Add test to sign 400 different PSBTs in one session

(cherry picked from commit ced5f068b1)

shared/history.py

@@ -3,7 +3,6 @@
 # history.py - store some history about past transactions and/or outputs they involved
 #
 import gc, chains
-from utils import B2A
 from uhashlib import sha256
 from ustruct import pack, unpack
 from exceptions import IncorrectUTXOAmount

shared/hsm.py

@@ -430,7 +430,7 @@ class AuditLogger:
 
             self.card = CardSlot().__enter__()
 
-            d  = self.card.get_sd_root() + '/' + self.dirname
+            d = self.card.get_sd_root() + '/' + self.dirname
 
             # mkdir if needed
             try: uos.stat(d)
@@ -667,7 +667,6 @@ class HSMPolicy:
     def activate(self, new_file):
         # user approved the HSM activation, so apply it.
         from glob import dis
-        from pincodes import pa
 
         import glob
         assert not glob.hsm_active

testing/test_hsm.py

@@ -8,6 +8,9 @@
 # - set coldcard for testnet chain
 # - command line: py.test test_hsm.py --dev -s --ff
 # - no microSD card installed
+# For testing on a REAL Coldcard Mk4:
+# - create development firmware via `make dev`
+# - enable HSM commands in `Advanced/Tools -> Enable HSM -> Enable`
 #
 import pytest, time, itertools, base64, re, json, struct
 from collections import OrderedDict
@@ -757,6 +760,22 @@ def test_big_txn(num_in, num_out, dev, quick_start_hsm, hsm_status, is_simulator
         attempt_psbt(psbt)
 
 
+@pytest.mark.veryslow
+def test_multiple_signings(dev, quick_start_hsm, is_simulator,
+                           attempt_psbt, fake_txn, load_hsm_users,
+                           auth_user):
+    # signs 400 different PSBTs in loop
+    policy = DICT(warnings_ok=True, must_log=1, rules=[dict(users=['pw'])])
+    load_hsm_users()
+    quick_start_hsm(policy)
+
+    for count in range(400):
+        psbt = fake_txn(2, 2, dev.master_xpub, change_outputs=[0])
+        auth_user.psbt_hash = sha256(psbt).digest()
+        auth_user("pw")
+        attempt_psbt(psbt)
+
+
 def test_sign_msg_good(quick_start_hsm, change_hsm, attempt_msg_sign, addr_fmt=AF_CLASSIC):
     # message signing, but only at certain derivations
     permit = ['m/73', "m/*'", 'm/1p/3h/4/5/6/7' ]