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Provide less confusing error on encountering DRM5 LIT books

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This commit is contained in:
Marshall T. Vandegrift 2008-08-16 14:03:19 -04:00
parent 9fa67e9fe3
commit 1ba3b6f671
1 changed files with 8 additions and 7 deletions
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15
src/calibre/ebooks/lit/reader.py
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@ -643,11 +643,14 @@ class LitReader(object):
self.drmlevel = 1
else:
return
msdes.deskey(self._calculate_deskey(), msdes.DE1)
bookkey = msdes.des(self.get_file('/DRMStorage/DRMSealed'))
if bookkey[0] != '\000':
raise LitError('Unable to decrypt title key!')
self.bookkey = bookkey[1:9]
if self.drmlevel < 5:
msdes.deskey(self._calculate_deskey(), msdes.DE1)
bookkey = msdes.des(self.get_file('/DRMStorage/DRMSealed'))
if bookkey[0] != '\000':
raise LitError('Unable to decrypt title key!')
self.bookkey = bookkey[1:9]
else:
raise LitError('Cannot extract content from a DRM protected ebook')
def _calculate_deskey(self):
hashfiles = ['/meta', '/DRMStorage/DRMSource']
@ -710,8 +713,6 @@ class LitReader(object):
return content
def _decrypt(self, content):
if self.drmlevel == 5:
raise LitError('Cannot extract content from a DRM protected ebook')
msdes.deskey(self.bookkey, msdes.DE1)
return msdes.des(content)