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Diffstat (limited to 'man/es256_pk_new.3')
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diff --git a/man/es256_pk_new.3 b/man/es256_pk_new.3 new file mode 100644 index 0000000..7d6be4d --- /dev/null +++ b/man/es256_pk_new.3 @@ -0,0 +1,164 @@ +.\" Copyright (c) 2018-2022 Yubico AB. All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions are +.\" met: +.\" +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in +.\" the documentation and/or other materials provided with the +.\" distribution. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +.\" "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +.\" LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +.\" A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +.\" HOLDER OR 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. +.\" +.\" SPDX-License-Identifier: BSD-2-Clause +.\" +.Dd $Mdocdate: July 15 2022 $ +.Dt ES256_PK_NEW 3 +.Os +.Sh NAME +.Nm es256_pk_new , +.Nm es256_pk_free , +.Nm es256_pk_from_EC_KEY , +.Nm es256_pk_from_EVP_PKEY , +.Nm es256_pk_from_ptr , +.Nm es256_pk_to_EVP_PKEY +.Nd FIDO2 COSE ES256 API +.Sh SYNOPSIS +.In openssl/ec.h +.In fido/es256.h +.Ft es256_pk_t * +.Fn es256_pk_new "void" +.Ft void +.Fn es256_pk_free "es256_pk_t **pkp" +.Ft int +.Fn es256_pk_from_EC_KEY "es256_pk_t *pk" "const EC_KEY *ec" +.Ft int +.Fn es256_pk_from_EVP_PKEY "es256_pk_t *pk" "const EVP_PKEY *pkey" +.Ft int +.Fn es256_pk_from_ptr "es256_pk_t *pk" "const void *ptr" "size_t len" +.Ft EVP_PKEY * +.Fn es256_pk_to_EVP_PKEY "const es256_pk_t *pk" +.Sh DESCRIPTION +ES256 is the name given in the CBOR Object Signing and Encryption +(COSE) RFC to ECDSA over P-256 with SHA-256. +The COSE ES256 API of +.Em libfido2 +is an auxiliary API with routines to convert between the different +ECDSA public key types used in +.Em libfido2 +and +.Em OpenSSL . +.Pp +In +.Em libfido2 , +ES256 public keys are abstracted by the +.Vt es256_pk_t +type. +.Pp +The +.Fn es256_pk_new +function returns a pointer to a newly allocated, empty +.Vt es256_pk_t +type. +If memory cannot be allocated, NULL is returned. +.Pp +The +.Fn es256_pk_free +function releases the memory backing +.Fa *pkp , +where +.Fa *pkp +must have been previously allocated by +.Fn es256_pk_new . +On return, +.Fa *pkp +is set to NULL. +Either +.Fa pkp +or +.Fa *pkp +may be NULL, in which case +.Fn es256_pk_free +is a NOP. +.Pp +The +.Fn es256_pk_from_EC_KEY +function fills +.Fa pk +with the contents of +.Fa ec . +No references to +.Fa ec +are kept. +.Pp +The +.Fn es256_pk_from_EVP_PKEY +function fills +.Fa pk +with the contents of +.Fa pkey . +No references to +.Fa pkey +are kept. +.Pp +The +.Fn es256_pk_from_ptr +function fills +.Fa pk +with the contents of +.Fa ptr , +where +.Fa ptr +points to +.Fa len +bytes. +The +.Fa ptr +pointer may point to an uncompressed point, or to the +concatenation of the x and y coordinates. +No references to +.Fa ptr +are kept. +.Pp +The +.Fn es256_pk_to_EVP_PKEY +function converts +.Fa pk +to a newly allocated +.Fa EVP_PKEY +type with a reference count of 1. +No internal references to the returned pointer are kept. +If an error occurs, +.Fn es256_pk_to_EVP_PKEY +returns NULL. +.Sh RETURN VALUES +The +.Fn es256_pk_from_EC_KEY , +.Fn es256_pk_from_EVP_PKEY , +and +.Fn es256_pk_from_ptr +functions return +.Dv FIDO_OK +on success. +On error, a different error code defined in +.In fido/err.h +is returned. +.Sh SEE ALSO +.Xr eddsa_pk_new 3 , +.Xr es384_pk_new 3 , +.Xr fido_assert_verify 3 , +.Xr fido_cred_pubkey_ptr 3 , +.Xr rs256_pk_new 3 |