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