mirror of
https://github.com/openssl/openssl.git
synced 2025-01-30 14:01:55 +08:00
78c44b0594
The code is derived from @sftcd's work in PR #17172. This PR puts the DHKEM algorithms into the provider layer as KEM algorithms for EC and ECX. This PR only implements the DHKEM component of HPKE as specified in RFC 9180. crypto/hpke/hpke_util.c has been added for fuctions that will be shared between DHKEM and HPKE. API's for EVP_PKEY_auth_encapsulate_init() and EVP_PKEY_auth_decapsulate_init() have been added to support authenticated encapsulation. auth_init() functions were chosen rather that a EVP_PKEY_KEM_set_auth() interface to support future algorithms that could possibly need different init functions. Internal code has been refactored, so that it can be shared between the DHKEM and other systems. Since DHKEM operates on low level keys it needs to be able to do low level ECDH and ECXDH calls without converting the keys back into EVP_PKEY/EVP_PKEY_CTX form. See ossl_ecx_compute_key(), ossl_ec_public_from_private() DHKEM requires API's to derive a key using a seed (IKM). This did not sit well inside the DHKEM itself as dispatch functions. This functionality fits better inside the EC and ECX keymanagers keygen, since they are just variations of keygen where the private key is generated in a different manner. This should mainly be used for testing purposes. See ossl_ec_generate_key_dhkem(). It supports this by allowing a settable param to be passed to keygen (See OSSL_PKEY_PARAM_DHKEM_IKM). The keygen calls code within ec and ecx dhkem implementation to handle this. See ossl_ecx_dhkem_derive_private() and ossl_ec_dhkem_derive_private(). These 2 functions are also used by the EC/ECX DHKEM implementations to generate the sender ephemeral keys. Reviewed-by: Hugo Landau <hlandau@openssl.org> Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/19068)
48 lines
2.0 KiB
C
48 lines
2.0 KiB
C
/*
|
|
* Copyright 2022 The OpenSSL Project Authors. All Rights Reserved.
|
|
*
|
|
* Licensed under the Apache License 2.0 (the "License"). You may not use
|
|
* this file except in compliance with the License. You can obtain a copy
|
|
* in the file LICENSE in the source distribution or at
|
|
* https://www.openssl.org/source/license.html
|
|
*/
|
|
|
|
#ifndef OSSL_CRYPTO_HPKE_H
|
|
# define OSSL_CRYPTO_HPKE_H
|
|
# pragma once
|
|
|
|
/* Constants from RFC 9180 Section 7.1 and 7.3 */
|
|
#define OSSL_HPKE_MAX_SECRET 64
|
|
#define OSSL_HPKE_MAX_PUBLIC 133
|
|
#define OSSL_HPKE_MAX_PRIVATE 66
|
|
#define OSSL_HPKE_MAX_NONCE 12
|
|
#define OSSL_HPKE_MAX_KDF_INPUTLEN 64
|
|
|
|
int ossl_hpke_kdf_extract(EVP_KDF_CTX *kctx,
|
|
unsigned char *prk, size_t prklen,
|
|
const unsigned char *salt, size_t saltlen,
|
|
const unsigned char *ikm, size_t ikmlen);
|
|
|
|
int ossl_hpke_kdf_expand(EVP_KDF_CTX *kctx,
|
|
unsigned char *okm, size_t okmlen,
|
|
const unsigned char *prk, size_t prklen,
|
|
const unsigned char *info, size_t infolen);
|
|
|
|
int ossl_hpke_labeled_extract(EVP_KDF_CTX *kctx,
|
|
unsigned char *prk, size_t prklen,
|
|
const unsigned char *salt, size_t saltlen,
|
|
const unsigned char *suiteid, size_t suiteidlen,
|
|
const char *label,
|
|
const unsigned char *ikm, size_t ikmlen);
|
|
int ossl_hpke_labeled_expand(EVP_KDF_CTX *kctx,
|
|
unsigned char *okm, size_t okmlen,
|
|
const unsigned char *prk, size_t prklen,
|
|
const unsigned char *suiteid, size_t suiteidlen,
|
|
const char *label,
|
|
const unsigned char *info, size_t infolen);
|
|
|
|
EVP_KDF_CTX *ossl_kdf_ctx_create(const char *kdfname, const char *mdname,
|
|
OSSL_LIB_CTX *libctx, const char *propq);
|
|
|
|
#endif
|