def new_masterkey(passphrase,
rand=Random(),
get_time=time.time,
nb_iterations_test=25000):
"""Create a new masterkey"""
crypter = Crypter()
plain_master_key = rand.get_random_bytes(WALLET_CRYPTO_KEY_SIZE)
rand.add_system_seeds()
salt = rand.get_random_bytes(WALLET_CRYPTO_SALT_SIZE)
deriv_method = MasterKey.DERIVMETHOD_EVP_SHA512
target_seconds = 0.1 #100ms
# estimate number of derivations for 100ms per decrypt using 25000 iterations.
start_time = get_time()
derive_key_from_passphrase(passphrase, salt, nb_iterations_test,
deriv_method)
estimate1 = int((nb_iterations_test * 1.0 * target_seconds) /
(get_time() - start_time))
# try it and take the mean of the estimate1 and estimate2
start_time = get_time()
derive_key_from_passphrase(passphrase, salt, estimate1, deriv_method)
estimate2 = int(estimate1 * target_seconds / (get_time() - start_time))
deriv_iterations = (estimate1 + estimate2) / 2
# use it
key, init_vect = derive_key_from_passphrase(passphrase, salt,
deriv_iterations, deriv_method)
crypter.set_key(key, init_vect)
crypted_key = crypter.encrypt(plain_master_key)
return MasterKey(crypted_key, salt, deriv_method, deriv_iterations)
def create(self, passphrase):
self.wallet_database.begin_updates()
crypter = Crypter()
#first create masterkey
master_key = new_masterkey(passphrase)
plain_masterkey = decrypt_masterkey(master_key, passphrase)
self.wallet_database.add_master_key(master_key)
#create transaction pool
for i in range(100):
k = KEY()
k.generate(True)
public_key = k.get_pubkey()
crypter.set_key(plain_masterkey, doublesha256(public_key))
crypted_secret = crypter.encrypt(k.get_secret())
self.wallet_database.add_crypted_key(public_key, crypted_secret)
pool_key = WalletPoolKey(i, 60000, time.time(), public_key)
self.wallet_database.add_poolkey(pool_key)
self.wallet_database.commit_updates()
self.load()
def create(self, passphrase):
self.wallet_database.begin_updates()
crypter = Crypter()
#first create masterkey
master_key = new_masterkey(passphrase)
plain_masterkey = decrypt_masterkey(master_key, passphrase)
self.wallet_database.add_master_key(master_key)
#create transaction pool
for i in range(100):
k = KEY()
k.generate(True)
public_key = k.get_pubkey()
crypter.set_key(plain_masterkey, doublesha256(public_key))
crypted_secret = crypter.encrypt(k.get_secret())
self.wallet_database.add_crypted_key(public_key, crypted_secret)
pool_key = WalletPoolKey(i, 60000, time.time(), public_key)
self.wallet_database.add_poolkey(pool_key)
self.wallet_database.commit_updates()
self.load()
def new_masterkey(passphrase, rand=Random(), get_time=time.time, nb_iterations_test=25000):
"""Create a new masterkey"""
crypter = Crypter()
plain_master_key = rand.get_random_bytes(WALLET_CRYPTO_KEY_SIZE)
rand.add_system_seeds()
salt = rand.get_random_bytes(WALLET_CRYPTO_SALT_SIZE)
deriv_method = MasterKey.DERIVMETHOD_EVP_SHA512
target_seconds = 0.1 #100ms
# estimate number of derivations for 100ms per decrypt using 25000 iterations.
start_time = get_time()
derive_key_from_passphrase(passphrase, salt, nb_iterations_test, deriv_method)
estimate1 = int((nb_iterations_test * 1.0 * target_seconds) / (get_time() - start_time))
# try it and take the mean of the estimate1 and estimate2
start_time = get_time()
derive_key_from_passphrase(passphrase, salt, estimate1, deriv_method)
estimate2 = int(estimate1 * target_seconds / (get_time() - start_time))
deriv_iterations = (estimate1 + estimate2) / 2
# use it
key, init_vect = derive_key_from_passphrase(passphrase, salt, deriv_iterations, deriv_method)
crypter.set_key(key, init_vect)
crypted_key = crypter.encrypt(plain_master_key)
return MasterKey(crypted_key, salt, deriv_method, deriv_iterations)
