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Edit File : hv_func.h \| Size : 13.10 KB
/* hash a key -------------------------------------------------------------------------------------- The "hash seed" feature was added in Perl 5.8.1 to perturb the results * to avoid "algorithmic complexity attacks". * * If USE_HASH_SEED is defined, hash randomisation is done by default * If USE_HASH_SEED_EXPLICIT is defined, hash randomisation is done * only if the environment variable PERL_HASH_SEED is set. * (see also perl.c:perl_parse() and S_init_tls_and_interp() and util.c:get_hash_seed()) / #ifndef PERL_SEEN_HV_FUNC_H / compile once / #define PERL_SEEN_HV_FUNC_H #if !( 0 \ \|\| defined(PERL_HASH_FUNC_SIPHASH) \ \|\| defined(PERL_HASH_FUNC_SIPHASH13) \ \|\| defined(PERL_HASH_FUNC_HYBRID_OAATHU_SIPHASH13) \ \|\| defined(PERL_HASH_FUNC_ONE_AT_A_TIME_HARD) \ ) #if IVSIZE == 8 #define PERL_HASH_FUNC_HYBRID_OAATHU_SIPHASH13 #else #define PERL_HASH_FUNC_ONE_AT_A_TIME_HARD #endif #endif #if defined(PERL_HASH_FUNC_SIPHASH) # define PERL_HASH_FUNC "SIPHASH_2_4" # define PERL_HASH_SEED_BYTES 16 # define PERL_HASH_WITH_SEED(seed,hash,str,len) (hash)= S_perl_hash_siphash_2_4((seed),(U8)(str),(len)) #elif defined(PERL_HASH_FUNC_SIPHASH13) # define PERL_HASH_FUNC "SIPHASH_1_3" # define PERL_HASH_SEED_BYTES 16 # define PERL_HASH_WITH_SEED(seed,hash,str,len) (hash)= S_perl_hash_siphash_1_3((seed),(U8)(str),(len)) #elif defined(PERL_HASH_FUNC_HYBRID_OAATHU_SIPHASH13) # define PERL_HASH_FUNC "HYBRID_OAATHU_SIPHASH_1_3" # define PERL_HASH_SEED_BYTES 24 # define PERL_HASH_WITH_SEED(seed,hash,str,len) (hash)= S_perl_hash_oaathu_siphash_1_3((seed),(U8)(str),(len)) #elif defined(PERL_HASH_FUNC_ONE_AT_A_TIME_HARD) # define PERL_HASH_FUNC "ONE_AT_A_TIME_HARD" # define PERL_HASH_SEED_BYTES 8 # define PERL_HASH_WITH_SEED(seed,hash,str,len) (hash)= S_perl_hash_one_at_a_time_hard((seed),(U8)(str),(len)) #endif #ifndef PERL_HASH_WITH_SEED #error "No hash function defined!" #endif #ifndef PERL_HASH_SEED_BYTES #error "PERL_HASH_SEED_BYTES not defined" #endif #ifndef PERL_HASH_FUNC #error "PERL_HASH_FUNC not defined" #endif #ifndef PERL_HASH_SEED # if defined(USE_HASH_SEED) \|\| defined(USE_HASH_SEED_EXPLICIT) # define PERL_HASH_SEED PL_hash_seed # elif PERL_HASH_SEED_BYTES == 4 # define PERL_HASH_SEED ((const U8 )"PeRl") # elif PERL_HASH_SEED_BYTES == 8 # define PERL_HASH_SEED ((const U8 )"PeRlHaSh") # elif PERL_HASH_SEED_BYTES == 16 # define PERL_HASH_SEED ((const U8 )"PeRlHaShhAcKpErl") # else # error "No PERL_HASH_SEED definition for " PERL_HASH_FUNC # endif #endif #define PERL_HASH(hash,str,len) PERL_HASH_WITH_SEED(PERL_HASH_SEED,hash,str,len) /* legacy - only mod_perl should be doing this. / #ifdef PERL_HASH_INTERNAL_ACCESS #define PERL_HASH_INTERNAL(hash,str,len) PERL_HASH(hash,str,len) #endif /----------------------------------------------------------------------------- * Endianess, misalignment capabilities and util macros * * The following 3 macros are defined in this section. The other macros defined * are only needed to help derive these 3. * * U8TO32_LE(x) Read a little endian unsigned 32-bit int * UNALIGNED_SAFE Defined if unaligned access is safe * ROTL32(x,r) Rotate x left by r bits / #if (defined(__GNUC__) && defined(__i386__)) \|\| defined(__WATCOMC__) \ \|\| defined(_MSC_VER) \|\| defined (__TURBOC__) #define U8TO16_LE(d) (((const U16 ) (d))) #endif #if !defined (U8TO16_LE) #define U8TO16_LE(d) ((((const U8 )(d))[1] << 8)\ +((const U8 )(d))[0]) #endif #if (BYTEORDER == 0x1234 \|\| BYTEORDER == 0x12345678) && U32SIZE == 4 / CPU endian matches murmurhash algorithm, so read 32-bit word directly / #define U8TO32_LE(ptr) (((const U32)(ptr))) #elif BYTEORDER == 0x4321 \|\| BYTEORDER == 0x87654321 / TODO: Add additional cases below where a compiler provided bswap32 is available / #if defined(__GNUC__) && (__GNUC__>4 \|\| (__GNUC__==4 && __GNUC_MINOR__>=3)) #define U8TO32_LE(ptr) (__builtin_bswap32(((U32)(ptr)))) #else / Without a known fast bswap32 we're just as well off doing this / #define U8TO32_LE(ptr) (ptr[0]\|ptr[1]<<8\|ptr[2]<<16\|ptr[3]<<24) #define UNALIGNED_SAFE #endif #else / Unknown endianess so last resort is to read individual bytes / #define U8TO32_LE(ptr) (ptr[0]\|ptr[1]<<8\|ptr[2]<<16\|ptr[3]<<24) / Since we're not doing word-reads we can skip the messing about with realignment / #define UNALIGNED_SAFE #endif #ifdef HAS_QUAD #ifndef U64TYPE / This probably isn't going to work, but failing with a compiler error due to lack of uint64_t is no worse than failing right now with an #error. / #define U64 uint64_t #endif #endif / Find best way to ROTL32/ROTL64 / #if defined(_MSC_VER) #include <stdlib.h> / Microsoft put _rotl declaration in here / #define ROTL32(x,r) _rotl(x,r) #ifdef HAS_QUAD #define ROTL64(x,r) _rotl64(x,r) #endif #else / gcc recognises this code and generates a rotate instruction for CPUs with one / #define ROTL32(x,r) (((U32)x << r) \| ((U32)x >> (32 - r))) #ifdef HAS_QUAD #define ROTL64(x,r) (((U64)x << r) \| ((U64)x >> (64 - r))) #endif #endif #ifdef UV_IS_QUAD #define ROTL_UV(x,r) ROTL64(x,r) #else #define ROTL_UV(x,r) ROTL32(x,r) #endif / This is SipHash by Jean-Philippe Aumasson and Daniel J. Bernstein. * The authors claim it is relatively secure compared to the alternatives * and