index : vpp	master stable/1606 stable/1609 stable/1701 stable/1704 stable/1707 stable/1710 stable/1801 stable/1804 stable/1807 stable/1810 stable/1901 stable/1904 stable/1908 stable/2001 stable/2005 stable/2009 stable/2101 stable/2106 stable/2110 stable/2202 stable/2206 stable/2210 stable/2302 stable/2306 stable/2310 stable/2402 stable/2406 stable/2410 stable/test
	Vector Packet Processing	Grokmirror user

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Age	Commit message (Expand)	Author	Files	Lines
2017-01-01	Move java,lua api and remaining plugins to src/	Damjan Marion	9	-951/+0
2016-12-02	API: Packaging of JSON files.	Ole Troan	1	-1/+10
2016-11-21	Add client-side msg_name_and_crc -> msg_index table	Dave Barach	1	-0/+16
2016-11-09	Update sample plugin and plugin skeletons: use driver feature arc	Dave Barach	2	-13/+38
2016-07-08	Multiple changes in the plugin build infra	Damjan Marion	2	-22/+14
2016-07-02	Finish cleanup of .../plugins/{configure.ac, Makefile.am}	Dave Barach	1	-0/+1
2016-06-27	Plugins: Clean up the plugin directory so that each plugin has its own	Ole Troan	1	-3/+2
2016-05-23	Create /plugins directory, move sample-plugin	Dave Barach	9	-0/+909

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/*
 * Copyright (c) 2015 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
  ------------------------------------------------------------------------------
  By Bob Jenkins, 1996, Public Domain
  MODIFIED:
  960327: Creation (addition of randinit, really)
  970719: use context, not global variables, for internal state
  980324: renamed seed to flag
  980605: recommend ISAAC_LOG2_SIZE=4 for noncryptography.
  010626: note this is public domain
  ------------------------------------------------------------------------------

  Modified for CLIB by Eliot Dresselhaus.
  Dear Bob, Thanks for all the great work. - Eliot

  modifications copyright (c) 2003 Eliot Dresselhaus

  Permission is hereby granted, free of charge, to any person obtaining
  a copy of this software and associated documentation files (the
  "Software"), to deal in the Software without restriction, including
  without limitation the rights to use, copy, modify, merge, publish,
  distribute, sublicense, and/or sell copies of the Software, and to
  permit persons to whom the Software is furnished to do so, subject to
  the following conditions:

  The above copyright notice and this permission notice shall be
  included in all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

/* ISAAC is Bob Jenkins' random number generator.
   http://burtleburtle.net/bob/rand/isaacafa.html */

#include <vppinfra/random_isaac.h>

#if uword_bits != 32 && uword_bits != 64
#error "isaac only works for 32 or 64 bit words"
#endif

#if uword_bits == 32

#define ind32(mm,x)  (*(u32 *)((u8 *)(mm) + ((x) & ((ISAAC_SIZE-1)<<2))))
#define rngstep32(mix,a,b,mm,m,m2,r,x,y)		\
{							\
  x = *m;						\
  a = (a^(mix)) + *(m2++);				\
  *(m++) = y = ind32(mm,x) + a + b;			\
  *(r++) = b = ind32(mm,y>>ISAAC_LOG2_SIZE) + x;	\
}

void
isaac (isaac_t * ctx, uword * results)
{
  u32 a, b, c, x, y, *m, *mm, *m2, *r, *mend;

  mm = ctx->memory;
  r = results;
  a = ctx->a;
  b = ctx->b;
  c = ctx->c;

  b += ++c;
  mend = m2 = mm + ARRAY_LEN (ctx->memory) / 2;
  m = mm;
  while (m < mend)
    {
      rngstep32 (a << 13, a, b, mm, m, m2, r, x, y);
      rngstep32 (a >> 6, a, b, mm, m, m2, r, x, y);
      rngstep32 (a << 2, a, b, mm, m, m2, r, x, y);
      rngstep32 (a >> 16, a, b, mm, m, m2, r, x, y);
    }

  m2 = mm;
  while (m2 < mend)
    {
      rngstep32 (a << 13, a, b, mm, m, m2, r, x, y);
      rngstep32 (a >> 6, a, b, mm, m, m2, r, x, y);
      rngstep32 (a << 2, a, b, mm, m, m2, r, x, y);
      rngstep32 (a >> 16, a, b, mm, m, m2, r, x, y);
    }

  ctx->a = a;
  ctx->b = b;
  ctx->c = c;
}

/* Perform 2 isaac runs with different contexts simultaneously. */
void
isaac2 (isaac_t * ctx, uword * results)
{
#define _(n) \
  u32 a##n, b##n, c##n, x##n, y##n, * m##n, * mm##n, * m2##n, * r##n, * mend##n

