tomcrypt_cipher.h

这是一个用来加解密的算法库

/* ---- SYMMETRIC KEY STUFF -----
 *
 * We put each of the ciphers scheduled keys in their own structs then we put all of 
 * the key formats in one union.  This makes the function prototypes easier to use.
 */
#ifdef BLOWFISH
struct blowfish_key {
   ulong32 S[4][256];
   ulong32 K[18];
};
#endif

#ifdef RC5
struct rc5_key {
   int rounds;
   ulong32 K[50];
};
#endif

#ifdef RC6
struct rc6_key {
   ulong32 K[44];
};
#endif

#ifdef SAFERP
struct saferp_key {
   unsigned char K[33][16];
   long rounds;
};
#endif

#ifdef RIJNDAEL
struct rijndael_key {
   ulong32 eK[64], dK[64];
   int Nr;
};
#endif

#ifdef XTEA
struct xtea_key {
   unsigned long A[32], B[32];
};
#endif

#ifdef TWOFISH
#ifndef TWOFISH_SMALL
   struct twofish_key {
      ulong32 S[4][256], K[40];
   };
#else
   struct twofish_key {
      ulong32 K[40];
      unsigned char S[32], start;
   };
#endif
#endif

#ifdef SAFER
#define SAFER_K64_DEFAULT_NOF_ROUNDS     6
#define SAFER_K128_DEFAULT_NOF_ROUNDS   10
#define SAFER_SK64_DEFAULT_NOF_ROUNDS    8
#define SAFER_SK128_DEFAULT_NOF_ROUNDS  10
#define SAFER_MAX_NOF_ROUNDS            13
#define SAFER_BLOCK_LEN                  8
#define SAFER_KEY_LEN     (1 + SAFER_BLOCK_LEN * (1 + 2 * SAFER_MAX_NOF_ROUNDS))
typedef unsigned char safer_block_t[SAFER_BLOCK_LEN];
typedef unsigned char safer_key_t[SAFER_KEY_LEN];
struct safer_key { safer_key_t key; };
#endif

#ifdef RC2
struct rc2_key { unsigned xkey[64]; };
#endif

#ifdef DES
struct des_key {
    ulong32 ek[32], dk[32];
};

struct des3_key {
    ulong32 ek[3][32], dk[3][32];
};
#endif

#ifdef CAST5
struct cast5_key {
    ulong32 K[32], keylen;
};
#endif

#ifdef NOEKEON
struct noekeon_key {
    ulong32 K[4], dK[4];
};
#endif

#ifdef SKIPJACK 
struct skipjack_key {
    unsigned char key[10];
};
#endif

#ifdef KHAZAD
struct khazad_key {
   ulong64 roundKeyEnc[8 + 1]; 
   ulong64 roundKeyDec[8 + 1]; 
};
#endif

#ifdef ANUBIS
struct anubis_key { 
   int keyBits; 
   int R; 
   ulong32 roundKeyEnc[18 + 1][4]; 
   ulong32 roundKeyDec[18 + 1][4]; 
}; 
#endif

typedef union Symmetric_key {
#ifdef DES
   struct des_key des;
   struct des3_key des3;
#endif
#ifdef RC2
   struct rc2_key rc2;
#endif
#ifdef SAFER
   struct safer_key safer;
#endif
#ifdef TWOFISH
   struct twofish_key  twofish;
#endif
#ifdef BLOWFISH
   struct blowfish_key blowfish;
#endif
#ifdef RC5
   struct rc5_key      rc5;
#endif
#ifdef RC6
   struct rc6_key      rc6;
#endif
#ifdef SAFERP
   struct saferp_key   saferp;
#endif
#ifdef RIJNDAEL
   struct rijndael_key rijndael;
#endif
#ifdef XTEA
   struct xtea_key     xtea;
#endif
#ifdef CAST5
   struct cast5_key    cast5;
#endif
#ifdef NOEKEON
   struct noekeon_key  noekeon;
#endif   
#ifdef SKIPJACK
   struct skipjack_key skipjack;
#endif
#ifdef KHAZAD
   struct khazad_key   khazad;
#endif
#ifdef ANUBIS
   struct anubis_key   anubis;
#endif
} symmetric_key;

/* A block cipher ECB structure */
typedef struct {
   /** The index of the cipher chosen */
   int                 cipher, 
   /** The block size of the given cipher */
                       blocklen;
   /** The scheduled key */                       
   symmetric_key       key;
} symmetric_ECB;

/* A block cipher CFB structure */
typedef struct {
   /** The index of the cipher chosen */
   int                 cipher, 
   /** The block size of the given cipher */                        
                       blocklen, 
   /** The padding offset */
                       padlen;
   /** The current IV */
   unsigned char       IV[MAXBLOCKSIZE], 
   /** The pad used to encrypt/decrypt */ 
                       pad[MAXBLOCKSIZE];
   /** The scheduled key */
   symmetric_key       key;
} symmetric_CFB;

/* A block cipher OFB structure */
typedef struct {
   /** The index of the cipher chosen */
   int                 cipher, 
   /** The block size of the given cipher */                        
                       blocklen, 
   /** The padding offset */
                       padlen;
   /** The current IV */
   unsigned char       IV[MAXBLOCKSIZE];
   /** The scheduled key */
   symmetric_key       key;
} symmetric_OFB;

/* A block cipher CBC structure */
typedef struct {
   /** The index of the cipher chosen */
   int                 cipher, 
   /** The block size of the given cipher */                        
                       blocklen;
   /** The current IV */
   unsigned char       IV[MAXBLOCKSIZE];
   /** The scheduled key */
   symmetric_key       key;
} symmetric_CBC;

/* A block cipher CTR structure */
typedef struct {
   /** The index of the cipher chosen */
   int                 cipher,
   /** The block size of the given cipher */                        
                       blocklen, 
   /** The padding offset */
                       padlen, 
   /** The mode (endianess) of the CTR, 0==little, 1==big */                       
                       mode;
   /** The counter */                       
   unsigned char       ctr[MAXBLOCKSIZE], 
   /** The pad used to encrypt/decrypt */                       
                       pad[MAXBLOCKSIZE];
   /** The scheduled key */
   symmetric_key       key;
} symmetric_CTR;

/* cipher descriptor table, last entry has "name == NULL" to mark the end of table */
extern struct ltc_cipher_descriptor {
   /** name of cipher */
   char *name;
   /** internal ID */
   unsigned char ID;
   /** min keysize (octets) */
   int  min_key_length, 
   /** max keysize (octets) */
        max_key_length, 
   /** block size (octets) */