> -----Original Message-----
> From: Stephen Warren [mailto:swar...@wwwdotorg.org]
> Sent: Monday, October 12, 2015 3:49 PM
> To: Jimmy Zhang
> Cc: Allen Martin; Stephen Warren; linux-tegra@vger.kernel.org
> Subject: Re: [cbootimage PATCH v5 1/5] Add support for update pubkey and
> rsa-pss signatures
>
> On 10/09/2015 07:46 PM, Jimmy Zhang wrote:
> > Create new configuration keywords:
> > RsaKeyModulusFile: pubkey modulus
> > RsaPssSigBlFile: bootloader rsa pss signature
> > RsaPssSigBctFile: bct rsa pss signature
> >
> > Sample Configuration file update_bl_sig.cfg
> > RsaKeyModulusFile = pubkey.mod;
> > RsaPssSigBlFile = bl.sig;
> >
> > where pubkey.mod and bl.sig are files that contain the public key
> > modulus and bootloader's rsa-pss signature respectively.
> >
> > public key modulus and signature are created through utilities outside
> > cbootimage.
> >
> > Command line example:
> > $ cbootimage -s tegra210 -u update_bl_sig.cfg image.bin
> > image.bin-bl-signed
> >
> > Above three new keywords added in this CL are only implemented support
> > for T210.
>
> I'd like to see a changelog per patch so I don't have to refer back to the
> cover
> letter each time.
>
OK
> > diff --git a/src/crypto.c b/src/crypto.c
>
> > +void
> > +swap_endianness(
>
> Nit: It's more like "byte order" (serialization) rather than endianness,
> although they're related concepts.
>
This is the function name used by tegrasign. I am open if you have a better
name. The reason for the swap because the string actually is a 256 byte long
number. Tegra soc handles a number by little endian byte order.
> > + u_int8_t *out,
> > + u_int8_t *in,
>
> Nit: You could make "in" const to since it's not written.
>
OK.
> > + const u_int32_t size)
>
> ... certainly that'd be more useful than making size const.
>
> > +{
> > + u_int32_t i;
> > +
> > + for (i = 0; i < size / 2; i++) {
> > + u_int8_t b1 = in[i];
> > + u_int8_t b2 = in[size - 1 - i];
> > + out[i] = b2;
> > + out[size - 1 - i] = b1;
>
> Nit: It'd be nice to put "size - 1 - i" into a variable rather than duplicate
> the
> calculation.
>
> > diff --git a/src/set.c b/src/set.c
>
> > +int
> > +set_rsa_param(build_image_context *context, parse_token token,
> > + char *filename)
> > +{
> > + int result;
> > + u_int8_t *rsa_storage; /* Holds the rsa param after reading */
> > + u_int32_t size; /* Bytes to read */
> > + u_int32_t actual_size; /* In bytes */
> > +
> > + if (g_soc_config->get_value_size == NULL) {
> > + printf("Error: get_value_size() is not supported.\n");
>
> I think code that calls that function should be able to assume the function
> pointer is non-NULL. This could be achieved by either having each SoC-
> specific file provide an implementation of that function. For the SoCs that
> don't support this, you could share a common dummy implementation that
> always returns an error.
>
OK
> > diff --git a/src/parse.h b/src/parse.h
>
> > /*
> > + * Get the size of specified bct field
> > + *
> > + * @param id The parse token
> > + * @param data Return size from bct field
> > + * @param bct Bct pointer
> > + * @return 0 and -ENODATA for success and failure
> > + */
> > + int (*get_value_size)(parse_token id,
> > + void *data,
> > + u_int8_t *bct);
>
> The existing get/set functions use a void* since they can operate on
> different fields with different data types. However, the result of retrieving
> a
> field's size is always a size_t. The "bct" parameter also doesn't seem to be
> used; do you think there could ever be a use for it?
> I think the following prototype should be used so that we can get as much
> type safety as possible:
>
> // Returns >0 for size, -ve for error, never returns 0.
> size_t (*get_value_size)(parse_token id);
OK.
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