1 files changed, 23 insertions, 0 deletions
diff --git a/hmac_update.c b/hmac_update.c
new file mode 100644
index 0000000..40528a4
--- /dev/null
+++ b/hmac_update.c
@@ -0,0 +1,23 @@
+/* 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
+ */
+void
+libsha1_hmac_update(struct libsha1_hmac_state *restrict state, const void *restrict data, size_t n)
+{
+	if (!state->inited) {
+		libsha1_init(&state->sha1_state, state->sha1_state.algorithm);
+		libsha1_update(&state->sha1_state, state->ipad, state->sha1_state.chunk_size * 8);
+		state->inited = 1;
+	}
+
+	libsha1_update(&state->sha1_state, data, n);
+}