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Chapter 6 Oracle Encryption

PARAMETER

DESCRIPTION

WHICH  

0 – for double pass and 1 – for triple pass.

IV  

The same as the explanation for IV in the encryption routines, in RAW datatype. The default is a null value.

Table 6.4 Parameters for DES3Decrypt Function for RAW

The parameters are very similar to the ones found in encryption routines. An example of the decryption routine is provided at the beginning of the chapter.

The DESEncrypt and DESDecrypt code segments, available both as functions and procedures and with overloaded parameters using varchar2 and raw datatype, do the same thing as the DES3 counterparts, only do it in one pass, using a 64-bit key. Actually, the 8 bits of the 64 bits are thrown out and only 56 bits are used. Since they use a low length key, they are more amenable to breakage. In addition, the iv and iv_string parameters are not available in these stored codes.

RAW or VARCHAR2

As you have noticed earlier, the functions and procedures have been overloaded with parameters both in RAW and VARCHAR2. Which one should be used?

The use of varchar2 parameters makes it simpler to use; but may prove difficult to use in some situations. From the example given at the beginning of the chapter note that the encrypted data are in special characters which
 

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