/* ---- 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.
 */
 
 /* 2006-10-18 Added Serpent methods for OTFExplorer by JHH */
 
#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 SERPENT
struct serpent_key {
   unsigned long K[132];
};
#endif

#ifdef RIJNDAEL
struct rijndael_key {
   ulong32 eK[60], dK[60];
   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 SERPENT
   struct serpent_key  serpent;
#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
   void   *data;
} symmetric_key;

#ifdef LTC_ECB_MODE
/** 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;
#endif

#ifdef LTC_CFB_MODE
/** 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;
#endif

#ifdef LTC_OFB_MODE
/** 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;
#endif

#ifdef LTC_CBC_MODE
/** 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;
#endif


#ifdef LTC_CTR_MODE
/** 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;
#endif


#ifdef LTC_LRW_MODE
/** A LRW structure */
typedef struct {
    /** The index of the cipher chosen (must be a 128-bit block cipher) */
    int               cipher;

    /** The current IV */
    unsigned char     IV[16],
 
    /** the tweak key */
                      tweak[16],

    /** The current pad, it's the product of the first 15 bytes against the tweak key */
                      pad[16];

    /** The scheduled symmetric key */
    symmetric_key     key;

#ifdef LRW_TABLES
    /** The pre-computed multiplication table */
    unsigned char     PC[16][256][16];
#endif
} symmetric_LRW;
#endif

#ifdef LTC_F8_MODE
/** A block cipher F8 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],
                       MIV[MAXBLOCKSIZE];
   /** Current block count */
   ulong32             blockcnt;
   /** The scheduled key */
   symmetric_key       key;
} symmetric_F8;
#endif


/** 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) */
        block_length, 
   /** default number of rounds */
        default_rounds;
   /** Setup the cipher 
      @param key         The input symmetric key
      @param keylen      The length of the input key (octets)
      @param num_rounds  The requested number of rounds (0==default)
      @param skey        [out] The destination of the scheduled key
      @return CRYPT_OK if successful
   */
   int  (*setup)(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
   /** Encrypt a block
      @param pt      The plaintext
      @param ct      [out] The ciphertext
      @param skey    The scheduled key
      @return CRYPT_OK if successful
   */
   int (*ecb_encrypt)(const unsigned char *pt, unsigned char *ct, symmetric_key *skey);
   /** Decrypt a block
      @param ct      The ciphertext
      @param pt      [out] The plaintext
      @param skey    The scheduled key
      @return CRYPT_OK if successful
   */
   int (*ecb_decrypt)(const unsigned char *ct, unsigned char *pt, symmetric_key *skey);
   /** Test the block cipher
       @return CRYPT_OK if successful, CRYPT_NOP if self-testing has been disabled
   */
   int (*test)(void);

   /** Terminate the context 
      @param skey    The scheduled key
   */
   void (*done)(symmetric_key *skey);      

   /** Determine a key size
       @param keysize    [in/out] The size of the key desired and the suggested size
       @return CRYPT_OK if successful
   */
   int  (*keysize)(int *keysize);

/** Accelerators **/
   /** Accelerated ECB encryption 
       @param pt      Plaintext
       @param ct      Ciphertext
       @param blocks  The number of complete blocks to process
       @param skey    The scheduled key context
       @return CRYPT_OK if successful
   */
   int (*accel_ecb_encrypt)(const unsigned char *pt, unsigned char *ct, unsigned long blocks, symmetric_key *skey);

   /** Accelerated ECB decryption 
       @param pt      Plaintext
       @param ct      Ciphertext
       @param blocks  The number of complete blocks to process
       @param skey    The scheduled key context
       @return CRYPT_OK if successful
   */
   int (*accel_ecb_decrypt)(const unsigned char *ct, unsigned char *pt, unsigned long blocks, symmetric_key *skey);

   /** Accelerated CBC encryption 
       @param pt      Plaintext
       @param ct      Ciphertext
       @param blocks  The number of complete blocks to process
       @param IV      The initial value (input/output)
       @param skey    The scheduled key context
       @return CRYPT_OK if successful
   */
   int (*accel_cbc_encrypt)(const unsigned char *pt, unsigned char *ct, unsigned long blocks, unsigned char *IV, symmetric_key *skey);

   /** Accelerated CBC decryption 
       @param pt      Plaintext
       @param ct      Ciphertext
       @param blocks  The number of complete blocks to process
       @param IV      The initial value (input/output)
       @param skey    The scheduled key context
       @return CRYPT_OK if successful
   */
   int (*accel_cbc_decrypt)(const unsigned char *ct, unsigned char *pt, unsigned long blocks, unsigned char *IV, symmetric_key *skey);

