Figure out endianness at compile-time, using _BYTE_ORDER from

<machine/endian.h>, rather than writing 1 to a 32-bit variable and checking
whether the first byte is nonzero.

tweaks and ok matthew@; ok beck@ tedu@

1 files changed, 2 insertions, 3 deletions

diff --git a/src/lib/libcrypto/modes/xts128.c b/src/lib/libcrypto/modes/xts128.c
index 9cf27a25e9..de23de457d 100644
--- a/src/lib/libcrypto/modes/xts128.c
+++ b/src/lib/libcrypto/modes/xts128.c
@@ -62,7 +62,6 @@ int CRYPTO_xts128_encrypt(const XTS128_CONTEXT *ctx, const unsigned char iv[16],
         const unsigned char *inp, unsigned char *out,
         size_t len, int enc)
 {
-        const union { long one; char little; } is_endian = {1};
         union { u64 u[2]; u32 d[4]; u8 c[16]; } tweak, scratch;
         unsigned int i;
 
@@ -98,7 +97,7 @@ int CRYPTO_xts128_encrypt(const XTS128_CONTEXT *ctx, const unsigned char iv[16],
 
                 if (len==0)     return 0;
 
-                if (is_endian.little) {
+                if (_BYTE_ORDER == _LITTLE_ENDIAN) {
                         unsigned int carry,res;
                         
                         res = 0x87&(((int)tweak.d[3])>>31);
@@ -134,7 +133,7 @@ int CRYPTO_xts128_encrypt(const XTS128_CONTEXT *ctx, const unsigned char iv[16],
         else {
                 union { u64 u[2]; u8 c[16]; } tweak1;
 
-                if (is_endian.little) {
+                if (_BYTE_ORDER == _LITTLE_ENDIAN) {
                         unsigned int carry,res;
 
                         res = 0x87&(((int)tweak.d[3])>>31);