName,
AuthenticationResult = verifierResponse.AuthenticationResult,
ChallengeParameters = verifierResponse.ChallengeParameters,
ClientMetadata = new Dictionary <string, string>(verifierResponse.ResponseMetadata.Metadata)
}, null));
});
});
}
/// <summary>
/// Initiates the asynchronous SRP authentication flow
/// </summary>
/// <param name="srpRequest">InitiateSrpAuthRequest object containing the necessary parameters to
/// create an InitiateAuthAsync API call for SRP authentication</param>
/// <returns>Returns the AuthFlowResponse object that can be used to respond to the next challenge,
/// if one exists</returns>
public async Task <AuthFlowResponse> StartWithSrpAuthAsync(InitiateSrpAuthRequest srpRequest)
{
if (srpRequest == null || string.IsNullOrEmpty(srpRequest.Password))
{
throw new ArgumentNullException("Password required for authentication.", "srpRequest");
}
Tuple <BigInteger, BigInteger> tupleAa = AuthenticationHelper.CreateAaTuple();
InitiateAuthRequest initiateRequest = CreateSrpAuthRequest(tupleAa);
InitiateAuthResponse initiateResponse = await Provider.InitiateAuthAsync(initiateRequest).ConfigureAwait(false);
UpdateUsernameAndSecretHash(initiateResponse.ChallengeParameters);
RespondToAuthChallengeRequest challengeRequest =
CreateSrpPasswordVerifierAuthRequest(initiateResponse, srpRequest.Password, tupleAa);
bool challengeResponsesValid = challengeRequest != null && challengeRequest.ChallengeResponses != null;
bool deviceKeyValid = Device != null && !string.IsNullOrEmpty(Device.DeviceKey);
if (challengeResponsesValid && deviceKeyValid)
{
challengeRequest.ChallengeResponses.Add(CognitoConstants.ChlgParamDeviceKey, Device.DeviceKey);
}
RespondToAuthChallengeResponse verifierResponse =
await Provider.RespondToAuthChallengeAsync(challengeRequest).ConfigureAwait(false);
UpdateSessionIfAuthenticationComplete(verifierResponse.ChallengeName, verifierResponse.AuthenticationResult);
return(new AuthFlowResponse(verifierResponse.Session,
verifierResponse.AuthenticationResult,
verifierResponse.ChallengeName,
verifierResponse.ChallengeParameters,
new Dictionary <string, string>(verifierResponse.ResponseMetadata.Metadata)));
}