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EC_KEY_priv2oct.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" EC_KEY_get_method, EC_KEY_set_method, EC_KEY_new, EC_KEY_get_flags, EC_KEY_set_flags, EC_KEY_clear_flags, EC_KEY_new_by_curve_name, EC_KEY_free, EC_KEY_copy, EC_KEY_dup, EC_KEY_up_ref, EC_KEY_get0_engine, EC_KEY_get0_group, EC_KEY_set_group, EC_KEY_get0_private_key, EC_KEY_set_private_key, EC_KEY_get0_public_key, EC_KEY_set_public_key, EC_KEY_get_conv_form, EC_KEY_set_conv_form, EC_KEY_set_asn1_flag, EC_KEY_decoded_from_explicit_params, EC_KEY_precompute_mult, EC_KEY_generate_key, EC_KEY_check_key, EC_KEY_set_public_key_affine_coordinates, EC_KEY_oct2key, EC_KEY_key2buf, EC_KEY_oct2priv, EC_KEY_priv2oct, EC_KEY_priv2buf \- Functions for creating, destroying and manipulating EC_KEY objects .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/ec.h> \& \& EC_KEY *EC_KEY_new(void); \& int EC_KEY_get_flags(const EC_KEY *key); \& void EC_KEY_set_flags(EC_KEY *key, int flags); \& void EC_KEY_clear_flags(EC_KEY *key, int flags); \& EC_KEY *EC_KEY_new_by_curve_name(int nid); \& void EC_KEY_free(EC_KEY *key); \& EC_KEY *EC_KEY_copy(EC_KEY *dst, const EC_KEY *src); \& EC_KEY *EC_KEY_dup(const EC_KEY *src); \& int EC_KEY_up_ref(EC_KEY *key); \& ENGINE *EC_KEY_get0_engine(const EC_KEY *eckey); \& const EC_GROUP *EC_KEY_get0_group(const EC_KEY *key); \& int EC_KEY_set_group(EC_KEY *key, const EC_GROUP *group); \& const BIGNUM *EC_KEY_get0_private_key(const EC_KEY *key); \& int EC_KEY_set_private_key(EC_KEY *key, const BIGNUM *priv_key); \& const EC_POINT *EC_KEY_get0_public_key(const EC_KEY *key); \& int EC_KEY_set_public_key(EC_KEY *key, const EC_POINT *pub); \& point_conversion_form_t EC_KEY_get_conv_form(const EC_KEY *key); \& void EC_KEY_set_conv_form(EC_KEY *eckey, point_conversion_form_t cform); \& void EC_KEY_set_asn1_flag(EC_KEY *eckey, int asn1_flag); \& int EC_KEY_decoded_from_explicit_params(const EC_KEY *key); \& int EC_KEY_precompute_mult(EC_KEY *key, BN_CTX *ctx); \& int EC_KEY_generate_key(EC_KEY *key); \& int EC_KEY_check_key(const EC_KEY *key); \& int EC_KEY_set_public_key_affine_coordinates(EC_KEY *key, BIGNUM *x, BIGNUM *y); \& const EC_KEY_METHOD *EC_KEY_get_method(const EC_KEY *key); \& int EC_KEY_set_method(EC_KEY *key, const EC_KEY_METHOD *meth); \& \& int EC_KEY_oct2key(EC_KEY *eckey, const unsigned char *buf, size_t len, BN_CTX *ctx); \& size_t EC_KEY_key2buf(const EC_KEY *eckey, point_conversion_form_t form, \& unsigned char **pbuf, BN_CTX *ctx); \& \& int EC_KEY_oct2priv(EC_KEY *eckey, const unsigned char *buf, size_t len); \& size_t EC_KEY_priv2oct(const EC_KEY *eckey, unsigned char *buf, size_t len); \& \& size_t EC_KEY_priv2buf(const EC_KEY *eckey, unsigned char **pbuf); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" An \s-1EC_KEY\s0 represents a public key and, optionally, the associated private key. A new \s-1EC_KEY\s0 with no associated curve can be constructed by calling \&\fBEC_KEY_new()\fR. The reference count for the newly created \s-1EC_KEY\s0 is initially set to 1. A curve can be associated with the \s-1EC_KEY\s0 by calling \&\fBEC_KEY_set_group()\fR. .PP Alternatively a new \s-1EC_KEY\s0 can be constructed by calling \&\fBEC_KEY_new_by_curve_name()\fR and supplying the nid of the associated