   /** Accelerated CTR encryption 
       @param pt      Plaintext
       @param ct      Ciphertext
       @param blocks  The number of complete blocks to process
       @param IV      The initial value (input/output)
       @param mode    little or big endian counter (mode=0 or mode=1)
       @param skey    The scheduled key context
       @return CRYPT_OK if successful
   */
   int (*accel_ctr_encrypt)(const unsigned char *pt, unsigned char *ct, unsigned long blocks, unsigned char *IV, int mode, symmetric_key *skey);

   /** Accelerated LRW 
       @param pt      Plaintext
       @param ct      Ciphertext
       @param blocks  The number of complete blocks to process
       @param IV      The initial value (input/output)
       @param tweak   The LRW tweak
       @param skey    The scheduled key context
       @return CRYPT_OK if successful
   */
   int (*accel_lrw_encrypt)(const unsigned char *pt, unsigned char *ct, unsigned long blocks, unsigned char *IV, const unsigned char *tweak, symmetric_key *skey);

   /** Accelerated LRW 
       @param ct      Ciphertext
       @param pt      Plaintext
       @param blocks  The number of complete blocks to process
       @param IV      The initial value (input/output)
       @param tweak   The LRW tweak
       @param skey    The scheduled key context
       @return CRYPT_OK if successful
   */
   int (*accel_lrw_decrypt)(const unsigned char *ct, unsigned char *pt, unsigned long blocks, unsigned char *IV, const unsigned char *tweak, symmetric_key *skey);

   /** Accelerated CCM packet (one-shot)
       @param key        The secret key to use
       @param keylen     The length of the secret key (octets)
       @param uskey      A previously scheduled key [optional can be NULL]
       @param nonce      The session nonce [use once]
       @param noncelen   The length of the nonce
       @param header     The header for the session
       @param headerlen  The length of the header (octets)
       @param pt         [out] The plaintext
       @param ptlen      The length of the plaintext (octets)
       @param ct         [out] The ciphertext
       @param tag        [out] The destination tag
       @param taglen     [in/out] The max size and resulting size of the authentication tag
       @param direction  Encrypt or Decrypt direction (0 or 1)
       @return CRYPT_OK if successful
   */
   int (*accel_ccm_memory)(
       const unsigned char *key,    unsigned long keylen,
       symmetric_key       *uskey,
       const unsigned char *nonce,  unsigned long noncelen,
       const unsigned char *header, unsigned long headerlen,
             unsigned char *pt,     unsigned long ptlen,
             unsigned char *ct,
             unsigned char *tag,    unsigned long *taglen,
                       int  direction);

   /** Accelerated GCM packet (one shot)
       @param key               The secret key
       @param keylen            The length of the secret key
       @param IV                The initial vector 
       @param IVlen             The length of the initial vector
       @param adata             The additional authentication data (header)
       @param adatalen          The length of the adata
       @param pt                The plaintext
       @param ptlen             The length of the plaintext (ciphertext length is the same)
       @param ct                The ciphertext
       @param tag               [out] The MAC tag
       @param taglen            [in/out] The MAC tag length
       @param direction         Encrypt or Decrypt mode (GCM_ENCRYPT or GCM_DECRYPT)
       @return CRYPT_OK on success
   */
   int (*accel_gcm_memory)(
       const unsigned char *key,    unsigned long keylen,
       const unsigned char *IV,     unsigned long IVlen,
       const unsigned char *adata,  unsigned long adatalen,
             unsigned char *pt,     unsigned long ptlen,
             unsigned char *ct, 
             unsigned char *tag,    unsigned long *taglen,
                       int direction);
} cipher_descriptor[];

#ifdef BLOWFISH
int blowfish_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
int blowfish_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey);
int blowfish_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey);
int blowfish_test(void);
void blowfish_done(symmetric_key *skey);
int blowfish_keysize(int *keysize);
extern const struct ltc_cipher_descriptor blowfish_desc;
#endif

#ifdef RC5
int rc5_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
int rc5_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey);
int rc5_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey);
int rc5_test(void);
void rc5_done(symmetric_key *skey);
int rc5_keysize(int *keysize);
extern const struct ltc_cipher_descriptor rc5_desc;
#endif

#ifdef RC6
int rc6_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
int rc6_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey);
int rc6_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey);
int rc6_test(void);
void rc6_done(symmetric_key *skey);
int rc6_keysize(int *keysize);
extern const struct ltc_cipher_descriptor rc6_desc;
#endif

#ifdef RC2
int rc2_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
int rc2_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey);
int rc2_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey);
int rc2_test(void);
void rc2_done(symmetric_key *skey);
int rc2_keysize(int *keysize);
extern const struct ltc_cipher_descriptor rc2_desc;
#endif

