1 files changed, 61 insertions, 0 deletions
diff --git a/src/cmd/sha1sum.c b/src/cmd/sha1sum.c
new file mode 100644
index 00000000..d8c449fa
--- /dev/null
+++ b/src/cmd/sha1sum.c
@@ -0,0 +1,61 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include <libsec.h>
+
+static int
+digestfmt(Fmt *fmt)
+{
+	char buf[SHA1dlen*2+1];
+	uchar *p;
+	int i;
+
+	p = va_arg(fmt->args, uchar*);
+	for(i=0; i<SHA1dlen; i++)
+		sprint(buf+2*i, "%.2ux", p[i]);
+	return fmtstrcpy(fmt, buf);
+}
+
+static void
+sum(int fd, char *name)
+{
+	int n;
+	uchar buf[8192], digest[SHA1dlen];
+	DigestState *s;
+
+	s = sha1(nil, 0, nil, nil);
+	while((n = read(fd, buf, sizeof buf)) > 0)
+		sha1(buf, n, nil, s);
+	sha1(nil, 0, digest, s);
+	if(name == nil)
+		print("%M\n", digest);
+	else
+		print("%M\t%s\n", digest, name);
+}
+
+void
+main(int argc, char *argv[])
+{
+	int i, fd;
+
+	ARGBEGIN{
+	default:
+		fprint(2, "usage: sha1sum [file...]\n");
+		exits("usage");
+	}ARGEND
+
+	fmtinstall('M', digestfmt);
+
+	if(argc == 0)
+		sum(0, nil);
+	else for(i = 0; i < argc; i++){
+		fd = open(argv[i], OREAD);
+		if(fd < 0){
+			fprint(2, "sha1sum: can't open %s: %r\n", argv[i]);
+			continue;
+		}
+		sum(fd, argv[i]);
+		close(fd);
+	}
+	exits(nil);
+}