#ifdef HMAC
typedef struct Hmac_state {
     hash_state     md;
     int            hash;
     hash_state     hashstate;
     unsigned char  *key;
} hmac_state;

int hmac_init(hmac_state *hmac, int hash, const unsigned char *key, unsigned long keylen);
int hmac_process(hmac_state *hmac, const unsigned char *in, unsigned long inlen);
int hmac_done(hmac_state *hmac, unsigned char *out, unsigned long *outlen);
int hmac_test(void);
int hmac_memory(int hash, 
                const unsigned char *key, unsigned long keylen,
                const unsigned char *in,  unsigned long inlen, 
                      unsigned char *out, unsigned long *outlen);
int hmac_memory_multi(int hash, 
                const unsigned char *key,  unsigned long keylen,
                      unsigned char *out,  unsigned long *outlen,
                const unsigned char *in,   unsigned long inlen, ...);
int hmac_file(int hash, const char *fname, const unsigned char *key,
              unsigned long keylen, 
              unsigned char *dst, unsigned long *dstlen);
#endif

#ifdef OMAC

typedef struct {
   int             cipher_idx, 
                   buflen,
                   blklen;
   unsigned char   block[MAXBLOCKSIZE],
                   prev[MAXBLOCKSIZE],
                   Lu[2][MAXBLOCKSIZE];
   symmetric_key   key;
} omac_state;

int omac_init(omac_state *omac, int cipher, const unsigned char *key, unsigned long keylen);
int omac_process(omac_state *omac, const unsigned char *in, unsigned long inlen);
int omac_done(omac_state *omac, unsigned char *out, unsigned long *outlen);
int omac_memory(int cipher, 
               const unsigned char *key, unsigned long keylen,
               const unsigned char *in,  unsigned long inlen,
                     unsigned char *out, unsigned long *outlen);
int omac_memory_multi(int cipher, 
                const unsigned char *key, unsigned long keylen,
                      unsigned char *out, unsigned long *outlen,
                const unsigned char *in,  unsigned long inlen, ...);
int omac_file(int cipher, 
              const unsigned char *key, unsigned long keylen,
              const          char *filename, 
                    unsigned char *out, unsigned long *outlen);
int omac_test(void);
#endif /* OMAC */

#ifdef PMAC

typedef struct {
   unsigned char     Ls[32][MAXBLOCKSIZE],    /* L shifted by i bits to the left */
                     Li[MAXBLOCKSIZE],        /* value of Li [current value, we calc from previous recall] */
                     Lr[MAXBLOCKSIZE],        /* L * x^-1 */
                     block[MAXBLOCKSIZE],     /* currently accumulated block */
                     checksum[MAXBLOCKSIZE];  /* current checksum */

   symmetric_key     key;                     /* scheduled key for cipher */
   unsigned long     block_index;             /* index # for current block */
   int               cipher_idx,              /* cipher idx */
                     block_len,               /* length of block */
                     buflen;                  /* number of bytes in the buffer */
} pmac_state;

int pmac_init(pmac_state *pmac, int cipher, const unsigned char *key, unsigned long keylen);
int pmac_process(pmac_state *pmac, const unsigned char *in, unsigned long inlen);
int pmac_done(pmac_state *pmac, unsigned char *out, unsigned long *outlen);

int pmac_memory(int cipher, 
               const unsigned char *key, unsigned long keylen,
               const unsigned char *msg, unsigned long msglen,
                     unsigned char *out, unsigned long *outlen);

int pmac_memory_multi(int cipher, 
                const unsigned char *key, unsigned long keylen,
                      unsigned char *out, unsigned long *outlen,
                const unsigned char *in, unsigned long inlen, ...);

int pmac_file(int cipher, 
             const unsigned char *key, unsigned long keylen,
             const          char *filename, 
                   unsigned char *out, unsigned long *outlen);

int pmac_test(void);

/* internal functions */
int pmac_ntz(unsigned long x);
void pmac_shift_xor(pmac_state *pmac);

#endif /* PMAC */

#ifdef EAX_MODE

#if !(defined(OMAC) && defined(CTR))
   #error EAX_MODE requires OMAC and CTR
#endif

typedef struct {
   unsigned char N[MAXBLOCKSIZE];
   symmetric_CTR ctr;
   omac_state    headeromac, ctomac;
} eax_state;

int eax_init(eax_state *eax, int cipher, const unsigned char *key, unsigned long keylen,
             const unsigned char *nonce, unsigned long noncelen,
             const unsigned char *header, unsigned long headerlen);

int eax_encrypt(eax_state *eax, const unsigned char *pt, unsigned char *ct, unsigned long length);
int eax_decrypt(eax_state *eax, const unsigned char *ct, unsigned char *pt, unsigned long length);
int eax_addheader(eax_state *eax, const unsigned char *header, unsigned long length);
int eax_done(eax_state *eax, unsigned char *tag, unsigned long *taglen);

int eax_encrypt_authenticate_memory(int cipher,
    const unsigned char *key,    unsigned long keylen,
    const unsigned char *nonce,  unsigned long noncelen,
    const unsigned char *header, unsigned long headerlen,
    const unsigned char *pt,     unsigned long ptlen,
          unsigned char *ct,
          unsigned char *tag,    unsigned long *taglen);

int eax_decrypt_verify_memory(int cipher,
    const unsigned char *key,    unsigned long keylen,
    const unsigned char *nonce,  unsigned long noncelen,
    const unsigned char *header, unsigned long headerlen,
    const unsigned char *ct,     unsigned long ctlen,
          unsigned char *pt,
          unsigned char *tag,    unsigned long taglen,
          int           *stat);

