.\"	$OpenBSD: d2i_ECPKParameters.3,v 1.9 2016/12/25 18:39:35 schwarze Exp $
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.Dd $Mdocdate: December 25 2016 $
.Dt D2I_ECPKPARAMETERS 3
.Os
.Sh NAME
.Nm d2i_ECPKParameters ,
.Nm i2d_ECPKParameters ,
.Nm d2i_ECPKParameters_bio ,
.Nm i2d_ECPKParameters_bio ,
.Nm d2i_ECPKParameters_fp ,
.Nm i2d_ECPKParameters_fp ,
.Nm d2i_ECParameters ,
.Nm i2d_ECParameters ,
.Nm ECParameters_dup ,
.Nm d2i_ECPrivateKey ,
.Nm i2d_ECPrivateKey ,
.Nm d2i_ECPrivateKey_bio ,
.Nm i2d_ECPrivateKey_bio ,
.Nm d2i_ECPrivateKey_fp ,
.Nm i2d_ECPrivateKey_fp ,
.Nm o2i_ECPublicKey ,
.Nm i2o_ECPublicKey ,
.Nm ECPKParameters_print ,
.Nm ECPKParameters_print_fp ,
.Nm ECParameters_print ,
.Nm ECParameters_print_fp ,
.Nm d2i_EC_PUBKEY ,
.Nm i2d_EC_PUBKEY ,
.Nm d2i_EC_PUBKEY_bio ,
.Nm i2d_EC_PUBKEY_bio ,
.Nm d2i_EC_PUBKEY_fp ,
.Nm i2d_EC_PUBKEY_fp
.Nd decode and encode ASN.1 representations of elliptic curve entities
.Sh SYNOPSIS
.In openssl/ec.h
.Ft EC_GROUP *
.Fo d2i_ECPKParameters
.Fa "EC_GROUP **val_out"
.Fa "const unsigned char **des_in"
.Fa "long length"
.Fc
.Ft int
.Fo i2d_ECPKParameters
.Fa "const EC_GROUP *val_in"
.Fa "unsigned char **des_out"
.Fc
.Ft EC_GROUP *
.Fo d2i_ECPKParameters_bio
.Fa "BIO *in_bio"
.Fa "EC_GROUP **val_out"
.Fc
.Ft int
.Fo i2d_ECPKParameters_bio
.Fa "BIO *out_bio"
.Fa "EC_GROUP *val_in"
.Fc
.Ft EC_GROUP *
.Fo d2i_ECPKParameters_fp
.Fa "FILE *in_fp"
.Fa "EC_GROUP **val_out"
.Fc
.Ft int
.Fo i2d_ECPKParameters_fp
.Fa "FILE *out_fp"
.Fa "EC_GROUP *val_in"
.Fc
.Ft EC_KEY *
.Fo d2i_ECParameters
.Fa "EC_KEY **val_out"
.Fa "const unsigned char **des_in"
.Fa "long length"
.Fc
.Ft int
.Fo i2d_ECParameters
.Fa "EC_KEY *val_in"
.Fa "unsigned char **des_out"
.Fc
.Ft EC_KEY *
.Fo ECParameters_dup
.Fa "EC_KEY *val_in"
.Fc
.Ft EC_KEY *
.Fo d2i_ECPrivateKey
.Fa "EC_KEY **val_out"
.Fa "const unsigned char **des_in"
.Fa "long length"
.Fc
.Ft int
.Fo i2d_ECPrivateKey
.Fa "EC_KEY *val_in"
.Fa "unsigned char **des_out"
.Fc
.Ft EC_KEY *
.Fo d2i_ECPrivateKey_bio
.Fa "BIO *in_bio"
.Fa "EC_KEY **val_out"
.Fc
.Ft int
.Fo i2d_ECPrivateKey_bio
.Fa "BIO *out_bio"
.Fa "EC_KEY *val_in"
.Fc
.Ft EC_KEY *
.Fo d2i_ECPrivateKey_fp
.Fa "FILE *in_fp"
.Fa "EC_KEY **val_out"
.Fc
.Ft int
.Fo i2d_ECPKPrivateKey_fp
.Fa "FILE *out_fp"
.Fa "EC_KEY *val_in"
.Fc
.Ft EC_KEY *
.Fo o2i_ECPublicKey
.Fa "EC_KEY **val_out"
.Fa "const unsigned char **des_in"
.Fa "long length"
.Fc
.Ft int
.Fo i2o_ECPublicKey
.Fa "EC_KEY *val_in"
.Fa "unsigned char **des_out"
