From 50b37d4a27d3295a29afca2286f1a5a086142cec Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 28 Apr 2024 11:49:46 +0200
Subject: Adding upstream version 3.2.1+dfsg.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/lib/isaac.c | 133 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 133 insertions(+)
 create mode 100644 src/lib/isaac.c

(limited to 'src/lib/isaac.c')

diff --git a/src/lib/isaac.c b/src/lib/isaac.c
new file mode 100644
index 0000000..fff1a35
--- /dev/null
+++ b/src/lib/isaac.c
@@ -0,0 +1,133 @@
+/*
+------------------------------------------------------------------------------
+http://burtleburtle.net/bob/rand/isaac.html
+rand.c: By Bob Jenkins.  My random number generator, ISAAC.  Public Domain
+MODIFIED:
+  960327: Creation (addition of randinit, really)
+  970719: use context, not global variables, for internal state
+  980324: make a portable version
+  010626: Note this is public domain
+------------------------------------------------------------------------------
+*/
+
+RCSID("$Id$")
+
+#include <freeradius-devel/libradius.h>
+
+#define RANDSIZL   (8)  /* I recommend 8 for crypto, 4 for simulations */
+#define RANDSIZ    (1<<RANDSIZL)
+
+#define ind(mm,x)  ((mm)[(x>>2)&(RANDSIZ-1)])
+#define rngstep(mix,a,b,mm,m,m2,r,x) \
+{ \
+  x = *m;  \
+  a = ((a^(mix)) + *(m2++)) & 0xffffffff; \
+  *(m++) = y = (ind(mm,x) + a + b) & 0xffffffff; \
+  *(r++) = b = (ind(mm,y>>RANDSIZL) + x) & 0xffffffff; \
+}
+
+void fr_isaac(fr_randctx *ctx)
+{
+   register uint32_t a,b,x,y,*m,*mm,*m2,*r,*mend;
+   mm=ctx->randmem; r=ctx->randrsl;
+   a = ctx->randa; b = (ctx->randb + (++ctx->randc)) & 0xffffffff;
+   for (m = mm, mend = m2 = m+(RANDSIZ/2); m<mend; )
+   {
+      rngstep( a<<13, a, b, mm, m, m2, r, x);
+      rngstep( a>>6 , a, b, mm, m, m2, r, x);
+      rngstep( a<<2 , a, b, mm, m, m2, r, x);
+      rngstep( a>>16, a, b, mm, m, m2, r, x);
+   }
+   for (m2 = mm; m2<mend; )
+   {
+      rngstep( a<<13, a, b, mm, m, m2, r, x);
+      rngstep( a>>6 , a, b, mm, m, m2, r, x);
+      rngstep( a<<2 , a, b, mm, m, m2, r, x);
+      rngstep( a>>16, a, b, mm, m, m2, r, x);
+   }
+   ctx->randb = b; ctx->randa = a;
+}
+
+
+#define mix(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; \
+}
+
+/* if (flag==1), then use the contents of randrsl[] to initialize mm[]. */
+void fr_randinit(fr_randctx *ctx, int flag)
+{
+  int i;
+  uint32_t a,b,c,d,e,f,g,h;
+  uint32_t *m,*r;
+  ctx->randa = ctx->randb = ctx->randc = 0;
+  m=ctx->randmem;
+  r=ctx->randrsl;
+  a=b=c=d=e=f=g=h=0x9e3779b9;  /* the golden ratio */
+
+  for (i=0; i<4; ++i) {	/* scramble it */
+    mix(a,b,c,d,e,f,g,h);
+  }
+
+  if (flag) {
+    /* initialize using the contents of r[] as the seed */
+    for (i=0; i<RANDSIZ; 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];
+      mix(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<RANDSIZ; 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];
+      mix(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;
+    }
+  } else {
+    for (i=0; i<RANDSIZ; i+=8) {
+      /* fill in mm[] with messy stuff */
+      mix(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;
+    }
+  }
+
+  fr_isaac(ctx);       /* fill in the first set of results */
+  ctx->randcnt=RANDSIZ;  /* prepare to use the first set of results */
+}
+
+
+#ifdef TEST
+/*
+ *  For testing.  Output should be the same as
+ *
+ *  http://burtleburtle.net/bob/rand/randvect.txt
+ */
+int main()
+{
+  uint32_t i,j;
+  fr_randctx ctx;
+
+  ctx.randa = ctx.randb = ctx.randc = (uint32_t)0;
+
+  for (i=0; i<256; ++i) ctx.randrsl[i]=(uint32_t)0;
+  fr_randinit(&ctx, 1);
+  for (i=0; i<2; ++i) {
+    fr_isaac(&ctx);
+    for (j=0; j<256; ++j) {
+      printf("%.8lx",ctx.randrsl[j]);
+      if ((j&7)==7) printf("\n");
+    }
+  }
+}
+#endif
-- 
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