mirror of
https://github.com/openssl/openssl.git
synced 2024-12-27 06:21:43 +08:00
246 lines
10 KiB
Plaintext
246 lines
10 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
EVP_EC_gen,
|
|
EC_KEY_get_method, EC_KEY_set_method, EC_KEY_new_ex,
|
|
EC_KEY_new, EC_KEY_get_flags, EC_KEY_set_flags, EC_KEY_clear_flags,
|
|
EC_KEY_new_by_curve_name_ex, EC_KEY_new_by_curve_name, EC_KEY_free,
|
|
EC_KEY_copy, EC_KEY_dup, EC_KEY_up_ref, EC_KEY_get0_engine,
|
|
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_conv_form,
|
|
EC_KEY_set_conv_form, EC_KEY_set_asn1_flag,
|
|
EC_KEY_decoded_from_explicit_params, EC_KEY_precompute_mult,
|
|
EC_KEY_generate_key, EC_KEY_check_key, EC_KEY_set_public_key_affine_coordinates,
|
|
EC_KEY_oct2key, EC_KEY_key2buf, EC_KEY_oct2priv, EC_KEY_priv2oct,
|
|
EC_KEY_priv2buf - Functions for creating, destroying and manipulating
|
|
EC_KEY objects
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/ec.h>
|
|
|
|
EVP_PKEY *EVP_EC_gen(const char *curve);
|
|
|
|
The following functions have been deprecated since OpenSSL 3.0, and can be
|
|
hidden entirely by defining B<OPENSSL_API_COMPAT> with a suitable version value,
|
|
see L<openssl_user_macros(7)>:
|
|
|
|
EC_KEY *EC_KEY_new_ex(OSSL_LIB_CTX *ctx, const char *propq);
|
|
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_ex(OSSL_LIB_CTX *ctx, const char *propq,
|
|
int nid);
|
|
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);
|
|
ENGINE *EC_KEY_get0_engine(const EC_KEY *eckey);
|
|
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 *priv_key);
|
|
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_set_asn1_flag(EC_KEY *eckey, int asn1_flag);
|
|
int EC_KEY_decoded_from_explicit_params(const EC_KEY *key);
|
|
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);
|
|
const EC_KEY_METHOD *EC_KEY_get_method(const EC_KEY *key);
|
|
int EC_KEY_set_method(EC_KEY *key, const EC_KEY_METHOD *meth);
|
|
|
|
int EC_KEY_oct2key(EC_KEY *eckey, const unsigned char *buf, size_t len, BN_CTX *ctx);
|
|
size_t EC_KEY_key2buf(const EC_KEY *eckey, point_conversion_form_t form,
|
|
unsigned char **pbuf, BN_CTX *ctx);
|
|
|
|
int EC_KEY_oct2priv(EC_KEY *eckey, const unsigned char *buf, size_t len);
|
|
size_t EC_KEY_priv2oct(const EC_KEY *eckey, unsigned char *buf, size_t len);
|
|
|
|
size_t EC_KEY_priv2buf(const EC_KEY *eckey, unsigned char **pbuf);
|
|
int EC_KEY_precompute_mult(EC_KEY *key, BN_CTX *ctx);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
EVP_EC_gen() generates a new EC key pair on the given I<curve>.
|
|
|
|
All of the functions described below are deprecated.
|
|
Applications should instead use EVP_EC_gen(), L<EVP_PKEY_Q_keygen(3)>, or
|
|
L<EVP_PKEY_keygen_init(3)> and L<EVP_PKEY_keygen(3)>.
|
|
|
|
An EC_KEY represents a public key and, optionally, the associated private
|
|
key.
|
|
A new EC_KEY with no associated curve can be constructed by calling
|
|
EC_KEY_new_ex() and specifying the associated library context in I<ctx>
|
|
(see L<OSSL_LIB_CTX(3)>) and property query string I<propq>.
|
|
The I<ctx> parameter may be NULL in which case the default library context is
|
|
used.
|
|
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().
|
|
|
|
EC_KEY_new() is the same as EC_KEY_new_ex() except that the default library
|
|
context is always used.
|
|
|
|
Alternatively a new EC_KEY can be constructed by calling
|
|
EC_KEY_new_by_curve_name_ex() and supplying the nid of the associated
|
|
curve, the library context to be used I<ctx> (see L<OSSL_LIB_CTX(3)>) and any
|
|
property query string I<propq>.
|
|
The I<ctx> parameter may be NULL in which case the default library context is
|
|
used. The I<propq> value may also be NULL.
|
|
See L<EC_GROUP_new(3)> for a description of curve names.
|
|
This function simply wraps calls to EC_KEY_new_ex() and
|
|
EC_GROUP_new_by_curve_name_ex().
|
|
|
|
EC_KEY_new_by_curve_name() is the same as EC_KEY_new_by_curve_name_ex()
|
|
except that the default library context is always used and a NULL property query
|
|
string.
|
|
|
|
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. If
|
|
I<key> is NULL nothing is done.
|
|
|
|
EC_KEY_copy() copies the contents of the EC_KEY in I<src> into I<dest>.
|
|
|
|
EC_KEY_dup() creates a new EC_KEY object and copies I<ec_key> into it.
