EC_KEY_set_conv_form(3)

NAME

       EC_KEY_new, EC_KEY_get_flags, EC_KEY_set_flags, EC_KEY_clear_flags,
       EC_KEY_new_by_curve_name, EC_KEY_free, EC_KEY_copy, EC_KEY_dup,
       EC_KEY_up_ref, EC_KEY_get0_group, EC_KEY_set_group, EC_KEY_get0_pri-
       vate_key, EC_KEY_set_private_key, EC_KEY_get0_public_key,
       EC_KEY_set_public_key, EC_KEY_get_enc_flags, EC_KEY_set_enc_flags,
       EC_KEY_get_conv_form, EC_KEY_set_conv_form, EC_KEY_get_key_method_data,
       EC_KEY_insert_key_method_data, EC_KEY_set_asn1_flag, EC_KEY_precom-
       pute_mult, EC_KEY_generate_key, EC_KEY_check_key, EC_KEY_set_pub-
       lic_key_affine_coordinates - Functions for creating, destroying and
       manipulating EC_KEY objects.

SYNOPSIS

        #include <openssl/ec.h>
        #include <openssl/bn.h>

        EC_KEY *EC_KEY_new(void);
        int EC_KEY_get_flags(const EC_KEY *key);
        void EC_KEY_set_flags(EC_KEY *key, int flags);
        void EC_KEY_clear_flags(EC_KEY *key, int flags);
        EC_KEY *EC_KEY_new_by_curve_name(int nid);
        void EC_KEY_free(EC_KEY *key);
        EC_KEY *EC_KEY_copy(EC_KEY *dst, const EC_KEY *src);
        EC_KEY *EC_KEY_dup(const EC_KEY *src);
        int EC_KEY_up_ref(EC_KEY *key);
        const EC_GROUP *EC_KEY_get0_group(const EC_KEY *key);
        int EC_KEY_set_group(EC_KEY *key, const EC_GROUP *group);
        const BIGNUM *EC_KEY_get0_private_key(const EC_KEY *key);
        int EC_KEY_set_private_key(EC_KEY *key, const BIGNUM *prv);
        const EC_POINT *EC_KEY_get0_public_key(const EC_KEY *key);
        int EC_KEY_set_public_key(EC_KEY *key, const EC_POINT *pub);
        point_conversion_form_t EC_KEY_get_conv_form(const EC_KEY *key);
        void EC_KEY_set_conv_form(EC_KEY *eckey, point_conversion_form_t cform);
        void *EC_KEY_get_key_method_data(EC_KEY *key,
               void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *));
        void EC_KEY_insert_key_method_data(EC_KEY *key, void *data,
               void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *));
        void EC_KEY_set_asn1_flag(EC_KEY *eckey, int asn1_flag);
        int EC_KEY_precompute_mult(EC_KEY *key, BN_CTX *ctx);
        int EC_KEY_generate_key(EC_KEY *key);
        int EC_KEY_check_key(const EC_KEY *key);
        int EC_KEY_set_public_key_affine_coordinates(EC_KEY *key, BIGNUM *x, BIGNUM *y);

DESCRIPTION

       An EC_KEY represents a public key and (optionaly) an associated private
       key. A new EC_KEY (with no associated curve) can be constructed by
       calling EC_KEY_new.  The reference count for the newly created EC_KEY
       is initially set to 1. A curve can be associated with the EC_KEY by
       calling EC_KEY_set_group.

       Alternatively a new EC_KEY can be constructed by calling
       EC_KEY_new_by_curve_name and supplying the nid of the associated curve.
       Refer to EC_GROUP_new(3) for a description of curve names. This func-
       tion simply wraps calls to EC_KEY_new and EC_GROUP_new_by_curve_name.

       Calling EC_KEY_free decrements the reference count for the EC_KEY
       object, and if it has dropped to zero then frees the memory associated
       with it.

       EC_KEY_copy copies the contents of the EC_KEY in src into dest.

