[PATCH] OAEP support

[Daiki Ueno]

Hi,

The attached patch adds OAEP padding support to libgcrypt.

Here are some notes:

- Before encryption/decryption, it reads necessary parameters from
  `flags'.  For example,

  (data
    (flags oaep hash sha1 label "test")
    (value #11223344556677889900AA#))

  for encryption and,

  (enc-data
    (flags oaep hash sha1 label "test")
    ...)

  for decryption.

- After decryption, it stores the decoded value as a `decoded' token
  instead of `value', unlike other encodings (`raw' and `pkcs1').  This
  is for backward compatibility.  For example,

  (decoded #11223344556677889900AA#)

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Regards,
-- 
Daiki Ueno