 int eax_test(void);
#endif /* EAX MODE */

#ifdef OCB_MODE
typedef struct {
   unsigned char     L[MAXBLOCKSIZE],         /* L value */
                     Ls[32][MAXBLOCKSIZE],    /* L shifted by i bits to the left */
                     Li[MAXBLOCKSIZE],        /* value of Li [current value, we calc from previous recall] */
                     Lr[MAXBLOCKSIZE],        /* L * x^-1 */
                     R[MAXBLOCKSIZE],         /* R value */
                     checksum[MAXBLOCKSIZE];  /* current checksum */

   symmetric_key     key;                     /* scheduled key for cipher */
   unsigned long     block_index;             /* index # for current block */
   int               cipher,                  /* cipher idx */
                     block_len;               /* length of block */
} ocb_state;

int ocb_init(ocb_state *ocb, int cipher, 
             const unsigned char *key, unsigned long keylen, const unsigned char *nonce);

int ocb_encrypt(ocb_state *ocb, const unsigned char *pt, unsigned char *ct);
int ocb_decrypt(ocb_state *ocb, const unsigned char *ct, unsigned char *pt);

int ocb_done_encrypt(ocb_state *ocb, 
                     const unsigned char *pt,  unsigned long ptlen,
                           unsigned char *ct, 
                           unsigned char *tag, unsigned long *taglen);

int ocb_done_decrypt(ocb_state *ocb, 
                     const unsigned char *ct,  unsigned long ctlen,
                           unsigned char *pt, 
                     const unsigned char *tag, unsigned long taglen, int *stat);

int ocb_encrypt_authenticate_memory(int cipher,
    const unsigned char *key,    unsigned long keylen,
    const unsigned char *nonce,  
    const unsigned char *pt,     unsigned long ptlen,
          unsigned char *ct,
          unsigned char *tag,    unsigned long *taglen);

int ocb_decrypt_verify_memory(int cipher,
    const unsigned char *key,    unsigned long keylen,
    const unsigned char *nonce,  
    const unsigned char *ct,     unsigned long ctlen,
          unsigned char *pt,
    const unsigned char *tag,    unsigned long taglen,
          int           *stat);

int ocb_test(void);

/* internal functions */
void ocb_shift_xor(ocb_state *ocb, unsigned char *Z);
int ocb_ntz(unsigned long x);
int s_ocb_done(ocb_state *ocb, const unsigned char *pt, unsigned long ptlen,
               unsigned char *ct, unsigned char *tag, unsigned long *taglen, int mode);

#endif /* OCB_MODE */

#ifdef CCM_MODE

#define CCM_ENCRYPT 0
#define CCM_DECRYPT 1

int ccm_memory(int cipher,
    const unsigned char *key,    unsigned long keylen,
    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);

int ccm_test(void);

#endif /* CCM_MODE */

#ifdef GCM_MODE

#define GCM_ENCRYPT 0
#define GCM_DECRYPT 1

#define GCM_MODE_IV    0
#define GCM_MODE_AAD   1
#define GCM_MODE_TEXT  2

typedef struct { 
   symmetric_key       K;
   unsigned char       H[16],        /* multiplier */
                       X[16],        /* accumulator */
                       Y[16],        /* counter */
                       Y_0[16],      /* initial counter */
                       buf[16];      /* buffer for stuff */

   int                 cipher,       /* which cipher */
                       ivmode,       /* Which mode is the IV in? */
                       mode,         /* mode the GCM code is in */
                       buflen;       /* length of data in buf */

   ulong64             totlen,       /* 64-bit counter used for IV and AAD */
                       pttotlen;     /* 64-bit counter for the PT */

#ifdef GCM_TABLES
   unsigned char       PC[16][256][16];  /* 16 tables of 8x128 */
#endif  

} gcm_state;

void gcm_gf_mult(const unsigned char *a, const unsigned char *b, unsigned char *c);
void gcm_mult_h(gcm_state *gcm, unsigned char *I);

int gcm_init(gcm_state *gcm, int cipher,
             const unsigned char *key, int keylen);

int gcm_reset(gcm_state *gcm);

int gcm_add_iv(gcm_state *gcm, 
               const unsigned char *IV,     unsigned long IVlen);

int gcm_add_aad(gcm_state *gcm,
               const unsigned char *adata,  unsigned long adatalen);

int gcm_process(gcm_state *gcm,
                     unsigned char *pt,     unsigned long ptlen,
                     unsigned char *ct,
                     int direction);

int gcm_done(gcm_state *gcm, 
                     unsigned char *tag,    unsigned long *taglen);

int gcm_memory(      int           cipher,
               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);
int gcm_test(void);

#endif /* GCM_MODE */

#ifdef PELICAN

typedef struct pelican_state
{
    symmetric_key K;
    unsigned char state[16];
    int           buflen;
} pelican_state;

int pelican_init(pelican_state *pelmac, const unsigned char *key, unsigned long keylen);
int pelican_process(pelican_state *pelmac, const unsigned char *in, unsigned long inlen);
int pelican_done(pelican_state *pelmac, unsigned char *out);
int pelican_test(void);

int pelican_memory(const unsigned char *key, unsigned long keylen,
                   const unsigned char *in, unsigned long inlen,
                         unsigned char *out);

#endif

/* $Source: /cvs/libtom/libtomcrypt/src/headers/tomcrypt_mac.h,v $ */
/* $Revision: 1.7 $ */
/* $Date: 2005/05/05 14:35:58 $ */