20060303a

1 files changed, 50 insertions, 0 deletions

diff --git a/appl/lib/random.b b/appl/lib/random.b
new file mode 100644
index 00000000..16c7c1ef
--- /dev/null
+++ b/appl/lib/random.b
@@ -0,0 +1,50 @@
+implement Random;
+
+include "sys.m";
+include "draw.m";
+include "keyring.m";
+include "security.m";
+
+sys: Sys;
+
+randfd(which: int): ref sys->FD
+{
+	file: string;
+
+	sys = load Sys Sys->PATH;
+	case(which){
+	ReallyRandom =>
+		file = "/dev/random";
+	NotQuiteRandom =>
+		file = "/dev/notquiterandom";
+	}
+	fd := sys->open(file, sys->OREAD);
+	if(fd == nil){
+		sys->print("can't open /dev/random\n");
+		return nil;
+	}
+	return fd;
+}
+
+randomint(which: int): int
+{
+	fd := randfd(which);
+	if(fd == nil)
+		return 0;
+	buf := array[4] of byte;
+	sys->read(fd, buf, 4);
+	rand := 0;
+	for(i := 0; i < 4; i++)
+		rand = (rand<<8) | int buf[i];
+	return rand;
+}
+
+randombuf(which, n: int): array of byte
+{
+	buf := array[n] of byte;
+	fd := randfd(which);
+	if(fd == nil)
+		return buf;
+	sys->read(fd, buf, n);
+	return buf;
+}