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crypto: make secret_key automatically mlock

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moneromooo-monero 2018-07-15 14:33:48 +01:00
parent 70271fa788
commit ab74dc277a
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GPG Key ID: 686F07454D6CEFC3
5 changed files with 12 additions and 10 deletions
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11
src/crypto/chacha.h
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@ -40,6 +40,7 @@
#include <memory.h>
#include "memwipe.h"
#include "mlocker.h"
#include "hash.h"
namespace crypto {
@ -50,7 +51,7 @@ namespace crypto {
#if defined(__cplusplus)
}
using chacha_key = tools::scrubbed_arr<uint8_t, CHACHA_KEY_SIZE>;
using chacha_key = epee::mlocked<tools::scrubbed_arr<uint8_t, CHACHA_KEY_SIZE>>;
#pragma pack(push, 1)
// MS VC 2012 doesn't interpret `class chacha_iv` as POD in spite of [9.0.10], so it is a struct
@ -71,20 +72,20 @@ namespace crypto {
inline void generate_chacha_key(const void *data, size_t size, chacha_key& key, uint64_t kdf_rounds) {
static_assert(sizeof(chacha_key) <= sizeof(hash), "Size of hash must be at least that of chacha_key");
tools::scrubbed_arr<char, HASH_SIZE> pwd_hash;
epee::mlocked<tools::scrubbed_arr<char, HASH_SIZE>> pwd_hash;
crypto::cn_slow_hash(data, size, pwd_hash.data(), 0/*variant*/, 0/*prehashed*/);
for (uint64_t n = 1; n < kdf_rounds; ++n)
crypto::cn_slow_hash(pwd_hash.data(), pwd_hash.size(), pwd_hash.data(), 0/*variant*/, 0/*prehashed*/);
memcpy(&unwrap(key), pwd_hash.data(), sizeof(key));
memcpy(&unwrap(unwrap(key)), pwd_hash.data(), sizeof(key));
}
inline void generate_chacha_key_prehashed(const void *data, size_t size, chacha_key& key, uint64_t kdf_rounds) {
static_assert(sizeof(chacha_key) <= sizeof(hash), "Size of hash must be at least that of chacha_key");
tools::scrubbed_arr<char, HASH_SIZE> pwd_hash;
epee::mlocked<tools::scrubbed_arr<char, HASH_SIZE>> pwd_hash;
crypto::cn_slow_hash(data, size, pwd_hash.data(), 0/*variant*/, 1/*prehashed*/);
for (uint64_t n = 1; n < kdf_rounds; ++n)
crypto::cn_slow_hash(pwd_hash.data(), pwd_hash.size(), pwd_hash.data(), 0/*variant*/, 0/*prehashed*/);
memcpy(&unwrap(key), pwd_hash.data(), sizeof(key));
memcpy(&unwrap(unwrap(key)), pwd_hash.data(), sizeof(key));
}
inline void generate_chacha_key(std::string password, chacha_key& key, uint64_t kdf_rounds) {

3
src/crypto/crypto.h
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@ -41,6 +41,7 @@
#include "common/pod-class.h"
#include "common/util.h"
#include "memwipe.h"
#include "mlocker.h"
#include "generic-ops.h"
#include "hex.h"
#include "span.h"
@ -65,7 +66,7 @@ namespace crypto {
friend class crypto_ops;
};
using secret_key = tools::scrubbed<ec_scalar>;
using secret_key = epee::mlocked<tools::scrubbed<ec_scalar>>;
POD_CLASS public_keyV {
std::vector<public_key> keys;

4
src/cryptonote_basic/account.cpp
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@ -67,7 +67,7 @@ DISABLE_VS_WARNINGS(4244 4345)
static void derive_key(const crypto::chacha_key &base_key, crypto::chacha_key &key)
{
static_assert(sizeof(base_key) == sizeof(crypto::hash), "chacha key and hash should be the same size");
tools::scrubbed_arr<char, sizeof(base_key)+1> data;
epee::mlocked<tools::scrubbed_arr<char, sizeof(base_key)+1>> data;
memcpy(data.data(), &base_key, sizeof(base_key));
data[sizeof(base_key)] = KEYS_ENCRYPTION_SALT;
crypto::generate_chacha_key(data.data(), sizeof(data), key, 1);
@ -223,7 +223,7 @@ DISABLE_VS_WARNINGS(4244 4345)
void account_base::create_from_viewkey(const cryptonote::account_public_address& address, const crypto::secret_key& viewkey)
{
crypto::secret_key fake;
memset(&unwrap(fake), 0, sizeof(fake));
memset(&unwrap(unwrap(fake)), 0, sizeof(fake));
create_from_keys(address, fake, viewkey);
}
//-----------------------------------------------------------------

2
src/device/device_default.cpp
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@ -103,7 +103,7 @@ namespace hw {
bool device_default::generate_chacha_key(const cryptonote::account_keys &keys, crypto::chacha_key &key, uint64_t kdf_rounds) {
const crypto::secret_key &view_key = keys.m_view_secret_key;
const crypto::secret_key &spend_key = keys.m_spend_secret_key;
tools::scrubbed_arr<char, sizeof(view_key) + sizeof(spend_key) + 1> data;
epee::mlocked<tools::scrubbed_arr<char, sizeof(view_key) + sizeof(spend_key) + 1>> data;
memcpy(data.data(), &view_key, sizeof(view_key));
memcpy(data.data() + sizeof(view_key), &spend_key, sizeof(spend_key));
data[sizeof(data) - 1] = CHACHA8_KEY_TAIL;

2
src/wallet/wallet2.cpp
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@ -2963,7 +2963,7 @@ void wallet2::setup_keys(const epee::wipeable_string &password)
}
static_assert(HASH_SIZE == sizeof(crypto::chacha_key), "Mismatched sizes of hash and chacha key");
tools::scrubbed_arr<char, HASH_SIZE+1> cache_key_data;
epee::mlocked<tools::scrubbed_arr<char, HASH_SIZE+1>> cache_key_data;
memcpy(cache_key_data.data(), &key, HASH_SIZE);
cache_key_data[HASH_SIZE] = CACHE_KEY_TAIL;
cn_fast_hash(cache_key_data.data(), HASH_SIZE+1, (crypto::hash&)m_cache_key);