that performance wise it is a suitable hash for languages like Perl. * See: * * https://www.131002.net/siphash/ * * This implementation seems to perform slightly slower than one-at-a-time for * short keys, but degrades slower for longer keys. Murmur Hash outperforms it * regardless of keys size. * * It is 64 bit only. / #ifdef HAS_QUAD #define U8TO64_LE(p) \ (((U64)((p)[0]) ) \| \ ((U64)((p)[1]) << 8) \| \ ((U64)((p)[2]) << 16) \| \ ((U64)((p)[3]) << 24) \| \ ((U64)((p)[4]) << 32) \| \ ((U64)((p)[5]) << 40) \| \ ((U64)((p)[6]) << 48) \| \ ((U64)((p)[7]) << 56)) #define SIPROUND \ STMT_START { \ v0 += v1; v1=ROTL64(v1,13); v1 ^= v0; v0=ROTL64(v0,32); \ v2 += v3; v3=ROTL64(v3,16); v3 ^= v2; \ v0 += v3; v3=ROTL64(v3,21); v3 ^= v0; \ v2 += v1; v1=ROTL64(v1,17); v1 ^= v2; v2=ROTL64(v2,32); \ } STMT_END / SipHash-2-4 / #define PERL_SIPHASH_FNC(FNC,SIP_ROUNDS,SIP_FINAL_ROUNDS) \ PERL_STATIC_INLINE U32 \ FNC(const unsigned char const seed, const unsigned char in, const STRLEN inlen) { \ / "somepseudorandomlygeneratedbytes" / \ U64 v0 = UINT64_C(0x736f6d6570736575); \ U64 v1 = UINT64_C(0x646f72616e646f6d); \ U64 v2 = UINT64_C(0x6c7967656e657261); \ U64 v3 = UINT64_C(0x7465646279746573); \ \ U64 b; \ U64 k0 = ((const U64)seed)[0]; \ U64 k1 = ((const U64)seed)[1]; \ U64 m; \ const int left = inlen & 7; \ const U8 end = in + inlen - left; \ \ b = ( ( U64 )(inlen) ) << 56; \ v3 ^= k1; \ v2 ^= k0; \ v1 ^= k1; \ v0 ^= k0; \ \ for ( ; in != end; in += 8 ) \ { \ m = U8TO64_LE( in ); \ v3 ^= m; \ \ SIP_ROUNDS; \ \ v0 ^= m; \ } \ \ switch( left ) \ { \ case 7: b \|= ( ( U64 )in[ 6] ) << 48; \ case 6: b \|= ( ( U64 )in[ 5] ) << 40; \ case 5: b \|= ( ( U64 )in[ 4] ) << 32; \ case 4: b \|= ( ( U64 )in[ 3] ) << 24; \ case 3: b \|= ( ( U64 )in[ 2] ) << 16; \ case 2: b \|= ( ( U64 )in[ 1] ) << 8; \ case 1: b \|= ( ( U64 )in[ 0] ); break; \ case 0: break; \ } \ \ v3 ^= b; \ \ SIP_ROUNDS; \ \ v0 ^= b; \ \ v2 ^= 0xff; \ \ SIP_FINAL_ROUNDS \ \ b = v0 ^ v1 ^ v2 ^ v3; \ return (U32)(b & U32_MAX); \ } PERL_SIPHASH_FNC( S_perl_hash_siphash_1_3 ,SIPROUND; ,SIPROUND;SIPROUND;SIPROUND; ) PERL_SIPHASH_FNC( S_perl_hash_siphash_2_4 ,SIPROUND;SIPROUND; ,SIPROUND;SIPROUND;SIPROUND;SIPROUND; ) #endif /* defined(HAS_QUAD) / / - ONE_AT_A_TIME_HARD is the 5.17+ recommend ONE_AT_A_TIME variant / / This is derived from the "One-at-a-Time" algorithm by Bob Jenkins * from requirements by Colin Plumb. * (http://burtleburtle.net/bob/hash/doobs.html) * Modified by Yves Orton to increase security for Perl 5.17 and later. / PERL_STATIC_INLINE U32 S_perl_hash_one_at_a_time_hard(const unsigned char const seed, const unsigned char str, const STRLEN