# Hash functions
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A hash function is a mathematical function that converts a numerical input value into another value. 

AWS Clean Rooms Spark SQL supports the following hash functions:

**Topics**
+ [MD5 function](s_MD5.md)
+ [SHA function](s_SHA.md)
+ [SHA1 function](s_SHA1.md)
+ [SHA2 function](s_SHA2.md)
+ [xxHASH64 function](xxhash64.md)