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.IX Title "EVP_EC_GEN 3ssl"
.TH EVP_EC_GEN 3ssl 2026-10-23 4.1.0 OpenSSL
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.SH NAME
EVP_EC_gen, EVP_EC_affine2oct
\&\- EVP routines for EC keys
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/evp.h>
\&
\& EVP_PKEY *EVP_EC_gen(const char *curve);
\& int EVP_EC_affine2oct(const BIGNUM *x, const BIGNUM *y, size_t field_len,
\&                       unsigned char **pbuf, size_t *pbsize);
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
\&\fBEVP_EC_gen()\fR generates a new EC key pair on the given \fIcurve\fR.
.PP
\&\fBEVP_EC_affine2oct()\fR converts affine coordinates \fIx\fR and \fIy\fR of an EC point
to an octet string conforming to Sec. 2.3.4 of the SECG SEC 1
("Elliptic Curve Cryptography") standard. This octet string can further
be passed to \fBOSSL_PARAM_BLD_push_octet_string()\fR. The length of the field degree
representation (in bytes) must be passed to \fIfield_len\fR. The function allocates
a buffer for octet string and places a pointer to \fI*pbuf\fR. It\*(Aqs the caller\*(Aqs
responsibility to free this buffer with \fBOPENSSL_free()\fR.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBEVP_EC_gen()\fR returns the EC key pair generated or NULL on error.
.PP
\&\fBEVP_EC_affine2oct()\fR returns 1 on success or 0 on error.
.SH HISTORY
.IX Header "HISTORY"
\&\fBEVP_EC_gen()\fR was added in OpenSSL 3.0.
.PP
\&\fBEVP_EC_affine2oct()\fR was added in OpenSSL 4.1.
.SH COPYRIGHT
.IX Header "COPYRIGHT"
Copyright 2013\-2026 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the "License").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file LICENSE in the source distribution or at
<https://www.openssl.org/source/license.html>.