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Call math.randomseed() without arguments to seed from system entropy.

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Reminder: the math.random() PRNG is NOT SUITABLE FOR CRYPTOGRAPHIC USE.
This commit is contained in:
Mike Pall 2024-07-04 01:26:29 +02:00
parent 7421a1b33c
commit 04dca7911e
4 changed files with 13 additions and 3 deletions
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6
doc/extensions.html
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@ -265,7 +265,7 @@ and let the GC do its work.
LuaJIT uses a Tausworthe PRNG with period 2^223 to implement
<tt>math.random()</tt> and <tt>math.randomseed()</tt>. The quality of
the PRNG results is much superior compared to the standard Lua
implementation, which uses the platform-specific ANSI rand().
implementation, which uses the platform-specific ANSI <tt>rand()</tt>.
</p>
<p>
The PRNG generates the same sequences from the same seeds on all
@ -276,6 +276,10 @@ It's correctly scaled up and rounded for <tt>math.random(n&nbsp;[,m])</tt> to
preserve uniformity.
</p>
<p>
Call <tt>math.randomseed()</tt> without any arguments to seed it from
system entropy.
</p>
<p>
Important: Neither this nor any other PRNG based on the simplistic
<tt>math.random()</tt> API is suitable for cryptographic use.
</p>

3
src/Makefile.dep
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@ -32,7 +32,8 @@ lib_jit.o: lib_jit.c lua.h luaconf.h lauxlib.h lualib.h lj_obj.h lj_def.h \
lj_target.h lj_target_*.h lj_trace.h lj_dispatch.h lj_traceerr.h \
lj_vm.h lj_vmevent.h lj_lib.h luajit.h lj_libdef.h
lib_math.o: lib_math.c lua.h luaconf.h lauxlib.h lualib.h lj_obj.h \
lj_def.h lj_arch.h lj_lib.h lj_vm.h lj_prng.h lj_libdef.h
lj_def.h lj_arch.h lj_err.h lj_errmsg.h lj_lib.h lj_vm.h lj_prng.h \
lj_libdef.h
lib_os.o: lib_os.c lua.h luaconf.h lauxlib.h lualib.h lj_obj.h lj_def.h \
lj_arch.h lj_gc.h lj_err.h lj_errmsg.h lj_buf.h lj_str.h lj_lib.h \
lj_libdef.h

4
src/lib_math.c
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@ -13,6 +13,7 @@
#include "lualib.h"
#include "lj_obj.h"
#include "lj_err.h"
#include "lj_lib.h"
#include "lj_vm.h"
#include "lj_prng.h"
@ -183,7 +184,10 @@ LJLIB_PUSH(top-2) /* Upvalue holds userdata with PRNGState. */
LJLIB_CF(math_randomseed)
{
PRNGState *rs = (PRNGState *)(uddata(udataV(lj_lib_upvalue(L, 1))));
if (L->base != L->top)
random_seed(rs, lj_lib_checknum(L, 1));
else if (!lj_prng_seed_secure(rs))
lj_err_caller(L, LJ_ERR_PRNGSD);
return 0;
}

1
src/lj_errmsg.h
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@ -79,6 +79,7 @@ ERRDEF(SETFENV, LUA_QL("setfenv") " cannot change environment of given object")
ERRDEF(CORUN, "cannot resume running coroutine")
ERRDEF(CODEAD, "cannot resume dead coroutine")
ERRDEF(COSUSP, "cannot resume non-suspended coroutine")
ERRDEF(PRNGSD, "PRNG seeding failed")
ERRDEF(TABINS, "wrong number of arguments to " LUA_QL("insert"))
ERRDEF(TABCAT, "invalid value (%s) at index %d in table for " LUA_QL("concat"))
ERRDEF(TABSORT, "invalid order function for sorting")