fc::em::detail::public_key_impl Class Reference

#include <_elliptic_em_impl_pub.hpp>

Collaboration diagram for fc::em::detail::public_key_impl:

Public Member Functions
	public_key_impl () BOOST_NOEXCEPT
	public_key_impl (const public_key_impl &cpy) BOOST_NOEXCEPT
	public_key_impl (public_key_impl &&cpy) BOOST_NOEXCEPT
	~public_key_impl () BOOST_NOEXCEPT
public_key_impl &	operator= (const public_key_impl &pk) BOOST_NOEXCEPT
public_key_impl &	operator= (public_key_impl &&pk) BOOST_NOEXCEPT
	public_key_impl () BOOST_NOEXCEPT
	public_key_impl (const public_key_impl &cpy) BOOST_NOEXCEPT

Static Public Member Functions
static int	ECDSA_SIG_recover_key_GFp (EC_KEY *eckey, ECDSA_SIG *ecsig, const unsigned char *msg, int msglen, int recid, int check)

Public Attributes
EC_KEY *	_key = nullptr
public_key_data	_key

Detailed Description

Definition at line 38 of file elliptic_em.cpp.

Constructor & Destructor Documentation

public_key_impl() [1/5]

fc::em::detail::public_key_impl::public_key_impl

(

)

Definition at line 11 of file elliptic_em_impl_pub.cpp.

        {
            _init_lib();
        }

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public_key_impl() [2/5]

fc::em::detail::public_key_impl::public_key_impl

(

const public_key_impl &

cpy

)

Definition at line 16 of file elliptic_em_impl_pub.cpp.

        {
            _init_lib();
            *this = cpy;
        }

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public_key_impl() [3/5]

fc::em::detail::public_key_impl::public_key_impl

(

public_key_impl &&

cpy

)

Definition at line 22 of file elliptic_em_impl_pub.cpp.

        {
            _init_lib();
            *this = cpy;
        }

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~public_key_impl()

fc::em::detail::public_key_impl::~public_key_impl

(

)

Definition at line 28 of file elliptic_em_impl_pub.cpp.

        {
            free_key();
        }

public_key_impl() [4/5]

fc::em::detail::public_key_impl::public_key_impl ( )

inline

Definition at line 41 of file elliptic_em.cpp.

                {
                    _init_lib();
                }

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public_key_impl() [5/5]

fc::em::detail::public_key_impl::public_key_impl ( const public_key_impl & cpy )

inline

Definition at line 46 of file elliptic_em.cpp.

                    : _key( cpy._key )
                {
                    _init_lib();
                }

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Member Function Documentation

ECDSA_SIG_recover_key_GFp()

int fc::em::detail::public_key_impl::ECDSA_SIG_recover_key_GFp ( EC_KEY * eckey, ECDSA_SIG * ecsig, const unsigned char * msg, int msglen, int recid, int check )

static

Definition at line 68 of file elliptic_em_impl_pub.cpp.

        {
            if (!eckey) FC_THROW_EXCEPTION( exception, "null key" );
 
            int ret = 0;
            BN_CTX *ctx = NULL;
 
            BIGNUM *x = NULL;
            BIGNUM *e = NULL;
            BIGNUM *order = NULL;
            BIGNUM *sor = NULL;
            BIGNUM *eor = NULL;
            BIGNUM *field = NULL;
            EC_POINT *R = NULL;
            EC_POINT *O = NULL;
            EC_POINT *Q = NULL;
            BIGNUM *rr = NULL;
            BIGNUM *zero = NULL;
            int n = 0;
            int i = recid / 2;
 
