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Added method to title module to get if a title is signed legitimately

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This commit is contained in:
Campbell
2024-12-23 23:50:14 -05:00
parent e45c7a3076
commit 046645eb56
14 changed files with 64 additions and 1 deletions
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31
src/libWiiPy/title/title.py
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@@ -4,7 +4,9 @@
# See https://wiibrew.org/wiki/Title for details about how titles are formatted
import math
from .cert import CertificateChain as _CertificateChain
from .cert import (CertificateChain as _CertificateChain,
verify_ca_cert as _verify_ca_cert, verify_cert_sig as _verify_cert_sig,
verify_tmd_sig as _verify_tmd_sig, verify_ticket_sig as _verify_ticket_sig)
from .content import ContentRegion as _ContentRegion
from .ticket import Ticket as _Ticket
from .tmd import TMD as _TMD
@@ -418,3 +420,30 @@ class Title:
return True
else:
return False
def get_is_signed(self) -> bool:
"""
Uses the certificate chain to verify whether the Title object contains a properly signed title or not. This
verifies both the TMD and Ticket, and if either one fails verification then the title is not considered valid.
This will validate the entire certificate chain. If any part of the chain doesn't match the other pieces, then
this method will raise an exception.
Returns
-------
bool
Whether the title is properly signed or not.
"""
# The entire chain needs to be verified, so start with the CA cert and work our way down. If anything fails
# along the way, future steps don't matter so exit the descending if's and return False.
try:
if _verify_ca_cert(self.cert_chain.ca_cert) is True:
if _verify_cert_sig(self.cert_chain.ca_cert, self.cert_chain.tmd_cert) is True:
if _verify_tmd_sig(self.cert_chain.tmd_cert, self.tmd) is True:
if _verify_cert_sig(self.cert_chain.ca_cert, self.cert_chain.ticket_cert) is True:
if _verify_ticket_sig(self.cert_chain.ticket_cert, self.ticket) is True:
return True
except ValueError:
raise ValueError("This title's certificate chain is not valid, or does not match the signature type of "
"the TMD/Ticket.")
return False