[PATCH 5/7] digest: allow algo to specify their length at runtime

[Jean-Christophe PLAGNIOL-VILLARD]

such as RSA as we load a DER key we will detect the key size
at runtime and so the algo length.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com>
---
 include/digest.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/digest.h b/include/digest.h
index c675018..cadc2f6 100644
--- a/include/digest.h
+++ b/include/digest.h
@@ -43,6 +43,7 @@ struct digest_algo {
 struct digest {
 	struct digest_algo *algo;
 	void *ctx;
+	unsigned int length;
 };
 
 /*
@@ -88,7 +89,7 @@ static inline int digest_verify(struct digest *d, const unsigned char *md)
 
 static inline int digest_length(struct digest *d)
 {
-	return d->algo->length;
+	return d->length ? d->length : d->algo->length;
 }
 
 static inline int digest_set_key(struct digest *d, const unsigned char *key,
-- 
2.1.4