[U-Boot] [PATCH 8/9] [v4] hash: Add function to find hash_algo struct with progressive hash
Ruchika Gupta
ruchika.gupta at freescale.com
Tue Jan 6 10:38:40 CET 2015
Hi Simon,
> -----Original Message-----
> From: sjg at google.com [mailto:sjg at google.com] On Behalf Of Simon Glass
> Sent: Saturday, January 03, 2015 3:54 AM
> To: Gupta Ruchika-R66431
> Cc: U-Boot Mailing List; Sun York-R58495; Wolfgang Denk
> Subject: Re: [PATCH 8/9] [v4] hash: Add function to find hash_algo struct
> with progressive hash
>
> Hi Ruchika,
>
> On 30 December 2014 at 02:30, Ruchika Gupta <ruchika.gupta at freescale.com>
> wrote:
> > The hash_algo structure has some implementations in which progressive
> > hash API's are not defined. These are basically the hardware based
> > implementations of SHA. An API is added to find the algo which has
> > progressive hash API's defined. This can then be integrated with RSA
> > checksum library which uses Progressive Hash API's.
> >
> > Signed-off-by: Ruchika Gupta <ruchika.gupta at freescale.com>
> > CC: Simon Glass <sjg at chromium.org>
> > ---
> > Changes in v4:
> > Few cosmetic changes. Currently I have not replaced CONFIG_SHA1 with
> CONFIG_CMD_SHA1SUM.
> > Waiting for reply from Simon and Denx for the same.
>
> ./tools/buildman/buildman -b try-rsa MPC8308RDB boards.cfg is up to date.
> Nothing to do.
> Building 10 commits for 1 boards (1 thread, 32 jobs per thread)
> 10 0 0 /10 MPC8308RDB
> (try-rsa=458103: asc) u> ./tools/buildman/buildman -b try-rsa MPC8308RDB -sS
> boards.cfg is up to date. Nothing to do.
> Summary of 10 commits for 1 boards (1 thread, 32 jobs per thread)
> 01: Merge branch 'master' of git://git.denx.de/u-boot-usb
> 02: rsa: Split the rsa-verify to separate the modular exponentiation
> 03: FIT: Modify option FIT_SIGNATURE in Kconfig
> 04: DM: crypto/rsa: Add rsa Modular Exponentiation DM driver
> 05: configs: Move CONFIG_FIT_SIGNATURE to defconfig
> 06: lib/rsa: Modify rsa to use DM driver
> 07: DM: crypto/fsl - Add Freescale rsa DM driver
> 08: lib/rsa: Add Kconfig for devices supporting RSA Modular Exponentiation
> 09: hash: Add function to find hash_algo struct with progressive hash
> powerpc: (for 1/1 boards) all +208.0 data +28.0 text +180.0
> 10: rsa: Use checksum algorithms from struct hash_algo (no errors to report)
> (try-rsa=458103: asc) u>
>
> So this adds 180 bytes of code space. I really don't think that is a big
> problem, so I think this patch is fine. I'll Wolfgang chime in if he
> disagrees.
>
> >
> > Changes in v3 :
> > Corrected ifdef for SHA1
> >
> > Changes in v2 :
> > Added commit message
> >
> > common/hash.c | 33 ++++++++++++++++++++++++--------- include/hash.h
> > | 14 ++++++++++++++
> > 2 files changed, 38 insertions(+), 9 deletions(-)
> >
> > diff --git a/common/hash.c b/common/hash.c index 12d6759..ea1ec60
> > 100644
> > --- a/common/hash.c
> > +++ b/common/hash.c
> > @@ -20,7 +20,7 @@
> > #include <asm/io.h>
> > #include <asm/errno.h>
> >
> > -#ifdef CONFIG_CMD_SHA1SUM
> > +#ifdef CONFIG_SHA1
> > static int hash_init_sha1(struct hash_algo *algo, void **ctxp) {
> > sha1_context *ctx = malloc(sizeof(sha1_context)); @@ -125,12
> > +125,7 @@ static struct hash_algo hash_algo[] = {
> > CHUNKSZ_SHA256,
> > },
> > #endif
> > - /*
> > - * This is CONFIG_CMD_SHA1SUM instead of CONFIG_SHA1 since
> otherwise
> > - * it bloats the code for boards which use SHA1 but not the 'hash'
> > - * or 'sha1sum' commands.