len) { const unsigned char const end = (const unsigned char )str + len; U32 hash = ((const U32)seed) + (U32)len; while (str < end) { hash += (hash << 10); hash ^= (hash >> 6); hash += str++; } hash += (hash << 10); hash ^= (hash >> 6); hash += seed[4]; hash += (hash << 10); hash ^= (hash >> 6); hash += seed[5]; hash += (hash << 10); hash ^= (hash >> 6); hash += seed[6]; hash += (hash << 10); hash ^= (hash >> 6); hash += seed[7]; hash += (hash << 10); hash ^= (hash >> 6); hash += (hash << 3); hash ^= (hash >> 11); return (hash + (hash << 15)); } #ifdef HAS_QUAD /* Hybrid hash function * * For short strings, 16 bytes or shorter, we use an optimised variant * of One At A Time Hard, and for longer strings, we use siphash_1_3. * * The optimisation of One At A Time Hard means we read the key in * reverse from normal, but by doing so we avoid the loop overhead. / PERL_STATIC_INLINE U32 S_perl_hash_oaathu_siphash_1_3(const unsigned char const seed, const unsigned char str, const STRLEN len) { U32 hash = ((const U32)seed) + (U32)len; switch (len) { case 16: hash += (hash << 10); hash ^= (hash >> 6); hash += str[15]; case 15: hash += (hash << 10); hash ^= (hash >> 6); hash += str[14]; case 14: hash += (hash << 10); hash ^= (hash >> 6); hash += str[13]; case 13: hash += (hash << 10); hash ^= (hash >> 6); hash += str[12]; case 12: hash += (hash << 10); hash ^= (hash >> 6); hash += str[11]; case 11: hash += (hash << 10); hash ^= (hash >> 6); hash += str[10]; case 10: hash += (hash << 10); hash ^= (hash >> 6); hash += str[9]; case 9: hash += (hash << 10); hash ^= (hash >> 6); hash += str[8]; case 8: hash += (hash << 10); hash ^= (hash >> 6); hash += str[7]; case 7: hash += (hash << 10); hash ^= (hash >> 6); hash += str[6]; case 6: hash += (hash << 10); hash ^= (hash >> 6); hash += str[5]; case 5: hash += (hash << 10); hash ^= (hash >> 6); hash += str[4]; case 4: hash += (hash << 10); hash ^= (hash >> 6); hash += str[3]; case 3: hash += (hash << 10); hash ^= (hash >> 6); hash += str[2]; case 2: hash += (hash << 10); hash ^= (hash >> 6); hash += str[1]; case 1: hash += (hash << 10); hash ^= (hash >> 6); hash += str[0]; case 0: hash += (hash << 10); hash ^= (hash >> 6); hash += seed[4]; hash += (hash << 10); hash ^= (hash >> 6); hash += seed[5]; hash += (hash << 10); hash ^= (hash >> 6); hash += seed[6]; hash += (hash << 10); hash ^= (hash >> 6); hash += seed[7]; hash += (hash << 10); hash ^= (hash >> 6); hash += (hash << 3); hash ^= (hash >> 11); return (hash + (hash << 15)); } return S_perl_hash_siphash_1_3(seed+8, str, len); } #endif / defined(HAS_QUAD) / #endif /compile once/ / * ex: set ts=8 sts=4 sw=4 et: */ Back

