'Can I see implementation of UDF function in Spark SQL?

As I discovered Spark SQL does not have hashing functions. In order to select specific hashed data I need to use custom/UDF function like this

    sparkSession.udf.register("hashFuncWithSecret", (s: String) => myHashFunction(s, "my_very_secret_key"))

I want "my_very_secret_key" not be exposed and visible from other spark session or elsewhere in UI or other. I wonder if this is possible. Thank you!

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