DES changes.

                                   [23-Dec-1998] down below; but in later

                                   [23-Dec-1998] down below; but in later

                                   versions, these hyphens are gone.]

                                   versions, these hyphens are gone.]

  *) Change type of various DES function arguments from des_cblock

     (which means, in function argument declarartions, pointer to char)

     to des_cblock * (meaning pointer to array with 8 char elements),

     which allows the compiler to do more typechecking; it was like

     that back in SSLeay, but with lots of ugly casts.

     Introduce new type const_des_cblock.

     [Bodo Moeller]

  *) Reorganise the PKCS#7 library and get rid of some of the more obvious

  *) Reorganise the PKCS#7 library and get rid of some of the more obvious

     problems: find RecipientInfo structure that matches recipient certificate

     problems: find RecipientInfo structure that matches recipient certificate

     and initialise the ASN1 structures properly based on passed cipher.

     and initialise the ASN1 structures properly based on passed cipher.