d2i_ECPrivate_key (3)

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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 structure into a binary format () 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

has been used - see below), then d2i_ECPrivateKey generates the missing public key automatically. Private keys encoded without parameters (e.g. if 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 -

and These flags define the behaviour of how the key is converted into in a call to i2d_ECPrivateKey. If is set then the public parameters for the curve are not encoded along with the private key. If is set then the public key is not encoded along with the private key.

RETURN VALUES

d2i_ECPrivateKey() returns a valid structure or 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

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), d2i_ECPrivateKey(3)