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How to convert  varchar2 value to hex

Posted on 2009-04-01
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Last Modified: 2013-12-19
I use  dbms_obfuscation_toolkit package and create a MD5 hashed checksum of input data, but later on I would like to use the hex number (the MD5) not the unreadable Varchar2 equivalent.
Please get a look at the attachment,
Not Á¥)~!èùb¥íü i but  C1A5298F939E87E8.... etc. that is what I want to get.

create or replace function md5( input varchar2 ) return sys.dbms_obfuscation_toolkit.varchar2_checksum as
begin 
  return sys.dbms_obfuscation_toolkit.md5( input_string => input );
 end;
/
 
SELECT md5('Hi') from dual;

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md5-Hi-hex.png
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Question by:rusdemezale
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4 Comments
 
LVL 74

Accepted Solution

by:
sdstuber earned 300 total points
ID: 24040107
try this...


CREATE OR REPLACE FUNCTION md5(input VARCHAR2)
    RETURN VARCHAR2
AS
    v_temp   DBMS_OBFUSCATION_TOOLKIT.varchar2_checksum;
    v_result VARCHAR2(4000);
BEGIN
    v_temp := sys.DBMS_OBFUSCATION_TOOLKIT.md5(input_string => 'Hi');
 
    FOR i IN 1 .. LENGTH(v_temp)
    LOOP
        v_result := v_result || TO_CHAR(ASCII(SUBSTR(v_temp, i, 1)), 'fmXX');
    END LOOP;
    return v_result;
END;
/

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0
 
LVL 74

Expert Comment

by:sdstuber
ID: 24040174
note if you go to 10g you can use dbms_crypto instead


RAWTOHEX(DBMS_CRYPTO.hash(TO_CLOB('Hi'), DBMS_CRYPTO.hash_md5))

or

RAWTOHEX(DBMS_CRYPTO.hash(utl_raw.cast_to_raw('Hi'), DBMS_CRYPTO.hash_md5))
0
 

Author Closing Comment

by:rusdemezale
ID: 31565330
well done. thx.
I just don't know syntax and api of pl sql well.
0
 
LVL 74

Expert Comment

by:sdstuber
ID: 24040280
why only a B?  what else could I have done to earn the A?
0

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