> > - */
> > -#ifdef CONFIG_CMD_SHA1SUM
> > +#ifdef CONFIG_SHA1
> > {
> > "sha1",
> > SHA1_SUM_LEN,
> > @@ -140,7 +135,6 @@ static struct hash_algo hash_algo[] = {
> > hash_update_sha1,
> > hash_finish_sha1,
> > },
> > -#define MULTI_HASH
> > #endif
> > #ifdef CONFIG_SHA256
> > {
> > @@ -152,7 +146,6 @@ static struct hash_algo hash_algo[] = {
> > hash_update_sha256,
> > hash_finish_sha256,
> > },
> > -#define MULTI_HASH
> > #endif
> > {
> > "crc32",
> > @@ -165,6 +158,10 @@ static struct hash_algo hash_algo[] = {
> > },
> > };
> >
> > +#if defined(CONFIG_SHA256) || defined(CONFIG_CMD_SHA1SUM) #define
> > +MULTI_HASH #endif
> > +
> > #if defined(CONFIG_HASH_VERIFY) || defined(CONFIG_CMD_HASH) #define
> > MULTI_HASH #endif @@ -311,6 +308,24 @@ int hash_lookup_algo(const
> > char *algo_name, struct hash_algo **algop)
> > return -EPROTONOSUPPORT;
> > }
> >
> > +int hash_progressive_lookup_algo(const char *algo_name,
> > + struct hash_algo **algop) {
> > + int i;
> > +
> > + for (i = 0; i < ARRAY_SIZE(hash_algo); i++) {
> > + if (!strcmp(algo_name, hash_algo[i].name)) {
> > + if (hash_algo[i].hash_init) {
> > + *algop = &hash_algo[i];
> > + return 0;
> > + }
> > + }
> > + }
>
> Can't you just call hash_lookup_algo() and then check for hash_init?
Hash_lookup_algo always searches from the start of hash_algo[]. So what you have suggested above wouldn't work.
>
> > +
> > + debug("Unknown hash algorithm '%s'\n", algo_name);
> > + return -EPROTONOSUPPORT;
> > +}
> > +
> > void hash_show(struct hash_algo *algo, ulong addr, ulong len, uint8_t
> > *output) {
> > int i;
> > diff --git a/include/hash.h b/include/hash.h index d8ec4f0..c0a7ebc
> > 100644
> > --- a/include/hash.h
> > +++ b/include/hash.h
> > @@ -128,6 +128,20 @@ int hash_block(const char *algo_name, const void
> > *data, unsigned int len, int hash_lookup_algo(const char *algo_name,
> > struct hash_algo **algop);
> >
> > /**
> > + * hash_progressive_lookup_algo() - Look up hash_algo for prog. hash
> > +support
> > + *
> > + * The function returns the pointer to the struct or -EPROTONOSUPPORT
> > +if the
> > + * algorithm is not available with progressive hash support.
> > + *
> > + * @algo_name: Hash algorithm to look up
> > + * @algop: Pointer to the hash_algo struct if found
> > + *
> > + * @return 0 if ok, -EPROTONOSUPPORT for an unknown algorithm.
> > + */
> > +int hash_progressive_lookup_algo(const char *algo_name,
> > + struct hash_algo **algop);
> > +
> > +/**
> > * hash_show() - Print out a hash algorithm and value
> > *
> > * You will get a message like this (without a newline at the end):
> > --
> > 1.8.1.4
> >
>
> Regards,
> Simon
Regards,
Ruchika
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