optimized rotates for keccak

[avr-crypto-lib.git] / keccak / rotate64.h

diff --git a/keccak/rotate64.h b/keccak/rotate64.h
new file mode 100644 (file)
index 0000000..4d60c4c
--- /dev/null
+++ b/keccak/rotate64.h
@@ -0,0 +1,48 @@
+/* rotate64.h */
+/*
+    This file is part of the AVR-Crypto-Lib.
+    Copyright (C) 2010 Daniel Otte (daniel.otte@rub.de)
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program 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 General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef ROTATE64_H_
+#define ROTATE64_H_
+
+#include <stdint.h>
+
+#define ROTL_0 0
+#define ROTL_1 1
+#define ROTL_2 2
+#define ROTL_3 3
+#define ROTL_4 4
+#define ROTR_0 0
+#define ROTR_1 (8+1)
+#define ROTR_2 (8+2)
+#define ROTR_3 (8+3)
+
+
+#define ROT_BIT(a) (((a)<=4)?((a)<<1):(0x01|((8-(a))<<1)))
+
+//#define ROT_CODE(a,b) (((a)<<4) | ((b)&0x0f))
+
+#define ROT_CODE(a) ((((a)/8+((((a)%8)>4)?1:0))<<4) | ROT_BIT(((a)%8)))
+//#define ROT_CODE(a) ((((a)/8)<<4) | ((a)%8)) /* rotations only to the left */
+
+uint64_t rotate64_1bit_left(uint64_t a);
+uint64_t rotate64_1bit_right(uint64_t a);
+uint64_t rotate64_nbit_autodir(uint64_t a, int8_t n);
+uint64_t rotate64left_code(uint64_t a, int8_t code);
+
+#endif /* ROTATE64_H_ */