Edit File : hv_func.h | Size : 13.10 KB

/* hash a key
 *--------------------------------------------------------------------------------------
 * The "hash seed" feature was added in Perl 5.8.1 to perturb the results
 * to avoid "algorithmic complexity attacks".
 *
 * If USE_HASH_SEED is defined, hash randomisation is done by default
 * If USE_HASH_SEED_EXPLICIT is defined, hash randomisation is done
 * only if the environment variable PERL_HASH_SEED is set.
 * (see also perl.c:perl_parse() and S_init_tls_and_interp() and util.c:get_hash_seed())
 */

#ifndef PERL_SEEN_HV_FUNC_H /* compile once */
#define PERL_SEEN_HV_FUNC_H

#if !( 0 \
        || defined(PERL_HASH_FUNC_SIPHASH) \
        || defined(PERL_HASH_FUNC_SIPHASH13) \
        || defined(PERL_HASH_FUNC_HYBRID_OAATHU_SIPHASH13) \
        || defined(PERL_HASH_FUNC_ONE_AT_A_TIME_HARD) \
    )
#if IVSIZE == 8
#define PERL_HASH_FUNC_HYBRID_OAATHU_SIPHASH13
#else
#define PERL_HASH_FUNC_ONE_AT_A_TIME_HARD
#endif
#endif

#if defined(PERL_HASH_FUNC_SIPHASH)
#   define PERL_HASH_FUNC "SIPHASH_2_4"
#   define PERL_HASH_SEED_BYTES 16
#   define PERL_HASH_WITH_SEED(seed,hash,str,len) (hash)= S_perl_hash_siphash_2_4((seed),(U8*)(str),(len))
#elif defined(PERL_HASH_FUNC_SIPHASH13)
#   define PERL_HASH_FUNC "SIPHASH_1_3"
#   define PERL_HASH_SEED_BYTES 16
#   define PERL_HASH_WITH_SEED(seed,hash,str,len) (hash)= S_perl_hash_siphash_1_3((seed),(U8*)(str),(len))
#elif defined(PERL_HASH_FUNC_HYBRID_OAATHU_SIPHASH13)
#   define PERL_HASH_FUNC "HYBRID_OAATHU_SIPHASH_1_3"
#   define PERL_HASH_SEED_BYTES 24
#   define PERL_HASH_WITH_SEED(seed,hash,str,len) (hash)= S_perl_hash_oaathu_siphash_1_3((seed),(U8*)(str),(len))
#elif defined(PERL_HASH_FUNC_ONE_AT_A_TIME_HARD)
#   define PERL_HASH_FUNC "ONE_AT_A_TIME_HARD"
#   define PERL_HASH_SEED_BYTES 8
#   define PERL_HASH_WITH_SEED(seed,hash,str,len) (hash)= S_perl_hash_one_at_a_time_hard((seed),(U8*)(str),(len))
#endif

#ifndef PERL_HASH_WITH_SEED
#error "No hash function defined!"
#endif
#ifndef PERL_HASH_SEED_BYTES
#error "PERL_HASH_SEED_BYTES not defined"
#endif
#ifndef PERL_HASH_FUNC
#error "PERL_HASH_FUNC not defined"
#endif

#ifndef PERL_HASH_SEED
#   if defined(USE_HASH_SEED) || defined(USE_HASH_SEED_EXPLICIT)
#       define PERL_HASH_SEED PL_hash_seed
#   elif PERL_HASH_SEED_BYTES == 4
#       define PERL_HASH_SEED ((const U8 *)"PeRl")
#   elif PERL_HASH_SEED_BYTES == 8
#       define PERL_HASH_SEED ((const U8 *)"PeRlHaSh")
#   elif PERL_HASH_SEED_BYTES == 16
#       define PERL_HASH_SEED ((const U8 *)"PeRlHaShhAcKpErl")
#   else
#       error "No PERL_HASH_SEED definition for " PERL_HASH_FUNC
#   endif
#endif

#define PERL_HASH(hash,str,len) PERL_HASH_WITH_SEED(PERL_HASH_SEED,hash,str,len)

/* legacy - only mod_perl should be doing this.  */
#ifdef PERL_HASH_INTERNAL_ACCESS
#define PERL_HASH_INTERNAL(hash,str,len) PERL_HASH(hash,str,len)
#endif

/*-----------------------------------------------------------------------------
 * Endianess, misalignment capabilities and util macros
 *
 * The following 3 macros are defined in this section. The other macros defined
 * are only needed to help derive these 3.
 *
 * U8TO32_LE(x)   Read a little endian unsigned 32-bit int
 * UNALIGNED_SAFE   Defined if unaligned access is safe
 * ROTL32(x,r)      Rotate x left by r bits
 */

