GNUnet  0.11.x
crypto_pow.c
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1 /*
2  This file is part of GNUnet.
3  Copyright (C) 2012, 2013, 2019 GNUnet e.V.
4 
5  GNUnet is free software: you can redistribute it and/or modify it
6  under the terms of the GNU Affero General Public License as published
7  by the Free Software Foundation, either version 3 of the License,
8  or (at your option) any later version.
9 
10  GNUnet is distributed in the hope that it will be useful, but
11  WITHOUT ANY WARRANTY; without even the implied warranty of
12  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  Affero General Public License for more details.
14 
15  You should have received a copy of the GNU Affero General Public License
16  along with this program. If not, see <http://www.gnu.org/licenses/>.
17 
18  SPDX-License-Identifier: AGPL3.0-or-later
19  */
26 #include "platform.h"
27 #include "gnunet_crypto_lib.h"
28 #include <gcrypt.h>
29 
40 void
41 GNUNET_CRYPTO_pow_hash (const char *salt,
42  const void *buf,
43  size_t buf_len,
44  struct GNUNET_HashCode *result)
45 {
46 #ifdef LSD001
47  char twofish_iv[128 / 8]; //128 bit IV
48  char twofish_key[256 / 8]; //256 bit Key
49  char rbuf[buf_len];
50  int rc;
51  gcry_cipher_hd_t handle;
52 
53  GNUNET_break (0 == gcry_kdf_derive (buf,
54  buf_len,
55  GCRY_KDF_SCRYPT,
56  1 /* subalgo */,
57  salt,
58  strlen (salt),
59  2 /* iterations; keep cost of individual op small */,
60  sizeof(twofish_key),
61  &twofish_key));
62 
63  GNUNET_CRYPTO_kdf (twofish_iv,
64  sizeof (twofish_iv),
65  "gnunet-proof-of-work-iv",
66  strlen ("gnunet-proof-of-work-iv"),
67  twofish_key,
68  sizeof(twofish_key),
69  salt,
70  strlen (salt),
71  NULL, 0);
72  GNUNET_assert (0 ==
73  gcry_cipher_open (&handle, GCRY_CIPHER_TWOFISH,
74  GCRY_CIPHER_MODE_CFB, 0));
75  rc = gcry_cipher_setkey (handle,
76  twofish_key,
77  sizeof(twofish_key));
78  GNUNET_assert ((0 == rc) || ((char) rc == GPG_ERR_WEAK_KEY));
79  rc = gcry_cipher_setiv (handle,
80  twofish_iv,
81  sizeof(twofish_iv));
82  GNUNET_assert ((0 == rc) || ((char) rc == GPG_ERR_WEAK_KEY));
83  GNUNET_assert (0 == gcry_cipher_encrypt (handle, &rbuf, buf_len, buf, buf_len));
84  gcry_cipher_close (handle);
85 #else
86  struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
87  struct GNUNET_CRYPTO_SymmetricSessionKey skey;
88  char rbuf[buf_len];
89 
90  GNUNET_break (0 == gcry_kdf_derive (buf,
91  buf_len,
92  GCRY_KDF_SCRYPT,
93  1 /* subalgo */,
94  salt,
95  strlen (salt),
96  2 /* iterations; keep cost of individual op small */,
97  sizeof(skey),
98  &skey));
99  GNUNET_CRYPTO_symmetric_derive_iv (&iv,
100  &skey,
101  "gnunet-proof-of-work-iv",
102  strlen ("gnunet-proof-of-work-iv"),
103  salt,
104  strlen (salt),
105  NULL, 0);
106  GNUNET_CRYPTO_symmetric_encrypt (buf,
107  buf_len,
108  &skey,
109  &iv,
110  &rbuf);
111 #endif
112  GNUNET_break (0 == gcry_kdf_derive (rbuf,
113  buf_len,
114  GCRY_KDF_SCRYPT,
115  1 /* subalgo */,
116  salt,
117  strlen (salt),
118  2 /* iterations; keep cost of individual op small */,
119  sizeof(struct GNUNET_HashCode),
120  result));
121 }
122 
123 
124 /* end of crypto_pow.c */
GNUNET_CRYPTO_pow_hash
void GNUNET_CRYPTO_pow_hash(const char *salt, const void *buf, size_t buf_len, struct GNUNET_HashCode *result)
Calculate the &#39;proof-of-work&#39; hash (an expensive hash).
Definition: crypto_pow.c:41
GNUNET_assert
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
Definition: gnunet_common.h:837
GNUNET_break
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
Definition: gnunet_common.h:896
gnunet_crypto_lib.h
cryptographic primitives for GNUnet
GNUNET_CRYPTO_SymmetricSessionKey
type for session keys
Definition: gnunet_crypto_lib.h:279
GNUNET_CRYPTO_symmetric_encrypt
ssize_t GNUNET_CRYPTO_symmetric_encrypt(const void *block, size_t size, const struct GNUNET_CRYPTO_SymmetricSessionKey *sessionkey, const struct GNUNET_CRYPTO_SymmetricInitializationVector *iv, void *result)
Encrypt a block using a symmetric sessionkey.
Definition: crypto_symmetric.c:130
GNUNET_CRYPTO_symmetric_derive_iv
void GNUNET_CRYPTO_symmetric_derive_iv(struct GNUNET_CRYPTO_SymmetricInitializationVector *iv, const struct GNUNET_CRYPTO_SymmetricSessionKey *skey, const void *salt, size_t salt_len,...)
Derive an IV.
Definition: crypto_symmetric.c:202
buf
static char buf[2048]
Definition: gnunet-service-testbed_meminfo.c:64
handle
static struct GNUNET_DNS_Handle * handle
Handle to transport service.
Definition: gnunet-dns-monitor.c:35
result
static int result
Global testing status.
Definition: gnunet-regex-profiler.c:244
GNUNET_HashCode
A 512-bit hashcode.
Definition: gnunet_common.h:237
GNUNET_CRYPTO_SymmetricInitializationVector
IV for sym cipher.
Definition: gnunet_crypto_lib.h:300
GNUNET_CRYPTO_kdf
int GNUNET_CRYPTO_kdf(void *result, size_t out_len, const void *xts, size_t xts_len, const void *skm, size_t skm_len,...)
Derive key.
Definition: crypto_kdf.c:89
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