/usr/man/cat.3/d2i_ECPrivateKey.3

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 VALUES

     d2i_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

1.0.2t               Last change: 2019-09-10                    1

d2i_ECPrivateKey(3)          OpenSSL          d2i_ECPrivateKey(3)

     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 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)

1.0.2t               Last change: 2019-09-10                    2