#if (defined(__GNUC__) && defined(__i386__)) || defined(__WATCOMC__) \
  || defined(_MSC_VER) || defined (__TURBOC__)
#define U8TO16_LE(d) (*((const U16 *) (d)))
#endif

#if !defined (U8TO16_LE)
#define U8TO16_LE(d) ((((const U8 *)(d))[1] << 8)\
                      +((const U8 *)(d))[0])
#endif

#if (BYTEORDER == 0x1234 || BYTEORDER == 0x12345678) && U32SIZE == 4
  /* CPU endian matches murmurhash algorithm, so read 32-bit word directly */
  #define U8TO32_LE(ptr)   (*((const U32*)(ptr)))
#elif BYTEORDER == 0x4321 || BYTEORDER == 0x87654321
  /* TODO: Add additional cases below where a compiler provided bswap32 is available */
  #if defined(__GNUC__) && (__GNUC__>4 || (__GNUC__==4 && __GNUC_MINOR__>=3))
    #define U8TO32_LE(ptr)   (__builtin_bswap32(*((U32*)(ptr))))
  #else
    /* Without a known fast bswap32 we're just as well off doing this */
    #define U8TO32_LE(ptr)   (ptr[0]|ptr[1]<<8|ptr[2]<<16|ptr[3]<<24)
    #define UNALIGNED_SAFE
  #endif
#else
  /* Unknown endianess so last resort is to read individual bytes */
  #define U8TO32_LE(ptr)   (ptr[0]|ptr[1]<<8|ptr[2]<<16|ptr[3]<<24)
  /* Since we're not doing word-reads we can skip the messing about with realignment */
  #define UNALIGNED_SAFE
#endif

#ifdef HAS_QUAD
#ifndef U64TYPE
/* This probably isn't going to work, but failing with a compiler error due to
   lack of uint64_t is no worse than failing right now with an #error.  */
#define U64 uint64_t
#endif
#endif

/* Find best way to ROTL32/ROTL64 */
#if defined(_MSC_VER)
  #include <stdlib.h>  /* Microsoft put _rotl declaration in here */
  #define ROTL32(x,r)  _rotl(x,r)
  #ifdef HAS_QUAD
    #define ROTL64(x,r)  _rotl64(x,r)
  #endif
#else
  /* gcc recognises this code and generates a rotate instruction for CPUs with one */
  #define ROTL32(x,r)  (((U32)x << r) | ((U32)x >> (32 - r)))
  #ifdef HAS_QUAD
    #define ROTL64(x,r)  (((U64)x << r) | ((U64)x >> (64 - r)))
  #endif
#endif

#ifdef UV_IS_QUAD
#define ROTL_UV(x,r) ROTL64(x,r)
#else
#define ROTL_UV(x,r) ROTL32(x,r)
#endif

/* This is SipHash by Jean-Philippe Aumasson and Daniel J. Bernstein.
 * The authors claim it is relatively secure compared to the alternatives
 * and that performance wise it is a suitable hash for languages like Perl.
 * See:
 *
 * https://www.131002.net/siphash/
 *
 * This implementation seems to perform slightly slower than one-at-a-time for
 * short keys, but degrades slower for longer keys. Murmur Hash outperforms it
 * regardless of keys size.
 *
 * It is 64 bit only.
 */

#ifdef HAS_QUAD

#define U8TO64_LE(p) \
  (((U64)((p)[0])      ) | \
   ((U64)((p)[1]) <<  8) | \
   ((U64)((p)[2]) << 16) | \
   ((U64)((p)[3]) << 24) | \
   ((U64)((p)[4]) << 32) | \
   ((U64)((p)[5]) << 40) | \
   ((U64)((p)[6]) << 48) | \
   ((U64)((p)[7]) << 56))

