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Remove elliptic curve stubs from gcrypt/, add PRF implementation.

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This commit is contained in:
Guus Sliepen 2016-04-11 15:27:08 +02:00
parent 20dd1c21dc
commit 9ba3e95a9a
4 changed files with 81 additions and 149 deletions
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37
src/gcrypt/ecdh.c
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@ -1,37 +0,0 @@
/*
ecdh.c -- Diffie-Hellman key exchange handling
Copyright (C) 2011-2013 Guus Sliepen <guus@tinc-vpn.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "../system.h"
#include "../ecdh.h"
#include "../logger.h"
#include "../utils.h"
#include "../xalloc.h"
ecdh_t *ecdh_generate_public(void *pubkey) {
logger(DEBUG_ALWAYS, LOG_ERR, "EC support using libgcrypt not implemented");
return NULL;
}
bool ecdh_compute_shared(ecdh_t *ecdh, const void *pubkey, void *shared) {
return false
}
void ecdh_free(ecdh_t *ecdh) {
}

67
src/gcrypt/ecdsa.c
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@ -1,67 +0,0 @@
/*
ecdsa.c -- ECDSA key handling
Copyright (C) 2011-2013 Guus Sliepen <guus@tinc-vpn.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "../system.h"
#include "../logger.h"
#include "../ecdsa.h"
#include "../utils.h"
#include "../xalloc.h"
// Get and set ECDSA keys
//
ecdsa_t *ecdsa_set_base64_public_key(const char *p) {
logger(DEBUG_ALWAYS, LOG_ERR, "EC support using libgcrypt not implemented");
return NULL;
}
char *ecdsa_get_base64_public_key(ecdsa_t *ecdsa) {
return NULL;
}
// Read PEM ECDSA keys
ecdsa_t *ecdsa_read_pem_public_key(FILE *fp) {
logger(DEBUG_ALWAYS, LOG_ERR, "EC support using libgcrypt not implemented");
return NULL;
}
ecdsa_t *ecdsa_read_pem_private_key(FILE *fp) {
logger(DEBUG_ALWAYS, LOG_ERR, "EC support using libgcrypt not implemented");
return NULL;
}
size_t ecdsa_size(ecdsa_t *ecdsa) {
return 0;
}
bool ecdsa_sign(ecdsa_t *ecdsa, const void *in, size_t len, void *sig) {
return false;
}
bool ecdsa_verify(ecdsa_t *ecdsa, const void *in, size_t len, const void *sig) {
return false;
}
bool ecdsa_active(ecdsa_t *ecdsa) {
return false;
}
void ecdsa_free(ecdsa_t *ecdsa) {
}

41
src/gcrypt/ecdsagen.c
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@ -1,41 +0,0 @@
/*
ecdsagen.c -- ECDSA key generation and export
Copyright (C) 2011-2013 Guus Sliepen <guus@tinc-vpn.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "../system.h"
#include "../ecdsagen.h"
#include "../utils.h"
#include "../xalloc.h"
// Generate ECDSA key
ecdsa_t *ecdsa_generate(void) {
logger(DEBUG_ALWAYS, LOG_ERR, "EC support using libgcrypt not implemented");
return NULL;
}
// Write PEM ECDSA keys
bool ecdsa_write_pem_public_key(ecdsa_t *ecdsa, FILE *fp) {
return false;
}
bool ecdsa_write_pem_private_key(ecdsa_t *ecdsa, FILE *fp) {
return false;
}

85
src/gcrypt/prf.c
View file

@ -19,11 +19,88 @@
#include "../system.h"
#include "digest.h"
#include "../digest.h"
#include "../prf.h"
#include "../ed25519/sha512.h"
static void memxor(char *buf, char c, size_t len) {
for(size_t i = 0; i < len; i++)
buf[i] ^= c;
}
static const size_t mdlen = 64;
static const size_t blklen = 128;
static bool hmac_sha512(const char *key, size_t keylen, const char *msg, size_t msglen, char *out) {
char tmp[blklen + mdlen];
sha512_context md;
if(keylen <= blklen) {
memcpy(tmp, key, keylen);
memset(tmp + keylen, 0, blklen - keylen);
} else {
if(sha512(key, keylen, tmp) != 0)
return false;
memset(tmp + mdlen, 0, blklen - mdlen);
}
if(sha512_init(&md) != 0)
return false;
// ipad
memxor(tmp, 0x36, blklen);
if(sha512_update(&md, tmp, blklen) != 0)
return false;
// message
if(sha512_update(&md, msg, msglen) != 0)
return false;
if(sha512_final(&md, tmp + blklen) != 0)
return false;
// opad
memxor(tmp, 0x36 ^ 0x5c, blklen);
if(sha512(tmp, sizeof tmp, out) != 0)
return false;
return true;
}
/* Generate key material from a master secret and a seed, based on RFC 4346 section 5.
We use SHA512 instead of MD5 and SHA1.
*/
bool prf(const char *secret, size_t secretlen, char *seed, size_t seedlen, char *out, size_t outlen) {
logger(DEBUG_ALWAYS, LOG_ERR, "PRF support using libgcrypt not implemented");
return false;
/* Data is what the "inner" HMAC function processes.
It consists of the previous HMAC result plus the seed.
*/
char data[mdlen + seedlen];
memset(data, 0, mdlen);
memcpy(data + mdlen, seed, seedlen);
char hash[mdlen];
while(outlen > 0) {
/* Inner HMAC */
if(!hmac_sha512(secret, secretlen, data, sizeof data, data))
return false;
/* Outer HMAC */
if(outlen >= mdlen) {
if(!hmac_sha512(secret, secretlen, data, sizeof data, out))
return false;
out += mdlen;
outlen -= mdlen;
} else {
if(!hmac_sha512(secret, secretlen, data, sizeof data, hash))
return false;
memcpy(out, hash, outlen);
out += outlen;
outlen = 0;
}
}
return true;
}