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Diffstat (limited to 'kpdf/xpdf/xpdf/Decrypt.h')
-rw-r--r-- | kpdf/xpdf/xpdf/Decrypt.h | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/kpdf/xpdf/xpdf/Decrypt.h b/kpdf/xpdf/xpdf/Decrypt.h new file mode 100644 index 00000000..56f34b77 --- /dev/null +++ b/kpdf/xpdf/xpdf/Decrypt.h @@ -0,0 +1,95 @@ +//======================================================================== +// +// Decrypt.h +// +// Copyright 1996-2003 Glyph & Cog, LLC +// +//======================================================================== + +#ifndef DECRYPT_H +#define DECRYPT_H + +#include <aconf.h> + +#ifdef USE_GCC_PRAGMAS +#pragma interface +#endif + +#include "gtypes.h" +#include "GString.h" +#include "Object.h" +#include "Stream.h" + +//------------------------------------------------------------------------ +// Decrypt +//------------------------------------------------------------------------ + +class Decrypt { +public: + + // Generate a file key. The <fileKey> buffer must have space for at + // least 16 bytes. Checks <ownerPassword> and then <userPassword> + // and returns true if either is correct. Sets <ownerPasswordOk> if + // the owner password was correct. Either or both of the passwords + // may be NULL, which is treated as an empty string. + static GBool makeFileKey(int encVersion, int encRevision, int keyLength, + GString *ownerKey, GString *userKey, + int permissions, GString *fileID, + GString *ownerPassword, GString *userPassword, + Guchar *fileKey, GBool encryptMetadata, + GBool *ownerPasswordOk); + +private: + + static GBool makeFileKey2(int encVersion, int encRevision, int keyLength, + GString *ownerKey, GString *userKey, + int permissions, GString *fileID, + GString *userPassword, Guchar *fileKey, + GBool encryptMetadata); +}; + +//------------------------------------------------------------------------ +// DecryptStream +//------------------------------------------------------------------------ + +struct DecryptRC4State { + Guchar state[256]; + Guchar x, y; + int buf; +}; + +struct DecryptAESState { + Guint w[44]; + Guchar state[16]; + Guchar cbc[16]; + Guchar buf[16]; + int bufIdx; +}; + +class DecryptStream: public FilterStream { +public: + + DecryptStream(Stream *strA, Guchar *fileKey, + CryptAlgorithm algoA, int keyLength, + int objNum, int objGen); + virtual ~DecryptStream(); + virtual StreamKind getKind() { return strWeird; } + virtual void reset(); + virtual int getChar(); + virtual int lookChar(); + virtual GBool isBinary(GBool last); + virtual Stream *getUndecodedStream() { return this; } + +private: + + CryptAlgorithm algo; + int objKeyLength; + Guchar objKey[16 + 9]; + + union { + DecryptRC4State rc4; + DecryptAESState aes; + } state; +}; + +#endif |