76a42daaa9
This is originally from git@github.com:YanziNetworks/tinyDTLS.git commit d7ca5120e7e853f76e9743db2a0236a26ba71363 Change-Id: I6e6c2da76e11b473ead1b0ddac929f8bd670d7e3 Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
87 lines
4.1 KiB
C
87 lines
4.1 KiB
C
/*
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* Copyright (c) 2009 Chris K Cockrum <ckc@cockrum.net>
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*
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* Copyright (c) 2013 Jens Trillmann <jtrillma@tzi.de>
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* Copyright (c) 2013 Marc Müller-Weinhardt <muewei@tzi.de>
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* Copyright (c) 2013 Lars Schmertmann <lars@tzi.de>
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* Copyright (c) 2013 Hauke Mehrtens <hauke@hauke-m.de>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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*
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* This implementation is based in part on the paper Implementation of an
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* Elliptic Curve Cryptosystem on an 8-bit Microcontroller [0] by
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* Chris K Cockrum <ckc@cockrum.net>.
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*
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* [0]: http://cockrum.net/Implementation_of_ECC_on_an_8-bit_microcontroller.pdf
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*
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* This is a efficient ECC implementation on the secp256r1 curve for 32 Bit CPU
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* architectures. It provides basic operations on the secp256r1 curve and support
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* for ECDH and ECDSA.
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*/
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#include <inttypes.h>
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#define keyLengthInBytes 32
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#define arrayLength 8
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extern const uint32_t ecc_g_point_x[8];
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extern const uint32_t ecc_g_point_y[8];
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//ec Functions
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void ecc_ec_mult(const uint32_t *px, const uint32_t *py, const uint32_t *secret, uint32_t *resultx, uint32_t *resulty);
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static inline void ecc_ecdh(const uint32_t *px, const uint32_t *py, const uint32_t *secret, uint32_t *resultx, uint32_t *resulty) {
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ecc_ec_mult(px, py, secret, resultx, resulty);
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}
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int ecc_ecdsa_validate(const uint32_t *x, const uint32_t *y, const uint32_t *e, const uint32_t *r, const uint32_t *s);
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int ecc_ecdsa_sign(const uint32_t *d, const uint32_t *e, const uint32_t *k, uint32_t *r, uint32_t *s);
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int ecc_is_valid_key(const uint32_t * priv_key);
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static inline void ecc_gen_pub_key(const uint32_t *priv_key, uint32_t *pub_x, uint32_t *pub_y)
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{
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ecc_ec_mult(ecc_g_point_x, ecc_g_point_y, priv_key, pub_x, pub_y);
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}
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#ifdef TEST_INCLUDE
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//ec Functions
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void ecc_ec_add(const uint32_t *px, const uint32_t *py, const uint32_t *qx, const uint32_t *qy, uint32_t *Sx, uint32_t *Sy);
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void ecc_ec_double(const uint32_t *px, const uint32_t *py, uint32_t *Dx, uint32_t *Dy);
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//simple Functions for addition and substraction of big numbers
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uint32_t ecc_add( const uint32_t *x, const uint32_t *y, uint32_t *result, uint8_t length);
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uint32_t ecc_sub( const uint32_t *x, const uint32_t *y, uint32_t *result, uint8_t length);
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//field functions for big numbers
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int ecc_fieldAdd(const uint32_t *x, const uint32_t *y, const uint32_t *reducer, uint32_t *result);
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int ecc_fieldSub(const uint32_t *x, const uint32_t *y, const uint32_t *modulus, uint32_t *result);
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int ecc_fieldMult(const uint32_t *x, const uint32_t *y, uint32_t *result, uint8_t length);
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void ecc_fieldModP(uint32_t *A, const uint32_t *B);
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void ecc_fieldModO(const uint32_t *A, uint32_t *result, uint8_t length);
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void ecc_fieldInv(const uint32_t *A, const uint32_t *modulus, const uint32_t *reducer, uint32_t *B);
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//simple functions to work with the big numbers
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void ecc_copy(const uint32_t *from, uint32_t *to, uint8_t length);
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int ecc_isSame(const uint32_t *A, const uint32_t *B, uint8_t length);
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void ecc_setZero(uint32_t *A, const int length);
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int ecc_isOne(const uint32_t* A);
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void ecc_rshift(uint32_t* A);
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int ecc_isGreater(const uint32_t *A, const uint32_t *B, uint8_t length);
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#endif /* TEST_INCLUDE */
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