/* LibTomCrypt, modular cryptographic library -- Tom St Denis
 *
 * LibTomCrypt is a library that provides various cryptographic
 * algorithms in a highly modular and flexible manner.
 *
 * The library is free for all purposes without any express
 * guarantee it works.
 */

/* ---- HASH FUNCTIONS ---- */
#ifdef LTC_SHA3
struct sha3_state {
    ulong64 saved;                  /* the portion of the input message that we didn't consume yet */
    ulong64 s[25];
    unsigned char sb[25 * 8];       /* used for storing `ulong64 s[25]` as little-endian bytes */
    unsigned short byte_index;      /* 0..7--the next byte after the set one (starts from 0; 0--none are buffered) */
    unsigned short word_index;      /* 0..24--the next word to integrate input (starts from 0) */
    unsigned short capacity_words;  /* the double size of the hash output in words (e.g. 16 for Keccak 512) */
    unsigned short xof_flag;
};
#endif

#ifdef LTC_SHA512
struct sha512_state {
    ulong64  length, state[8];
    unsigned long curlen;
    unsigned char buf[128];
};
#endif

#ifdef LTC_SHA256
struct sha256_state {
    ulong64 length;
    ulong32 state[8], curlen;
    unsigned char buf[64];
};
#endif

#ifdef LTC_SHA1
struct sha1_state {
    ulong64 length;
    ulong32 state[5], curlen;
    unsigned char buf[64];
};
#endif

#ifdef LTC_MD5
struct md5_state {
    ulong64 length;
    ulong32 state[4], curlen;
    unsigned char buf[64];
};
#endif

#ifdef LTC_MD4
struct md4_state {
    ulong64 length;
    ulong32 state[4], curlen;
    unsigned char buf[64];
};
#endif

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

#ifdef LTC_MD2
struct md2_state {
    unsigned char chksum[16], X[48], buf[16];
    unsigned long curlen;
};
#endif

#ifdef LTC_RIPEMD128
struct rmd128_state {
    ulong64 length;
    unsigned char buf[64];
    ulong32 curlen, state[4];
};
#endif

#ifdef LTC_RIPEMD160
struct rmd160_state {
    ulong64 length;
    unsigned char buf[64];
    ulong32 curlen, state[5];
};
#endif

#ifdef LTC_RIPEMD256
struct rmd256_state {
    ulong64 length;
    unsigned char buf[64];
    ulong32 curlen, state[8];
};
#endif

#ifdef LTC_RIPEMD320
struct rmd320_state {
    ulong64 length;
    unsigned char buf[64];
    ulong32 curlen, state[10];
};
#endif

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

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

#ifdef LTC_BLAKE2S
struct blake2s_state {
    ulong32 h[8];
    ulong32 t[2];
    ulong32 f[2];
    unsigned char buf[64];
    unsigned long curlen;
    unsigned long outlen;
    unsigned char last_node;
};
#endif

#ifdef LTC_BLAKE2B
struct blake2b_state {
    ulong64 h[8];
    ulong64 t[2];
    ulong64 f[2];
    unsigned char buf[128];
    unsigned long curlen;
    unsigned long outlen;
    unsigned char last_node;
};
#endif

typedef union Hash_state {
    char dummy[1];
#ifdef LTC_CHC_HASH
    struct chc_state chc;
#endif
#ifdef LTC_WHIRLPOOL
    struct whirlpool_state whirlpool;
#endif
#ifdef LTC_SHA3
    struct sha3_state sha3;
#endif
#ifdef LTC_SHA512
    struct sha512_state sha512;
#endif
#ifdef LTC_SHA256
    struct sha256_state sha256;
#endif
#ifdef LTC_SHA1
    struct sha1_state   sha1;
#endif
#ifdef LTC_MD5
    struct md5_state    md5;
#endif
#ifdef LTC_MD4
    struct md4_state    md4;
#endif
#ifdef LTC_MD2
    struct md2_state    md2;
#endif
#ifdef LTC_TIGER
    struct tiger_state  tiger;
#endif
#ifdef LTC_RIPEMD128
    struct rmd128_state rmd128;
#endif
#ifdef LTC_RIPEMD160
    struct rmd160_state rmd160;
#endif
#ifdef LTC_RIPEMD256
    struct rmd256_state rmd256;
#endif
#ifdef LTC_RIPEMD320
    struct rmd320_state rmd320;
#endif
#ifdef LTC_BLAKE2S
    struct blake2s_state blake2s;
#endif
#ifdef LTC_BLAKE2B
    struct blake2b_state blake2b;
#endif

    void *data;
} hash_state;

/** hash descriptor */
extern  struct ltc_hash_descriptor {
    /** name of hash */
    const 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 OID */
    unsigned long OID[16];
    /** Length of DER encoding */
    unsigned long OIDlen;

    /** 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);