Class CryptData

Libraries/unrar/crypt.hpp:23–89

class CryptData
{
  struct KDF5CacheItem
  {
    SecPassword Pwd;
    byte Salt[SIZE_SALT50];
    byte Key[32];
    uint Lg2Count; // Log2 of PBKDF2 repetition count.
    byte PswCheckValue[SHA256_DIGEST_SIZE];
    byte HashKeyValue[SHA256_DIGEST_SIZE];
  };

  struct KDF3CacheItem
  {
    SecPassword Pwd;
    byte Salt[SIZE_SALT30];
    byte Key[16];
    byte Init[16];
    bool SaltPresent;
  };


  private:
    void SetKey13(const char *Password);
    void Decrypt13(byte *Data,size_t Count);

    void SetKey15(const char *Password);
    void Crypt15(byte *Data,size_t Count);

    void SetKey20(const char *Password);
    void Swap20(byte *Ch1,byte *Ch2);
    void UpdKeys20(byte *Buf);
    void EncryptBlock20(byte *Buf);
    void DecryptBlock20(byte *Buf);

    void SetKey30(bool Encrypt,SecPassword *Password,const wchar *PwdW,const byte *Salt);
    void SetKey50(bool Encrypt,SecPassword *Password,const wchar *PwdW,const byte *Salt,const byte *InitV,uint Lg2Cnt,byte *HashKey,byte *PswCheck);

    KDF3CacheItem KDF3Cache[4];
    uint KDF3CachePos;
    
    KDF5CacheItem KDF5Cache[4];
    uint KDF5CachePos;

    CRYPT_METHOD Method;

    Rijndael rin;

    uint CRCTab[256]; // For RAR 1.5 and RAR 2.0 encryption.
    
    byte SubstTable20[256];
    uint Key20[4];

    byte Key13[3];
    ushort Key15[4];
  public:
    CryptData();
    ~CryptData();