[glib/wip/kdbus-junk: 3/37] [kdbus] Add SipHash algorithm

[Ryan Lortie <desrt src gnome org>]

commit 898ee827d9b491839d4b1307f091eeea0477690a
Author: Lukasz Skalski <l skalski samsung com>
Date:   Fri Aug 22 14:49:29 2014 +0200

    [kdbus] Add SipHash algorithm
    
    Change-Id: I83f28c2249efd6dc8cf78e0383916c46d71df075

 glib/Makefile.am |    2 +
 glib/glib.h      |    1 +
 glib/gsiphash.c  |  137 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 glib/gsiphash.h  |   40 ++++++++++++++++
 4 files changed, 180 insertions(+), 0 deletions(-)
---
diff --git a/glib/Makefile.am b/glib/Makefile.am
index 6b8e629..0b7c8d8 100644
--- a/glib/Makefile.am
+++ b/glib/Makefile.am
@@ -159,6 +159,7 @@ libglib_2_0_la_SOURCES =    \
        gscripttable.h          \
        gsequence.c             \
        gshell.c                \
+       gsiphash.c              \
        gslice.c                \
        gslist.c                \
        gstdio.c                \
@@ -291,6 +292,7 @@ glibsubinclude_HEADERS = \
        gscanner.h      \
        gsequence.h     \
        gshell.h        \
+       gsiphash.h      \
        gslice.h        \
        gslist.h        \
        gspawn.h        \
diff --git a/glib/glib.h b/glib/glib.h
index c7fc999..e83caa6 100644
--- a/glib/glib.h
+++ b/glib/glib.h
@@ -73,6 +73,7 @@
 #include <glib/gscanner.h>
 #include <glib/gsequence.h>
 #include <glib/gshell.h>
+#include <glib/gsiphash.h>
 #include <glib/gslice.h>
 #include <glib/gslist.h>
 #include <glib/gspawn.h>
diff --git a/glib/gsiphash.c b/glib/gsiphash.c
new file mode 100644
index 0000000..6cda0dd
--- /dev/null
+++ b/glib/gsiphash.c
@@ -0,0 +1,137 @@
+/*
+   SipHash reference C implementation
+
+   Written in 2012 by
+   Jean-Philippe Aumasson <jeanphilippe aumasson gmail com>
+   Daniel J. Bernstein <djb cr yp to>
+
+   To the extent possible under law, the author(s) have dedicated all copyright
+   and related and neighboring rights to this software to the public domain
+   worldwide. This software is distributed without any warranty.
+
+   You should have received a copy of the CC0 Public Domain Dedication along with
+   this software. If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
+
+*/
+
+#include "config.h"
+
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "gsiphash.h"
+
+typedef uint64_t u64;
+typedef uint32_t u32;
+typedef uint8_t u8;
+
+#define ROTL(x,b) (u64)( ((x) << (b)) | ( (x) >> (64 - (b))) )
+
+#define U32TO8_LE(p, v)         \
+    (p)[0] = (u8)((v)      ); (p)[1] = (u8)((v) >>  8); \
+    (p)[2] = (u8)((v) >> 16); (p)[3] = (u8)((v) >> 24);
+
+#define U64TO8_LE(p, v)         \
+  U32TO8_LE((p),     (u32)((v)      ));   \
+  U32TO8_LE((p) + 4, (u32)((v) >> 32));
+
+#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            \
+  do {              \
+    v0 += v1; v1=ROTL(v1,13); v1 ^= v0; v0=ROTL(v0,32); \
+    v2 += v3; v3=ROTL(v3,16); v3 ^= v2;     \
+    v0 += v3; v3=ROTL(v3,21); v3 ^= v0;     \
+    v2 += v1; v1=ROTL(v1,17); v1 ^= v2; v2=ROTL(v2,32); \
