From e5888a1ffdae813d7575f5fb02275c6bb07e5199 Mon Sep 17 00:00:00 2001
From: Taru Karttunen <taruti@taruti.net>
Date: Wed, 30 Mar 2011 15:46:40 +0300
Subject: Import sources from 2011-03-30 iso image

---
 sys/src/cmd/sha1sum.c | 107 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 107 insertions(+)
 create mode 100755 sys/src/cmd/sha1sum.c

(limited to 'sys/src/cmd/sha1sum.c')

diff --git a/sys/src/cmd/sha1sum.c b/sys/src/cmd/sha1sum.c
new file mode 100755
index 000000000..321a3ba1f
--- /dev/null
+++ b/sys/src/cmd/sha1sum.c
@@ -0,0 +1,107 @@
+/*
+ * sha1sum - compute SHA1 or SHA2 digest
+ */
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include <libsec.h>
+
+#pragma	varargck	type	"M"	uchar*
+
+typedef struct Sha2 Sha2;
+struct Sha2 {
+	int	bits;
+	int	dlen;
+	DigestState* (*func)(uchar *, ulong, uchar *, DigestState *);
+};
+
+static Sha2 sha2s[] = {
+	224,	SHA2_224dlen,	sha2_224,
+	256,	SHA2_256dlen,	sha2_256,
+	384,	SHA2_384dlen,	sha2_384,
+	512,	SHA2_512dlen,	sha2_512,
+};
+
+static DigestState* (*shafunc)(uchar *, ulong, uchar *, DigestState *);
+static int shadlen;
+
+static int
+digestfmt(Fmt *fmt)
+{
+	char buf[SHA2_512dlen*2 + 1];
+	uchar *p;
+	int i;
+
+	p = va_arg(fmt->args, uchar*);
+	for(i = 0; i < shadlen; 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[SHA2_512dlen];
+	DigestState *s;
+
+	s = (*shafunc)(nil, 0, nil, nil);
+	while((n = read(fd, buf, sizeof buf)) > 0)
+		(*shafunc)(buf, n, nil, s);
+	if(n < 0){
+		fprint(2, "reading %s: %r\n", name? name: "stdin");
+		return;
+	}
+	(*shafunc)(nil, 0, digest, s);
+	if(name == nil)
+		print("%M\n", digest);
+	else
+		print("%M\t%s\n", digest, name);
+}
+
+static void
+usage(void)
+{
+	fprint(2, "usage: %s [-2 bits] [file...]\n", argv0);
+	exits("usage");
+}
+
+void
+main(int argc, char *argv[])
+{
+	int i, fd, bits;
+	Sha2 *sha;
+
+	shafunc = sha1;
+	shadlen = SHA1dlen;
+	ARGBEGIN{
+	case '2':
+		bits = atoi(EARGF(usage()));
+		for (sha = sha2s; sha < sha2s + nelem(sha2s); sha++)
+			if (sha->bits == bits)
+				break;
+		if (sha >= sha2s + nelem(sha2s))
+			sysfatal("unknown number of sha2 bits: %d", bits);
+		shafunc = sha->func;
+		shadlen = sha->dlen;
+		break;
+	default:
+		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, "%s: can't open %s: %r\n", argv0, argv[i]);
+				continue;
+			}
+			sum(fd, argv[i]);
+			close(fd);
+		}
+	exits(nil);
+}
-- 
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