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131 .IX Title "d2i_ECPrivateKey 3"
132 .TH d2i_ECPrivateKey 3 "2017-01-26" "1.0.2k" "OpenSSL"
133 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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138 i2d_ECPrivateKey, d2i_ECPrivate_key \- Encode and decode functions for saving and
139 reading EC_KEY structures
141 .IX Header "SYNOPSIS"
143 \& #include <openssl/ec.h>
145 \& EC_KEY *d2i_ECPrivateKey(EC_KEY **key, const unsigned char **in, long len);
146 \& int i2d_ECPrivateKey(EC_KEY *key, unsigned char **out);
148 \& unsigned int EC_KEY_get_enc_flags(const EC_KEY *key);
149 \& void EC_KEY_set_enc_flags(EC_KEY *eckey, unsigned int flags);
152 .IX Header "DESCRIPTION"
153 The ECPrivateKey encode and decode routines encode and parse an
154 \&\fB\s-1EC_KEY\s0\fR structure into a binary format (\s-1ASN.1 DER\s0) and back again.
156 These functions are similar to the \fId2i_X509()\fR functions, and you should refer to
157 that page for a detailed description (see \fId2i_X509\fR\|(3)).
159 The format of the external representation of the public key written by
160 i2d_ECPrivateKey (such as whether it is stored in a compressed form or not) is
161 described by the point_conversion_form. See \fIEC_GROUP_copy\fR\|(3)
162 for a description of point_conversion_form.
164 When reading a private key encoded without an associated public key (e.g. if
165 \&\s-1EC_PKEY_NO_PUBKEY\s0 has been used \- see below), then d2i_ECPrivateKey generates
166 the missing public key automatically. Private keys encoded without parameters
167 (e.g. if \s-1EC_PKEY_NO_PARAMETERS\s0 has been used \- see below) cannot be loaded using
170 The functions EC_KEY_get_enc_flags and EC_KEY_set_enc_flags get and set the
171 value of the encoding flags for the \fBkey\fR. There are two encoding flags
172 currently defined \- \s-1EC_PKEY_NO_PARAMETERS\s0 and \s-1EC_PKEY_NO_PUBKEY. \s0 These flags
173 define the behaviour of how the \fBkey\fR is converted into \s-1ASN1\s0 in a call to
174 i2d_ECPrivateKey. If \s-1EC_PKEY_NO_PARAMETERS\s0 is set then the public parameters for
175 the curve are not encoded along with the private key. If \s-1EC_PKEY_NO_PUBKEY\s0 is
176 set then the public key is not encoded along with the private key.
178 .IX Header "RETURN VALUES"
179 \&\fId2i_ECPrivateKey()\fR returns a valid \fB\s-1EC_KEY\s0\fR structure or \fB\s-1NULL\s0\fR if an error
180 occurs. The error code that can be obtained by
181 \&\fIERR_get_error\fR\|(3).
183 \&\fIi2d_ECPrivateKey()\fR returns the number of bytes successfully encoded or a
184 negative value if an error occurs. The error code can be obtained by
185 \&\fIERR_get_error\fR\|(3).
187 EC_KEY_get_enc_flags returns the value of the current encoding flags for the
190 .IX Header "SEE ALSO"
191 \&\fIcrypto\fR\|(3), \fIec\fR\|(3), \fIEC_GROUP_new\fR\|(3),
192 \&\fIEC_GROUP_copy\fR\|(3), \fIEC_POINT_new\fR\|(3),
193 \&\fIEC_POINT_add\fR\|(3),
194 \&\fIEC_GFp_simple_method\fR\|(3),
195 \&\fId2i_ECPKParameters\fR\|(3),
196 \&\fId2i_ECPrivateKey\fR\|(3)