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Validate client certificate (given by the WS provider to us) to make a call to the Ext. WS from SF



I need to make a call to one of the webServices. In order to authenticate to this webService, there are two steps involved,

1. Make a call to this other service, which will return some information back, which needs to be authenticated

2. Also, once the first service returns back with the information, we need o use this to validate the certificate which have given to us. Then call another service, with these information (I am not very clear on this)


My main question here is, how can we validate their certificate. In order to that, would we not require to have this service installed on the server (which would Salesforce). This is not possible. So is there some other way to read this certificate into some kind of object and then send the validation.


Any help is appreciated in this issue.