358 lines
12 KiB
C++
358 lines
12 KiB
C++
#include <fc/fwd_impl.hpp>
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#include <boost/config.hpp>
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#include "_elliptic_impl_pub.hpp"
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/* used by mixed + openssl */
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namespace fc { namespace ecc {
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namespace detail {
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public_key_impl::public_key_impl() BOOST_NOEXCEPT
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{
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_init_lib();
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}
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public_key_impl::public_key_impl( const public_key_impl& cpy ) BOOST_NOEXCEPT
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{
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_init_lib();
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*this = cpy;
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}
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public_key_impl::public_key_impl( public_key_impl&& cpy ) BOOST_NOEXCEPT
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{
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_init_lib();
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*this = cpy;
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}
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public_key_impl::~public_key_impl() BOOST_NOEXCEPT
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{
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free_key();
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}
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public_key_impl& public_key_impl::operator=( const public_key_impl& pk ) BOOST_NOEXCEPT
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{
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if (pk._key == nullptr)
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{
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free_key();
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} else if ( _key == nullptr ) {
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_key = EC_KEY_dup( pk._key );
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} else {
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EC_KEY_copy( _key, pk._key );
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}
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return *this;
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}
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public_key_impl& public_key_impl::operator=( public_key_impl&& pk ) BOOST_NOEXCEPT
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{
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if ( this != &pk ) {
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free_key();
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_key = pk._key;
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pk._key = nullptr;
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}
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return *this;
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}
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void public_key_impl::free_key() BOOST_NOEXCEPT
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{
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if( _key != nullptr )
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{
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EC_KEY_free(_key);
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_key = nullptr;
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}
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}
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// Perform ECDSA key recovery (see SEC1 4.1.6) for curves over (mod p)-fields
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// recid selects which key is recovered
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// if check is non-zero, additional checks are performed
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int public_key_impl::ECDSA_SIG_recover_key_GFp(EC_KEY *eckey, ECDSA_SIG *ecsig,
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const unsigned char *msg,
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int msglen, int recid, int check)
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{
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if (!eckey) FC_THROW_EXCEPTION( exception, "null key" );
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int ret = 0;
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BN_CTX *ctx = NULL;
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BIGNUM *x = NULL;
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BIGNUM *e = NULL;
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BIGNUM *order = NULL;
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BIGNUM *sor = NULL;
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BIGNUM *eor = NULL;
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BIGNUM *field = NULL;
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EC_POINT *R = NULL;
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EC_POINT *O = NULL;
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EC_POINT *Q = NULL;
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BIGNUM *rr = NULL;
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BIGNUM *zero = NULL;
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int n = 0;
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int i = recid / 2;
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const EC_GROUP *group = EC_KEY_get0_group(eckey);
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if ((ctx = BN_CTX_new()) == NULL) { ret = -1; goto err; }
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BN_CTX_start(ctx);
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order = BN_CTX_get(ctx);
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if (!EC_GROUP_get_order(group, order, ctx)) { ret = -2; goto err; }
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x = BN_CTX_get(ctx);
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if (!BN_copy(x, order)) { ret=-1; goto err; }
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if (!BN_mul_word(x, i)) { ret=-1; goto err; }
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if (!BN_add(x, x, ecsig->r)) { ret=-1; goto err; }
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field = BN_CTX_get(ctx);
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if (!EC_GROUP_get_curve_GFp(group, field, NULL, NULL, ctx)) { ret=-2; goto err; }
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if (BN_cmp(x, field) >= 0) { ret=0; goto err; }
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if ((R = EC_POINT_new(group)) == NULL) { ret = -2; goto err; }
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if (!EC_POINT_set_compressed_coordinates_GFp(group, R, x, recid % 2, ctx)) { ret=0; goto err; }
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if (check)
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{
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if ((O = EC_POINT_new(group)) == NULL) { ret = -2; goto err; }
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if (!EC_POINT_mul(group, O, NULL, R, order, ctx)) { ret=-2; goto err; }
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if (!EC_POINT_is_at_infinity(group, O)) { ret = 0; goto err; }
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}
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if ((Q = EC_POINT_new(group)) == NULL) { ret = -2; goto err; }
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n = EC_GROUP_get_degree(group);
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e = BN_CTX_get(ctx);
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if (!BN_bin2bn(msg, msglen, e)) { ret=-1; goto err; }
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if (8*msglen > n) BN_rshift(e, e, 8-(n & 7));
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zero = BN_CTX_get(ctx);
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if (!BN_zero(zero)) { ret=-1; goto err; }
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if (!BN_mod_sub(e, zero, e, order, ctx)) { ret=-1; goto err; }
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rr = BN_CTX_get(ctx);
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if (!BN_mod_inverse(rr, ecsig->r, order, ctx)) { ret=-1; goto err; }
