#### [Abblix\.Oidc\.Server](https://www.abblix.com/en/docs/api/abblix-oidc-server 'index')
### [Abblix\.Oidc\.Server\.Endpoints\.DynamicClientManagement\.Validation](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Endpoints.DynamicClientManagement.Validation 'Abblix\.Oidc\.Server\.Endpoints\.DynamicClientManagement\.Validation')

## BackChannelAuthenticationValidator Class

Validates CIBA\-related metadata \(OpenID Connect Client\-Initiated Backchannel Authentication 1\.0 §4\):
the consistency between `backchannel_token_delivery_mode` and
`backchannel_client_notification_endpoint`, and that
`backchannel_authentication_request_signing_alg` is on the server's supported list\.

```csharp
public class BackChannelAuthenticationValidator : Abblix.Oidc.Server.Endpoints.DynamicClientManagement.Validation.IClientRegistrationContextValidator
```

Inheritance [System\.Object](https://learn.microsoft.com/en-us/dotnet/api/system.object 'System\.Object') → BackChannelAuthenticationValidator

Implements [IClientRegistrationContextValidator](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Endpoints.DynamicClientManagement.Validation.IClientRegistrationContextValidator 'Abblix\.Oidc\.Server\.Endpoints\.DynamicClientManagement\.Validation\.IClientRegistrationContextValidator')
### Constructors

## BackChannelAuthenticationValidator\(IJsonWebTokenValidator\) Constructor {#Abblix.Oidc.Server.Endpoints.DynamicClientManagement.Validation.BackChannelAuthenticationValidator.BackChannelAuthenticationValidator(Abblix.Jwt.IJsonWebTokenValidator)}

Validates CIBA\-related metadata \(OpenID Connect Client\-Initiated Backchannel Authentication 1\.0 §4\):
the consistency between `backchannel_token_delivery_mode` and
`backchannel_client_notification_endpoint`, and that
`backchannel_authentication_request_signing_alg` is on the server's supported list\.

```csharp
public BackChannelAuthenticationValidator(Abblix.Jwt.IJsonWebTokenValidator jwtValidator);
```
#### Parameters

###### `jwtValidator` [IJsonWebTokenValidator](https://www.abblix.com/en/docs/api/abblix-jwt/Abblix.Jwt.IJsonWebTokenValidator 'Abblix\.Jwt\.IJsonWebTokenValidator') {#Abblix.Oidc.Server.Endpoints.DynamicClientManagement.Validation.BackChannelAuthenticationValidator.BackChannelAuthenticationValidator(Abblix.Jwt.IJsonWebTokenValidator).jwtValidator}

Source of supported JWT signing algorithms\.
### Methods

## BackChannelAuthenticationValidator\.ValidateAsync\(ClientRegistrationValidationContext\) Method {#Abblix.Oidc.Server.Endpoints.DynamicClientManagement.Validation.BackChannelAuthenticationValidator.ValidateAsync(Abblix.Oidc.Server.Endpoints.DynamicClientManagement.Validation.ClientRegistrationValidationContext)}

Validates the slice of registration metadata this implementation owns\.
May mutate [ClientRegistrationValidationContext](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Endpoints.DynamicClientManagement.Validation.ClientRegistrationValidationContext 'Abblix\.Oidc\.Server\.Endpoints\.DynamicClientManagement\.Validation\.ClientRegistrationValidationContext') with derived values
\(for example the resolved sector identifier\)\.

```csharp
public System.Threading.Tasks.Task<Abblix.Oidc.Server.Common.OidcError?> ValidateAsync(Abblix.Oidc.Server.Endpoints.DynamicClientManagement.Validation.ClientRegistrationValidationContext context);
```
#### Parameters

###### `context` [ClientRegistrationValidationContext](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Endpoints.DynamicClientManagement.Validation.ClientRegistrationValidationContext 'Abblix\.Oidc\.Server\.Endpoints\.DynamicClientManagement\.Validation\.ClientRegistrationValidationContext') {#Abblix.Oidc.Server.Endpoints.DynamicClientManagement.Validation.BackChannelAuthenticationValidator.ValidateAsync(Abblix.Oidc.Server.Endpoints.DynamicClientManagement.Validation.ClientRegistrationValidationContext).context}

The shared validation context for the current request\.

Implements [ValidateAsync\(ClientRegistrationValidationContext\)](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Endpoints.DynamicClientManagement.Validation.IClientRegistrationContextValidator#Abblix.Oidc.Server.Endpoints.DynamicClientManagement.Validation.IClientRegistrationContextValidator.ValidateAsync(Abblix.Oidc.Server.Endpoints.DynamicClientManagement.Validation.ClientRegistrationValidationContext) 'Abblix\.Oidc\.Server\.Endpoints\.DynamicClientManagement\.Validation\.IClientRegistrationContextValidator\.ValidateAsync\(Abblix\.Oidc\.Server\.Endpoints\.DynamicClientManagement\.Validation\.ClientRegistrationValidationContext\)')

#### Returns
[System\.Threading\.Tasks\.Task&lt;](https://learn.microsoft.com/en-us/dotnet/api/system.threading.tasks.task-1 'System\.Threading\.Tasks\.Task\`1')[OidcError](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Common.OidcError 'Abblix\.Oidc\.Server\.Common\.OidcError')[&gt;](https://learn.microsoft.com/en-us/dotnet/api/system.threading.tasks.task-1 'System\.Threading\.Tasks\.Task\`1')  
An [OidcError](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Common.OidcError 'Abblix\.Oidc\.Server\.Common\.OidcError') describing the rejection, or `null` when valid\.