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@

18 files changed, 104 insertions, 138 deletions

diff --git a/src/lib/libcrypto/evp/bio_ok.c b/src/lib/libcrypto/evp/bio_ok.c
index fdb742f554..09a762ffac 100644
--- a/src/lib/libcrypto/evp/bio_ok.c
+++ b/src/lib/libcrypto/evp/bio_ok.c
@@ -120,6 +120,7 @@
 #include <stdio.h>
 #include <errno.h>
 #include <assert.h>
+#include <machine/endian.h>
 #include "cryptlib.h"
 #include <openssl/buffer.h>
 #include <openssl/bio.h>
@@ -463,9 +464,8 @@ static long ok_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
         }
 
 static void longswap(void *_ptr, size_t len)
-{       const union { long one; char little; } is_endian = {1};
-
-        if (is_endian.little) {
+{
+        if (_BYTE_ORDER == _LITTLE_ENDIAN) {
                 size_t i;
                 unsigned char *p=_ptr,c;
 
diff --git a/src/lib/libcrypto/modes/ctr128.c b/src/lib/libcrypto/modes/ctr128.c
index ee642c5863..96af854f8a 100644
--- a/src/lib/libcrypto/modes/ctr128.c
+++ b/src/lib/libcrypto/modes/ctr128.c
@@ -77,11 +77,12 @@ static void ctr128_inc(unsigned char *counter) {
 }
 
 #if !defined(OPENSSL_SMALL_FOOTPRINT)
-static void ctr128_inc_aligned(unsigned char *counter) {
+static void
+ctr128_inc_aligned(unsigned char *counter)
+{
         size_t *data,c,n;
-        const union { long one; char little; } is_endian = {1};
 
-        if (is_endian.little) {
+        if (_BYTE_ORDER == _LITTLE_ENDIAN) {
                 ctr128_inc(counter);
                 return;
         }
diff --git a/src/lib/libcrypto/modes/gcm128.c b/src/lib/libcrypto/modes/gcm128.c
index a495db110f..92b7f4f3c8 100644
--- a/src/lib/libcrypto/modes/gcm128.c
+++ b/src/lib/libcrypto/modes/gcm128.c
@@ -147,7 +147,6 @@ static void gcm_gmult_8bit(u64 Xi[2], const u128 Htable[256])
         u128 Z = { 0, 0};
         const u8 *xi = (const u8 *)Xi+15;
         size_t rem, n = *xi;
-        const union { long one; char little; } is_endian = {1};
         static const size_t rem_8bit[256] = {
                 PACK(0x0000), PACK(0x01C2), PACK(0x0384), PACK(0x0246),
                 PACK(0x0708), PACK(0x06CA), PACK(0x048C), PACK(0x054E),
@@ -231,7 +230,7 @@ static void gcm_gmult_8bit(u64 Xi[2], const u128 Htable[256])
                         Z.hi ^= (u64)rem_8bit[rem]<<32;
         }
 
-        if (is_endian.little) {
+        if (_BYTE_ORDER == _LITTLE_ENDIAN) {
 #ifdef BSWAP8
                 Xi[0] = BSWAP8(Z.hi);
                 Xi[1] = BSWAP8(Z.lo);
@@ -307,9 +306,8 @@ static void gcm_init_4bit(u128 Htable[16], u64 H[2])
          */
         {
         int j;
-        const union { long one; char little; } is_endian = {1};
 
-        if (is_endian.little)
+        if (_BYTE_ORDER == _LITTLE_ENDIAN)
                 for (j=0;j<16;++j) {
                         V = Htable[j];
                         Htable[j].hi = V.lo;
@@ -337,7 +335,6 @@ static void gcm_gmult_4bit(u64 Xi[2], const u128 Htable[16])
         u128 Z;
         int cnt = 15;
         size_t rem, nlo, nhi;
-        const union { long one; char little; } is_endian = {1};
 
         nlo  = ((const u8 *)Xi)[15];
         nhi  = nlo>>4;
@@ -376,7 +373,7 @@ static void gcm_gmult_4bit(u64 Xi[2], const u128 Htable[16])
                 Z.lo ^= Htable[nlo].lo;
         }
 
