EDDSA_PK_NEW(3) BSD 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 differ- ent 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), fido_assert_verify(3), fido_cred_pubkey_ptr(3), rs256_pk_new(3) BSD May 15, 2019 BSD
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