.\" $OpenBSD: d2i_ECPKParameters.3,v 1.13 2024/10/24 21:42:10 tb Exp $ .\" OpenSSL 05ea606a May 20 20:52:46 2016 -0400 .\" .\" This file is a derived work. .\" The changes are covered by the following Copyright and license: .\" .\" Copyright (c) 2016 Ingo Schwarze .\" .\" Permission to use, copy, modify, and distribute this software for any .\" purpose with or without fee is hereby granted, provided that the above .\" copyright notice and this permission notice appear in all copies. .\" .\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES .\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF .\" MERCHANTABILITY AND FITNESS. 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IN NO EVENT SHALL THE OpenSSL PROJECT OR .\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, .\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT .\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; .\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, .\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED .\" OF THE POSSIBILITY OF SUCH DAMAGE. .\" .Dd $Mdocdate: October 24 2024 $ .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 **der_in" .Fa "long length" .Fc .Ft int .Fo i2d_ECPKParameters .Fa "const EC_GROUP *val_in" .Fa "unsigned char **der_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 **der_in" .Fa "long length" .Fc .Ft int .Fo i2d_ECParameters .Fa "EC_KEY *val_in" .Fa "unsigned char **der_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 **der_in" .Fa "long length" .Fc .Ft int .Fo i2d_ECPrivateKey .Fa "EC_KEY *val_in" .Fa "unsigned char **der_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_ECPrivateKey_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 **der_in" .Fa "long length" .Fc .Ft int .Fo i2o_ECPublicKey .Fa "const EC_KEY *val_in" .Fa "unsigned char **der_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 **der_in" .Fa "long length" .Fc .Ft int .Fo i2d_EC_PUBKEY .Fa "EC_KEY *val_in" .Fa "unsigned char **der_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_EC_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_ECPrivateKey_fp , .Fn ECPKParameters_print , .Fn ECPKParameters_print_fp , .Fn ECParameters_print , .Fn ECParameters_print_fp , .Fn i2d_EC_PUBKEY_bio , and .Fn i2d_EC_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 .Sh HISTORY .Fn d2i_ECPKParameters , .Fn i2d_ECPKParameters , .Fn d2i_ECPKParameters_bio , .Fn i2d_ECPKParameters_bio , .Fn d2i_ECPKParameters_fP , .Fn i2d_ECPKParameters_fp , .Fn d2i_ECParameters , .Fn i2d_ECParameters , .Fn ECParameters_dup , .Fn d2i_ECPrivateKey , .Fn i2d_ECPrivateKey , .Fn d2i_ECPrivateKey_bio , .Fn i2d_ECPrivateKey_bio , .Fn d2i_ECPrivateKey_fp , .Fn i2d_ECPrivateKey_fp , .Fn o2i_ECPublicKey , .Fn i2o_ECPublicKey , .Fn ECPKParameters_print , .Fn ECPKParameters_print_fp , .Fn ECParameters_print , .Fn ECParameters_print_fp , .Fn d2i_EC_PUBKEY , .Fn i2d_EC_PUBKEY , .Fn d2i_EC_PUBKEY_bio , .Fn i2d_EC_PUBKEY_bio , .Fn d2i_EC_PUBKEY_fp , and .Fn i2d_EC_PUBKEY_fp first appeared in OpenSSL 0.9.8 and have been available since .Ox 4.5 .