  _(0);
  _(1);
  (void) mend1;			/* "set but unused variable" error on mend1 with gcc 4.9  */
#undef _

#define _(n)							\
do {								\
  mm##n = ctx[(n)].memory;					\
  r##n = results + (n) * ISAAC_SIZE;				\
  a##n = ctx[(n)].a;						\
  b##n = ctx[(n)].b;						\
  c##n = ctx[(n)].c;						\
  b##n += ++c##n;						\
  mend##n = m2##n = mm##n + ARRAY_LEN (ctx[(n)].memory) / 2;	\
  m##n = mm##n;							\
} while (0)

  _(0);
  _(1);

#undef _

  while (m0 < mend0)
    {
      rngstep32 (a0 << 13, a0, b0, mm0, m0, m20, r0, x0, y0);
      rngstep32 (a1 << 13, a1, b1, mm1, m1, m21, r1, x1, y1);
      rngstep32 (a0 >> 6, a0, b0, mm0, m0, m20, r0, x0, y0);
      rngstep32 (a1 >> 6, a1, b1, mm1, m1, m21, r1, x1, y1);
      rngstep32 (a0 << 2, a0, b0, mm0, m0, m20, r0, x0, y0);
      rngstep32 (a1 << 2, a1, b1, mm1, m1, m21, r1, x1, y1);
      rngstep32 (a0 >> 16, a0, b0, mm0, m0, m20, r0, x0, y0);
      rngstep32 (a1 >> 16, a1, b1, mm1, m1, m21, r1, x1, y1);
    }

  m20 = mm0;
  m21 = mm1;
  while (m20 < mend0)
    {
      rngstep32 (a0 << 13, a0, b0, mm0, m0, m20, r0, x0, y0);
      rngstep32 (a1 << 13, a1, b1, mm1, m1, m21, r1, x1, y1);
      rngstep32 (a0 >> 6, a0, b0, mm0, m0, m20, r0, x0, y0);
      rngstep32 (a1 >> 6, a1, b1, mm1, m1, m21, r1, x1, y1);
      rngstep32 (a0 << 2, a0, b0, mm0, m0, m20, r0, x0, y0);
      rngstep32 (a1 << 2, a1, b1, mm1, m1, m21, r1, x1, y1);
      rngstep32 (a0 >> 16, a0, b0, mm0, m0, m20, r0, x0, y0);
      rngstep32 (a1 >> 16, a1, b1, mm1, m1, m21, r1, x1, y1);
    }

  ctx[0].a = a0;
  ctx[0].b = b0;
  ctx[0].c = c0;
  ctx[1].a = a1;
  ctx[1].b = b1;
  ctx[1].c = c1;
}

#define mix32(a,b,c,d,e,f,g,h)			\
{						\
   a^=b<<11; d+=a; b+=c;			\
   b^=c>>2;  e+=b; c+=d;			\
   c^=d<<8;  f+=c; d+=e;			\
   d^=e>>16; g+=d; e+=f;			\
   e^=f<<10; h+=e; f+=g;			\
   f^=g>>4;  a+=f; g+=h;			\
   g^=h<<8;  b+=g; h+=a;			\
   h^=a>>9;  c+=h; a+=b;			\
}

void
isaac_init (isaac_t * ctx, uword * seeds)
{
  word i;
  u32 a, b, c, d, e, f, g, h, *m, *r;

  ctx->a = ctx->b = ctx->c = 0;
  m = ctx->memory;
  r = seeds;

  a = b = c = d = e = f = g = h = 0x9e3779b9;	/* the golden ratio */

  for (i = 0; i < 4; ++i)	/* scramble it */
    mix32 (a, b, c, d, e, f, g, h);