-        if (is_endian.little) {
+        if (_BYTE_ORDER == _LITTLE_ENDIAN) {
 #ifdef BSWAP8
                 Xi[0] = BSWAP8(Z.hi);
                 Xi[1] = BSWAP8(Z.lo);
@@ -409,7 +406,6 @@ static void gcm_ghash_4bit(u64 Xi[2],const u128 Htable[16],
     u128 Z;
     int cnt;
     size_t rem, nlo, nhi;
-    const union { long one; char little; } is_endian = {1};
 
 #if 1
     do {
@@ -546,7 +542,7 @@ static void gcm_ghash_4bit(u64 Xi[2],const u128 Htable[16],
         Z.hi ^= ((u64)rem_8bit[rem<<4])<<48;
 #endif
 
-        if (is_endian.little) {
+        if (_BYTE_ORDER == _LITTLE_ENDIAN) {
 #ifdef BSWAP8
                 Xi[0] = BSWAP8(Z.hi);
                 Xi[1] = BSWAP8(Z.lo);
@@ -588,13 +584,12 @@ static void gcm_gmult_1bit(u64 Xi[2],const u64 H[2])
         long X;
         int  i,j;
         const long *xi = (const long *)Xi;
-        const union { long one; char little; } is_endian = {1};
 
         V.hi = H[0];    /* H is in host byte order, no byte swapping */
         V.lo = H[1];
 
         for (j=0; j<16/sizeof(long); ++j) {
-                if (is_endian.little) {
+                if (_BYTE_ORDER == _LITTLE_ENDIAN) {
                         if (sizeof(long)==8) {
 #ifdef BSWAP8
                                 X = (long)(BSWAP8(xi[j]));
@@ -620,7 +615,7 @@ static void gcm_gmult_1bit(u64 Xi[2],const u64 H[2])
                 }
         }
 
-        if (is_endian.little) {
+        if (_BYTE_ORDER == _LITTLE_ENDIAN) {
 #ifdef BSWAP8
                 Xi[0] = BSWAP8(Z.hi);
                 Xi[1] = BSWAP8(Z.lo);
@@ -685,15 +680,13 @@ void gcm_ghash_neon(u64 Xi[2],const u128 Htable[16],const u8 *inp,size_t len);
 
 void CRYPTO_gcm128_init(GCM128_CONTEXT *ctx,void *key,block128_f block)
 {
-        const union { long one; char little; } is_endian = {1};
-
         memset(ctx,0,sizeof(*ctx));
         ctx->block = block;
         ctx->key   = key;
 
         (*block)(ctx->H.c,ctx->H.c,key);
 
-        if (is_endian.little) {
+        if (_BYTE_ORDER == _LITTLE_ENDIAN) {
                 /* H is stored in host byte order */
 #ifdef BSWAP8
                 ctx->H.u[0] = BSWAP8(ctx->H.u[0]);
@@ -755,7 +748,6 @@ void CRYPTO_gcm128_init(GCM128_CONTEXT *ctx,void *key,block128_f block)
 
 void CRYPTO_gcm128_setiv(GCM128_CONTEXT *ctx,const unsigned char *iv,size_t len)
 {
-        const union { long one; char little; } is_endian = {1};
         unsigned int ctr;
 #ifdef GCM_FUNCREF_4BIT
         void (*gcm_gmult_p)(u64 Xi[2],const u128 Htable[16])    = ctx->gmult;
@@ -790,7 +782,7 @@ void CRYPTO_gcm128_setiv(GCM128_CONTEXT *ctx,const unsigned char *iv,size_t len)
                         GCM_MUL(ctx,Yi);
                 }
                 len0 <<= 3;
-                if (is_endian.little) {
+                if (_BYTE_ORDER == _LITTLE_ENDIAN) {
 #ifdef BSWAP8
                         ctx->Yi.u[1]  ^= BSWAP8(len0);
 #else
@@ -809,7 +801,7 @@ void CRYPTO_gcm128_setiv(GCM128_CONTEXT *ctx,const unsigned char *iv,size_t len)
 
