Add BLAKE2X

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

1 files changed, 44 insertions, 0 deletions

diff --git a/libblake_internal_blake2b_output_digest.c b/libblake_internal_blake2b_output_digest.c
new file mode 100644
index 0000000..bc5b407
--- /dev/null
+++ b/libblake_internal_blake2b_output_digest.c
@@ -0,0 +1,44 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+static void
+encode_uint64_le(unsigned char *out, uint_least64_t value, size_t bytes)
+{
+	switch (bytes) {
+	default:
+		out[7] = (unsigned char)((value >> 56) & 255);
+		/* fall through */
+	case 7:
+		out[6] = (unsigned char)((value >> 48) & 255);
+		/* fall through */
+	case 6:
+		out[5] = (unsigned char)((value >> 40) & 255);
+		/* fall through */
+	case 5:
+		out[4] = (unsigned char)((value >> 32) & 255);
+		/* fall through */
+	case 4:
+		out[3] = (unsigned char)((value >> 24) & 255);
+		/* fall through */
+	case 3:
+		out[2] = (unsigned char)((value >> 16) & 255);
+		/* fall through */
+	case 2:
+		out[1] = (unsigned char)((value >>  8) & 255);
+		/* fall through */
+	case 1:
+		out[0] = (unsigned char)((value >>  0) & 255);
+		/* fall through */
+	case 0:
+		break;
+	}
+}
+
+void
+libblake_internal_blake2b_output_digest(struct libblake_blake2b_state *state, size_t output_len, unsigned char *output)
+{
+	size_t i, j;
+
+	for (i = 0, j = 0; i < output_len; i += 8, j += 1)
+		encode_uint64_le(&output[i], state->h[j], output_len - i);
+}