  /* initialize using the contents of r[] as the seed */
  for (i = 0; i < ISAAC_SIZE; i += 8)
    {
      a += r[i];
      b += r[i + 1];
      c += r[i + 2];
      d += r[i + 3];
      e += r[i + 4];
      f += r[i + 5];
      g += r[i + 6];
      h += r[i + 7];
      mix32 (a, b, c, d, e, f, g, h);
      m[i] = a;
      m[i + 1] = b;
      m[i + 2] = c;
      m[i + 3] = d;
      m[i + 4] = e;
      m[i + 5] = f;
      m[i + 6] = g;
      m[i + 7] = h;
    }

  /* do a second pass to make all of the seed affect all of m */
  for (i = 0; i < ISAAC_SIZE; i += 8)
    {
      a += m[i];
      b += m[i + 1];
      c += m[i + 2];
      d += m[i + 3];
      e += m[i + 4];
      f += m[i + 5];
      g += m[i + 6];
      h += m[i + 7];
      mix32 (a, b, c, d, e, f, g, h);
      m[i] = a;
      m[i + 1] = b;
      m[i + 2] = c;
      m[i + 3] = d;
      m[i + 4] = e;
      m[i + 5] = f;
      m[i + 6] = g;
      m[i + 7] = h;
    }
}
#endif /* uword_bits == 32 */

#if uword_bits == 64

#define ind64(mm,x)  (*(u64 *)((u8 *)(mm) + ((x) & ((ISAAC_SIZE-1)<<3))))
#define rngstep64(mix,a,b,mm,m,m2,r,x,y)		\
{							\
  x = *m;						\
  a = (mix) + *(m2++);					\
  *(m++) = y = ind64(mm,x) + a + b;			\
  *(r++) = b = ind64(mm,y>>ISAAC_LOG2_SIZE) + x;	\
}

void
isaac (isaac_t * ctx, uword * results)
{
  u64 a, b, c, x, y, *m, *mm, *m2, *r, *mend;

  mm = ctx->memory;
  r = results;
  a = ctx->a;
  b = ctx->b;
  c = ctx->c;

  b += ++c;
  mend = m2 = mm + ARRAY_LEN (ctx->memory) / 2;
  m = mm;
  while (m < mend)
    {
      rngstep64 (~(a ^ (a << 21)), a, b, mm, m, m2, r, x, y);
      rngstep64 (a ^ (a >> 5), a, b, mm, m, m2, r, x, y);
      rngstep64 (a ^ (a << 12), a, b, mm, m, m2, r, x, y);
      rngstep64 (a ^ (a >> 33), a, b, mm, m, m2, r, x, y);
    }

  m2 = mm;
  while (m2 < mend)
    {
      rngstep64 (~(a ^ (a << 21)), a, b, mm, m, m2, r, x, y);
      rngstep64 (a ^ (a >> 5), a, b, mm, m, m2, r, x, y);
      rngstep64 (a ^ (a << 12), a, b, mm, m, m2, r, x, y);
      rngstep64 (a ^ (a >> 33), a, b, mm, m, m2, r, x, y);
    }

  ctx->a = a;
  ctx->b = b;
  ctx->c = c;
}

/* Perform 2 isaac runs with different contexts simultaneously. */
void
isaac2 (isaac_t * ctx, uword * results)
{
#define _(n) \
  u64 a##n, b##n, c##n, x##n, y##n, * m##n, * mm##n, * m2##n, * r##n, * mend##n

  _(0);
  _(1);

#undef _

#define _(n)							\
do {								\
  mm##n = ctx[(n)].memory;					\
  r##n = results + (n) * ISAAC_SIZE;				\
  a##n = ctx[(n)].a;						\
  b##n = ctx[(n)].b;						\
  c##n = ctx[(n)].c;						\
  b##n += ++c##n;						\
  mend##n = m2##n = mm##n + ARRAY_LEN (ctx[(n)].memory) / 2;	\
  m##n = mm##n;							\
} while (0)

  _(0);
  _(1);

