Pyspark SQL SHA1 encryption conversion to bigint

Question

I need bigint version of sha1 encrypted text. This is the sha1 converted ouputed,

select upper(sha1('THIsneedstobeChanges'))

output

upper(sha1(CAST(THIsneedstobeChanges AS BINARY)))

0BF3770DF2705F6318491A955D32666395810537

So now I need to convert it to bigint

select cast(upper(sha1('THIsneedstobeChanges')) as bigint)

Output is null. 

Basically I am trying to replicate this code from SQL to spark -SQL,

select cast(HASHBYTES('SHA1', 'testdata') as bigint)

Could you please help with this issue