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Implement HKDF

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This commit is contained in:
Matthias Schiffer 2013-10-31 23:11:00 +01:00
parent 66a953a83f
commit 542861816d
4 changed files with 98 additions and 1 deletions
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1
src/CMakeLists.txt
View file

@ -18,6 +18,7 @@ add_executable(fastd
crypto.c
crypto_linux.c
handshake.c
hkdf_sha256.c
lex.c
options.c
peer.c

6
src/fastd.h
View file

@ -407,8 +407,12 @@ static inline int fastd_rand(fastd_context_t *ctx, int min, int max) {
(type *)( (char *)__mptr - offsetof(type,member) );})
static inline size_t block_count(size_t l, size_t a) {
return (l+a-1)/a;
}
static inline size_t alignto(size_t l, size_t a) {
return ((l+a-1)/a)*a;
return block_count(l, a)*a;
}
static inline fastd_buffer_t fastd_buffer_alloc(const fastd_context_t *ctx, size_t len, size_t head_space, size_t tail_space) {

53
src/hkdf_sha256.c Normal file
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@ -0,0 +1,53 @@
/*
Copyright (c) 2012-2013, Matthias Schiffer <mschiffer@universe-factory.net>
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "hkdf_sha256.h"
#include <string.h>
void fastd_hkdf_sha256_expand(fastd_sha256_t *out, size_t blocks, fastd_sha256_t *prk, const uint8_t *info, size_t infolen) {
if (!blocks)
return;
size_t len = sizeof(fastd_sha256_t) + infolen + 1;
uint8_t buf[len] __attribute__((align(4)));
memset(buf, 0, sizeof(fastd_sha256_t));
memcpy(buf+sizeof(fastd_sha256_t), info, infolen);
buf[len-1] = 0x01;
fastd_hmacsha256(out, prk->w, (uint32_t*)(buf+sizeof(fastd_sha256_t)), infolen + 1);
while (--blocks) {
memcpy(buf, out, sizeof(fastd_sha256_t));
out++;
buf[len-1]++;
fastd_hmacsha256(out, prk->w, (uint32_t*)buf, len);
}
}

39
src/hkdf_sha256.h Normal file
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@ -0,0 +1,39 @@
/*
Copyright (c) 2012-2013, Matthias Schiffer <mschiffer@universe-factory.net>
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _FASTD_HKDF_SHA256_H_
#define _FASTD_HKDF_SHA256_H_
#include "sha256.h"
static inline void fastd_hkdf_sha256_extract(fastd_sha256_t *out, const uint32_t salt[FASTD_HMACSHA256_KEY_WORDS], const uint32_t *in, size_t len) {
fastd_hmacsha256(out, salt, in, len);
}
void fastd_hkdf_sha256_expand(fastd_sha256_t *out, size_t blocks, fastd_sha256_t *prk, const uint8_t *info, size_t infolen);
#endif /* _FASTD_HKDF_SHA256_H_ */