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+.\" Copyright (c) 2019-2022 Yubico AB. All rights reserved.
+.\"
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+.\"
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+.\"    2. Redistributions in binary form must reproduce the above copyright
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+.\" "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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+.\" SPDX-License-Identifier: BSD-2-Clause
+.\"
+.Dd $Mdocdate: July 15 2022 $
+.Dt EDDSA_PK_NEW 3
+.Os
+.Sh NAME
+.Nm eddsa_pk_new ,
+.Nm eddsa_pk_free ,
+.Nm eddsa_pk_from_EVP_PKEY ,
+.Nm eddsa_pk_from_ptr ,
+.Nm eddsa_pk_to_EVP_PKEY
+.Nd FIDO2 COSE EDDSA API
+.Sh SYNOPSIS
+.In openssl/evp.h
+.In fido/eddsa.h
+.Ft eddsa_pk_t *
+.Fn eddsa_pk_new "void"
+.Ft void
+.Fn eddsa_pk_free "eddsa_pk_t **pkp"
+.Ft int
+.Fn eddsa_pk_from_EVP_PKEY "eddsa_pk_t *pk" "const EVP_PKEY *pkey"
+.Ft int
+.Fn eddsa_pk_from_ptr "eddsa_pk_t *pk" "const void *ptr" "size_t len"
+.Ft EVP_PKEY *
+.Fn eddsa_pk_to_EVP_PKEY "const eddsa_pk_t *pk"
+.Sh DESCRIPTION
+EDDSA is the name given in the CBOR Object Signing and Encryption
+(COSE) RFC to EDDSA over Curve25519 with SHA-512.
+The COSE EDDSA API of
+.Em libfido2
+is an auxiliary API with routines to convert between the different
+EDDSA public key types used in
+.Em libfido2
+and
+.Em OpenSSL .
+.Pp
+In
+.Em libfido2 ,
+EDDSA public keys are abstracted by the
+.Vt eddsa_pk_t
+type.
+.Pp
+The
+.Fn eddsa_pk_new
+function returns a pointer to a newly allocated, empty
+.Vt eddsa_pk_t
+type.
+If memory cannot be allocated, NULL is returned.
+.Pp
+The
+.Fn eddsa_pk_free
+function releases the memory backing
+.Fa *pkp ,
+where
+.Fa *pkp
+must have been previously allocated by
+.Fn eddsa_pk_new .
+On return,
+.Fa *pkp
+is set to NULL.
+Either
+.Fa pkp
+or
+.Fa *pkp
+may be NULL, in which case
+.Fn eddsa_pk_free
+is a NOP.
+.Pp
+The
+.Fn eddsa_pk_from_EVP_PKEY
+function fills
+.Fa pk
+with the contents of
+.Fa pkey .
+No references to
+.Fa pkey
+are kept.
+.Pp
+The
+.Fn eddsa_pk_from_ptr
+function fills
+.Fa pk
+with the contents of
+.Fa ptr ,
+where
+.Fa ptr
+points to
+.Fa len
+bytes.
+No references to
+.Fa ptr
+are kept.
+.Pp
+The
+.Fn eddsa_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 eddsa_pk_to_EVP_PKEY
+returns NULL.
+.Sh RETURN VALUES
+The
+.Fn eddsa_pk_from_EVP_PKEY
+and
+.Fn eddsa_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 es256_pk_new 3 ,
+.Xr es384_pk_new 3 ,
+.Xr fido_assert_verify 3 ,
+.Xr fido_cred_pubkey_ptr 3 ,
+.Xr rs256_pk_new 3