Function Module to calculate unique key

Question

Hi All,
I have a situation where my source is 32 char length and destination InfoObject is only 20 char length.  I want to derive a 20 char or less key from 32 char and store it in my InfoObject. The key should be unique to a char sequence.
I should also be able to derive the 32 char from 20 char key generated. Does ABAP have any standard functions which would derive a hash value which is unique and from which you can again derive the original value.
Please help.
Devang.

Answer 1

Hi Deva,
if you can create the uinique key yourself, you can use FM GUID_CREATE: You will get a unique identifier in 16 bytes raw hex  format, 22 character upper/lower case ASCII char format and in 32 character uppercase ASCII format..
They are mutually convertible by FM GUID_CONVERT.
So you can use GUID_CREATE to get the 32 char source key  - you can convert it to a 16 byte hex value for your object.
I don't know if this works as you did not say what it is all about.
Regards
Clemens