oscore_crypto.h

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/* -*- Mode: C; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 
/*
 * Copyright (c) 2018, SICS, RISE AB
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#ifndef _OSCORE_CRYPTO_H
#define _OSCORE_CRYPTO_H
 
#include <coap3/coap_internal.h>

 
#define HKDF_INFO_MAXLEN   25
#define HKDF_OUTPUT_MAXLEN 25
#define AES_CCM_TAG        8
 
/* Plaintext Maxlen and Tag Maxlen is quite generous. */
#define AEAD_PLAINTEXT_MAXLEN COAP_MAX_CHUNK_SIZE
#define AEAD_TAG_MAXLEN       COAP_MAX_CHUNK_SIZE

int oscore_hmac_hash(cose_hmac_alg_t hmac_alg,
                     coap_bin_const_t *key,
                     coap_bin_const_t *data,
                     coap_bin_const_t **hmac);

int oscore_hkdf_extract(cose_hkdf_alg_t hkdf_alg,
                        coap_bin_const_t *salt,
                        coap_bin_const_t *ikm,
                        coap_bin_const_t **hkdf_extract);

int oscore_hkdf_expand(cose_hkdf_alg_t hkdf_alg,
                       coap_bin_const_t *prk,
                       uint8_t *info,
                       size_t info_len,
                       uint8_t *okm,
                       size_t okm_len);

int oscore_hkdf(cose_hkdf_alg_t hkdf_alg,
                coap_bin_const_t *salt,
                coap_bin_const_t *ikm,
                uint8_t *info,
                size_t info_len,
                uint8_t *okm,
                size_t okm_len);

 
#endif /* _OSCORE_CRYPTO_H */