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sor = BN_CTX_get(ctx);
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if (!BN_mod_mul(sor, ecsig->s, rr, order, ctx)) { ret=-1; goto err; }
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eor = BN_CTX_get(ctx);
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if (!BN_mod_mul(eor, e, rr, order, ctx)) { ret=-1; goto err; }
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if (!EC_POINT_mul(group, Q, eor, R, sor, ctx)) { ret=-2; goto err; }
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if (!EC_KEY_set_public_key(eckey, Q)) { ret=-2; goto err; }
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ret = 1;
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err:
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if (ctx) {
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BN_CTX_end(ctx);
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BN_CTX_free(ctx);
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}
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if (R != NULL) EC_POINT_free(R);
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if (O != NULL) EC_POINT_free(O);
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if (Q != NULL) EC_POINT_free(Q);
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return ret;
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}
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}
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public_key::public_key() {}
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public_key::public_key( const public_key& pk ) : my( pk.my ) {}
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public_key::public_key( public_key&& pk ) : my( std::move( pk.my ) ) {}
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public_key::~public_key() {}
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public_key& public_key::operator=( public_key&& pk )
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{
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my = std::move(pk.my);
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return *this;
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}
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public_key& public_key::operator=( const public_key& pk )
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{
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my = pk.my;
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return *this;
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}
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bool public_key::valid()const
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{
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return my->_key != nullptr;
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}
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/* WARNING! This implementation is broken, it is actually equivalent to
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* public_key::add()!
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*/
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// public_key public_key::mult( const fc::sha256& digest ) const
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// {
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// // get point from this public key
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// const EC_POINT* master_pub = EC_KEY_get0_public_key( my->_key );
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// ec_group group(EC_GROUP_new_by_curve_name(NID_secp256k1));
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//
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// ssl_bignum z;
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// BN_bin2bn((unsigned char*)&digest, sizeof(digest), z);
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//
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// // multiply by digest
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// ssl_bignum one;
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// BN_one(one);
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// bn_ctx ctx(BN_CTX_new());
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//
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// ec_point result(EC_POINT_new(group));
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// EC_POINT_mul(group, result, z, master_pub, one, ctx);
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//
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// public_key rtn;
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// rtn.my->_key = EC_KEY_new_by_curve_name( NID_secp256k1 );
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// EC_KEY_set_public_key(rtn.my->_key,result);
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//
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// return rtn;
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// }
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public_key public_key::add( const fc::sha256& digest )const
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{
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try {
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ec_group group(EC_GROUP_new_by_curve_name(NID_secp256k1));
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bn_ctx ctx(BN_CTX_new());
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fc::bigint digest_bi( (char*)&digest, sizeof(digest) );
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ssl_bignum order;
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EC_GROUP_get_order(group, order, ctx);
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if( digest_bi > fc::bigint(order) )
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{
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FC_THROW_EXCEPTION( exception, "digest > group order" );
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}
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public_key digest_key = private_key::regenerate(digest).get_public_key();
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const EC_POINT* digest_point = EC_KEY_get0_public_key( digest_key.my->_key );
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// get point from this public key
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const EC_POINT* master_pub = EC_KEY_get0_public_key( my->_key );
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// ssl_bignum z;
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// BN_bin2bn((unsigned char*)&digest, sizeof(digest), z);
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// multiply by digest
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// ssl_bignum one;
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// BN_one(one);
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ec_point result(EC_POINT_new(group));
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EC_POINT_add(group, result, digest_point, master_pub, ctx);
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if (EC_POINT_is_at_infinity(group, result))
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{
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FC_THROW_EXCEPTION( exception, "point at infinity" );
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}
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public_key rtn;
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rtn.my->_key = EC_KEY_new_by_curve_name( NID_secp256k1 );
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EC_KEY_set_public_key(rtn.my->_key,result);
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return rtn;
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} FC_RETHROW_EXCEPTIONS( debug, "digest: ${digest}", ("digest",digest) );
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}
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std::string public_key::to_base58() const
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{
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public_key_data key = serialize();
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return to_base58( key );
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}
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// signature private_key::sign( const fc::sha256& digest )const
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// {
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// unsigned int buf_len = ECDSA_size(my->_key);
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//// fprintf( stderr, "%d %d\n", buf_len, sizeof(sha256) );
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// signature sig;
