From b65bc21e7d8dc8cafc70dfa6354cb66b8874b2d9 Mon Sep 17 00:00:00 2001
From: Junio C Hamano <junkio@cox.net>
Date: Sat, 24 Jun 2006 00:59:49 -0700
Subject: [PATCH] Makefile: add framework to verify and bench sha1
 implementations.

Signed-off-by: Junio C Hamano <junkio@cox.net>
---
 Makefile     |  6 ++++
 test-sha1.c  | 24 +++++++++++++++
 test-sha1.sh | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 113 insertions(+)
 create mode 100644 test-sha1.c
 create mode 100755 test-sha1.sh

diff --git a/Makefile b/Makefile
index e29e3fa381..ea0044d623 100644
--- a/Makefile
+++ b/Makefile
@@ -636,6 +636,12 @@ test-delta$X: test-delta.c diff-delta.o patch-delta.o
 test-dump-cache-tree$X: dump-cache-tree.o $(GITLIBS)
 	$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS)
 
+test-sha1$X: test-sha1.o $(GITLIBS)
+	$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS)
+
+check-sha1:: test-sha1$X
+	./test-sha1.sh
+
 check:
 	for i in *.c; do sparse $(ALL_CFLAGS) $(SPARSE_FLAGS) $$i || exit; done
 
diff --git a/test-sha1.c b/test-sha1.c
new file mode 100644
index 0000000000..2efc315ee3
--- /dev/null
+++ b/test-sha1.c
@@ -0,0 +1,24 @@
+#include "cache.h"
+
+int main(int ac, char **av)
+{
+	SHA_CTX ctx;
+	unsigned char sha1[20];
+
+	SHA1_Init(&ctx);
+
+	while (1) {
+		ssize_t sz;
+		char buffer[8192];
+		sz = xread(0, buffer, sizeof(buffer));
+		if (sz == 0)
+			break;
+		if (sz < 0)
+			die("test-sha1: %s", strerror(errno));
+		SHA1_Update(&ctx, buffer, sz);
+	}
+	SHA1_Final(sha1, &ctx);
+	puts(sha1_to_hex(sha1));
+	exit(0);
+}
+
diff --git a/test-sha1.sh b/test-sha1.sh
new file mode 100755
index 0000000000..01bbb5782e
--- /dev/null
+++ b/test-sha1.sh
@@ -0,0 +1,83 @@
+#!/bin/sh
+
+dd if=/dev/zero bs=1048576 count=100 2>/dev/null |
+/usr/bin/time ./test-sha1 >/dev/null
+
+while read expect cnt pfx
+do
+	case "$expect" in '#'*) continue ;; esac
+	actual=`
+		{
+			test -z "$pfx" || echo "$pfx"
+			dd if=/dev/zero bs=1048576 count=$cnt 2>/dev/null |
+			tr '[\0]' '[g]'
+		} | ./test-sha1
+	`
+	if test "$expect" = "$actual"
+	then
+		echo "OK: $expect $cnt $pfx"
+	else
+		echo >&2 "OOPS: $cnt"
+		echo >&2 "expect: $expect"
+		echo >&2 "actual: $actual"
+		exit 1
+	fi
+done <<EOF
+da39a3ee5e6b4b0d3255bfef95601890afd80709 0
+3f786850e387550fdab836ed7e6dc881de23001b 0 a
+5277cbb45a15902137d332d97e89cf8136545485 0 ab
+03cfd743661f07975fa2f1220c5194cbaff48451 0 abc
+3330b4373640f9e4604991e73c7e86bfd8da2dc3 0 abcd
+ec11312386ad561674f724b8cca7cf1796e26d1d 0 abcde
+bdc37c074ec4ee6050d68bc133c6b912f36474df 0 abcdef
+69bca99b923859f2dc486b55b87f49689b7358c7 0 abcdefg
+e414af7161c9554089f4106d6f1797ef14a73666 0 abcdefgh
+0707f2970043f9f7c22029482db27733deaec029 0 abcdefghi
+a4dd8aa74a5636728fe52451636e2e17726033aa 1
+9986b45e2f4d7086372533bb6953a8652fa3644a 1 frotz
+23d8d4f788e8526b4877548a32577543cbaaf51f 10
+8cd23f822ab44c7f481b8c92d591f6d1fcad431c 10 frotz
+f3b5604a4e604899c1233edb3bf1cc0ede4d8c32 512
+b095bd837a371593048136e429e9ac4b476e1bb3 512 frotz
+08fa81d6190948de5ccca3966340cc48c10cceac 1200 xyzzy
+e33a291f42c30a159733dd98b8b3e4ff34158ca0 4090 4G
+#a3bf783bc20caa958f6cb24dd140a7b21984838d 9999 nitfol
+EOF
+
+exit
+
+# generating test vectors
+# inputs are number of megabytes followed by some random string to prefix.
+
+while read cnt pfx
+do
+	actual=`
+		{
+			test -z "$pfx" || echo "$pfx"
+			dd if=/dev/zero bs=1048576 count=$cnt 2>/dev/null |
+			tr '[\0]' '[g]'
+		} | sha1sum |
+		sed -e 's/ .*//'
+	`
+	echo "$actual $cnt $pfx"
+done <<EOF
+0
+0 a
+0 ab
+0 abc
+0 abcd
+0 abcde
+0 abcdef
+0 abcdefg
+0 abcdefgh
+0 abcdefghi
+1
+1 frotz
+10
+10 frotz
+512
+512 frotz
+1200 xyzzy
+4090 4G
+9999 nitfol
+EOF