Questions about the APEX 5 hash functions

I have two questions:

1. the wwv_flow_item.md5 function seems to have changed from 4.2 to 5.0.  It used to produce a hexadecimal string of 32 characters, but now it produces a 128 character string. My guess is that it uses more MD5 hash, but perhaps SHA-3?  Can anyone confirm this?

2. the APEX_UTIL package now has the GET_HASH function.  This function produces a significantly different hash string because it contains arbitrary printable characters, those not just hex. It seems that the hash chains are still 86 characters.  I can't find any explanation for this function.  Should I also use SHA - 3?  The API said to use it like this:

APEX_UTIL. GET_HASH (apex_t_varchar2 ("val1", "val2", "val3"))

My guess is that the apex_t_varchar2 function is to convert the input to an inner type.  If anyone can say more about it?

3. (bonus question) APEX_UTIL API seems to indicate that get_hash function is now the hash function of choice for tasks such as the lost update detection.  Am I reading this right?

Ed Sciore

Hi Ed!

1. you can configure the algorithm of checksum with the instance parameter CHECKSUM_HASH_FUNCTION (for example, on the Security tab of the admin app instance). During installation, we define the most secure algorithm that is supported on the version of your database (SHA-1 on 11 g, SHA-2 on 12 c). Unfortunately, a few settings and existing features had the old MD5 algorithm in their name. Maybe it's a bit misleading that they are not necessarily more using md5, but the alternative of the duplication of functions and give them different names was not ideal, either.

2. the result is base64 encoded instead of a hexadecimal value, because it is more compact. APEX_T_VARCHAR2 is a table of varchar2, not a function.

3 APEX_UTIL. GET_HASH is just a utility function. You can certainly use it for construction of the checksum for the lost update detection.

Kind regards

Christian

Tags: Database

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