#ifdef SAFERP
int saferp_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
int saferp_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey);
int saferp_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey);
int saferp_test(void);
void saferp_done(symmetric_key *skey);
int saferp_keysize(int *keysize);
extern const struct ltc_cipher_descriptor saferp_desc;
#endif

#ifdef SAFER
int safer_k64_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
int safer_sk64_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
int safer_k128_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
int safer_sk128_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
int safer_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *key);
int safer_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *key);
int safer_k64_test(void);
int safer_sk64_test(void);
int safer_sk128_test(void);
void safer_done(symmetric_key *skey);
int safer_64_keysize(int *keysize);
int safer_128_keysize(int *keysize);
extern const struct ltc_cipher_descriptor safer_k64_desc, safer_k128_desc, safer_sk64_desc, safer_sk128_desc;
#endif

#ifdef RIJNDAEL

/* make aes an alias */
#define aes_setup           rijndael_setup
#define aes_ecb_encrypt     rijndael_ecb_encrypt
#define aes_ecb_decrypt     rijndael_ecb_decrypt
#define aes_test            rijndael_test
#define aes_done            rijndael_done
#define aes_keysize         rijndael_keysize

#define aes_enc_setup           rijndael_enc_setup
#define aes_enc_ecb_encrypt     rijndael_enc_ecb_encrypt
#define aes_enc_keysize         rijndael_enc_keysize

int rijndael_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
int rijndael_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey);
int rijndael_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey);
int rijndael_test(void);
void rijndael_done(symmetric_key *skey);
int rijndael_keysize(int *keysize);
int rijndael_enc_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
int rijndael_enc_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey);
void rijndael_enc_done(symmetric_key *skey);
int rijndael_enc_keysize(int *keysize);
extern const struct ltc_cipher_descriptor rijndael_desc, aes_desc;
extern const struct ltc_cipher_descriptor rijndael_enc_desc, aes_enc_desc;
#endif

#ifdef XTEA
int xtea_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
int xtea_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey);
int xtea_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey);
int xtea_test(void);
void xtea_done(symmetric_key *skey);
int xtea_keysize(int *keysize);
extern const struct ltc_cipher_descriptor xtea_desc;
#endif

#ifdef SERPENT
int serpent_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
int serpent_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *key);
int serpent_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *key);
int serpent_test(void);
void serpent_done(symmetric_key *skey);
int serpent_keysize(int *keysize);
extern const struct ltc_cipher_descriptor serpent_desc;
#endif

#ifdef TWOFISH
int twofish_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
int twofish_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey);
int twofish_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey);
int twofish_test(void);
void twofish_done(symmetric_key *skey);
int twofish_keysize(int *keysize);
extern const struct ltc_cipher_descriptor twofish_desc;
#endif

#ifdef DES
int des_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
int des_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey);
int des_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey);
int des_test(void);
void des_done(symmetric_key *skey);
int des_keysize(int *keysize);
int des3_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
int des3_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey);
int des3_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey);
int des3_test(void);
void des3_done(symmetric_key *skey);
int des3_keysize(int *keysize);
extern const struct ltc_cipher_descriptor des_desc, des3_desc;
#endif

#ifdef CAST5
int cast5_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
int cast5_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey);
int cast5_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey);
int cast5_test(void);
void cast5_done(symmetric_key *skey);
int cast5_keysize(int *keysize);
extern const struct ltc_cipher_descriptor cast5_desc;
#endif

#ifdef NOEKEON
int noekeon_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
int noekeon_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey);
int noekeon_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey);
int noekeon_test(void);
void noekeon_done(symmetric_key *skey);
int noekeon_keysize(int *keysize);
extern const struct ltc_cipher_descriptor noekeon_desc;
#endif

#ifdef SKIPJACK
int skipjack_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
int skipjack_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey);
int skipjack_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey);
int skipjack_test(void);
void skipjack_done(symmetric_key *skey);
int skipjack_keysize(int *keysize);
extern const struct ltc_cipher_descriptor skipjack_desc;
#endif

#ifdef KHAZAD
int khazad_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
int khazad_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey);
int khazad_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey);
int khazad_test(void);
void khazad_done(symmetric_key *skey);
int khazad_keysize(int *keysize);
extern const struct ltc_cipher_descriptor khazad_desc;
#endif

#ifdef ANUBIS
int anubis_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
int anubis_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey);
int anubis_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey);
int anubis_test(void);
void anubis_done(symmetric_key *skey);
int anubis_keysize(int *keysize);
extern const struct ltc_cipher_descriptor anubis_desc;
#endif

