[PATCH v4 2/6] lib: ecdsa: Add skeleton to implement ecdsa verification in u-boot

[Alex G. <mr.nuke.me@gmail.com>]

On 4/23/21 11:56 PM, Simon Glass wrote:
> Hi Tom, Alex,
> 
> On Fri, 23 Apr 2021 at 12:47, Tom Rini <trini@konsulko.com> wrote:
>>
>> On Fri, Apr 23, 2021 at 11:55:57AM +1200, Simon Glass wrote:
>>> Hi Alex,
>>>
>>> On Thu, 22 Apr 2021 at 07:30, Alex G. <mr.nuke.me@gmail.com> wrote:
>>>>
>>>> On 4/21/21 2:15 AM, Simon Glass wrote:
>>>>> Hi Alexandru,
>>>>>
>>>>> On Fri, 16 Apr 2021 at 08:07, Alexandru Gagniuc <mr.nuke.me@gmail.com> wrote:
>>>>>>
>>>>>> Prepare the source tree for accepting implementations of the ECDSA
>>>>>> algorithm. This patch deals with the boring aspects of Makefiles and
>>>>>> Kconfig files.
>>>>>>
>>>>>> Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
>>>>>> ---
>>>>>>    include/image.h          | 10 +++++-----
>>>>>>    include/u-boot/rsa.h     |  2 +-
>>>>>>    lib/Kconfig              |  1 +
>>>>>>    lib/Makefile             |  1 +
>>>>>>    lib/ecdsa/Kconfig        | 23 +++++++++++++++++++++++
>>>>>>    lib/ecdsa/Makefile       |  1 +
>>>>>>    lib/ecdsa/ecdsa-verify.c | 13 +++++++++++++
>>>>>>    7 files changed, 45 insertions(+), 6 deletions(-)
>>>>>>    create mode 100644 lib/ecdsa/Kconfig
>>>>>>    create mode 100644 lib/ecdsa/Makefile
>>>>>>    create mode 100644 lib/ecdsa/ecdsa-verify.c
>>>>>
>>>>> Reviewed-by: Simon Glass <sjg@chromium.org>
>>>>>
>>>>> nit below
>>>>>
>>>>>>
>>>>>> diff --git a/include/image.h b/include/image.h
>>>>>> index 3ff3c035a7..9b95f6783b 100644
>>>>>> --- a/include/image.h
>>>>>> +++ b/include/image.h
>>>>>> @@ -1224,20 +1224,20 @@ int calculate_hash(const void *data, int data_len, const char *algo,
>>>>>>    #if defined(USE_HOSTCC)
>>>>>>    # if defined(CONFIG_FIT_SIGNATURE)
>>>>>>    #  define IMAGE_ENABLE_SIGN    1
>>>>>> -#  define IMAGE_ENABLE_VERIFY  1
>>>>>> +#  define IMAGE_ENABLE_VERIFY_RSA      1
>>>>>>    #  define IMAGE_ENABLE_VERIFY_ECDSA    1
>>>>>>    #  define FIT_IMAGE_ENABLE_VERIFY      1
>>>>>>    #  include <openssl/evp.h>
>>>>>>    # else
>>>>>>    #  define IMAGE_ENABLE_SIGN    0
>>>>>> -#  define IMAGE_ENABLE_VERIFY  0
>>>>>> +#  define IMAGE_ENABLE_VERIFY_RSA      0
>>>>>>    # define IMAGE_ENABLE_VERIFY_ECDSA     0
>>>>>>    #  define FIT_IMAGE_ENABLE_VERIFY      0
>>>>>>    # endif
>>>>>>    #else
>>>>>>    # define IMAGE_ENABLE_SIGN     0
>>>>>> -# define IMAGE_ENABLE_VERIFY           CONFIG_IS_ENABLED(RSA_VERIFY)
>>>>>> -# define IMAGE_ENABLE_VERIFY_ECDSA     0
>>>>>> +# define IMAGE_ENABLE_VERIFY_RSA       CONFIG_IS_ENABLED(RSA_VERIFY)
>>>>>> +# define IMAGE_ENABLE_VERIFY_ECDSA     CONFIG_IS_ENABLED(ECDSA_VERIFY)
>>>>>
>>>>> Since we are using Kconfig now, can we drop this IMAGE_... stuff and
>>>>> just use CONFIG_IS_ENABLED() in the code?
>>>>
>>>> CONFIG_IS_ENABLED() doesn't work for host tools.
>>>
>>> I wonder if that and IS_ENABLED() can be fixed?
>>
>> Not super easily?  Some sort of seeing about cleaning up the code we
>> share with userspace would be nice, yes.  But it should also probably
>> means that for the user side of things we always enable a bunch of stuff
>> so that in the end we end up with (nearly) target-agnostic tools.
> 
> (just to be clear, this discussion should not hold up this patch IMO)
> 
> Yes and in fact at present we allow some things to be disabled in
> tools where we probably should not.
> 
> My original question was about CONFIG_IS_ENABLED(). I wonder if it
> doesn't work because the CONFIG is not enabled or because of some
> other reason?

CONFIG_IS_ENABLED() macro isn't available when compiling host tools. I 
suspect nobody implemented it host-side?

Alex