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>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/digest.h b/include/digest.h
index 1c742f615e..5d1d80c31d 100644
--- a/include/digest.h
+++ b/include/digest.h
@@ -32,6 +32,7 @@ struct digest_algo {
 	int (*update)(struct digest *d, const void *data, unsigned long len);
 	int (*final)(struct digest *d, unsigned char *md);
 	int (*set_key)(struct digest *d, const unsigned char *key, unsigned int len);
+	int (*verify)(struct digest *d, const unsigned char *md);
 
 	unsigned int length;
 	unsigned int ctx_length;
@@ -77,6 +78,11 @@ static inline int digest_final(struct digest *d, unsigned char *md)
 	return d->algo->final(d, md);
 }
 
+static inline int digest_verify(struct digest *d, const unsigned char *md)
+{
+	return d->algo->verify(d, md);
+}
+
 static inline int digest_length(struct digest *d)
 {
 	return d->algo->length;