Generate MD5 hash string with T-SQL

user_425564 0
Viewed 291500

Is there a way to generate MD5 Hash string of type varchar(32) without using fn_varbintohexstr

SUBSTRING(master.dbo.fn_varbintohexstr(HashBytes('MD5', 'email@dot.com')), 3, 32)

So it could be used inside a view with SCHEMABINDING

sql-server-2008 tsql sql-server
10 Answers
SELECT CONVERT(
      VARCHAR(32),
      HASHBYTES(
                   'MD5',
                   CAST(prescrip.IsExpressExamRX AS VARCHAR(250))
                   + CAST(prescrip.[Description] AS VARCHAR(250))
               ),
      2
  ) MD5_Value;

works for me.

user_63925920

You didn't explicitly say you wanted the string to be hex; if you are open to the more space efficient base 64 string encoding, and you are using SQL Server 2016 or later, here's an alternative:

select SubString(h, 1, 32) from OpenJson(
    (select HashBytes('MD5', 'email@dot.com') h for json path)
) with (h nvarchar(max));

This produces:

9TvQiSDl0lgJ3yVj75xStg==
user_1631700 
declare @hash nvarchar(50)
--declare @hash varchar(50)

set @hash = '1111111-2;20190110143334;001'  -- result a5cd84bfc56e245bbf81210f05b7f65f
declare @value varbinary(max);
set @value = convert(varbinary(max),@hash);


select  
 SUBSTRING(sys.fn_sqlvarbasetostr(HASHBYTES('MD5', '1111111-2;20190110143334;001')),3,32) as 'OK'
,SUBSTRING(sys.fn_sqlvarbasetostr(HASHBYTES('MD5', @hash)),3,32) as 'ERROR_01'
,SUBSTRING(sys.fn_sqlvarbasetostr(HASHBYTES('MD5',convert(varbinary(max),@hash))),3,32) as 'ERROR_02'
,SUBSTRING(sys.fn_sqlvarbasetostr(sys.fn_repl_hash_binary(convert(varbinary(max),@hash))),3,32)
,SUBSTRING(sys.fn_sqlvarbasetostr(master.sys.fn_repl_hash_binary(@value)),3,32)
user_42124930

Again, most solutions doesn´t work properly, this is carefully tested to return unique results over a cobination of 10 different text columns (KEY CHANGE: convert to varchar(X) where x is the maximum lenght of your string < 4000, for longer strings, use other methods):

LOWER(CONVERT(VARCHAR(32), HashBytes('MD5', CONVERT(varchar(4000), EmailAddress)), 2))
user_76817030
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