curve. See \&\fBEC_GROUP_new\fR\|(3) for a description of curve names. This function simply wraps calls to \fBEC_KEY_new()\fR and \fBEC_GROUP_new_by_curve_name()\fR. .PP Calling \fBEC_KEY_free()\fR decrements the reference count for the \s-1EC_KEY\s0 object, and if it has dropped to zero then frees the memory associated with it. If \&\fBkey\fR is \s-1NULL\s0 nothing is done. .PP \&\fBEC_KEY_copy()\fR copies the contents of the \s-1EC_KEY\s0 in \fBsrc\fR into \fBdest\fR. .PP \&\fBEC_KEY_dup()\fR creates a new \s-1EC_KEY\s0 object and copies \fBec_key\fR into it. .PP \&\fBEC_KEY_up_ref()\fR increments the reference count associated with the \s-1EC_KEY\s0 object. .PP \&\fBEC_KEY_get0_engine()\fR returns a handle to the \s-1ENGINE\s0 that has been set for this \s-1EC_KEY\s0 object. .PP \&\fBEC_KEY_generate_key()\fR generates a new public and private key for the supplied \&\fBeckey\fR object. \fBeckey\fR must have an \s-1EC_GROUP\s0 object associated with it before calling this function. The private key is a random integer (0 < priv_key < order, where \fIorder\fR is the order of the \s-1EC_GROUP\s0 object). The public key is an \s-1EC_POINT\s0 on the curve calculated by multiplying the generator for the curve by the private key. .PP \&\fBEC_KEY_check_key()\fR performs various sanity checks on the \s-1EC_KEY\s0 object to confirm that it is valid. .PP \&\fBEC_KEY_set_public_key_affine_coordinates()\fR sets the public key for \fBkey\fR based on its affine co-ordinates; i.e., it constructs an \s-1EC_POINT\s0 object based on the supplied \fBx\fR and \fBy\fR values and sets the public key to be this \&\s-1EC_POINT.\s0 It also performs certain sanity checks on the key to confirm that it is valid. .PP The functions \fBEC_KEY_get0_group()\fR, \fBEC_KEY_set_group()\fR, \&\fBEC_KEY_get0_private_key()\fR, \fBEC_KEY_set_private_key()\fR, \fBEC_KEY_get0_public_key()\fR, and \fBEC_KEY_set_public_key()\fR get and set the \s-1EC_GROUP\s0 object, the private key, and the \s-1EC_POINT\s0 public key for the \fBkey\fR respectively. The function \&\fBEC_KEY_set_private_key()\fR accepts \s-1NULL\s0 as the priv_key argument to securely clear the private key component from the \s-1EC_KEY.\s0 .PP The functions \fBEC_KEY_get_conv_form()\fR and \fBEC_KEY_set_conv_form()\fR get and set the point_conversion_form for the \fBkey\fR. For a description of point_conversion_forms please see \fBEC_POINT_new\fR\|(3). .PP \&\fBEC_KEY_set_flags()\fR sets the flags in the \fBflags\fR parameter on the \s-1EC_KEY\s0 object. Any flags that are already set are left set. The flags currently defined are \s-1EC_FLAG_NON_FIPS_ALLOW\s0 and \s-1EC_FLAG_FIPS_CHECKED.\s0 In addition there is the flag \s-1EC_FLAG_COFACTOR_ECDH\s0 which is specific to \s-1ECDH.\s0 \&\fBEC_KEY_get_flags()\fR returns the current flags that are set for this \s-1EC_KEY.