Add libsha2_hmac_[un]marshal

Signed-off-by: Mattias Andrée <maandree@kth.se>

1 files changed, 25 insertions, 0 deletions

diff --git a/libsha2.h b/libsha2.h
index d4d52bf..21e0b98 100644
--- a/libsha2.h
+++ b/libsha2.h
@@ -363,5 +363,30 @@ __attribute__((__leaf__, __nonnull__, __nothrow__))
 #endif
 int libsha2_hmac_digest(struct libsha2_hmac_state *restrict, const void *, size_t, void *);
 
+/**
+ * Marshal an HMAC state into a buffer
+ * 
+ * @param   state  The state to marshal
+ * @param   buf    Output buffer, `NULL` to only return the required size
+ * @return         The number of bytes marshalled to `buf`
+ */
+#if defined(__GNUC__)
+__attribute__((__leaf__, __nonnull__(1), __nothrow__))
+#endif
+size_t libsha2_hmac_marshal(const struct libsha2_hmac_state *restrict, void *restrict);
+
+/**
+ * Unmarshal an HMAC state from a buffer
+ * 
+ * @param   state    Output parameter for the unmarshalled state
+ * @param   buf      The buffer from which the state shall be unmarshalled
+ * @param   bufsize  The maximum number of bytes that can be unmarshalled
+ * @return           The number of read bytes, 0 on failure
+ */
+#if defined(__GNUC__)
+__attribute__((__leaf__, __nonnull__, __nothrow__))
+#endif
+size_t libsha2_hmac_unmarshal(struct libsha2_hmac_state *restrict, const void *restrict, size_t);
+
 
 #endif