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d2i_ECPrivateKey.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" i2d_ECPrivateKey, d2i_ECPrivate_key \- Encode and decode functions for saving and reading EC_KEY structures .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #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); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" The ECPrivateKey encode and decode routines encode and parse an \&\fB\s-1EC_KEY\s0\fR structure into a binary format (\s-1ASN.1 DER\s0) and back again. .PP These functions are similar to the \fBd2i_X509()\fR functions, and you should refer to that page for a detailed description (see \fBd2i_X509\fR\|(3)). .PP 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 \fBEC_GROUP_copy\fR\|(3) for a description of point_conversion_form. .PP When reading a private key encoded without an associated public key (e.g. if \&\s-1EC_PKEY_NO_PUBKEY\s0 has been used \- see below), then d2i_ECPrivateKey generates the missing public key automatically. Private keys encoded without parameters (e.g. if \s-1EC_PKEY_NO_PARAMETERS\s0 has been used \- see below) cannot be loaded using d2i_ECPrivateKey. .PP The functions EC_KEY_get_enc_flags and EC_KEY_set_enc_flags get and set the value of the encoding flags for the \fBkey\fR. There are two encoding flags currently defined \- \s-1EC_PKEY_NO_PARAMETERS\s0 and \s-1EC_PKEY_NO_PUBKEY.\s0 These flags define the behaviour of how the \fBkey\fR is converted into \s-1ASN1\s0 in a call to i2d_ECPrivateKey. If \s-1EC_PKEY_NO_PARAMETERS\s0 is set then the public parameters for the curve are not encoded along with the private key. If \s-1EC_PKEY_NO_PUBKEY\s0 is set then the public key is not encoded along with the private key. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBd2i_ECPrivateKey()\fR returns a valid \fB\s-1EC_KEY\s0\fR structure or \fB\s-1NULL\s0\fR if an error occurs. The error code that can be obtained by \&\fBERR_get_error\fR\|(3). .PP \&\fBi2d_ECPrivateKey()\fR returns the number of bytes successfully encoded or a negative value if an error occurs. The error code can be obtained by \&\fBERR_get_error\fR\|(3). .PP EC_KEY_get_enc_flags returns the value of the current encoding flags for the \&\s-1EC_KEY.\s0 .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBcrypto\fR\|(3), \fBec\fR\|(3), \fBEC_GROUP_new\fR\|(3), \&\fBEC_GROUP_copy\fR\|(3), \fBEC_POINT_new\fR\|(3), \&\fBEC_POINT_add\fR\|(3), \&\fBEC_GFp_simple_method\fR\|(3), \&\fBd2i_ECPKParameters\fR\|(3), \&\fBd2i_ECPrivateKey\fR\|(3)