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| author | Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> | 2015-03-17 12:53:10 +0100 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2015-03-19 07:46:22 +0100 |
| commit | ec4f9699718054f2b4e49ed441f3420c257f5f26 (patch) | |
| tree | 43721d010eba21f157bb3b4c053ae31c7a12fc2a /crypto/digest.c | |
| parent | 92138a77544da7ad7d880082e905c1ca8cd0c527 (diff) | |
| download | barebox-ec4f9699718054f2b4e49ed441f3420c257f5f26.tar.gz barebox-ec4f9699718054f2b4e49ed441f3420c257f5f26.tar.xz | |
digest: add verify callback
this will allow to compare a md with the original one
When calling this do not call final
For RSA_SIGN verification final does not exist only verify
as final will be for signing
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'crypto/digest.c')
| -rw-r--r-- | crypto/digest.c | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/crypto/digest.c b/crypto/digest.c index 208a2041b1..7869c049e9 100644 --- a/crypto/digest.c +++ b/crypto/digest.c @@ -26,6 +26,8 @@ #include <module.h> #include <linux/err.h> +#include "internal.h" + static LIST_HEAD(digests); static struct digest_algo *digest_algo_get_by_name(const char *name); @@ -37,9 +39,29 @@ static int dummy_init(struct digest *d) static void dummy_free(struct digest *d) {} +int digest_generic_verify(struct digest *d, const unsigned char *md) +{ + int ret; + int len = digest_length(d); + unsigned char *tmp; + + tmp = xmalloc(len); + + ret = digest_final(d, tmp); + if (ret) + goto end; + + ret = memcmp(md, tmp, len); + ret = ret ? -EINVAL : 0; +end: + free(tmp); + return ret; +} + int digest_algo_register(struct digest_algo *d) { - if (!d || !d->name || !d->update || !d->final || d->length < 1) + if (!d || !d->name || !d->update || !d->final || !d->verify || + d->length < 1) return -EINVAL; if (!d->init) |