#define SIPROUND            \
  STMT_START {              \
    v0 += v1; v1=ROTL64(v1,13); v1 ^= v0; v0=ROTL64(v0,32); \
    v2 += v3; v3=ROTL64(v3,16); v3 ^= v2;     \
    v0 += v3; v3=ROTL64(v3,21); v3 ^= v0;     \
    v2 += v1; v1=ROTL64(v1,17); v1 ^= v2; v2=ROTL64(v2,32); \
  } STMT_END

/* SipHash-2-4 */

#define PERL_SIPHASH_FNC(FNC,SIP_ROUNDS,SIP_FINAL_ROUNDS) \
PERL_STATIC_INLINE U32 \
FNC(const unsigned char * const seed, const unsigned char *in, const STRLEN inlen) { \
  /* "somepseudorandomlygeneratedbytes" */  \
  U64 v0 = UINT64_C(0x736f6d6570736575);    \
  U64 v1 = UINT64_C(0x646f72616e646f6d);    \
  U64 v2 = UINT64_C(0x6c7967656e657261);    \
  U64 v3 = UINT64_C(0x7465646279746573);    \
                                            \
  U64 b;                                    \
  U64 k0 = ((const U64*)seed)[0];           \
  U64 k1 = ((const U64*)seed)[1];           \
  U64 m;                                    \
  const int left = inlen & 7;               \
  const U8 *end = in + inlen - left;        \
                                            \
  b = ( ( U64 )(inlen) ) << 56;             \
  v3 ^= k1;                                 \
  v2 ^= k0;                                 \
  v1 ^= k1;                                 \
  v0 ^= k0;                                 \
                                            \
  for ( ; in != end; in += 8 )              \
  {                                         \
    m = U8TO64_LE( in );                    \
    v3 ^= m;                                \
                                            \
    SIP_ROUNDS;                             \
                                            \
    v0 ^= m;                                \
  }                                         \
                                            \
  switch( left )                            \
  {                                         \
  case 7: b |= ( ( U64 )in[ 6] )  << 48;    \
  case 6: b |= ( ( U64 )in[ 5] )  << 40;    \
  case 5: b |= ( ( U64 )in[ 4] )  << 32;    \
  case 4: b |= ( ( U64 )in[ 3] )  << 24;    \
  case 3: b |= ( ( U64 )in[ 2] )  << 16;    \
  case 2: b |= ( ( U64 )in[ 1] )  <<  8;    \
  case 1: b |= ( ( U64 )in[ 0] ); break;    \
  case 0: break;                            \
  }                                         \
                                            \
  v3 ^= b;                                  \
                                            \
  SIP_ROUNDS;                               \
                                            \
  v0 ^= b;                                  \
                                            \
  v2 ^= 0xff;                               \
                                            \
  SIP_FINAL_ROUNDS                          \
                                            \
  b = v0 ^ v1 ^ v2  ^ v3;                   \
  return (U32)(b & U32_MAX);                \
}

PERL_SIPHASH_FNC(
    S_perl_hash_siphash_1_3
    ,SIPROUND;
    ,SIPROUND;SIPROUND;SIPROUND;
)

PERL_SIPHASH_FNC(
    S_perl_hash_siphash_2_4
    ,SIPROUND;SIPROUND;
    ,SIPROUND;SIPROUND;SIPROUND;SIPROUND;
)

#endif /* defined(HAS_QUAD) */

/* - ONE_AT_A_TIME_HARD is the 5.17+ recommend ONE_AT_A_TIME variant */

/* This is derived from the "One-at-a-Time" algorithm by Bob Jenkins
 * from requirements by Colin Plumb.
 * (http://burtleburtle.net/bob/hash/doobs.html)
 * Modified by Yves Orton to increase security for Perl 5.17 and later.
 */
PERL_STATIC_INLINE U32
S_perl_hash_one_at_a_time_hard(const unsigned char * const seed, const unsigned char *str, const STRLEN len) {
    const unsigned char * const end = (const unsigned char *)str + len;
    U32 hash = *((const U32*)seed) + (U32)len;
    
