185 lines
6.5 KiB
C
185 lines
6.5 KiB
C
/*
|
|
* Copyright (c) 2018 Thomas Pornin <pornin@bolet.org>
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining
|
|
* a copy of this software and associated documentation files (the
|
|
* "Software"), to deal in the Software without restriction, including
|
|
* without limitation the rights to use, copy, modify, merge, publish,
|
|
* distribute, sublicense, and/or sell copies of the Software, and to
|
|
* permit persons to whom the Software is furnished to do so, subject to
|
|
* the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be
|
|
* included in all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
|
|
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
|
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
* SOFTWARE.
|
|
*/
|
|
|
|
#ifndef BR_BEARSSL_KDF_H__
|
|
#define BR_BEARSSL_KDF_H__
|
|
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
|
|
#include "bearssl_hash.h"
|
|
#include "bearssl_hmac.h"
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/** \file bearssl_kdf.h
|
|
*
|
|
* # Key Derivation Functions
|
|
*
|
|
* KDF are functions that takes a variable length input, and provide a
|
|
* variable length output, meant to be used to derive subkeys from a
|
|
* master key.
|
|
*
|
|
* ## HKDF
|
|
*
|
|
* HKDF is a KDF defined by [RFC 5869](https://tools.ietf.org/html/rfc5869).
|
|
* It is based on HMAC, itself using an underlying hash function. Any
|
|
* hash function can be used, as long as it is compatible with the rules
|
|
* for the HMAC implementation (i.e. output size is 64 bytes or less, hash
|
|
* internal state size is 64 bytes or less, and the internal block length is
|
|
* a power of 2 between 16 and 256 bytes). HKDF has two phases:
|
|
*
|
|
* - HKDF-Extract: the input data in ingested, along with a "salt" value.
|
|
*
|
|
* - HKDF-Expand: the output is produced, from the result of processing
|
|
* the input and salt, and using an extra non-secret parameter called
|
|
* "info".
|
|
*
|
|
* The "salt" and "info" strings are non-secret and can be empty. Their role
|
|
* is normally to bind the input and output, respectively, to conventional
|
|
* identifiers that qualifu them within the used protocol or application.
|
|
*
|
|
* The implementation defined in this file uses the following functions:
|
|
*
|
|
* - `br_hkdf_init()`: initialize an HKDF context, with a hash function,
|
|
* and the salt. This starts the HKDF-Extract process.
|
|
*
|
|
* - `br_hkdf_inject()`: inject more input bytes. This function may be
|
|
* called repeatedly if the input data is provided by chunks.
|
|
*
|
|
* - `br_hkdf_flip()`: end the HKDF-Extract process, and start the
|
|
* HKDF-Expand process.
|
|
*
|
|
* - `br_hkdf_produce()`: get the next bytes of output. This function
|
|
* may be called several times to obtain the full output by chunks.
|
|
* For correct HKDF processing, the same "info" string must be
|
|
* provided for each call.
|
|
*
|
|
* Note that the HKDF total output size (the number of bytes that
|
|
* HKDF-Expand is willing to produce) is limited: if the hash output size
|
|
* is _n_ bytes, then the maximum output size is _255*n_.
|
|
*/
|
|
|
|
/**
|
|
* \brief HKDF context.
|
|
*
|
|
* The HKDF context is initialized with a hash function implementation
|
|
* and a salt value. Contents are opaque (callers should not access them
|
|
* directly). The caller is responsible for allocating the context where
|
|
* appropriate. Context initialisation and usage incurs no dynamic
|
|
* allocation, so there is no release function.
|
|
*/
|
|
typedef struct {
|
|
#ifndef BR_DOXYGEN_IGNORE
|
|
union {
|
|
br_hmac_context hmac_ctx;
|
|
br_hmac_key_context prk_ctx;
|
|
} u;
|
|
unsigned char buf[64];
|
|
size_t ptr;
|
|
size_t dig_len;
|
|
unsigned chunk_num;
|
|
#endif
|
|
} br_hkdf_context;
|
|
|
|
/**
|
|
* \brief HKDF context initialization.
|
|
*
|
|
* The underlying hash function and salt value are provided. Arbitrary
|
|
* salt lengths can be used.
|
|
*
|
|
* HKDF makes a difference between a salt of length zero, and an
|
|
* absent salt (the latter being equivalent to a salt consisting of
|
|
* bytes of value zero, of the same length as the hash function output).
|
|
* If `salt_len` is zero, then this function assumes that the salt is
|
|
* present but of length zero. To specify an _absent_ salt, use
|
|
* `BR_HKDF_NO_SALT` as `salt` parameter (`salt_len` is then ignored).
|
|
*
|
|
* \param hc HKDF context to initialise.
|
|
* \param digest_vtable pointer to the hash function implementation vtable.
|
|
* \param salt HKDF-Extract salt.
|
|
* \param salt_len HKDF-Extract salt length (in bytes).
|
|
*/
|
|
void br_hkdf_init(br_hkdf_context *hc, const br_hash_class *digest_vtable,
|
|
const void *salt, size_t salt_len);
|
|
|
|
/**
|
|
* \brief The special "absent salt" value for HKDF.
|
|
*/
|
|
#define BR_HKDF_NO_SALT (&br_hkdf_no_salt)
|
|
|
|
#ifndef BR_DOXYGEN_IGNORE
|
|
extern const unsigned char br_hkdf_no_salt;
|
|
#endif
|
|
|
|
/**
|
|
* \brief HKDF input injection (HKDF-Extract).
|
|
*
|
|
* This function injects some more input bytes ("key material") into
|
|
* HKDF. This function may be called several times, after `br_hkdf_init()`
|
|
* but before `br_hkdf_flip()`.
|
|
*
|
|
* \param hc HKDF context.
|
|
* \param ikm extra input bytes.
|
|
* \param ikm_len number of extra input bytes.
|
|
*/
|
|
void br_hkdf_inject(br_hkdf_context *hc, const void *ikm, size_t ikm_len);
|
|
|
|
/**
|
|
* \brief HKDF switch to the HKDF-Expand phase.
|
|
*
|
|
* This call terminates the HKDF-Extract process (input injection), and
|
|
* starts the HKDF-Expand process (output production).
|
|
*
|
|
* \param hc HKDF context.
|
|
*/
|
|
void br_hkdf_flip(br_hkdf_context *hc);
|
|
|
|
/**
|
|
* \brief HKDF output production (HKDF-Expand).
|
|
*
|
|
* Produce more output bytes from the current state. This function may be
|
|
* called several times, but only after `br_hkdf_flip()`.
|
|
*
|
|
* Returned value is the number of actually produced bytes. The total
|
|
* output length is limited to 255 times the output length of the
|
|
* underlying hash function.
|
|
*
|
|
* \param hc HKDF context.
|
|
* \param info application specific information string.
|
|
* \param info_len application specific information string length (in bytes).
|
|
* \param out destination buffer for the HKDF output.
|
|
* \param out_len the length of the requested output (in bytes).
|
|
* \return the produced output length (in bytes).
|
|
*/
|
|
size_t br_hkdf_produce(br_hkdf_context *hc,
|
|
const void *info, size_t info_len, void *out, size_t out_len);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|