            const EC_GROUP *group = EC_KEY_get0_group(eckey);
            if ((ctx = BN_CTX_new()) == NULL) { ret = -1; goto err; }
            BN_CTX_start(ctx);
            order = BN_CTX_get(ctx);
            if (!EC_GROUP_get_order(group, order, ctx)) { ret = -2; goto err; }
            x = BN_CTX_get(ctx);
            if (!BN_copy(x, order)) { ret=-1; goto err; }
            if (!BN_mul_word(x, i)) { ret=-1; goto err; }
            if (!BN_add(x, x, ecsig->r)) { ret=-1; goto err; }
            field = BN_CTX_get(ctx);
            if (!EC_GROUP_get_curve_GFp(group, field, NULL, NULL, ctx)) { ret=-2; goto err; }
            if (BN_cmp(x, field) >= 0) { ret=0; goto err; }
            if ((R = EC_POINT_new(group)) == NULL) { ret = -2; goto err; }
            if (!EC_POINT_set_compressed_coordinates_GFp(group, R, x, recid % 2, ctx)) { ret=0; goto err; }
            if (check)
            {
                if ((O = EC_POINT_new(group)) == NULL) { ret = -2; goto err; }
                if (!EC_POINT_mul(group, O, NULL, R, order, ctx)) { ret=-2; goto err; }
                if (!EC_POINT_is_at_infinity(group, O)) { ret = 0; goto err; }
            }
            if ((Q = EC_POINT_new(group)) == NULL) { ret = -2; goto err; }
            n = EC_GROUP_get_degree(group);
            e = BN_CTX_get(ctx);
            if (!BN_bin2bn(msg, msglen, e)) { ret=-1; goto err; }
            if (8*msglen > n) BN_rshift(e, e, 8-(n & 7));
            zero = BN_CTX_get(ctx);
            if (!BN_zero(zero)) { ret=-1; goto err; }
            if (!BN_mod_sub(e, zero, e, order, ctx)) { ret=-1; goto err; }
            rr = BN_CTX_get(ctx);
            if (!BN_mod_inverse(rr, ecsig->r, order, ctx)) { ret=-1; goto err; }
            sor = BN_CTX_get(ctx);
            if (!BN_mod_mul(sor, ecsig->s, rr, order, ctx)) { ret=-1; goto err; }
            eor = BN_CTX_get(ctx);
            if (!BN_mod_mul(eor, e, rr, order, ctx)) { ret=-1; goto err; }
            if (!EC_POINT_mul(group, Q, eor, R, sor, ctx)) { ret=-2; goto err; }
            if (!EC_KEY_set_public_key(eckey, Q)) { ret=-2; goto err; }
 
            ret = 1;
 
        err:
            if (ctx) {
                BN_CTX_end(ctx);
                BN_CTX_free(ctx);
            }
            if (R != NULL) EC_POINT_free(R);
            if (O != NULL) EC_POINT_free(O);
            if (Q != NULL) EC_POINT_free(Q);
            return ret;
        }

operator=() [1/2]

public_key_impl & fc::em::detail::public_key_impl::operator=

(

const public_key_impl &

pk

)

Definition at line 33 of file elliptic_em_impl_pub.cpp.

        {
            if (pk._key == nullptr)
            {
                free_key();
            } else if ( _key == nullptr ) {
                _key = EC_KEY_dup( pk._key );
            } else {
                EC_KEY_copy( _key, pk._key );
            }
            return *this;
        }

operator=() [2/2]

public_key_impl & fc::em::detail::public_key_impl::operator=

(

public_key_impl &&

pk

)

Definition at line 46 of file elliptic_em_impl_pub.cpp.

        {
            if ( this != &pk ) {
                free_key();
                _key = pk._key;
                pk._key = nullptr;
            }
            return *this;
        }

Member Data Documentation

_key [1/2]

EC_KEY* fc::em::detail::public_key_impl::_key = nullptr

Definition at line 27 of file _elliptic_em_impl_pub.hpp.

_key [2/2]

public_key_data fc::em::detail::public_key_impl::_key

Definition at line 52 of file elliptic_em.cpp.

---

The documentation for this class was generated from the following files:

• libraries/fc/src/crypto/_elliptic_em_impl_pub.hpp
• libraries/fc/src/crypto/elliptic_em.cpp
• libraries/fc/src/crypto/elliptic_em_impl_pub.cpp