.Fc
.Ft int
.Fo ECPKParameters_print
.Fa "BIO *out_bio"
.Fa "const EC_GROUP *val_in"
.Fa "int indent"
.Fc
.Ft int
.Fo ECPKParameters_print_fp
.Fa "FILE *out_fp"
.Fa "const EC_GROUP *val_in"
.Fa "int indent"
.Fc
.Ft int
.Fo ECParameters_print
.Fa "BIO *out_bio"
.Fa "const EC_KEY *val_in"
.Fc
.Ft int
.Fo ECParameters_print_fp
.Fa "FILE *out_fp"
.Fa "const EC_KEY *val_in"
.Fc
.In openssl/x509.h
.Ft EC_KEY *
.Fo d2i_EC_PUBKEY
.Fa "EC_KEY **val_out"
.Fa "const unsigned char **des_in"
.Fa "long length"
.Fc
.Ft int
.Fo i2d_EC_PUBKEY
.Fa "EC_KEY *val_in"
.Fa "unsigned char **des_out"
.Fc
.Ft EC_KEY *
.Fo d2i_EC_PUBKEY_bio
.Fa "BIO *in_bio"
.Fa "EC_KEY **val_out"
.Fc
.Ft int
.Fo i2d_EC_PUBKEY_bio
.Fa "BIO *out_bio"
.Fa "EC_KEY *val_in"
.Fc
.Ft EC_KEY *
.Fo d2i_EC_PUBKEY_fp
.Fa "FILE *in_fp"
.Fa "EC_KEY **val_out"
.Fc
.Ft int
.Fo i2d_ECPK_PUBKEY_fp
.Fa "FILE *out_fp"
.Fa "EC_KEY *val_in"
.Fc
.Sh DESCRIPTION
These functions decode and encode elliptic curve keys and parameters.
For details about the semantics, examples, caveats, and bugs, see
.Xr ASN1_item_d2i 3 .
.Pp
.Fn d2i_ECPKParameters
and
.Fn i2d_ECPKParameters
decode and encode the parameters of an elliptic curve.
.Fn d2i_ECPKParameters_bio ,
.Fn i2d_ECPKParameters_bio ,
.Fn d2i_ECPKParameters_fp ,
and
.Fn i2d_ECPKParameters_fp
are similar except that they decode or encode using a
.Vt BIO
or
.Vt FILE
pointer.
These four functions are currently implemented as macros.
.Pp
.Fn d2i_ECParameters
does the same parsing as
.Fn d2i_ECPKParameters
but saves the result in the
.Fa group
field of an
.Vt EC_KEY
structure.
.Pp
.Fn i2d_ECParameters
produces the same output as
.Fn i2d_ECPKParameters
but uses
.Fa val_in->group
for input instead of
.Fa val_in .
.Pp
.Fn ECParameters_dup
allocates and initializes an empty
.Vt EC_KEY
object and copies the EC parameters from
.Fa val_in
to it by calling
.Fn i2d_ECParameters
and
.Fn d2i_ECParameters .
If a private or public key or any flags are present in
.Fa val_in ,
they are not copied.
.Pp
.Fn d2i_ECPrivateKey
and
.Fn i2d_ECPrivateKey
decode and encode an EC private key using an ASN.1
.Vt ECPrivateKey
structure defined in RFC 5915 section 3 and used for the privateKey
field of the ASN.1
.Vt PrivateKeyInfo
structure defined in RFC 5208 section 5, see
.Xr PKCS8_PRIV_KEY_INFO_new 3 .
.Fn d2i_ECPrivateKey_bio ,
.Fn i2d_ECPrivateKey_bio ,
.Fn d2i_ECPrivateKey_fp ,
and
.Fn i2d_ECPrivateKey_fp
are similar except that they decode or encode using a
.Vt BIO
or
.Vt FILE
pointer.
