(krb5_c_get_checksum): make type and data argument optional (krb5_c_{encrypt,decrypt}): return "better" error codes for invalid ivec length
(krb5_c_get_checksum): make type and data argument optional
(krb5_c_{encrypt,decrypt}): return "better" error codes for invalid ivec length


git-svn-id: 193148810cf65385f3a195dbc9a8b504846da3a2@12478 ec53bebd-3082-4978-b11e-865c3cabbd6b

madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal