mirror of
https://github.com/yuzu-emu/mbedtls.git
synced 2024-11-23 16:45:43 +01:00
a5cedbcd3f
As has been previously done for ciphersuites, this commit introduces a zero-cost abstraction layer around the type mbedtls_md_info const * whose valid values represent implementations of message digest algorithms. Access to a particular digest implementation can be requested by name or digest ID through the API mbedtls_md_info_from_xxx(), which either returns a valid implementation or NULL, representing failure. This commit replaces such uses of `mbedtls_md_info const *` by an abstract type `mbedtls_md_handle_t` whose valid values represent digest implementations, and which has a designated invalid value MBEDTLS_MD_INVALID_HANDLE. The purpose of this abstraction layer is to pave the way for builds which support precisely one digest algorithm. In this case, mbedtls_md_handle_t can be implemented as a two-valued type, with one value representing the invalid handle, and the unique valid value representing the unique enabled digest.
278 lines
11 KiB
C
278 lines
11 KiB
C
/**
|
|
* \file ecjpake.h
|
|
*
|
|
* \brief Elliptic curve J-PAKE
|
|
*/
|
|
/*
|
|
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
* not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*
|
|
* This file is part of mbed TLS (https://tls.mbed.org)
|
|
*/
|
|
#ifndef MBEDTLS_ECJPAKE_H
|
|
#define MBEDTLS_ECJPAKE_H
|
|
|
|
/*
|
|
* J-PAKE is a password-authenticated key exchange that allows deriving a
|
|
* strong shared secret from a (potentially low entropy) pre-shared
|
|
* passphrase, with forward secrecy and mutual authentication.
|
|
* https://en.wikipedia.org/wiki/Password_Authenticated_Key_Exchange_by_Juggling
|
|
*
|
|
* This file implements the Elliptic Curve variant of J-PAKE,
|
|
* as defined in Chapter 7.4 of the Thread v1.0 Specification,
|
|
* available to members of the Thread Group http://threadgroup.org/
|
|
*
|
|
* As the J-PAKE algorithm is inherently symmetric, so is our API.
|
|
* Each party needs to send its first round message, in any order, to the
|
|
* other party, then each sends its second round message, in any order.
|
|
* The payloads are serialized in a way suitable for use in TLS, but could
|
|
* also be use outside TLS.
|
|
*/
|
|
#if !defined(MBEDTLS_CONFIG_FILE)
|
|
#include "config.h"
|
|
#else
|
|
#include MBEDTLS_CONFIG_FILE
|
|
#endif
|
|
|
|
#include "ecp.h"
|
|
#include "md.h"
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/**
|
|
* Roles in the EC J-PAKE exchange
|
|
*/
|
|
typedef enum {
|
|
MBEDTLS_ECJPAKE_CLIENT = 0, /**< Client */
|
|
MBEDTLS_ECJPAKE_SERVER, /**< Server */
|
|
} mbedtls_ecjpake_role;
|
|
|
|
#if !defined(MBEDTLS_ECJPAKE_ALT)
|
|
/**
|
|
* EC J-PAKE context structure.
|
|
*
|
|
* J-PAKE is a symmetric protocol, except for the identifiers used in
|
|
* Zero-Knowledge Proofs, and the serialization of the second message
|
|
* (KeyExchange) as defined by the Thread spec.
|
|
*
|
|
* In order to benefit from this symmetry, we choose a different naming
|
|
* convetion from the Thread v1.0 spec. Correspondance is indicated in the
|
|
* description as a pair C: client name, S: server name
|
|
*/
|
|
typedef struct mbedtls_ecjpake_context
|
|
{
|
|
mbedtls_md_handle_t md_info; /**< Hash to use */
|
|
mbedtls_ecp_group grp; /**< Elliptic curve */
|
|
mbedtls_ecjpake_role role; /**< Are we client or server? */
|
|
int point_format; /**< Format for point export */
|
|
|
|
mbedtls_ecp_point Xm1; /**< My public key 1 C: X1, S: X3 */
|
|
mbedtls_ecp_point Xm2; /**< My public key 2 C: X2, S: X4 */
|
|
mbedtls_ecp_point Xp1; /**< Peer public key 1 C: X3, S: X1 */
|
|
mbedtls_ecp_point Xp2; /**< Peer public key 2 C: X4, S: X2 */
|
|
mbedtls_ecp_point Xp; /**< Peer public key C: Xs, S: Xc */
|
|
|
|
mbedtls_mpi xm1; /**< My private key 1 C: x1, S: x3 */
|
|
mbedtls_mpi xm2; /**< My private key 2 C: x2, S: x4 */
|
|
|
|
mbedtls_mpi s; /**< Pre-shared secret (passphrase) */
|
|
} mbedtls_ecjpake_context;
|
|
|
|
#else /* MBEDTLS_ECJPAKE_ALT */
|
|
#include "ecjpake_alt.h"
|
|
#endif /* MBEDTLS_ECJPAKE_ALT */
|
|
|
|
/**
|
|
* \brief Initialize an ECJPAKE context.
|
|
*
|
|
* \param ctx The ECJPAKE context to initialize.
|
|
* This must not be \c NULL.
|
|
*/
|
|
void mbedtls_ecjpake_init( mbedtls_ecjpake_context *ctx );
|
|
|
|
/**
|
|
* \brief Set up an ECJPAKE context for use.
|
|
*
|
|
* \note Currently the only values for hash/curve allowed by the
|
|
* standard are #MBEDTLS_MD_SHA256/#MBEDTLS_ECP_DP_SECP256R1.
|
|
*
|
|
* \param ctx The ECJPAKE context to set up. This must be initialized.
|
|
* \param role The role of the caller. This must be either
|
|
* #MBEDTLS_ECJPAKE_CLIENT or #MBEDTLS_ECJPAKE_SERVER.
|
|
* \param hash The identifier of the hash function to use,
|
|
* for example #MBEDTLS_MD_SHA256.
|
|
* \param curve The identifier of the elliptic curve to use,
|
|
* for example #MBEDTLS_ECP_DP_SECP256R1.
|
|
* \param secret The pre-shared secret (passphrase). This must be
|
|
* a readable buffer of length \p len Bytes. It need
|
|
* only be valid for the duration of this call.
|
|
* \param len The length of the pre-shared secret \p secret.
|
|
*
|
|
* \return \c 0 if successful.
|
|
* \return A negative error code on failure.
|
|
*/
|
|
int mbedtls_ecjpake_setup( mbedtls_ecjpake_context *ctx,
|
|
mbedtls_ecjpake_role role,
|
|
mbedtls_md_type_t hash,
|
|
mbedtls_ecp_group_id curve,
|
|
const unsigned char *secret,
|
|
size_t len );
|
|
|
|
/**
|
|
* \brief Check if an ECJPAKE context is ready for use.
|
|
*
|
|
* \param ctx The ECJPAKE context to check. This must be
|
|
* initialized.
|
|
*
|
|
* \return \c 0 if the context is ready for use.
|
|
* \return #MBEDTLS_ERR_ECP_BAD_INPUT_DATA otherwise.
|
|
*/
|
|
int mbedtls_ecjpake_check( const mbedtls_ecjpake_context *ctx );
|
|
|
|
/**
|
|
* \brief Generate and write the first round message
|
|
* (TLS: contents of the Client/ServerHello extension,
|
|
* excluding extension type and length bytes).
|
|
*
|
|
* \param ctx The ECJPAKE context to use. This must be
|
|
* initialized and set up.
|
|
* \param buf The buffer to write the contents to. This must be a
|
|
* writable buffer of length \p len Bytes.
|
|
* \param len The length of \p buf in Bytes.
|
|
* \param olen The address at which to store the total number
|
|
* of Bytes written to \p buf. This must not be \c NULL.
|
|
* \param f_rng The RNG function to use. This must not be \c NULL.
|
|
* \param p_rng The RNG parameter to be passed to \p f_rng. This
|
|
* may be \c NULL if \p f_rng doesn't use a context.
|
|
*
|
|
* \return \c 0 if successful.
|
|
* \return A negative error code on failure.
|
|
*/
|
|
int mbedtls_ecjpake_write_round_one( mbedtls_ecjpake_context *ctx,
|
|
unsigned char *buf, size_t len, size_t *olen,
|
|
int (*f_rng)(void *, unsigned char *, size_t),
|
|
void *p_rng );
|
|
|
|
/**
|
|
* \brief Read and process the first round message
|
|
* (TLS: contents of the Client/ServerHello extension,
|
|
* excluding extension type and length bytes).
|
|
*
|
|
* \param ctx The ECJPAKE context to use. This must be initialized
|
|
* and set up.
