sql - Trouble With Encryption in Oracle11g -

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i working on lab attempting encrypt dummy ssn , provide output in sql plus shows unencrypted ssn, encrypted ssn, , decrypted ssn.

the value encrypting 555 55 5555, decrypted value appears 33353335333532303335333532303335333533353335. i'm not quite issue lies, since appears @ least decryption occurring. suggestions appreciated. sql below

set serveroutput on declare    ssn varchar2(200) := '555 55 5555';  ssn_decrypt varchar(200);  ssn_raw raw (200) := utl_raw.cast_to_raw(ssn);  num_key_bytes number := 256/8;  key_bytes_raw raw (32);  encryption_type pls_integer := dbms_crypto.encrypt_aes256  + dbms_crypto.chain_cbc  + dbms_crypto.pad_pkcs5;  encrypted_raw raw (2000);  decrypted_raw raw(2000);    begin     dbms_output.put_line('the unencrypted ssn is: ' || ssn);     key_bytes_raw := dbms_crypto.randombytes (num_key_bytes);     encrypted_raw := dbms_crypto.encrypt          (             utl_i18n.string_to_raw (ssn),              typ => encryption_type,             key => key_bytes_raw         );  decrypted_raw := dbms_crypto.decrypt     (         src => encrypted_raw,         typ => encryption_type,         key => key_bytes_raw     );  ssn_decrypt := utl_i18n.raw_to_char (decrypted_raw, '555 55 5555'); dbms_output.put_line('the encrypted ssn is: ' || rawtohex(utl_raw.cast_to_raw(encrypted_raw)));   dbms_output.put_line('the decrypted ssn is:' ||   rawtohex(utl_raw.cast_to_raw(decrypted_raw))); end; /

the example found dbms_crypto documentation works flawlessly. copy , you'll good.

one issue don't define correct parameters in char vs. raw conversions. should be:

 utl_i18n.string_to_raw(ssn, 'al32utf8')  utl_i18n.raw_to_char(decrypted_raw, 'al32utf8');

note example assumes database character set al32utf8. if not have make conversion too.


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