/* ---- HASH FUNCTIONS ---- */
#ifdef SHA512
struct sha512_state {
    ulong64  length, state[8];
    unsigned long curlen;
    unsigned char buf[128];
};
#endif

#ifdef SHA256
struct sha256_state {
    ulong64 length;
    ulong32 state[8], curlen;
    unsigned char buf[64];
};
#endif

#ifdef SHA1
struct sha1_state {
    ulong64 length;
    ulong32 state[5], curlen;
    unsigned char buf[64];
};
#endif

#ifdef MD5
struct md5_state {
    ulong64 length;
    ulong32 state[4], curlen;
    unsigned char buf[64];
};
#endif

#ifdef MD4
struct md4_state {
    ulong64 length;
    ulong32 state[4], curlen;
    unsigned char buf[64];
};
#endif

#ifdef TIGER
struct tiger_state {
    ulong64 state[3], length;
    unsigned long curlen;
    unsigned char buf[64];
};
#endif

#ifdef MD2
struct md2_state {
    unsigned char chksum[16], X[48], buf[16];
    unsigned long curlen;
};
#endif

#ifdef RIPEMD128
struct rmd128_state {
    ulong64 length;
    unsigned char buf[64];
    ulong32 curlen, state[4];
};
#endif

#ifdef RIPEMD160
struct rmd160_state {
    ulong64 length;
    unsigned char buf[64];
    ulong32 curlen, state[5];
};
#endif

#ifdef WHIRLPOOL
struct whirlpool_state {
    ulong64 length, state[8];
    unsigned char buf[64];
    ulong32 curlen;
};
#endif

#ifdef CHC_HASH
struct chc_state {
    ulong64 length;
    unsigned char state[MAXBLOCKSIZE], buf[MAXBLOCKSIZE];
    ulong32 curlen;
};
#endif

typedef union Hash_state {
#ifdef CHC_HASH
    struct chc_state chc;
#endif
#ifdef WHIRLPOOL
    struct whirlpool_state whirlpool;
#endif
#ifdef SHA512
    struct sha512_state sha512;
#endif
#ifdef SHA256
    struct sha256_state sha256;
#endif
#ifdef SHA1
    struct sha1_state   sha1;
#endif
#ifdef MD5
    struct md5_state    md5;
#endif
#ifdef MD4
    struct md4_state    md4;
#endif
#ifdef MD2
    struct md2_state    md2;
#endif
#ifdef TIGER
    struct tiger_state  tiger;
#endif
#ifdef RIPEMD128
    struct rmd128_state rmd128;
#endif
#ifdef RIPEMD160
    struct rmd160_state rmd160;
#endif
    void *data;
} hash_state;

extern  struct ltc_hash_descriptor {
    /** name of hash */
    char *name;
    /** internal ID */
    unsigned char ID;
    /** Size of digest in octets */
    unsigned long hashsize;
    /** Input block size in octets */
    unsigned long blocksize;
    /** ASN.1 DER identifier */
    unsigned char DER[64];
    /** Length of DER encoding */
    unsigned long DERlen;
    /** Init a hash state
      @param hash   The hash to initialize
      @return CRYPT_OK if successful
    */
    int (*init)(hash_state *hash);
    /** Process a block of data 
      @param hash   The hash state
      @param in     The data to hash
      @param inlen  The length of the data (octets)
      @return CRYPT_OK if successful
    */
    int (*process)(hash_state *hash, const unsigned char *in, unsigned long inlen);
    /** Produce the digest and store it
      @param hash   The hash state
      @param out    [out] The destination of the digest
      @return CRYPT_OK if successful
    */
    int (*done)(hash_state *hash, unsigned char *out);
    /** Self-test
      @return CRYPT_OK if successful, CRYPT_NOP if self-tests have been disabled
    */
    int (*test)(void);
} hash_descriptor[];

#ifdef CHC_HASH
int chc_register(int cipher);
int chc_init(hash_state * md);
int chc_process(hash_state * md, const unsigned char *in, unsigned long inlen);
int chc_done(hash_state * md, unsigned char *hash);
int chc_test(void);
extern const struct ltc_hash_descriptor chc_desc;
#endif

#ifdef WHIRLPOOL
int whirlpool_init(hash_state * md);
int whirlpool_process(hash_state * md, const unsigned char *in, unsigned long inlen);
int whirlpool_done(hash_state * md, unsigned char *hash);
int whirlpool_test(void);
extern const struct ltc_hash_descriptor whirlpool_desc;
#endif

#ifdef SHA512
int sha512_init(hash_state * md);
int sha512_process(hash_state * md, const unsigned char *in, unsigned long inlen);
int sha512_done(hash_state * md, unsigned char *hash);
int sha512_test(void);
extern const struct ltc_hash_descriptor sha512_desc;
#endif

#ifdef SHA384
#ifndef SHA512
   #error SHA512 is required for SHA384
#endif
int sha384_init(hash_state * md);
#define sha384_process sha512_process
int sha384_done(hash_state * md, unsigned char *hash);
int sha384_test(void);
extern const struct ltc_hash_descriptor sha384_desc;
#endif

