Add *_force_update for BLAKE2[X] (intended for parallel hashing)

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

1 files changed, 19 insertions, 0 deletions

diff --git a/libblake_blake2b_force_update.c b/libblake_blake2b_force_update.c
new file mode 100644
index 0000000..60b8fab
--- /dev/null
+++ b/libblake_blake2b_force_update.c
@@ -0,0 +1,19 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+size_t
+libblake_blake2b_force_update(struct libblake_blake2b_state *state, const void *data_, size_t len)
+{
+	const unsigned char *data = data_;
+	size_t off = 0;
+
+	for (; len - off >= 128; off += 128) {
+		state->t[0] = (state->t[0] + 128) & UINT_LEAST64_C(0xFFFFffffFFFFffff);
+		if (state->t[0] < 128)
+			state->t[1] = (state->t[1] + 1) & UINT_LEAST64_C(0xFFFFffffFFFFffff);
+
+		libblake_internal_blake2b_compress(state, &data[off]);
+	}
+
+	return off;
+}