.Pp
.Fn o2i_ECPublicKey
and
.Fn i2o_ECPublicKey
decode and encode an EC public key.
In contrast to
.Xr ASN1_item_d2i 3 ,
.Fn o2i_ECPublicKey
requires
.Fa val_out ,
.Pf * Fa val_out ,
and
.Po Pf * Fa val_out Pc Ns -> Ns Fa group
to be
.Pf non- Dv NULL .
.Pp
.Fn ECPKParameters_print
and
.Fn ECPKParameters_print_fp
print human-readable output of the public parameters of the
.Vt EC_GROUP
to
.Fa out_bio
or
.Fa out_fp .
The output lines are indented by
.Fa indent
spaces.
.Pp
.Fn ECParameters_print
and
.Fn ECParameters_print_fp
print the parameter components of
.Fa val_in
to
.Fa out_bio
or
.Fa out_fp .
.Pp
.Fn d2i_EC_PUBKEY
and
.Fn i2d_EC_PUBKEY
decode and encode an EC public key using an ASN.1
.Vt SubjectPublicKeyInfo
structure defined in RFC 5280 section 4.1 and documented in
.Xr X509_PUBKEY_new 3 .
.Fn d2i_EC_PUBKEY_bio ,
.Fn i2d_EC_PUBKEY_bio ,
.Fn d2i_EC_PUBKEY_fp ,
and
.Fn i2d_EC_PUBKEY_fp
are similar except that they decode or encode using a
.Vt BIO
or
.Vt FILE
pointer.
.Sh RETURN VALUES
.Fn d2i_ECPKParameters ,
.Fn d2i_ECPKParameters_bio ,
and
.Fn d2i_ECPKParameters_fp
return a valid
.Vt EC_GROUP
structure or
.Dv NULL
if an error occurs.
.Pp
.Fn d2i_ECParameters ,
.Fn ECParameters_dup ,
.Fn d2i_ECPrivateKey ,
.Fn d2i_ECPrivateKey_bio ,
.Fn d2i_ECPrivateKey_fp ,
.Fn o2i_ECPublicKey ,
.Fn d2i_EC_PUBKEY ,
.Fn d2i_EC_PUBKEY_bio ,
and
.Fn d2i_EC_PUBKEY_fp
return a valid
.Vt EC_KEY
structure or
.Dv NULL
if an error occurs.
.Pp
.Fn i2d_ECPKParameters ,
.Fn i2d_ECParameters ,
.Fn i2d_ECPrivateKey ,
.Fn i2o_ECPublicKey ,
and
.Fn i2d_EC_PUBKEY
return the number of bytes successfully encoded or a negative value if
an error occurs.
.Pp
.Fn i2d_ECPKParameters_bio ,
.Fn i2d_ECPKParameters_fp ,
.Fn i2d_ECPrivateKey_bio ,
.Fn i2d_ECPKPrivateKey_fp ,
.Fn ECPKParameters_print ,
.Fn ECPKParameters_print_fp ,
.Fn ECParameters_print ,
.Fn ECParameters_print_fp ,
.Fn i2d_EC_PUBKEY_bio ,
and
.Fn i2d_ECPK_PUBKEY_fp
return 1 for success or 0 if an error occurs.
.Sh SEE ALSO
.Xr ASN1_item_d2i 3 ,
.Xr EC_GROUP_copy 3 ,
.Xr EC_GROUP_new 3 ,
.Xr EC_KEY_new 3 ,
.Xr EVP_PKEY_set1_EC_KEY 3 ,
.Xr PEM_write_ECPrivateKey 3 ,
.Xr PKCS8_PRIV_KEY_INFO_new 3 ,
.Xr X509_PUBKEY_new 3
.Sh STANDARDS
RFC 5915: Elliptic Curve Private Key Structure
.Pp
RFC 5208: Public-Key Cryptography Standards (PKCS) #8:
Private-Key Information Syntax Specification
.Pp
RFC 5280: Internet X.509 Public Key Infrastructure Certificate and
Certificate Revocation List (CRL) Profile,
section 4.1: Basic Certificate Fields