\s0 \&\fBEC_KEY_clear_flags()\fR clears the flags indicated by the \fBflags\fR parameter; all other flags are left in their existing state. .PP \&\fBEC_KEY_set_asn1_flag()\fR sets the asn1_flag on the underlying \s-1EC_GROUP\s0 object (if set). Refer to \fBEC_GROUP_copy\fR\|(3) for further information on the asn1_flag. .PP \&\fBEC_KEY_decoded_from_explicit_params()\fR returns 1 if the group of the \fIkey\fR was decoded from data with explicitly encoded group parameters, \-1 if the \fIkey\fR is \s-1NULL\s0 or the group parameters are missing, and 0 otherwise. .PP \&\fBEC_KEY_precompute_mult()\fR stores multiples of the underlying \s-1EC_GROUP\s0 generator for faster point multiplication. See also \fBEC_POINT_add\fR\|(3). .PP \&\fBEC_KEY_oct2key()\fR and \fBEC_KEY_key2buf()\fR are identical to the functions \&\fBEC_POINT_oct2point()\fR and \fBEC_POINT_point2buf()\fR except they use the public key \&\s-1EC_POINT\s0 in \fBeckey\fR. .PP \&\fBEC_KEY_oct2priv()\fR and \fBEC_KEY_priv2oct()\fR convert between the private key component of \fBeckey\fR and octet form. The octet form consists of the content octets of the \fBprivateKey\fR \s-1OCTET STRING\s0 in an \fBECPrivateKey\fR \s-1ASN.1\s0 structure. .PP The function \fBEC_KEY_priv2oct()\fR must be supplied with a buffer long enough to store the octet form. The return value provides the number of octets stored. Calling the function with a \s-1NULL\s0 buffer will not perform the conversion but will just return the required buffer length. .PP The function \fBEC_KEY_priv2buf()\fR allocates a buffer of suitable length and writes an \s-1EC_KEY\s0 to it in octet format. The allocated buffer is written to \fB*pbuf\fR and its length is returned. The caller must free up the allocated buffer with a call to \fBOPENSSL_free()\fR. Since the allocated buffer value is written to \fB*pbuf\fR the \fBpbuf\fR parameter \fB\s-1MUST NOT\s0\fR be \fB\s-1NULL\s0\fR. .PP \&\fBEC_KEY_priv2buf()\fR converts an \s-1EC_KEY\s0 private key into an allocated buffer. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBEC_KEY_new()\fR, \fBEC_KEY_new_by_curve_name()\fR and \fBEC_KEY_dup()\fR return a pointer to the newly created \s-1EC_KEY\s0 object, or \s-1NULL\s0 on error. .PP \&\fBEC_KEY_get_flags()\fR returns the flags associated with the \s-1EC_KEY\s0 object as an integer. .PP \&\fBEC_KEY_copy()\fR returns a pointer to the destination key, or \s-1NULL\s0 on error. .PP \&\fBEC_KEY_get0_engine()\fR returns a pointer to an \s-1ENGINE,\s0 or \s-1NULL\s0 if it wasn't set. .PP \&\fBEC_KEY_up_ref()\fR, \fBEC_KEY_set_group()\fR, \fBEC_KEY_set_public_key()\fR, \&\fBEC_KEY_precompute_mult()\fR, \fBEC_KEY_generate_key()\fR, \fBEC_KEY_check_key()\fR, \&\fBEC_KEY_set_public_key_affine_coordinates()\fR, \fBEC_KEY_oct2key()\fR and \&\fBEC_KEY_oct2priv()\fR return 1 on success or 0 on error. .PP \&\fBEC_KEY_set_private_key()\fR returns 1 on success or 0 on error except when the priv_key argument is \s-1NULL,\s0 in that case it returns 0, for legacy compatibility, and should not be treated as an error. .PP \&\fBEC_KEY_get0_group()\fR returns the \s-1EC_GROUP\s0 associated with the \s-1EC_KEY.\s0 .PP \&\fBEC_KEY_get0_private_key()\fR returns the private key associated with the \s-1EC_KEY.\s0 .PP \&\fBEC_KEY_get_conv_form()\fR return the point_conversion_form for the \s-1EC_KEY.\s0 .PP \&\fBEC_KEY_key2buf()\fR, \fBEC_KEY_priv2oct()\fR and \fBEC_KEY_priv2buf()\fR return the length of the buffer or 0 on error. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBcrypto\fR\|(7), \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) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2013\-2022 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.
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