#ifdef SHA256
int sha256_init(hash_state * md);
int sha256_process(hash_state * md, const unsigned char *in, unsigned long inlen);
int sha256_done(hash_state * md, unsigned char *hash);
int sha256_test(void);
extern const struct ltc_hash_descriptor sha256_desc;

#ifdef SHA224
#ifndef SHA256
   #error SHA256 is required for SHA224
#endif
int sha224_init(hash_state * md);
#define sha224_process sha256_process
int sha224_done(hash_state * md, unsigned char *hash);
int sha224_test(void);
extern const struct ltc_hash_descriptor sha224_desc;
#endif
#endif

#ifdef SHA1
int sha1_init(hash_state * md);
int sha1_process(hash_state * md, const unsigned char *in, unsigned long inlen);
int sha1_done(hash_state * md, unsigned char *hash);
int sha1_test(void);
extern const struct ltc_hash_descriptor sha1_desc;
#endif

#ifdef MD5
int md5_init(hash_state * md);
int md5_process(hash_state * md, const unsigned char *in, unsigned long inlen);
int md5_done(hash_state * md, unsigned char *hash);
int md5_test(void);
extern const struct ltc_hash_descriptor md5_desc;
#endif

#ifdef MD4
int md4_init(hash_state * md);
int md4_process(hash_state * md, const unsigned char *in, unsigned long inlen);
int md4_done(hash_state * md, unsigned char *hash);
int md4_test(void);
extern const struct ltc_hash_descriptor md4_desc;
#endif

#ifdef MD2
int md2_init(hash_state * md);
int md2_process(hash_state * md, const unsigned char *in, unsigned long inlen);
int md2_done(hash_state * md, unsigned char *hash);
int md2_test(void);
extern const struct ltc_hash_descriptor md2_desc;
#endif

#ifdef TIGER
int tiger_init(hash_state * md);
int tiger_process(hash_state * md, const unsigned char *in, unsigned long inlen);
int tiger_done(hash_state * md, unsigned char *hash);
int tiger_test(void);
extern const struct ltc_hash_descriptor tiger_desc;
#endif

#ifdef RIPEMD128
int rmd128_init(hash_state * md);
int rmd128_process(hash_state * md, const unsigned char *in, unsigned long inlen);
int rmd128_done(hash_state * md, unsigned char *hash);
int rmd128_test(void);
extern const struct ltc_hash_descriptor rmd128_desc;
#endif

#ifdef RIPEMD160
int rmd160_init(hash_state * md);
int rmd160_process(hash_state * md, const unsigned char *in, unsigned long inlen);
int rmd160_done(hash_state * md, unsigned char *hash);
int rmd160_test(void);
extern const struct ltc_hash_descriptor rmd160_desc;
#endif

int find_hash(const char *name);
int find_hash_id(unsigned char ID);
int find_hash_any(const char *name, int digestlen);
int register_hash(const struct ltc_hash_descriptor *hash);
int unregister_hash(const struct ltc_hash_descriptor *hash);
int hash_is_valid(int idx);

int hash_memory(int hash, 
                const unsigned char *in,  unsigned long inlen, 
                      unsigned char *out, unsigned long *outlen);
int hash_memory_multi(int hash, unsigned char *out, unsigned long *outlen,
                      const unsigned char *in, unsigned long inlen, ...);
int hash_filehandle(int hash, FILE *in, unsigned char *out, unsigned long *outlen);
int hash_file(int hash, const char *fname, unsigned char *out, unsigned long *outlen);

/* a simple macro for making hash "process" functions */
#define HASH_PROCESS(func_name, compress_name, state_var, block_size)                       \
int func_name (hash_state * md, const unsigned char *in, unsigned long inlen)               \
{                                                                                           \
    unsigned long n;                                                                        \
    int           err;                                                                      \
    LTC_ARGCHK(md != NULL);                                                                    \
    LTC_ARGCHK(in != NULL);                                                                   \
    if (md-> state_var .curlen > sizeof(md-> state_var .buf)) {                             \
       return CRYPT_INVALID_ARG;                                                            \
    }                                                                                       \
    while (inlen > 0) {                                                                       \
        if (md-> state_var .curlen == 0 && inlen >= block_size) {                             \
           if ((err = compress_name (md, (unsigned char *)in)) != CRYPT_OK) { \
              return err;         \
           }                                        \
           md-> state_var .length += block_size * 8;                                        \
           in             += block_size;                                                   \
           inlen          -= block_size;                                                   \
        } else {                                                                            \
           n = MIN(inlen, (block_size - md-> state_var .curlen));                             \
           memcpy(md-> state_var .buf + md-> state_var.curlen, in, (size_t)n);             \
           md-> state_var .curlen += n;                                                     \
           in             += n;                                                            \
           inlen          -= n;                                                            \
           if (md-> state_var .curlen == block_size) {                                      \
              if ((err = compress_name (md, md-> state_var .buf)) != CRYPT_OK) {\
                 return err;                                      \
              } \
              md-> state_var .length += 8*block_size;                                       \
              md-> state_var .curlen = 0;                                                   \
           }                                                                                \
       }                                                                                    \
    }                                                                                       \
    return CRYPT_OK;                                                                        \
}