#undef _

  (void) mend1;			/* compiler warning */

  while (m0 < mend0)
    {
      rngstep64 (~(a0 ^ (a0 << 21)), a0, b0, mm0, m0, m20, r0, x0, y0);
      rngstep64 (~(a1 ^ (a1 << 21)), a1, b1, mm1, m1, m21, r1, x1, y1);
      rngstep64 (a0 ^ (a0 >> 5), a0, b0, mm0, m0, m20, r0, x0, y0);
      rngstep64 (a1 ^ (a1 >> 5), a1, b1, mm1, m1, m21, r1, x1, y1);
      rngstep64 (a0 ^ (a0 << 12), a0, b0, mm0, m0, m20, r0, x0, y0);
      rngstep64 (a1 ^ (a1 << 12), a1, b1, mm1, m1, m21, r1, x1, y1);
      rngstep64 (a0 ^ (a0 >> 33), a0, b0, mm0, m0, m20, r0, x0, y0);
      rngstep64 (a1 ^ (a1 >> 33), a1, b1, mm1, m1, m21, r1, x1, y1);
    }

  m20 = mm0;
  m21 = mm1;
  while (m20 < mend0)
    {
      rngstep64 (~(a0 ^ (a0 << 21)), a0, b0, mm0, m0, m20, r0, x0, y0);
      rngstep64 (~(a1 ^ (a1 << 21)), a1, b1, mm1, m1, m21, r1, x1, y1);
      rngstep64 (a0 ^ (a0 >> 5), a0, b0, mm0, m0, m20, r0, x0, y0);
      rngstep64 (a1 ^ (a1 >> 5), a1, b1, mm1, m1, m21, r1, x1, y1);
      rngstep64 (a0 ^ (a0 << 12), a0, b0, mm0, m0, m20, r0, x0, y0);
      rngstep64 (a1 ^ (a1 << 12), a1, b1, mm1, m1, m21, r1, x1, y1);
      rngstep64 (a0 ^ (a0 >> 33), a0, b0, mm0, m0, m20, r0, x0, y0);
      rngstep64 (a1 ^ (a1 >> 33), a1, b1, mm1, m1, m21, r1, x1, y1);
    }

  ctx[0].a = a0;
  ctx[0].b = b0;
  ctx[0].c = c0;
  ctx[1].a = a1;
  ctx[1].b = b1;
  ctx[1].c = c1;
}

#define mix64(a,b,c,d,e,f,g,h)			\
{						\
   a-=e; f^=h>>9;  h+=a;			\
   b-=f; g^=a<<9;  a+=b;			\
   c-=g; h^=b>>23; b+=c;			\
   d-=h; a^=c<<15; c+=d;			\
   e-=a; b^=d>>14; d+=e;			\
   f-=b; c^=e<<20; e+=f;			\
   g-=c; d^=f>>17; f+=g;			\
   h-=d; e^=g<<14; g+=h;			\
}

void
isaac_init (isaac_t * ctx, uword * seeds)
{
  word i;
  u64 a, b, c, d, e, f, g, h, *m, *r;

  ctx->a = ctx->b = ctx->c = 0;
  m = ctx->memory;
  r = seeds;

  a = b = c = d = e = f = g = h = 0x9e3779b97f4a7c13LL;	/* the golden ratio */

  for (i = 0; i < 4; ++i)	/* scramble it */
    mix64 (a, b, c, d, e, f, g, h);

  for (i = 0; i < ISAAC_SIZE; i += 8)	/* fill in mm[] with messy stuff */
    {
      a += r[i];
      b += r[i + 1];
      c += r[i + 2];
      d += r[i + 3];
      e += r[i + 4];
      f += r[i + 5];
      g += r[i + 6];
      h += r[i + 7];
      mix64 (a, b, c, d, e, f, g, h);
      m[i] = a;
      m[i + 1] = b;
      m[i + 2] = c;
      m[i + 3] = d;
      m[i + 4] = e;
      m[i + 5] = f;
      m[i + 6] = g;
      m[i + 7] = h;
    }

  /* do a second pass to make all of the seed affect all of mm */
  for (i = 0; i < ISAAC_SIZE; i += 8)
    {
      a += m[i];
      b += m[i + 1];
      c += m[i + 2];
      d += m[i + 3];
      e += m[i + 4];
      f += m[i + 5];
      g += m[i + 6];
      h += m[i + 7];
      mix64 (a, b, c, d, e, f, g, h);
      m[i] = a;
      m[i + 1] = b;
      m[i + 2] = c;
      m[i + 3] = d;
      m[i + 4] = e;
      m[i + 5] = f;
      m[i + 6] = g;
      m[i + 7] = h;
    }
}
#endif /* uword_bits == 64 */


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