Is there any hash function in PL/SQL?

Question

I'm looking for a Hash function in PL/SQL, to get the hash of a varchar. I found a package in Oracle 10 called dbms_crypto with a function dbms_crypto.hash and even other package dbms_sqlhash.getHash, however where I called them, I've got a message like it cannot find them...

Does somebody know how can I call them?? Is there any other package?

Here's my code

DECLARE
 l_textToHash VARCHAR2(19) := 'toto123';
 l_ccn_raw RAW(128) := utl_raw.cast_to_raw(l_textToHash);
 l_encrypted_raw RAW(2048);
BEGIN
  dbms_output.put_line('CC:  ' || l_ccn_raw);
  l_encrypted_raw := dbms_crypto.hash(l_ccn_raw, 3);
  dbms_output.put_line('SH1: ' || l_encrypted_raw);
END;
/

Here's the message

Error starting at line 1 in command:
DECLARE
 l_textToHash VARCHAR2(19) := 'toto123';
 l_ccn_raw RAW(128) := utl_raw.cast_to_raw(l_textToHash);
 l_encrypted_raw RAW(2048);
BEGIN
  dbms_output.put_line('CC:  ' || l_ccn_raw);
  l_encrypted_raw := dbms_crypto.hash(l_ccn_raw, 3);
  dbms_output.put_line('SH1: ' || l_encrypted_raw);
END;
Error report:
ORA-06550: line 7, column 22:
PLS-00201: identifier 'DBMS_CRYPTO' must be declared
ORA-06550: line 7, column 3:
PL/SQL: Statement ignored
06550. 00000 -  "line %s, column %s:\n%s"
*Cause:    Usually a PL/SQL compilation error.
*Action:

Thanks!

Answer 1

Make sure that you have the appropriate permissions granted to the user that you are connecting with. Talk to your DBA to add the execute permission on the SYS.DBMS_CRYPTO package.

Oracle provides a nice guide on working with hashed and encrypted data using the oracle database.

If you are on an older version of the database that doesn't support DBMS_CRYPTO, you can also try DBMS_OBFUSCATION_TOOLKIT.

In Oracle 12c you can use the function STANDARD_HASH.

Answer 2

Depending on why you're trying to generate the hash, the built-in function ORA_HASH may be sufficient,

SQL> select ora_hash( 'fuzzy bunny' ) from dual;

ORA_HASH('FUZZYBUNNY')
----------------------
            2519249214

I wouldn't try to use this if you need a cryptographically secure hash function. But if you just need a simple hash, this should be sufficient.