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We have a view into a system that uses a value for the unique id that another company we want to share information with will not accept. I was thinking of using an one way encryption hash similar to what is done with passwords. The concern is can the hashing algorithm created output values be guaranteed unique if the inputs are guaranteed unique and the salt is constant?
Answer is yes. Same id input with same salt will always produce same output.
But, if your question is about guaranteeing that outputs will always be unique, the answer is no. There is a very small statistical probability that the hashing will create the same output twice even if the inputs are different and the salt constant.