DBMS_CRYPTO error

Question

Hi
I have problem using dbms_crypto package.
If I execute this code:
declare
  c_text clob := to_clob('TEST TEXT');
  b_result blob;
  function crypt (ac_text clob) return blob as
     secret_key   RAW (32) := utl_raw.cast_to_raw('12345678901234567890123456789012');
     crypt_type   PLS_INTEGER := DBMS_CRYPTO.ENCRYPT_AES256 + DBMS_CRYPTO.CHAIN_CBC + DBMS_CRYPTO.PAD_PKCS5;
     crypted_text blob;
  BEGIN
     DBMS_CRYPTO.ENCRYPT(crypted_text, ac_text, crypt_type, secret_key, null);
     return crypted_text;
  END crypt;
begin
  b_result := crypt(c_text);
end;
/it would return error:
ORA-01405: fetched column value is NULL
My database is 10.2.0.4 64bit...
Any idea what might be wrong?

Answer 1

I am pasting you real-life application encrypt procedure (slightly modified) that may help you (you will need first to convert your CLOB data to VARCHAR2)
FUNCTION encrypt(text IN VARCHAR2, secretKey IN VARCHAR2) RETURN RAW IS
encryptedText RAW(2000);
BEGIN
encryptedText := DBMS_CRYPTO.ENCRYPT(UTL_I18N.STRING_TO_RAW(text, 'AL32UTF8'), dbms_crypto.AES_CBC_PKCS5, UTL_I18N.STRING_TO_RAW(secretKey));
RETURN encryptedText;
END encrypt;