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Fix plugin crash with invalid ADE key

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NoDRM 2022-08-03 19:49:20 +02:00
parent 59839ae5c7
commit 9a11f480b5
2 changed files with 5 additions and 3 deletions
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1
CHANGELOG.md
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@ -71,3 +71,4 @@ List of changes since the fork of Apprentice Harper's repository:
- Fix a bug introduced with #48 that breaks DeDRM'ing on Calibre 4 (fixes #101). - Fix a bug introduced with #48 that breaks DeDRM'ing on Calibre 4 (fixes #101).
- Fix some more Calibre-6 bugs in the Obok plugin (should fix #114). - Fix some more Calibre-6 bugs in the Obok plugin (should fix #114).
- Fix a bug where invalid Adobe keys could cause the plugin to stop trying subsequent keys (partially fixes #109).

7
DeDRM_plugin/__init__.py
View file

@ -511,10 +511,10 @@ class DeDRM(FileTypePlugin):
continue continue
# Found matching key # Found matching key
userkey = codecs.decode(userkeyhex, 'hex')
print("{0} v{1}: Trying UUID-matched encryption key {2:s}".format(PLUGIN_NAME, PLUGIN_VERSION, keyname)) print("{0} v{1}: Trying UUID-matched encryption key {2:s}".format(PLUGIN_NAME, PLUGIN_VERSION, keyname))
of = self.temporary_file(".epub") of = self.temporary_file(".epub")
try: try:
userkey = codecs.decode(userkeyhex, 'hex')
result = ineptepub.decryptBook(userkey, inf.name, of.name) result = ineptepub.decryptBook(userkey, inf.name, of.name)
of.close() of.close()
if result == 0: if result == 0:
@ -531,12 +531,13 @@ class DeDRM(FileTypePlugin):
# Attempt to decrypt epub with each encryption key (generated or provided). # Attempt to decrypt epub with each encryption key (generated or provided).
for keyname, userkeyhex in dedrmprefs['adeptkeys'].items(): for keyname, userkeyhex in dedrmprefs['adeptkeys'].items():
userkey = codecs.decode(userkeyhex, 'hex')
print("{0} v{1}: Trying Encryption key {2:s}".format(PLUGIN_NAME, PLUGIN_VERSION, keyname)) print("{0} v{1}: Trying Encryption key {2:s}".format(PLUGIN_NAME, PLUGIN_VERSION, keyname))
of = self.temporary_file(".epub") of = self.temporary_file(".epub")
# Give the user key, ebook and TemporaryPersistent file to the decryption function. # Give the user key, ebook and TemporaryPersistent file to the decryption function.
try: try:
userkey = codecs.decode(userkeyhex, 'hex')
result = ineptepub.decryptBook(userkey, inf.name, of.name) result = ineptepub.decryptBook(userkey, inf.name, of.name)
except ineptepub.ADEPTNewVersionError: except ineptepub.ADEPTNewVersionError:
print("{0} v{1}: Book uses unsupported (too new) Adobe DRM.".format(PLUGIN_NAME, PLUGIN_VERSION, time.time()-self.starttime)) print("{0} v{1}: Book uses unsupported (too new) Adobe DRM.".format(PLUGIN_NAME, PLUGIN_VERSION, time.time()-self.starttime))
@ -673,11 +674,11 @@ class DeDRM(FileTypePlugin):
continue continue
# Found matching key # Found matching key
userkey = codecs.decode(userkeyhex, 'hex')
print("{0} v{1}: Trying UUID-matched encryption key {2:s}".format(PLUGIN_NAME, PLUGIN_VERSION, keyname)) print("{0} v{1}: Trying UUID-matched encryption key {2:s}".format(PLUGIN_NAME, PLUGIN_VERSION, keyname))
of = self.temporary_file(".pdf") of = self.temporary_file(".pdf")
try: try:
userkey = codecs.decode(userkeyhex, 'hex')
result = ineptpdf.decryptBook(userkey, path_to_ebook, of.name) result = ineptpdf.decryptBook(userkey, path_to_ebook, of.name)
of.close() of.close()
if result == 0: if result == 0: