Separate salsa20 set_key functions for 128 and 256 bits.

1 files changed, 53 insertions, 0 deletions

diff --git a/salsa20-128-set-key.c b/salsa20-128-set-key.c
new file mode 100644
index 00000000..4157c0c7
--- /dev/null
+++ b/salsa20-128-set-key.c
@@ -0,0 +1,53 @@
+/*
+ * The Salsa20 stream cipher.
+ */
+
+/* nettle, low-level cryptographics library
+ *
+ * Copyright (C) 2012 Simon Josefsson
+ * Copyright (C) 2012-2014 Niels Möller
+ *  
+ * The nettle library is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or (at your
+ * option) any later version.
+ * 
+ * The nettle library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+ * License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with the nettle library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02111-1301, USA.
+ */
+
+/* Based on:
+   salsa20-ref.c version 20051118
+   D. J. Bernstein
+   Public domain.
+*/
+
+#if HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include "salsa20.h"
+
+#include "macros.h"
+
+void
+salsa20_128_set_key(struct salsa20_ctx *ctx, const uint8_t *key)
+{
+  ctx->input[11] = ctx->input[1] = LE_READ_UINT32(key + 0);
+  ctx->input[12] = ctx->input[2] = LE_READ_UINT32(key + 4);
+  ctx->input[13] = ctx->input[3] = LE_READ_UINT32(key + 8);
+  ctx->input[14] = ctx->input[4] = LE_READ_UINT32(key + 12);
+
+  /* "expand 16-byte k" */
+  ctx->input[0]  = 0x61707865;
+  ctx->input[5]  = 0x3120646e;
+  ctx->input[10] = 0x79622d36;
+  ctx->input[15] = 0x6b206574;
+}