Add HMAC and use void * instead of char * for binary data

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

1 files changed, 26 insertions, 0 deletions

diff --git a/hmac_update.c b/hmac_update.c
new file mode 100644
index 0000000..7f4cef3
--- /dev/null
+++ b/hmac_update.c
@@ -0,0 +1,26 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+/**
+ * Feed data into the HMAC algorithm
+ * 
+ * @param   state  The state of the algorithm
+ * @param   data   Data to feed into the algorithm
+ * @param   n      The number of bytes to feed into the
+ *                 algorithm, this must be a multiple of 8
+ * @return         Zero on success, -1 on error
+ */
+int
+libsha2_hmac_update(struct libsha2_hmac_state *restrict state, const void *restrict data, size_t n)
+{
+	if (!state->inited) {
+		if (libsha2_init(&state->sha2_state, state->sha2_state.algorithm))
+			return -1;
+		libsha2_update(&state->sha2_state, state->ipad, state->sha2_state.chunk_size * 8);
+		state->inited = 1;
+	}
+
+	libsha2_update(&state->sha2_state, data, n);
+	return 0;
+}