starting to make bigint more portable/32-bit efficient

[arm-crypto-lib.git] / bigint / bigint.h

diff --git a/bigint/bigint.h b/bigint/bigint.h
new file mode 100644 (file)
index 0000000..2f45d1d
--- /dev/null
+++ b/bigint/bigint.h
@@ -0,0 +1,74 @@
+/* bigint.h */
+/*
+    This file is part of the AVR-Crypto-Lib.
+    Copyright (C) 2008  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/>.
+*/
+/**
+ * \file               bigint.h
+ * \author             Daniel Otte
+ * \date               2010-02-22
+ * 
+ * \license        GPLv3 or later
+ * 
+ */
+
+#ifndef BIGINT_H_
+#define BIGINT_H_
+
+#include <stdint.h>
+
+typedef uint32_t bigint_word_t;
+typedef uint64_t bigint_wordplus_t;
+typedef int64_t  bigint_wordplus_signed_t;
+#define BIGINT_WORD_SIZE 32
+
+#define BIGINT_FBS_MASK (BIGINT_WORD_SIZE-1) /* the last five bits indicate which is the first bit set */
+#define BIGINT_NEG_MASK 0x80 /* this bit indicates a negative value */
+typedef struct{
+       uint16_t length_B;
+       uint8_t info;
+       bigint_word_t *wordv; /* word vector, pointing to the LSB */
+}bigint_t;
+
+
+
+/******************************************************************************/
+
+void   bigint_adjust(bigint_t* a);
+void   bigint_copy(bigint_t* dest, const bigint_t* src);
+void   bigint_add_u(bigint_t* dest, const bigint_t* a, const bigint_t* b);
+void   bigint_add_scale_u(bigint_t* dest, const bigint_t* a, uint16_t scale);
+void   bigint_sub_u(bigint_t* dest, const bigint_t* a, const bigint_t* b);
+int8_t bigint_cmp_u(const bigint_t * a, const bigint_t * b);
+void   bigint_add_s(bigint_t* dest, const bigint_t* a, const bigint_t* b);
+void   bigint_sub_s(bigint_t* dest, const bigint_t* a, const bigint_t* b);
+int8_t bigint_cmp_s(const bigint_t* a, const bigint_t* b);
+void   bigint_shiftleft(bigint_t* a, uint16_t shift);
+void   bigint_shiftright(bigint_t* a, uint16_t shift);
+void   bigint_xor(bigint_t* dest, const bigint_t* a);
+void   bigint_set_zero(bigint_t* a);
+void   bigint_mul_u(bigint_t* dest, const bigint_t* a, const bigint_t* b);
+void   bigint_mul_s(bigint_t* dest, const bigint_t* a, const bigint_t* b);
+void   bigint_square(bigint_t* dest, const bigint_t* a);
+void   bigint_sub_u_bitscale(bigint_t* a, const bigint_t* b, uint16_t bitscale);
+void   bigint_reduce(bigint_t* a, const bigint_t* r);
+void   bigint_expmod_u(bigint_t* dest, const bigint_t* a, const bigint_t* exp, const bigint_t* r);
+void   bigint_gcdext(bigint_t* gcd, bigint_t* a, bigint_t* b, const bigint_t* x, const bigint_t* y);
+void   bigint_inverse(bigint_t* dest, const bigint_t* a, const bigint_t* m);
+void   bigint_changeendianess(bigint_t* a);
+/******************************************************************************/
+
+#endif /*BIGINT_H_*/