win32: allow use of shell's PRNG for /dev/urandom

Allow either ISAAC or the shell's built-in pseudo-random number
generator to be used for /dev/urandom.  The latter is smaller so
it's the default.

1 files changed, 33 insertions, 12 deletions

diff --git a/Config.in b/Config.in
index dc3a6e09a..a18d26720 100644
--- a/Config.in
+++ b/Config.in
@@ -122,18 +122,6 @@ config LFS
         programs that can benefit from large file support include dd, gzip,
         cp, mount, tar.
 
-config GLOBBING
-        bool "Allow busybox.exe to expand wildcards"
-        default n
-        depends on PLATFORM_MINGW32
-        help
-          In Microsoft Windows expansion of wildcards on the command line
-          ('globbing') is handled by the C runtime while the BusyBox shell
-          does its own wildcard expansion.  For best results when using the
-          shell globbing by the C runtime should be turned off. If you want
-          the BusyBox binary to handle wildcard expansion using the C runtime
-          set this to 'Y'.
-
 config PAM
         bool "Support PAM (Pluggable Authentication Modules)"
         default n
@@ -380,6 +368,39 @@ config PLATFORM_LINUX
         #This is automatically selected if any applet or feature requires
         #Linux-specific interfaces. You do not need to select it manually.
 
+config GLOBBING
+        bool "Allow busybox.exe to expand wildcards"
+        default n
+        depends on PLATFORM_MINGW32
+        help
+          In Microsoft Windows expansion of wildcards on the command line
+          ('globbing') is handled by the C runtime while the BusyBox shell
+          does its own wildcard expansion.  For best results when using the
+          shell globbing by the C runtime should be turned off. If you want
+          the BusyBox binary to handle wildcard expansion using the C runtime
+          set this to 'Y'.
+
+choice
+        prompt "Random number generator"
+        default FEATURE_PRNG_SHELL
+        depends on PLATFORM_MINGW32
+        help
+        BusyBox on Microsoft Windows uses a pseudo-random number
+        generator to emulate the Linux /dev/urandom device.  There
+        are two options:
+        - The shell's built-in PRNG.
+        - Bob Jenkins' ISAAC.  This is intended to be a secure PRNG.  It's
+        slightly faster than the shell's PRNG but is larger both in terms
+        of code and runtime memory.
+
+config FEATURE_PRNG_SHELL
+        bool "Use shell PRNG"
+
+config FEATURE_PRNG_ISAAC
+        bool "Use ISAAC PRNG"
+
+endchoice
+
 comment 'Build Options'
 
 config STATIC