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.\" Automatically generated by Pod::Man 2.27 (Pod::Simple 3.28) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. 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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "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. .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 2 \& #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); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" An \s-1EC_KEY\s0 represents a public key and (optionaly) an associated private key. A new \s-1EC_KEY \s0(with no associated curve) can be constructed by calling EC_KEY_new. The reference count for the newly created \s-1EC_KEY\s0 is initially set to 1. A curve can be associated with the \s-1EC_KEY\s0 by calling EC_KEY_set_group. .PP Alternatively a new \s-1EC_KEY\s0 can be constructed by calling EC_KEY_new_by_curve_name and supplying the nid of the associated curve. Refer to \fIEC_GROUP_new\fR\|(3) for a description of curve names. This function simply wraps calls to EC_KEY_new and EC_GROUP_new_by_curve_name. .PP Calling EC_KEY_free decrements the reference count for the \s-1EC_KEY\s0 object, and if it has dropped to zero then frees the memory associated with it. .PP EC_KEY_copy copies the contents of the \s-1EC_KEY\s0 in \fBsrc\fR into \fBdest\fR. .PP EC_KEY_dup creates a new \s-1EC_KEY\s0 object and copies \fBec_key\fR into it. .PP EC_KEY_up_ref increments the reference count associated with the \s-1EC_KEY\s0 object. .PP EC_KEY_generate_key generates a new public and private key for the supplied \fBeckey\fR object. \fBeckey\fR must have an \s-1EC_GROUP\s0 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 \s-1EC_GROUP\s0 object). The public key is an \s-1EC_POINT\s0 on the curve calculated by multiplying the generator for the curve by the private key. .PP EC_KEY_check_key performs various sanity checks on the \s-1EC_KEY\s0 object to confirm that it is valid. .PP EC_KEY_set_public_key_affine_coordinates sets the public key for \fBkey\fR based on its affine co-ordinates, i.e. it constructs an \s-1EC_POINT\s0 object based on the supplied \fBx\fR and \fBy\fR values and sets the public key to be this \s-1EC_POINT.\s0 It will also performs certain sanity checks on the key to confirm that it is valid. .PP 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 \s-1EC_GROUP\s0 object, the private key and the \s-1EC_POINT\s0 public key for the \fBkey\fR respectively. .PP The functions EC_KEY_get_conv_form and EC_KEY_set_conv_form get and set the point_conversion_form for the \fBkey\fR. For a description of point_conversion_forms please refer to \fIEC_POINT_new\fR\|(3). .PP 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 \s-1EC_KEY\s0 object. This data is treated as a \*(L"black box\*(R" by the ec library. The data to be stored by EC_KEY_insert_key_method_data is provided in the \fBdata\fR parameter, which must have associated functions for duplicating, freeing and \*(L"clear_freeing\*(R" the data item. If a subsequent EC_KEY_get_key_method_data call is issued, the functions for duplicating, freeing and \*(L"clear_freeing\*(R" the data item must be provided again, and they must be the same as they were when the data item was inserted. .PP EC_KEY_set_flags sets the flags in the \fBflags\fR parameter on the \s-1EC_KEY\s0 object. Any flags that are already set are left set. The currently defined standard flags are \s-1EC_FLAG_NON_FIPS_ALLOW\s0 and \s-1EC_FLAG_FIPS_CHECKED.\s0 In addition there is the flag \s-1EC_FLAG_COFACTOR_ECDH\s0 which is specific to \s-1ECDH\s0 and is defined in ecdh.h. EC_KEY_get_flags returns the current flags that are set for this \s-1EC_KEY.\s0 EC_KEY_clear_flags clears the flags indicated by the \fBflags\fR parameter. All other flags are left in their existing state. .PP EC_KEY_set_asn1_flag sets the asn1_flag on the underlying \s-1EC_GROUP\s0 object (if set). Refer to \fIEC_GROUP_copy\fR\|(3) for further information on the asn1_flag. .PP EC_KEY_precompute_mult stores multiples of the underlying \s-1EC_GROUP\s0 generator for faster point multiplication. See also \fIEC_POINT_add\fR\|(3). .SH "RETURN VALUES" .IX Header "RETURN VALUES" EC_KEY_new, EC_KEY_new_by_curve_name and EC_KEY_dup return a pointer to the newly created \s-1EC_KEY\s0 object, or \s-1NULL\s0 on error. .PP EC_KEY_get_flags returns the flags associated with the \s-1EC_KEY\s0 object as an integer. .PP EC_KEY_copy returns a pointer to the destination key, or \s-1NULL\s0 on error. .PP 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. .PP EC_KEY_get0_group returns the \s-1EC_GROUP\s0 associated with the \s-1EC_KEY.\s0 .PP EC_KEY_get0_private_key returns the private key associated with the \s-1EC_KEY.\s0 .PP EC_KEY_get_conv_form return the point_conversion_form for the \s-1EC_KEY.\s0 .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fIcrypto\fR\|(3), \fIec\fR\|(3), \fIEC_GROUP_new\fR\|(3), \&\fIEC_GROUP_copy\fR\|(3), \fIEC_POINT_new\fR\|(3), \&\fIEC_POINT_add\fR\|(3), \&\fIEC_GFp_simple_method\fR\|(3), \&\fId2i_ECPKParameters\fR\|(3)