|
|
* \param buf The buffer holding the first round message. This must
|
|
* be a readable buffer of length \p len Bytes.
|
|
* \param len The length in Bytes of \p buf.
|
|
*
|
|
* \return \c 0 if successful.
|
|
* \return A negative error code on failure.
|
|
*/
|
|
int mbedtls_ecjpake_read_round_one( mbedtls_ecjpake_context *ctx,
|
|
const unsigned char *buf,
|
|
size_t len );
|
|
|
|
/**
|
|
* \brief Generate and write the second round message
|
|
* (TLS: contents of the Client/ServerKeyExchange).
|
|
*
|
|
* \param ctx The ECJPAKE context to use. This must be initialized,
|
|
* set up, and already have performed round one.
|
|
* \param buf The buffer to write the round two contents to.
|
|
* This must be a writable buffer of length \p len Bytes.
|
|
* \param len The size of \p buf in Bytes.
|
|
* \param olen The address at which to store the total number of Bytes
|
|
* written to \p buf. This must not be \c NULL.
|
|
* \param f_rng The RNG function to use. This must not be \c NULL.
|
|
* \param p_rng The RNG parameter to be passed to \p f_rng. This
|
|
* may be \c NULL if \p f_rng doesn't use a context.
|
|
*
|
|
* \return \c 0 if successful.
|
|
* \return A negative error code on failure.
|
|
*/
|
|
int mbedtls_ecjpake_write_round_two( mbedtls_ecjpake_context *ctx,
|
|
unsigned char *buf, size_t len, size_t *olen,
|
|
int (*f_rng)(void *, unsigned char *, size_t),
|
|
void *p_rng );
|
|
|
|
/**
|
|
* \brief Read and process the second round message
|
|
* (TLS: contents of the Client/ServerKeyExchange).
|
|
*
|
|
* \param ctx The ECJPAKE context to use. This must be initialized
|
|
* and set up and already have performed round one.
|
|
* \param buf The buffer holding the second round message. This must
|
|
* be a readable buffer of length \p len Bytes.
|
|
* \param len The length in Bytes of \p buf.
|
|
*
|
|
* \return \c 0 if successful.
|
|
* \return A negative error code on failure.
|
|
*/
|
|
int mbedtls_ecjpake_read_round_two( mbedtls_ecjpake_context *ctx,
|
|
const unsigned char *buf,
|
|
size_t len );
|
|
|
|
/**
|
|
* \brief Derive the shared secret
|
|
* (TLS: Pre-Master Secret).
|
|
*
|
|
* \param ctx The ECJPAKE context to use. This must be initialized,
|
|
* set up and have performed both round one and two.
|
|
* \param buf The buffer to write the derived secret to. This must
|
|
* be a writable buffer of length \p len Bytes.
|
|
* \param len The length of \p buf in Bytes.
|
|
* \param olen The address at which to store the total number of Bytes
|
|
* written to \p buf. This must not be \c NULL.
|
|
* \param f_rng The RNG function to use. This must not be \c NULL.
|
|
* \param p_rng The RNG parameter to be passed to \p f_rng. This
|
|
* may be \c NULL if \p f_rng doesn't use a context.
|
|
*
|
|
* \return \c 0 if successful.
|
|
* \return A negative error code on failure.
|
|
*/
|
|
int mbedtls_ecjpake_derive_secret( mbedtls_ecjpake_context *ctx,
|
|
unsigned char *buf, size_t len, size_t *olen,
|
|
int (*f_rng)(void *, unsigned char *, size_t),
|
|
void *p_rng );
|
|
|
|
/**
|
|
* \brief This clears an ECJPAKE context and frees any
|
|
* embedded data structure.
|
|
*
|
|
* \param ctx The ECJPAKE context to free. This may be \c NULL,
|
|
* in which case this function does nothing. If it is not
|
|
* \c NULL, it must point to an initialized ECJPAKE context.
|
|
*/
|
|
void mbedtls_ecjpake_free( mbedtls_ecjpake_context *ctx );
|
|
|
|
#if defined(MBEDTLS_SELF_TEST)
|
|
|
|
/**
|
|
* \brief Checkup routine
|
|
*
|
|
* \return 0 if successful, or 1 if a test failed
|
|
*/
|
|
int mbedtls_ecjpake_self_test( int verbose );
|
|
|
|
#endif /* MBEDTLS_SELF_TEST */
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
|
|
#endif /* ecjpake.h */
|