EDDSA_PK_NEW(3) Library Functions Manual EDDSA_PK_NEW(3)
NAME
eddsa_pk_new, eddsa_pk_free, eddsa_pk_from_EVP_PKEY, eddsa_pk_from_ptr,
eddsa_pk_to_EVP_PKEY — FIDO2 COSE EDDSA API
SYNOPSIS
#include <openssl/evp.h>
#include <fido/eddsa.h>
eddsa_pk_t *
eddsa_pk_new(void);
void
eddsa_pk_free(eddsa_pk_t **pkp);
int
eddsa_pk_from_EVP_PKEY(eddsa_pk_t *pk, const EVP_PKEY *pkey);
int
eddsa_pk_from_ptr(eddsa_pk_t *pk, const void *ptr, size_t len);
EVP_PKEY *
eddsa_pk_to_EVP_PKEY(const eddsa_pk_t *pk);
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
libfido2 is an auxiliary API with routines to convert between the dif-
ferent EDDSA public key types used in libfido2 and OpenSSL.
In libfido2, EDDSA public keys are abstracted by the eddsa_pk_t type.
The eddsa_pk_new() function returns a pointer to a newly allocated,
empty eddsa_pk_t type. If memory cannot be allocated, NULL is returned.
The eddsa_pk_free() function releases the memory backing *pkp, where
*pkp must have been previously allocated by eddsa_pk_new(). On return,
*pkp is set to NULL. Either pkp or *pkp may be NULL, in which case
eddsa_pk_free() is a NOP.
The eddsa_pk_from_EVP_PKEY() function fills pk with the contents of
pkey. No references to pkey are kept.
The eddsa_pk_from_ptr() function fills pk with the contents of ptr,
where ptr points to len bytes. No references to ptr are kept.
The eddsa_pk_to_EVP_PKEY() function converts pk to a newly allocated
EVP_PKEY type with a reference count of 1. No internal references to
the returned pointer are kept. If an error occurs,
eddsa_pk_to_EVP_PKEY() returns NULL.
RETURN VALUES
The eddsa_pk_from_EVP_PKEY() and eddsa_pk_from_ptr() functions return
FIDO_OK on success. On error, a different error code defined in
<fido/err.h> is returned.
SEE ALSO
es256_pk_new(3), es384_pk_new(3), fido_assert_verify(3),
fido_cred_pubkey_ptr(3), rs256_pk_new(3)
Debian July 15, 2022 EDDSA_PK_NEW(3)
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