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// assert( buf_len == sizeof(sig) );
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//
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// if( !ECDSA_sign( 0,
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// (const unsigned char*)&digest, sizeof(digest),
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// (unsigned char*)&sig, &buf_len, my->_key ) )
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// {
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// FC_THROW_EXCEPTION( exception, "signing error" );
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// }
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//
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//
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// return sig;
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// }
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// bool public_key::verify( const fc::sha256& digest, const fc::ecc::signature& sig )
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// {
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// return 1 == ECDSA_verify( 0, (unsigned char*)&digest, sizeof(digest), (unsigned char*)&sig, sizeof(sig), my->_key );
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// }
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public_key_data public_key::serialize()const
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{
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public_key_data dat;
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if( !my->_key ) return dat;
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EC_KEY_set_conv_form( my->_key, POINT_CONVERSION_COMPRESSED );
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/*size_t nbytes = i2o_ECPublicKey( my->_key, nullptr ); */
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/*assert( nbytes == 33 )*/
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char* front = &dat.data[0];
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i2o_ECPublicKey( my->_key, (unsigned char**)&front ); // FIXME: questionable memory handling
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return dat;
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/*
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EC_POINT* pub = EC_KEY_get0_public_key( my->_key );
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EC_GROUP* group = EC_KEY_get0_group( my->_key );
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EC_POINT_get_affine_coordinates_GFp( group, pub, self.my->_pub_x.get(), self.my->_pub_y.get(), nullptr );
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*/
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}
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public_key_point_data public_key::serialize_ecc_point()const
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{
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public_key_point_data dat;
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if( !my->_key ) return dat;
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EC_KEY_set_conv_form( my->_key, POINT_CONVERSION_UNCOMPRESSED );
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char* front = &dat.data[0];
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i2o_ECPublicKey( my->_key, (unsigned char**)&front ); // FIXME: questionable memory handling
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return dat;
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}
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public_key::public_key( const public_key_point_data& dat )
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{
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const char* front = &dat.data[0];
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if( *front == 0 ){}
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else
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{
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my->_key = EC_KEY_new_by_curve_name( NID_secp256k1 );
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my->_key = o2i_ECPublicKey( &my->_key, (const unsigned char**)&front, sizeof(dat) );
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if( !my->_key )
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{
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FC_THROW_EXCEPTION( exception, "error decoding public key", ("s", ERR_error_string( ERR_get_error(), nullptr) ) );
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}
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}
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}
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public_key::public_key( const public_key_data& dat )
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{
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const char* front = &dat.data[0];
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if( *front == 0 ){}
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else
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{
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my->_key = EC_KEY_new_by_curve_name( NID_secp256k1 );
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my->_key = o2i_ECPublicKey( &my->_key, (const unsigned char**)&front, sizeof(public_key_data) );
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if( !my->_key )
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{
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FC_THROW_EXCEPTION( exception, "error decoding public key", ("s", ERR_error_string( ERR_get_error(), nullptr) ) );
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}
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}
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}
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// bool private_key::verify( const fc::sha256& digest, const fc::ecc::signature& sig )
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// {
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// return 1 == ECDSA_verify( 0, (unsigned char*)&digest, sizeof(digest), (unsigned char*)&sig, sizeof(sig), my->_key );
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// }
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public_key::public_key( const compact_signature& c, const fc::sha256& digest, bool check_canonical )
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{
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int nV = c.data[0];
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if (nV<27 || nV>=35)
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FC_THROW_EXCEPTION( exception, "unable to reconstruct public key from signature" );
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ECDSA_SIG *sig = ECDSA_SIG_new();
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BN_bin2bn(&c.data[1],32,sig->r);
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BN_bin2bn(&c.data[33],32,sig->s);
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if( check_canonical )
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{
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FC_ASSERT( is_canonical( c ), "signature is not canonical" );
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}
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my->_key = EC_KEY_new_by_curve_name(NID_secp256k1);
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if (nV >= 31)
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{
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EC_KEY_set_conv_form( my->_key, POINT_CONVERSION_COMPRESSED );
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nV -= 4;
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// fprintf( stderr, "compressed\n" );
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}
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if (detail::public_key_impl::ECDSA_SIG_recover_key_GFp(my->_key, sig, (unsigned char*)&digest, sizeof(digest), nV - 27, 0) == 1)
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{
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ECDSA_SIG_free(sig);
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return;
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}
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ECDSA_SIG_free(sig);
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FC_THROW_EXCEPTION( exception, "unable to reconstruct public key from signature" );
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}
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}}
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