from small one page howto to huge articles all in one place
 

search text in:





Poll
Which kernel version do you use?





poll results

Last additions:
using iotop to find disk usage hogs

using iotop to find disk usage hogs

words:

887

views:

104283

userrating:

average rating: 1.7 (85 votes) (1=very good 6=terrible)


May 25th. 2007:
Words

486

Views

218868

why adblockers are bad


Workaround and fixes for the current Core Dump Handling vulnerability affected kernels

Workaround and fixes for the current Core Dump Handling vulnerability affected kernels

words:

161

views:

99408

userrating:

average rating: 1.3 (28 votes) (1=very good 6=terrible)


April, 26th. 2006:

Druckversion
You are here: manpages





EC_KEY_new

Section: OpenSSL (3)
Updated: 2015-01-22
Index Return to Main Contents
 

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);
 unsigned int EC_KEY_get_enc_flags(const EC_KEY *key);
 void EC_KEY_set_enc_flags(EC_KEY *eckey, unsigned int flags);
 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 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 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 supplied 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_private_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_enc_flags and EC_KEY_set_enc_flags get and set the value of the encoding flags for the key. There are two encoding flags currently defined - EC_PKEY_NO_PARAMETERS and EC_PKEY_NO_PUBKEY. These flags define the behaviour of how the key is converted into ASN1 in a call to i2d_ECPrivateKey. If EC_PKEY_NO_PARAMETERS is set then the public parameters for the curve are not encoded along with the private key. If EC_PKEY_NO_PUBKEY is set then the public key is not encoded along with the private key.

When reading a private key encoded with EC_PKEY_NO_PUBKEY, d2i_ECPrivateKey generates the missing public key automatically. Private keys encoded with EC_PKEY_NO_PARAMETERS cannot be loaded using d2i_ECPrivateKey.

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 arbitary 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 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 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_COFACTOR_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 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 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_enc_flags returns the value of the current encoding flags for the EC_KEY.

EC_KEY_get_conv_form return the point_conversion_form for the EC_KEY.  

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)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUES
SEE ALSO


Please read "Why adblockers are bad".



Other free services
toURL.org
Shorten long
URLs to short
links like
http://tourl.org/2
tourl.org
.
Reverse DNS lookup
Find out which hostname(s)
resolve to a
given IP or other hostnames for the server
www.reversednslookup.org
rdf newsfeed | rss newsfeed | Atom newsfeed
- Powered by LeopardCMS - Running on Gentoo -
Copyright 2004-2017 Sascha Nitsch Unternehmensberatung UG(haftungsbeschränkt)
Valid XHTML1.1 : Valid CSS : buttonmaker
- Level Triple-A Conformance to Web Content Accessibility Guidelines 1.0 -
- Copyright and legal notices -
Time to create this page: 3.2 ms