1d2i_ECPrivateKey(3)                 OpenSSL                d2i_ECPrivateKey(3)
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NAME

6       i2d_ECPrivateKey, d2i_ECPrivate_key - Encode and decode functions for
7       saving and reading EC_KEY structures
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SYNOPSIS

10        #include <openssl/ec.h>
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12        EC_KEY *d2i_ECPrivateKey(EC_KEY **key, const unsigned char **in, long len);
13        int i2d_ECPrivateKey(EC_KEY *key, unsigned char **out);
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15        unsigned int EC_KEY_get_enc_flags(const EC_KEY *key);
16        void EC_KEY_set_enc_flags(EC_KEY *eckey, unsigned int flags);
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DESCRIPTION

19       The ECPrivateKey encode and decode routines encode and parse an EC_KEY
20       structure into a binary format (ASN.1 DER) and back again.
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22       These functions are similar to the d2i_X509() functions, and you should
23       refer to that page for a detailed description (see d2i_X509(3)).
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25       The format of the external representation of the public key written by
26       i2d_ECPrivateKey (such as whether it is stored in a compressed form or
27       not) is described by the point_conversion_form. See EC_GROUP_copy(3)
28       for a description of point_conversion_form.
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30       When reading a private key encoded without an associated public key
31       (e.g. if EC_PKEY_NO_PUBKEY has been used - see below), then
32       d2i_ECPrivateKey generates the missing public key automatically.
33       Private keys encoded without parameters (e.g. if EC_PKEY_NO_PARAMETERS
34       has been used - see below) cannot be loaded using d2i_ECPrivateKey.
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36       The functions EC_KEY_get_enc_flags and EC_KEY_set_enc_flags get and set
37       the value of the encoding flags for the key. There are two encoding
38       flags currently defined - EC_PKEY_NO_PARAMETERS and EC_PKEY_NO_PUBKEY.
39       These flags define the behaviour of how the  key is converted into ASN1
40       in a call to i2d_ECPrivateKey. If EC_PKEY_NO_PARAMETERS is set then the
41       public parameters for the curve are not encoded along with the private
42       key. If EC_PKEY_NO_PUBKEY is set then the public key is not encoded
43       along with the private key.
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RETURN VALUES

46       d2i_ECPrivateKey() returns a valid EC_KEY structure or NULL if an error
47       occurs. The error code that can be obtained by ERR_get_error(3).
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49       i2d_ECPrivateKey() returns the number of bytes successfully encoded or
50       a negative value if an error occurs. The error code can be obtained by
51       ERR_get_error(3).
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53       EC_KEY_get_enc_flags returns the value of the current encoding flags
54       for the EC_KEY.
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SEE ALSO

57       crypto(3), ec(3), EC_GROUP_new(3), EC_GROUP_copy(3), EC_POINT_new(3),
58       EC_POINT_add(3), EC_GFp_simple_method(3), d2i_ECPKParameters(3),
59       d2i_ECPrivateKey(3)
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631.0.2k                            2017-01-26               d2i_ECPrivateKey(3)
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