From 51407f1797c77c742815d3135632666f4d940cb7 Mon Sep 17 00:00:00 2001
From: David Phillips <david@sighup.nz>
Date: Sat, 18 Nov 2017 13:43:28 +1300
Subject: Switch to in-house byte-order switching

---
 Makefile    |  2 ++
 endian.h    | 13 +++++++++++++
 sand-leek.c |  4 ++--
 3 files changed, 17 insertions(+), 2 deletions(-)
 create mode 100644 endian.h

diff --git a/Makefile b/Makefile
index 144a423..adf947e 100644
--- a/Makefile
+++ b/Makefile
@@ -3,6 +3,8 @@ LDFLAGS += -lssl -lcrypto -lpthread
 
 all: sand-leek
 
+sand-leek.o: endian.h onion_base32.h key_update.h
+
 sand-leek: sand-leek.o onion_base32.o key_update.o
 	$(CC) -o $@ $^ $(LDFLAGS)
 
diff --git a/endian.h b/endian.h
new file mode 100644
index 0000000..6ebda83
--- /dev/null
+++ b/endian.h
@@ -0,0 +1,13 @@
+#ifndef SAND_LEEK_ENDIAN_H
+#define SAND_LEEK_ENDIAN_H
+
+#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+# define sl_htobe32(x) (x)
+#else
+# define sl_htobe32(x) (((x & 0x000000FF) << 24) | \
+                       ((x & 0xFF000000) >> 24)) | \
+                       ((x & 0x0000FF00) << 8) | \
+                       ((x & 0x00FF0000) >> 8)
+#endif
+
+#endif /* ifndef SAND_LEEK_ENDIAN_H */
diff --git a/sand-leek.c b/sand-leek.c
index 7c5ea29..97b9b1d 100644
--- a/sand-leek.c
+++ b/sand-leek.c
@@ -6,12 +6,12 @@
 #include <semaphore.h>
 #include <errno.h>
 #include <string.h>
-#include <endian.h>
 #include <openssl/rsa.h>
 #include <openssl/sha.h>
 #include <openssl/pem.h>
 #include <openssl/err.h>
 
+#include "endian.h"
 #include "onion_base32.h"
 #include "key_update.h"
 
@@ -91,7 +91,7 @@ work(void *arg) {
 		while (e < EXPONENT_MAX) {
 			memcpy(&working_sha_c, &sha_c, sizeof(SHA_CTX));
 
-			e_big_endian = htobe32(e);
+			e_big_endian = sl_htobe32(e);
 			SHA1_Update(&working_sha_c, &e_big_endian, EXPONENT_SIZE_BYTES);
 			SHA1_Final((unsigned char*)&sha, &working_sha_c);
 
-- 
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