First commit

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

1 files changed, 39 insertions, 0 deletions

diff --git a/update.c b/update.c
new file mode 100644
index 0000000..7c9ed9b
--- /dev/null
+++ b/update.c
@@ -0,0 +1,39 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+/**
+ * Absorb more of the message
+ * 
+ * @param  state    The hashing state
+ * @param  message  The message, in bits, must be equivalent to 0 modulus 8
+ * @param  msglen   The length of the message
+ */
+void
+libsha1_update(struct libsha1_state *restrict state, const void *restrict message_, size_t msglen)
+{
+	const char *restrict message = message_;
+	size_t n, off;
+
+	off = (state->message_size / 8) % state->chunk_size;
+	state->message_size += msglen;
+	msglen /= 8;
+
+	if (off) {
+		n = msglen < state->chunk_size - off ? msglen : state->chunk_size - off;
+		memcpy(state->chunk + off, message, n);
+		if (off + n == state->chunk_size)
+			libsha1_process(state, state->chunk);
+		message += n;
+		msglen -= n;
+	}
+
+	while (msglen >= state->chunk_size) {
+		libsha1_process(state, (const unsigned char *)message);
+		message += state->chunk_size;
+		msglen -= state->chunk_size;
+	}
+
+	if (msglen)
+		memcpy(state->chunk, message, msglen);
+}