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crypto: digest: speficied when a digest need a key to be used 

such as for hmac(xxx) you must provide a key

This will allow to enforce the correct parameter at digest command

<digest>sum is not impacted

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Jean-Christophe PLAGNIOL-VILLARD 2015-03-18 10:37:53 +01:00 committed by Sascha Hauer
parent b0be99fc10
commit ca95c2531f
3 changed files with 16 additions and 0 deletions
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3
commands/digest.c
View File

@ -34,6 +34,9 @@ int __do_digest(struct digest *d, unsigned char *key, int keylen,
perror("set_key");
goto err;
}
} else if (digest_is_flags(d, DIGEST_ALGO_NEED_KEY)) {
eprintf("%s need a key to be used\n", digest_name(d));
goto err;
}
hash = calloc(digest_length(d), sizeof(unsigned char));

1
crypto/hmac.c
View File

@ -145,6 +145,7 @@ err:
}
struct digest_algo hmac_algo = {
.flags = DIGEST_ALGO_NEED_KEY,
.alloc = digest_hmac_alloc,
.init = digest_hmac_init,
.update = digest_hmac_update,

12
include/digest.h
View File

@ -25,6 +25,8 @@ struct digest;
struct digest_algo {
char *name;
#define DIGEST_ALGO_NEED_KEY (1 << 0)
unsigned int flags;
int (*alloc)(struct digest *d);
void (*free)(struct digest *d);
@ -108,4 +110,14 @@ static inline int digest_set_key(struct digest *d, const unsigned char *key,
return d->algo->set_key(d, key, len);
}
static inline int digest_is_flags(struct digest *d, unsigned int flags)
{
return d->algo->flags & flags;
}
static inline const char *digest_name(struct digest *d)
{
return d->algo->name;
}
#endif /* __SH_ST_DEVICES_H__ */