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Crypo 13 and 14 checks ordering #9

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Crypo 13 and 14 checks ordering #9

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56019cc
change crypto lv13 checks order
f4-u57 Nov 10, 2023
fc9bba3
change crypto lv14 checks order
f4-u57 Nov 10, 2023
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9 changes: 6 additions & 3 deletions cryptography/run
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Original file line number Diff line number Diff line change
Expand Up @@ -308,7 +308,6 @@ def level13():
show_b64("root certificate signature", root_certificate_signature)

user_certificate_data = input_b64("user certificate")
user_certificate_signature = input_b64("user certificate signature")

try:
user_certificate = json.loads(user_certificate_data)
Expand Down Expand Up @@ -339,6 +338,8 @@ def level13():
print(f"Untrusted user certificate signer: `{user_signer}`", file=sys.stderr)
exit(1)

user_certificate_signature = input_b64("user certificate signature")

user_signer_key = root_trusted_certificates[user_signer]["key"]
user_certificate_hash = SHA256Hash(user_certificate_data).digest()
user_certificate_check = pow(
Expand Down Expand Up @@ -437,8 +438,6 @@ def level14():
exit(1)

user_certificate_data = decrypt_input_b64("user certificate")
user_certificate_signature = decrypt_input_b64("user certificate signature")
user_signature = decrypt_input_b64("user signature")

try:
user_certificate = json.loads(user_certificate_data)
Expand Down Expand Up @@ -469,6 +468,8 @@ def level14():
print(f"Untrusted user certificate signer: `{user_signer}`", file=sys.stderr)
exit(1)

user_certificate_signature = decrypt_input_b64("user certificate signature")

user_signer_key = root_trusted_certificates[user_signer]["key"]
user_certificate_hash = SHA256Hash(user_certificate_data).digest()
user_certificate_check = pow(
Expand All @@ -481,6 +482,8 @@ def level14():
print("Untrusted user certificate: invalid signature", file=sys.stderr)
exit(1)

user_signature = decrypt_input_b64("user signature")

user_signature_data = (
name.encode().ljust(256, b"\0") +
A.to_bytes(256, "little") +
Expand Down