    while (str < end) {
        hash += (hash << 10);
        hash ^= (hash >> 6);
        hash += *str++;
    }
    
    hash += (hash << 10);
    hash ^= (hash >> 6);
    hash += seed[4];
    
    hash += (hash << 10);
    hash ^= (hash >> 6);
    hash += seed[5];
    
    hash += (hash << 10);
    hash ^= (hash >> 6);
    hash += seed[6];
    
    hash += (hash << 10);
    hash ^= (hash >> 6);
    hash += seed[7];
    
    hash += (hash << 10);
    hash ^= (hash >> 6);

hash += (hash << 3);
    hash ^= (hash >> 11);
    return (hash + (hash << 15));
}

#ifdef HAS_QUAD

/* Hybrid hash function
 *
 * For short strings, 16 bytes or shorter, we use an optimised variant
 * of One At A Time Hard, and for longer strings, we use siphash_1_3.
 *
 * The optimisation of One At A Time Hard means we read the key in
 * reverse from normal, but by doing so we avoid the loop overhead.
 */
PERL_STATIC_INLINE U32
S_perl_hash_oaathu_siphash_1_3(const unsigned char * const seed, const unsigned char *str, const STRLEN len) {
    U32 hash = *((const U32*)seed) + (U32)len;
    switch (len) {
        case 16:
            hash += (hash << 10);
            hash ^= (hash >> 6);
            hash += str[15];
        case 15:
            hash += (hash << 10);
            hash ^= (hash >> 6);
            hash += str[14];
        case 14:
            hash += (hash << 10);
            hash ^= (hash >> 6);
            hash += str[13];
        case 13:
            hash += (hash << 10);
            hash ^= (hash >> 6);
            hash += str[12];
        case 12:
            hash += (hash << 10);
            hash ^= (hash >> 6);
            hash += str[11];
        case 11:
            hash += (hash << 10);
            hash ^= (hash >> 6);
            hash += str[10];
        case 10:
            hash += (hash << 10);
            hash ^= (hash >> 6);
            hash += str[9];
        case 9:
            hash += (hash << 10);
            hash ^= (hash >> 6);
            hash += str[8];
        case 8:
            hash += (hash << 10);
            hash ^= (hash >> 6);
            hash += str[7];
        case 7:
            hash += (hash << 10);
            hash ^= (hash >> 6);
            hash += str[6];
        case 6:
            hash += (hash << 10);
            hash ^= (hash >> 6);
            hash += str[5];
        case 5:
            hash += (hash << 10);
            hash ^= (hash >> 6);
            hash += str[4];
        case 4:
            hash += (hash << 10);
            hash ^= (hash >> 6);
            hash += str[3];
        case 3:
            hash += (hash << 10);
            hash ^= (hash >> 6);
            hash += str[2];
        case 2:
            hash += (hash << 10);
            hash ^= (hash >> 6);
            hash += str[1];
        case 1:
            hash += (hash << 10);
            hash ^= (hash >> 6);
            hash += str[0];
        case 0:
            hash += (hash << 10);
            hash ^= (hash >> 6);
            hash += seed[4];
            hash += (hash << 10);
            hash ^= (hash >> 6);
            hash += seed[5];
            hash += (hash << 10);
            hash ^= (hash >> 6);
            hash += seed[6];
            hash += (hash << 10);
            hash ^= (hash >> 6);
            hash += seed[7];
            hash += (hash << 10);
            hash ^= (hash >> 6);

hash += (hash << 3);
            hash ^= (hash >> 11);
            return (hash + (hash << 15));
    }
    return S_perl_hash_siphash_1_3(seed+8, str, len);
}
#endif /* defined(HAS_QUAD) */

#endif /*compile once*/

/*
 * ex: set ts=8 sts=4 sw=4 et:
 */

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