       EC_KEY_dup creates a new EC_KEY object and copies ec_key into it.

       EC_KEY_up_ref increments the reference count associated with the EC_KEY
       object.

       EC_KEY_generate_key generates a new public and private key for the sup-
       plied eckey object. eckey must have an EC_GROUP object associated with
       it before calling this function. The private key is a random integer (0
       < priv_key < order, where order is the order of the EC_GROUP object).
       The public key is an EC_POINT on the curve calculated by multiplying
       the generator for the curve by the private key.

       EC_KEY_check_key performs various sanity checks on the EC_KEY object to
       confirm that it is valid.

       EC_KEY_set_public_key_affine_coordinates sets the public key for key
       based on its affine co-ordinates, i.e. it constructs an EC_POINT object
       based on the supplied x and y values and sets the public key to be this
       EC_POINT. It will also performs certain sanity checks on the key to
       confirm that it is valid.

       The functions EC_KEY_get0_group, EC_KEY_set_group, EC_KEY_get0_pri-
       vate_key, EC_KEY_set_private_key, EC_KEY_get0_public_key, and
       EC_KEY_set_public_key get and set the EC_GROUP object, the private key
       and the EC_POINT public key for the key respectively.

       The functions EC_KEY_get_conv_form and EC_KEY_set_conv_form get and set
       the point_conversion_form for the key. For a description of point_con-
       version_forms please refer to EC_POINT_new(3).

       EC_KEY_insert_key_method_data and EC_KEY_get_key_method_data enable the
       caller to associate arbitrary additional data specific to the elliptic
       curve scheme being used with the EC_KEY object. This data is treated as
       a "black box" by the ec library. The data to be stored by
       EC_KEY_insert_key_method_data is provided in the data parameter, which
       must have associated functions for duplicating, freeing and
       "clear_freeing" the data item. If a subsequent
       EC_KEY_get_key_method_data call is issued, the functions for duplicat-
       ing, freeing and "clear_freeing" the data item must be provided again,
       and they must be the same as they were when the data item was inserted.

       EC_KEY_set_flags sets the flags in the flags parameter on the EC_KEY
       object. Any flags that are already set are left set. The currently
       defined standard flags are EC_FLAG_NON_FIPS_ALLOW and
       EC_FLAG_FIPS_CHECKED. In addition there is the flag EC_FLAG_COFAC-
       TOR_ECDH which is specific to ECDH and is defined in ecdh.h.
       EC_KEY_get_flags returns the current flags that are set for this
       EC_KEY. EC_KEY_clear_flags clears the flags indicated by the flags
       parameter. All other flags are left in their existing state.

       EC_KEY_set_asn1_flag sets the asn1_flag on the underlying EC_GROUP
       object (if set). Refer to EC_GROUP_copy(3) for further information on
       the asn1_flag.

       EC_KEY_precompute_mult stores multiples of the underlying EC_GROUP gen-
       erator for faster point multiplication. See also EC_POINT_add(3).

RETURN VALUES

       EC_KEY_new, EC_KEY_new_by_curve_name and EC_KEY_dup return a pointer to
       the newly created EC_KEY object, or NULL on error.

       EC_KEY_get_flags returns the flags associated with the EC_KEY object as
       an integer.

       EC_KEY_copy returns a pointer to the destination key, or NULL on error.

       EC_KEY_up_ref, EC_KEY_set_group, EC_KEY_set_private_key,
       EC_KEY_set_public_key, EC_KEY_precompute_mult, EC_KEY_generate_key,
       EC_KEY_check_key and EC_KEY_set_public_key_affine_coordinates return 1
       on success or 0 on error.

       EC_KEY_get0_group returns the EC_GROUP associated with the EC_KEY.

       EC_KEY_get0_private_key returns the private key associated with the
       EC_KEY.

       EC_KEY_get_conv_form return the point_conversion_form for the EC_KEY.

EC_KEY_set_conv_form(3)

NAME

SYNOPSIS

DESCRIPTION

RETURN VALUES

SEE ALSO