1 files changed, 36 insertions, 0 deletions
diff --git a/libkeccak_state_unmarshal.c b/libkeccak_state_unmarshal.c
new file mode 100644
index 0000000..7177bd5
--- /dev/null
+++ b/libkeccak_state_unmarshal.c
@@ -0,0 +1,36 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+/**
+ * Unmarshal a `libkeccak_state_t` from a buffer
+ * 
+ * @param   state  The slot for the unmarshalled state, must not be initialised (memory leak otherwise)
+ * @param   data   The input buffer
+ * @return         The number of bytes read from `data`, 0 on error
+ */
+size_t
+libkeccak_state_unmarshal(libkeccak_state_t *restrict state, const void *restrict data_)
+{
+#define get(type, var) state->var = *((const type *)data), data += sizeof(type) / sizeof(char)
+	const char *restrict data = data_;
+	get(long int, r);
+	get(long int, c);
+	get(long int, n);
+	get(long int, b);
+	get(long int, w);
+	get(int64_t, wmod);
+	get(long int, l);
+	get(long int, nr);
+	memcpy(state->S, data, sizeof(state->S));
+	data += sizeof(state->S) / sizeof(char);
+	get(size_t, mptr);
+	get(size_t, mlen);
+	state->M = malloc(state->mptr * sizeof(char));
+	if (!state->M)
+		return 0;
+	memcpy(state->M, data, state->mptr * sizeof(char));
+	data += state->mptr;
+	return sizeof(libkeccak_state_t) - sizeof(char *) + state->mptr * sizeof(char);
+#undef get
+}