68 lines
2.6 KiB
Plaintext
68 lines
2.6 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
i2d_ECPrivateKey, d2i_ECPrivate_key - Encode and decode functions for saving and
|
|
reading EC_KEY structures
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/ec.h>
|
|
|
|
EC_KEY *d2i_ECPrivateKey(EC_KEY **key, const unsigned char **in, long len);
|
|
int i2d_ECPrivateKey(EC_KEY *key, unsigned char **out);
|
|
|
|
unsigned int EC_KEY_get_enc_flags(const EC_KEY *key);
|
|
void EC_KEY_set_enc_flags(EC_KEY *eckey, unsigned int flags);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
The ECPrivateKey encode and decode routines encode and parse an
|
|
B<EC_KEY> structure into a binary format (ASN.1 DER) and back again.
|
|
|
|
These functions are similar to the d2i_X509() functions, and you should refer to
|
|
that page for a detailed description (see L<d2i_X509(3)|d2i_X509(3)>).
|
|
|
|
The format of the external representation of the public key written by
|
|
i2d_ECPrivateKey (such as whether it is stored in a compressed form or not) is
|
|
described by the point_conversion_form. See L<EC_GROUP_copy(3)|EC_GROUP_copy(3)>
|
|
for a description of point_conversion_form.
|
|
|
|
When reading a private key encoded without an associated public key (e.g. if
|
|
EC_PKEY_NO_PUBKEY has been used - see below), then d2i_ECPrivateKey generates
|
|
the missing public key automatically. Private keys encoded without parameters
|
|
(e.g. if EC_PKEY_NO_PARAMETERS has been used - see below) cannot be loaded using
|
|
d2i_ECPrivateKey.
|
|
|
|
The functions EC_KEY_get_enc_flags and EC_KEY_set_enc_flags get and set the
|
|
value of the encoding flags for the B<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 B<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.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
d2i_ECPrivateKey() returns a valid B<EC_KEY> structure or B<NULL> if an error
|
|
occurs. The error code that can be obtained by
|
|
L<ERR_get_error(3)|ERR_get_error(3)>.
|
|
|
|
i2d_ECPrivateKey() returns the number of bytes successfully encoded or a
|
|
negative value if an error occurs. The error code can be obtained by
|
|
L<ERR_get_error(3)|ERR_get_error(3)>.
|
|
|
|
EC_KEY_get_enc_flags returns the value of the current encoding flags for the
|
|
EC_KEY.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<crypto(3)|crypto(3)>, L<ec(3)|ec(3)>, L<EC_GROUP_new(3)|EC_GROUP_new(3)>,
|
|
L<EC_GROUP_copy(3)|EC_GROUP_copy(3)>, L<EC_POINT_new(3)|EC_POINT_new(3)>,
|
|
L<EC_POINT_add(3)|EC_POINT_add(3)>,
|
|
L<EC_GFp_simple_method(3)|EC_GFp_simple_method(3)>,
|
|
L<d2i_ECPKParameters(3)|d2i_ECPKParameters(3)>,
|
|
L<d2i_ECPrivateKey(3)|d2i_ECPrivateKey(3)>
|
|
|
|
=cut
|