Figuring out if a cipher mode is available.

[Brad Hards]

I'm trying to use OFB mode with AES and also with DES.  The call:
gcry_cipher_open( &context, GCRY_CIPHER_AES128, GCRY_CIPHER_MODE_OFB, 0 );
fails (works for GCRY_CIPHER_MODE_ECB, _CFB and _CBC).

I see in the code that not all modes are supported for all Ciphers, which is 
fair enough.
That is a problem for me - I can deal with not having OFB support, but I need 
to know earlier. Is there a list of Cipher / mode combinations, or is there 
some call I can use to test for support?

Brad
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