Initial community commit

Src/external_dependencies/openmpt-trunk/include/unrar/crypt.hpp

@@ -0,0 +1,101 @@
+#ifndef _RAR_CRYPT_
+#define _RAR_CRYPT_
+
+
+enum CRYPT_METHOD {
+  CRYPT_NONE,CRYPT_RAR13,CRYPT_RAR15,CRYPT_RAR20,CRYPT_RAR30,CRYPT_RAR50
+};
+
+#define SIZE_SALT50              16
+#define SIZE_SALT30               8
+#define SIZE_INITV               16
+#define SIZE_PSWCHECK             8
+#define SIZE_PSWCHECK_CSUM        4
+
+#define CRYPT_BLOCK_SIZE         16
+#define CRYPT_BLOCK_MASK         (CRYPT_BLOCK_SIZE-1) // 0xf
+
+#define CRYPT5_KDF_LG2_COUNT     15 // LOG2 of PDKDF2 iteration count.
+#define CRYPT5_KDF_LG2_COUNT_MAX 24 // LOG2 of maximum accepted iteration count.
+#define CRYPT_VERSION             0 // Supported encryption version.
+
+
+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();
+    bool SetCryptKeys(bool Encrypt,CRYPT_METHOD Method,SecPassword *Password,
+         const byte *Salt,const byte *InitV,uint Lg2Cnt,
+         byte *HashKey,byte *PswCheck);
+    void SetAV15Encryption();
+    void SetCmt13Encryption();
+    void EncryptBlock(byte *Buf,size_t Size);
+    void DecryptBlock(byte *Buf,size_t Size);
+    static void SetSalt(byte *Salt,size_t SaltSize);
+};
+
+void GetRnd(byte *RndBuf,size_t BufSize);
+
+void hmac_sha256(const byte *Key,size_t KeyLength,const byte *Data,
+                 size_t DataLength,byte *ResDigest);
+void pbkdf2(const byte *pass, size_t pass_len, const byte *salt,
+            size_t salt_len,byte *key, byte *Value1, byte *Value2,
+            uint rounds);
+
+void ConvertHashToMAC(HashValue *Value,byte *Key);
+
+#endif