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100 lines
5.0 KiB
100 lines
5.0 KiB
/**
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* Copyright (c) 2013-2014 Tomas Dzetkulic
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* Copyright (c) 2013-2014 Pavol Rusnak
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is 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
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* in 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
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* OR 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
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES
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* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef __ECDSA_H__
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#define __ECDSA_H__
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#include <stdint.h>
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#include "options.h"
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#include "bignum.h"
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// curve point x and y
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typedef struct {
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bignum256 x, y;
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} curve_point;
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typedef struct {
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bignum256 prime; // prime order of the finite field
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curve_point G; // initial curve point
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bignum256 order; // order of G
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bignum256 order_half; // order of G divided by 2
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int a; // coefficient 'a' of the elliptic curve
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bignum256 b; // coefficient 'b' of the elliptic curve
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#if USE_PRECOMPUTED_CP
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const curve_point cp[64][8];
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#endif
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} ecdsa_curve;
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#define MAX_ADDR_RAW_SIZE (4 + 40)
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#define MAX_WIF_RAW_SIZE (4 + 32 + 1)
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#define MAX_ADDR_SIZE (54)
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#define MAX_WIF_SIZE (58)
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// rfc6979 pseudo random number generator state
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typedef struct {
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uint8_t v[32], k[32];
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} rfc6979_state;
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void point_copy(const curve_point *cp1, curve_point *cp2);
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void point_add(const ecdsa_curve *curve, const curve_point *cp1, curve_point *cp2);
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void point_double(const ecdsa_curve *curve, curve_point *cp);
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void point_multiply(const ecdsa_curve *curve, const bignum256 *k, const curve_point *p, curve_point *res);
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void point_set_infinity(curve_point *p);
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int point_is_infinity(const curve_point *p);
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int point_is_equal(const curve_point *p, const curve_point *q);
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int point_is_negative_of(const curve_point *p, const curve_point *q);
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void scalar_multiply(const ecdsa_curve *curve, const bignum256 *k, curve_point *res);
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int ecdh_multiply(const ecdsa_curve *curve, const uint8_t *priv_key, const uint8_t *pub_key, uint8_t *session_key);
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void uncompress_coords(const ecdsa_curve *curve, uint8_t odd, const bignum256 *x, bignum256 *y);
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int ecdsa_uncompress_pubkey(const ecdsa_curve *curve, const uint8_t *pub_key, uint8_t *uncompressed);
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int ecdsa_sign(const ecdsa_curve *curve, const uint8_t *priv_key, const uint8_t *msg, uint32_t msg_len, uint8_t *sig, uint8_t *pby, int (*is_canonical)(uint8_t by, uint8_t sig[64]));
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int ecdsa_sign_double(const ecdsa_curve *curve, const uint8_t *priv_key, const uint8_t *msg, uint32_t msg_len, uint8_t *sig, uint8_t *pby, int (*is_canonical)(uint8_t by, uint8_t sig[64]));
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int ecdsa_sign_digest(const ecdsa_curve *curve, const uint8_t *priv_key, const uint8_t *digest, uint8_t *sig, uint8_t *pby, int (*is_canonical)(uint8_t by, uint8_t sig[64]));
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void ecdsa_get_public_key33(const ecdsa_curve *curve, const uint8_t *priv_key, uint8_t *pub_key);
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void ecdsa_get_public_key65(const ecdsa_curve *curve, const uint8_t *priv_key, uint8_t *pub_key);
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void ecdsa_get_pubkeyhash(const uint8_t *pub_key, uint8_t *pubkeyhash);
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void ecdsa_get_address_raw(const uint8_t *pub_key, uint32_t version, uint8_t *addr_raw);
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void ecdsa_get_address(const uint8_t *pub_key, uint32_t version, char *addr, int addrsize);
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void ecdsa_get_wif(const uint8_t *priv_key, uint32_t version, char *wif, int wifsize);
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int ecdsa_address_decode(const char *addr, uint32_t version, uint8_t *out);
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int ecdsa_read_pubkey(const ecdsa_curve *curve, const uint8_t *pub_key, curve_point *pub);
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int ecdsa_validate_pubkey(const ecdsa_curve *curve, const curve_point *pub);
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int ecdsa_verify(const ecdsa_curve *curve, const uint8_t *pub_key, const uint8_t *sig, const uint8_t *msg, uint32_t msg_len);
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int ecdsa_verify_double(const ecdsa_curve *curve, const uint8_t *pub_key, const uint8_t *sig, const uint8_t *msg, uint32_t msg_len);
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int ecdsa_verify_digest(const ecdsa_curve *curve, const uint8_t *pub_key, const uint8_t *sig, const uint8_t *digest);
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int ecdsa_verify_digest_recover(const ecdsa_curve *curve, uint8_t *pub_key, const uint8_t *sig, const uint8_t *digest, int recid);
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int ecdsa_sig_to_der(const uint8_t *sig, uint8_t *der);
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// Private
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void init_rfc6979(const uint8_t *priv_key, const uint8_t *hash, rfc6979_state *rng);
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void generate_rfc6979(uint8_t rand[32], rfc6979_state *rng);
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void generate_k_rfc6979(bignum256 *k, rfc6979_state *rng);
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void generate_k_random(bignum256 *k, const bignum256 *prime);
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#endif
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