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Generating custom rainbow table?

PostPosted: Thu Jul 03, 2014 11:42 am
by ays
I'd like to generate a SHA256 rainbow table with all alphanumeric characters for 10-character strings. However, I want to prepend a small string to the beginning of each string, let's say "bob". So I'd like to generate a rainbow table for:

bobaaaaaaaaaa
bobaaaaaaaaab
bobaaaaaaaaac
bobaaaaaaaaad

...and so on.

How can I do this? None of the existing rainbow table generators allows for adding a string to the beginning. Or is there? Or do I need to modify the source of one of the open source ones?