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95 lines
3.9 KiB
C
95 lines
3.9 KiB
C
/*
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Copyright (c) 2012-2015, Matthias Schiffer <mschiffer@universe-factory.net>
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Partly based on public domain code by Matthew Dempsky and D. J. Bernstein.
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _LIBUECC_ECC_H_
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#define _LIBUECC_ECC_H_
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/**
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* A 256 bit integer
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*
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* All functions of libuecc treat \ref ecc_int256_t as unsigned little-endian.
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*/
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typedef union _ecc_int256 {
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/** Data bytes */
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unsigned char p[32];
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} ecc_int256_t;
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/**
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* A point on the curve unpacked for efficient calculation
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*
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* The internal representation of an unpacked point isn't unique, so for serialization
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* it should always be packed.
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*/
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typedef struct _ecc_25519_work {
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unsigned int X[32];
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unsigned int Y[32];
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unsigned int Z[32];
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unsigned int T[32];
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} ecc_25519_work_t;
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/**
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* \defgroup curve_ops Operations on points of the Elliptic Curve
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* @{
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*/
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extern const ecc_25519_work_t ecc_25519_work_identity;
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extern const ecc_25519_work_t ecc_25519_work_default_base;
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int ecc_25519_load_xy(ecc_25519_work_t *out, const ecc_int256_t *x, const ecc_int256_t *y);
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void ecc_25519_store_xy(ecc_int256_t *x, ecc_int256_t *y, const ecc_25519_work_t *in);
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int ecc_25519_load_packed(ecc_25519_work_t *out, const ecc_int256_t *in);
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void ecc_25519_store_packed(ecc_int256_t *out, const ecc_25519_work_t *in);
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int ecc_25519_is_identity(const ecc_25519_work_t *in);
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void ecc_25519_double(ecc_25519_work_t *out, const ecc_25519_work_t *in);
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void ecc_25519_add(ecc_25519_work_t *out, const ecc_25519_work_t *in1, const ecc_25519_work_t *in2);
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void ecc_25519_scalarmult_bits(ecc_25519_work_t *out, const ecc_int256_t *n, const ecc_25519_work_t *base, unsigned bits);
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void ecc_25519_scalarmult(ecc_25519_work_t *out, const ecc_int256_t *n, const ecc_25519_work_t *base);
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void ecc_25519_scalarmult_base_bits(ecc_25519_work_t *out, const ecc_int256_t *n, unsigned bits);
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void ecc_25519_scalarmult_base(ecc_25519_work_t *out, const ecc_int256_t *n);
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/**@}*/
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/**
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* \defgroup gf_ops Prime field operations for the order of the base point of the Elliptic Curve
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* @{
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*/
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extern const ecc_int256_t ecc_25519_gf_order;
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int ecc_25519_gf_is_zero(const ecc_int256_t *in);
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void ecc_25519_gf_add(ecc_int256_t *out, const ecc_int256_t *in1, const ecc_int256_t *in2);
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void ecc_25519_gf_sub(ecc_int256_t *out, const ecc_int256_t *in1, const ecc_int256_t *in2);
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void ecc_25519_gf_reduce(ecc_int256_t *out, const ecc_int256_t *in);
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void ecc_25519_gf_mult(ecc_int256_t *out, const ecc_int256_t *in1, const ecc_int256_t *in2);
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void ecc_25519_gf_recip(ecc_int256_t *out, const ecc_int256_t *in);
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void ecc_25519_gf_sanitize_secret(ecc_int256_t *out, const ecc_int256_t *in);
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/**@}*/
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#endif /* _LIBUECC_ECC_H_ */
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