|
|
|
|
EC_KEY_up_ref() increments the reference count associated with the EC_KEY
|
|
object.
|
|
|
|
EC_KEY_get0_engine() returns a handle to the ENGINE that has been set for
|
|
this EC_KEY object.
|
|
|
|
EC_KEY_generate_key() generates a new public and private key for the supplied
|
|
I<eckey> object. I<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 I<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 I<key> based
|
|
on its affine coordinates; i.e., it constructs an EC_POINT object based on
|
|
the supplied I<x> and I<y> values and sets the public key to be this
|
|
EC_POINT. It 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 B<key> respectively. The function
|
|
EC_KEY_set_private_key() accepts NULL as the priv_key argument to securely clear
|
|
the private key component from the EC_KEY.
|
|
|
|
The functions EC_KEY_get_conv_form() and EC_KEY_set_conv_form() get and set the
|
|
point_conversion_form for the I<key>. For a description of
|
|
point_conversion_forms please see L<EC_POINT_new(3)>.
|
|
|
|
EC_KEY_set_flags() sets the flags in the I<flags> parameter on the EC_KEY
|
|
object. Any flags that are already set are left set. The flags currently
|
|
defined 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.
|
|
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 I<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 L<EC_GROUP_copy(3)> for further information on the
|
|
asn1_flag.
|
|
|
|
EC_KEY_decoded_from_explicit_params() returns 1 if the group of the I<key> was
|
|
decoded from data with explicitly encoded group parameters, -1 if the I<key>
|
|
is NULL or the group parameters are missing, and 0 otherwise.
|
|
|
|
EC_KEY_precompute_mult() stores multiples of the underlying EC_GROUP generator
|
|
for faster point multiplication. See also L<EC_POINT_add(3)>.
|
|
Modern versions should instead switch to named curves which OpenSSL has
|
|
hardcoded lookup tables for.
|
|
|
|
EC_KEY_oct2key() and EC_KEY_key2buf() are identical to the functions
|
|
EC_POINT_oct2point() and EC_POINT_point2buf() except they use the public key
|
|
EC_POINT in I<eckey>.
|
|
|
|
EC_KEY_oct2priv() and EC_KEY_priv2oct() convert between the private key
|
|
component of I<eckey> and octet form. The octet form consists of the content
|
|
octets of the I<privateKey> OCTET STRING in an I<ECPrivateKey> ASN.1 structure.
|
|
|
|
The function EC_KEY_priv2oct() must be supplied with a buffer long enough to
|
|
store the octet form. The return value provides the number of octets stored.
|
|
Calling the function with a NULL buffer will not perform the conversion but
|
|
will just return the required buffer length.
|
|
|
|
The function EC_KEY_priv2buf() allocates a buffer of suitable length and writes
|
|
an EC_KEY to it in octet format. The allocated buffer is written to I<*pbuf>
|
|
and its length is returned. The caller must free up the allocated buffer with a
|
|
call to OPENSSL_free(). Since the allocated buffer value is written to I<*pbuf>
|
|
the I<pbuf> parameter B<MUST NOT> be B<NULL>.
|
|
|
|
EC_KEY_priv2buf() converts an EC_KEY private key into an allocated buffer.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
EC_KEY_new_ex(), EC_KEY_new(), EC_KEY_new_by_curve_name_ex(),
|
|
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_get0_engine() returns a pointer to an ENGINE, or NULL if it wasn't set.
|
|
|
|
EC_KEY_up_ref(), EC_KEY_set_group(), EC_KEY_set_public_key(),
|
|
EC_KEY_precompute_mult(), EC_KEY_generate_key(), EC_KEY_check_key(),
|
|
EC_KEY_set_public_key_affine_coordinates(), EC_KEY_oct2key() and
|
|
EC_KEY_oct2priv() return 1 on success or 0 on error.
|
|
|
|
EC_KEY_set_private_key() returns 1 on success or 0 on error except when the
|
|
priv_key argument is NULL, in that case it returns 0, for legacy compatibility,
|
|
and should not be treated as an 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_key2buf(), EC_KEY_priv2oct() and EC_KEY_priv2buf() return the length
|
|
of the buffer or 0 on error.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<EVP_PKEY_Q_keygen(3)>
|
|
L<crypto(7)>, L<EC_GROUP_new(3)>,
|
|
L<EC_GROUP_copy(3)>, L<EC_POINT_new(3)>,
|
|
L<EC_POINT_add(3)>,
|
|
L<EC_GFp_simple_method(3)>,
|
|
L<d2i_ECPKParameters(3)>,
|
|
L<OSSL_LIB_CTX(3)>
|
|
|
|
=head1 HISTORY
|
|
|
|
EVP_EC_gen() was added in OpenSSL 3.0.
|
|
All other functions described here were deprecated in OpenSSL 3.0.
|
|
For replacement see L<EVP_PKEY-EC(7)>.
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2013-2023 The OpenSSL Project Authors. All Rights Reserved.
|
|
|
|
Licensed under the Apache License 2.0 (the "License"). You may not use
|
|
this file except in compliance with the License. You can obtain a copy
|
|
in the file LICENSE in the source distribution or at
|
|
L<https://www.openssl.org/source/license.html>.
|
|
|
|
=cut
|