#ifdef LTC_ECB_MODE
int ecb_start(int cipher, const unsigned char *key, 
              int keylen, int num_rounds, symmetric_ECB *ecb);
int ecb_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_ECB *ecb);
int ecb_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_ECB *ecb);
int ecb_done(symmetric_ECB *ecb);
#endif

#ifdef LTC_CFB_MODE
int cfb_start(int cipher, const unsigned char *IV, const unsigned char *key, 
              int keylen, int num_rounds, symmetric_CFB *cfb);
int cfb_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_CFB *cfb);
int cfb_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_CFB *cfb);
int cfb_getiv(unsigned char *IV, unsigned long *len, symmetric_CFB *cfb);
int cfb_setiv(const unsigned char *IV, unsigned long len, symmetric_CFB *cfb);
int cfb_done(symmetric_CFB *cfb);
#endif

#ifdef LTC_OFB_MODE
int ofb_start(int cipher, const unsigned char *IV, const unsigned char *key, 
              int keylen, int num_rounds, symmetric_OFB *ofb);
int ofb_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_OFB *ofb);
int ofb_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_OFB *ofb);
int ofb_getiv(unsigned char *IV, unsigned long *len, symmetric_OFB *ofb);
int ofb_setiv(const unsigned char *IV, unsigned long len, symmetric_OFB *ofb);
int ofb_done(symmetric_OFB *ofb);
#endif

#ifdef LTC_CBC_MODE
int cbc_start(int cipher, const unsigned char *IV, const unsigned char *key,
               int keylen, int num_rounds, symmetric_CBC *cbc);
int cbc_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_CBC *cbc);
int cbc_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_CBC *cbc);
int cbc_getiv(unsigned char *IV, unsigned long *len, symmetric_CBC *cbc);
int cbc_setiv(const unsigned char *IV, unsigned long len, symmetric_CBC *cbc);
int cbc_done(symmetric_CBC *cbc);
#endif

#ifdef LTC_CTR_MODE

#define CTR_COUNTER_LITTLE_ENDIAN    0
#define CTR_COUNTER_BIG_ENDIAN       1

int ctr_start(               int   cipher,
              const unsigned char *IV,
              const unsigned char *key,       int keylen,
                             int  num_rounds, int ctr_mode,
                   symmetric_CTR *ctr);
int ctr_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_CTR *ctr);
int ctr_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_CTR *ctr);
int ctr_getiv(unsigned char *IV, unsigned long *len, symmetric_CTR *ctr);
int ctr_setiv(const unsigned char *IV, unsigned long len, symmetric_CTR *ctr);
int ctr_done(symmetric_CTR *ctr);
#endif

#ifdef LTC_LRW_MODE

#define LRW_ENCRYPT 0
#define LRW_DECRYPT 1

int lrw_start(               int   cipher,
              const unsigned char *IV,
              const unsigned char *key,       int keylen,
              const unsigned char *tweak,
                             int  num_rounds, 
                   symmetric_LRW *lrw);
int lrw_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_LRW *lrw);
int lrw_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_LRW *lrw);
int lrw_getiv(unsigned char *IV, unsigned long *len, symmetric_LRW *lrw);
int lrw_setiv(const unsigned char *IV, unsigned long len, symmetric_LRW *lrw);
int lrw_done(symmetric_LRW *lrw);
int lrw_test(void);

/* don't call */
int lrw_process(const unsigned char *pt, unsigned char *ct, unsigned long len, int mode, symmetric_LRW *lrw);
#endif    

#ifdef LTC_F8_MODE
int f8_start(                int  cipher, const unsigned char *IV, 
             const unsigned char *key,                    int  keylen, 
             const unsigned char *salt_key,               int  skeylen,
                             int  num_rounds,   symmetric_F8  *f8);
int f8_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_F8 *f8);
int f8_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_F8 *f8);
int f8_getiv(unsigned char *IV, unsigned long *len, symmetric_F8 *f8);
int f8_setiv(const unsigned char *IV, unsigned long len, symmetric_F8 *f8);
int f8_done(symmetric_F8 *f8);
int f8_test_mode(void);
#endif


int find_cipher(const char *name);
int find_cipher_any(const char *name, int blocklen, int keylen);
int find_cipher_id(unsigned char ID);
int register_cipher(const struct ltc_cipher_descriptor *cipher);
int unregister_cipher(const struct ltc_cipher_descriptor *cipher);
int cipher_is_valid(int idx);

LTC_MUTEX_PROTO(ltc_cipher_mutex)

/* $Source: /cvs/libtom/libtomcrypt/src/headers/tomcrypt_cipher.h,v $ */
/* $Revision: 1.38 $ */
/* $Date: 2006/08/24 14:35:45 $ */
