1 files changed, 59 insertions, 0 deletions
diff --git a/src/cmd/auth/pemdecode.c b/src/cmd/auth/pemdecode.c
new file mode 100644
index 00000000..f6a6fd59
--- /dev/null
+++ b/src/cmd/auth/pemdecode.c
@@ -0,0 +1,59 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include <mp.h>
+#include <libsec.h>
+
+void
+usage(void)
+{
+	fprint(2, "auth/pemdecode section [file]\n");
+	exits("usage");
+}
+
+void
+main(int argc, char **argv)
+{
+	char *buf;
+	uchar *bin;
+	int fd;
+	long n, tot;
+	int len;
+	char *tag, *file;
+
+	ARGBEGIN{
+	default:
+		usage();
+	}ARGEND
+
+	if(argc != 1 && argc != 2)
+		usage();
+
+	tag = argv[0];
+	if(argc == 2)
+		file = argv[1];
+	else
+		file = "/dev/stdin";
+
+	if((fd = open(file, OREAD)) < 0)
+		sysfatal("open %s: %r", file);
+	buf = nil;
+	tot = 0;
+	for(;;){
+		buf = realloc(buf, tot+8192);
+		if(buf == nil)
+			sysfatal("realloc: %r");
+		if((n = read(fd, buf+tot, 8192)) < 0)
+			sysfatal("read: %r");
+		if(n == 0)
+			break;
+		tot += n;
+	}
+	buf[tot] = 0;
+	bin = decodepem(buf, tag, &len, nil);
+	if(bin == nil)
+		sysfatal("cannot extract section '%s' from pem", tag);
+	if((n=write(1, bin, len)) != len)
+		sysfatal("writing %d bytes got %ld: %r", len, n);
+	exits(0);
+}