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xmr: step_09_sign - unimport after heavy ops

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This commit is contained in:
Dusan Klinec 2018-11-02 07:25:12 +01:00
parent ddcb836ff7
commit cdf9d51ee2
No known key found for this signature in database
GPG Key ID: 6337E118CCBCE103
1 changed files with 16 additions and 7 deletions
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23
src/apps/monero/signing/step_09_sign_input.py
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@ -41,8 +41,6 @@ async def sign_input(
:param spend_enc: one time address spending private key. Encrypted. :param spend_enc: one time address spending private key. Encrypted.
:return: Generated signature MGs[i] :return: Generated signature MGs[i]
""" """
from apps.monero.signing import offloading_keys
await confirms.transaction_step( await confirms.transaction_step(
state.ctx, state.STEP_SIGN, state.current_input_index + 1, state.input_count state.ctx, state.STEP_SIGN, state.current_input_index + 1, state.input_count
) )
@ -58,8 +56,11 @@ async def sign_input(
raise ValueError("Two and more inputs must imply SimpleRCT") raise ValueError("Two and more inputs must imply SimpleRCT")
input_position = state.source_permutation[state.current_input_index] input_position = state.source_permutation[state.current_input_index]
mods = utils.unimport_begin()
# Check input's HMAC # Check input's HMAC
from apps.monero.signing import offloading_keys
vini_hmac_comp = await offloading_keys.gen_hmac_vini( vini_hmac_comp = await offloading_keys.gen_hmac_vini(
state.key_hmac, src_entr, vini_bin, input_position state.key_hmac, src_entr, vini_bin, input_position
) )
@ -69,6 +70,8 @@ async def sign_input(
gc.collect() gc.collect()
state.mem_trace(1, True) state.mem_trace(1, True)
from apps.monero.xmr.crypto import chacha_poly
if state.rct_type == RctType.Simple: if state.rct_type == RctType.Simple:
# both pseudo_out and its mask were offloaded so we need to # both pseudo_out and its mask were offloaded so we need to
# validate pseudo_out's HMAC and decrypt the alpha # validate pseudo_out's HMAC and decrypt the alpha
@ -81,8 +84,6 @@ async def sign_input(
state.mem_trace(2, True) state.mem_trace(2, True)
from apps.monero.xmr.crypto import chacha_poly
pseudo_out_alpha = crypto.decodeint( pseudo_out_alpha = crypto.decodeint(
chacha_poly.decrypt_pack( chacha_poly.decrypt_pack(
offloading_keys.enc_key_txin_alpha(state.key_enc, input_position), offloading_keys.enc_key_txin_alpha(state.key_enc, input_position),
@ -92,9 +93,6 @@ async def sign_input(
pseudo_out_c = crypto.decodepoint(pseudo_out) pseudo_out_c = crypto.decodepoint(pseudo_out)
# Spending secret # Spending secret
from apps.monero.xmr.crypto import chacha_poly
from apps.monero.xmr.serialize_messages.ct_keys import CtKey
spend_key = crypto.decodeint( spend_key = crypto.decodeint(
chacha_poly.decrypt_pack( chacha_poly.decrypt_pack(
offloading_keys.enc_key_spend(state.key_enc, input_position), offloading_keys.enc_key_spend(state.key_enc, input_position),
@ -102,8 +100,19 @@ async def sign_input(
) )
) )
del (
offloading_keys,
chacha_poly,
pseudo_out,
pseudo_out_hmac,
pseudo_out_alpha_enc,
spend_enc,
)
utils.unimport_end(mods)
state.mem_trace(3, True) state.mem_trace(3, True)
from apps.monero.xmr.serialize_messages.ct_keys import CtKey
# Basic setup, sanity check # Basic setup, sanity check
index = src_entr.real_output index = src_entr.real_output
input_secret_key = CtKey(dest=spend_key, mask=crypto.decodeint(src_entr.mask)) input_secret_key = CtKey(dest=spend_key, mask=crypto.decodeint(src_entr.mask))