EC_KEY_set_group (3)

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

Alternatively a new

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 function simply wraps calls to EC_KEY_new and EC_GROUP_new_by_curve_name.

Calling EC_KEY_free decrements the reference count for the

object, and if it has dropped to zero then frees the memory associated with it.

EC_KEY_copy copies the contents of the

in src into dest.

EC_KEY_dup creates a new

object and copies ec_key into it.

EC_KEY_up_ref increments the reference count associated with the

object.

EC_KEY_generate_key generates a new public and private key for the supplied eckey object. eckey must have an

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 object). The public key is an 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

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

object based on the supplied x and y values and sets the public key to be this 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_private_key, EC_KEY_set_private_key, EC_KEY_get0_public_key, and EC_KEY_set_public_key get and set the

object, the private key and the 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_conversion_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

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 duplicating, 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

object. Any flags that are already set are left set. The currently defined standard flags are and In addition there is the flag which is specific to and is defined in ecdh.h. EC_KEY_get_flags returns the current flags that are set for this 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

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

generator 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 object, or on error.

EC_KEY_get_flags returns the flags associated with the

object as an integer.

EC_KEY_copy returns a pointer to the destination key, or

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

associated with the

EC_KEY_get0_private_key returns the private key associated with the

EC_KEY_get_conv_form return the point_conversion_form for the

SEE ALSO

crypto(3), ec(3), EC_GROUP_new(3), EC_GROUP_copy(3), EC_POINT_new(3), EC_POINT_add(3), EC_GFp_simple_method(3), d2i_ECPKParameters(3)