+  } while(0)
+
+/* SipHash-2-4 */
+void g_siphash24(guint8 out[8], const void *_in, gsize inlen, const guint8 k[16])
+{
+  /* "somepseudorandomlygeneratedbytes" */
+  u64 v0 = 0x736f6d6570736575ULL;
+  u64 v1 = 0x646f72616e646f6dULL;
+  u64 v2 = 0x6c7967656e657261ULL;
+  u64 v3 = 0x7465646279746573ULL;
+  u64 b;
+  u64 k0 = U8TO64_LE( k );
+  u64 k1 = U8TO64_LE( k + 8 );
+  u64 m;
+  const u8 *in = _in;
+  const u8 *end = in + inlen - ( inlen % sizeof( u64 ) );
+  const int left = inlen & 7;
+  b = ( ( u64 )inlen ) << 56;
+  v3 ^= k1;
+  v2 ^= k0;
+  v1 ^= k1;
+  v0 ^= k0;
+
+  for ( ; in != end; in += 8 )
+  {
+    m = U8TO64_LE( in );
+#ifdef DEBUG
+    printf( "(%3d) v0 %08x %08x\n", ( int )inlen, ( u32 )( v0 >> 32 ), ( u32 )v0 );
+    printf( "(%3d) v1 %08x %08x\n", ( int )inlen, ( u32 )( v1 >> 32 ), ( u32 )v1 );
+    printf( "(%3d) v2 %08x %08x\n", ( int )inlen, ( u32 )( v2 >> 32 ), ( u32 )v2 );
+    printf( "(%3d) v3 %08x %08x\n", ( int )inlen, ( u32 )( v3 >> 32 ), ( u32 )v3 );
+    printf( "(%3d) compress %08x %08x\n", ( int )inlen, ( u32 )( m >> 32 ), ( u32 )m );
+#endif
+    v3 ^= m;
+    SIPROUND;
+    SIPROUND;
+    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;
+  }
+
+#ifdef DEBUG
+  printf( "(%3d) v0 %08x %08x\n", ( int )inlen, ( u32 )( v0 >> 32 ), ( u32 )v0 );
+  printf( "(%3d) v1 %08x %08x\n", ( int )inlen, ( u32 )( v1 >> 32 ), ( u32 )v1 );
+  printf( "(%3d) v2 %08x %08x\n", ( int )inlen, ( u32 )( v2 >> 32 ), ( u32 )v2 );
+  printf( "(%3d) v3 %08x %08x\n", ( int )inlen, ( u32 )( v3 >> 32 ), ( u32 )v3 );
+  printf( "(%3d) padding   %08x %08x\n", ( int )inlen, ( u32 )( b >> 32 ), ( u32 )b );
+#endif
+  v3 ^= b;
+  SIPROUND;
+  SIPROUND;
+  v0 ^= b;
+#ifdef DEBUG
+  printf( "(%3d) v0 %08x %08x\n", ( int )inlen, ( u32 )( v0 >> 32 ), ( u32 )v0 );
+  printf( "(%3d) v1 %08x %08x\n", ( int )inlen, ( u32 )( v1 >> 32 ), ( u32 )v1 );
+  printf( "(%3d) v2 %08x %08x\n", ( int )inlen, ( u32 )( v2 >> 32 ), ( u32 )v2 );
+  printf( "(%3d) v3 %08x %08x\n", ( int )inlen, ( u32 )( v3 >> 32 ), ( u32 )v3 );
+#endif
+  v2 ^= 0xff;
+  SIPROUND;
+  SIPROUND;
+  SIPROUND;
+  SIPROUND;
+  b = v0 ^ v1 ^ v2  ^ v3;
+  U64TO8_LE( out, b );
+}
diff --git a/glib/gsiphash.h b/glib/gsiphash.h
new file mode 100644
index 0000000..6040c75
--- /dev/null
+++ b/glib/gsiphash.h
@@ -0,0 +1,40 @@
+/*
+ *  Copyright (C) 2014 Samsung Electronics
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+
+ * Author: Lukasz Skalski       <l skalski samsung com>
+ */
+
+#ifndef __G_SIPHASH_H__
+#define __G_SIPHASH_H__
+
+#if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
+#error "Only <glib.h> can be included directly."
+#endif
+
+#include <glib/gtypes.h>
+
+G_BEGIN_DECLS
+
+GLIB_AVAILABLE_IN_ALL
+void    g_siphash24             (guint8         out[8],
+                                 const void    *_in,
+                                 gsize          inlen,
+                                 const guint8   k[16]);
+G_END_DECLS
+
+#endif /* __G_SIPHASH_H__ */