d2i_ECPrivateKey(3) OpenSSL d2i_ECPrivateKey(3)NAME
i2d_ECPrivateKey, d2i_ECPrivate_key - Encode and decode functions for
saving and reading EC_KEY structures
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);
DESCRIPTION
The ECPrivateKey encode and decode routines encode and parse an 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 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 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 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.
RETURN VALUESd2i_ECPrivateKey() returns a valid EC_KEY structure or NULL if an error
occurs. The error code that can be obtained by 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
ERR_get_error(3).
EC_KEY_get_enc_flags returns the value of the current encoding flags
for the EC_KEY.
SEE ALSOcrypto(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),
d2i_ECPrivateKey(3)1.0.2f 2016-01-28 d2i_ECPrivateKey(3)