                 GCM_MUL(ctx,Yi);
 
-                if (is_endian.little)
+                if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                         ctr = BSWAP4(ctx->Yi.d[3]);
 #else
@@ -821,7 +813,7 @@ void CRYPTO_gcm128_setiv(GCM128_CONTEXT *ctx,const unsigned char *iv,size_t len)
 
         (*ctx->block)(ctx->Yi.c,ctx->EK0.c,ctx->key);
         ++ctr;
-        if (is_endian.little)
+        if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                 ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -892,7 +884,6 @@ int CRYPTO_gcm128_encrypt(GCM128_CONTEXT *ctx,
                 const unsigned char *in, unsigned char *out,
                 size_t len)
 {
-        const union { long one; char little; } is_endian = {1};
         unsigned int n, ctr;
         size_t i;
         u64        mlen  = ctx->len.u[1];
@@ -920,7 +911,7 @@ int CRYPTO_gcm128_encrypt(GCM128_CONTEXT *ctx,
                 ctx->ares = 0;
         }
 
-        if (is_endian.little)
+        if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                 ctr = BSWAP4(ctx->Yi.d[3]);
 #else
@@ -958,7 +949,7 @@ int CRYPTO_gcm128_encrypt(GCM128_CONTEXT *ctx,
 
                         (*block)(ctx->Yi.c,ctx->EKi.c,key);
                         ++ctr;
-                        if (is_endian.little)
+                        if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                                 ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -984,7 +975,7 @@ int CRYPTO_gcm128_encrypt(GCM128_CONTEXT *ctx,
 
                         (*block)(ctx->Yi.c,ctx->EKi.c,key);
                         ++ctr;
-                        if (is_endian.little)
+                        if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                                 ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -1007,7 +998,7 @@ int CRYPTO_gcm128_encrypt(GCM128_CONTEXT *ctx,
 
                         (*block)(ctx->Yi.c,ctx->EKi.c,key);
                         ++ctr;
-                        if (is_endian.little)
+                        if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                                 ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -1027,7 +1018,7 @@ int CRYPTO_gcm128_encrypt(GCM128_CONTEXT *ctx,
                 if (len) {
                         (*block)(ctx->Yi.c,ctx->EKi.c,key);
                         ++ctr;
-                        if (is_endian.little)
+                        if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                                 ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -1049,7 +1040,7 @@ int CRYPTO_gcm128_encrypt(GCM128_CONTEXT *ctx,
                 if (n==0) {
                         (*block)(ctx->Yi.c,ctx->EKi.c,key);
                         ++ctr;
-                        if (is_endian.little)
+                        if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                                 ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -1072,7 +1063,6 @@ int CRYPTO_gcm128_decrypt(GCM128_CONTEXT *ctx,
                 const unsigned char *in, unsigned char *out,
                 size_t len)
 {
-        const union { long one; char little; } is_endian = {1};
         unsigned int n, ctr;
         size_t i;
         u64        mlen  = ctx->len.u[1];
@@ -1097,7 +1087,7 @@ int CRYPTO_gcm128_decrypt(GCM128_CONTEXT *ctx,
                 ctx->ares = 0;
         }
 
-        if (is_endian.little)
+        if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                 ctr = BSWAP4(ctx->Yi.d[3]);
 #else
@@ -1138,7 +1128,7 @@ int CRYPTO_gcm128_decrypt(GCM128_CONTEXT *ctx,
 
                         (*block)(ctx->Yi.c,ctx->EKi.c,key);
                         ++ctr;
-                        if (is_endian.little)
+                        if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                                 ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -1162,7 +1152,7 @@ int CRYPTO_gcm128_decrypt(GCM128_CONTEXT *ctx,
 
                         (*block)(ctx->Yi.c,ctx->EKi.c,key);
                         ++ctr;
-                        if (is_endian.little)
+                        if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                                 ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -1184,7 +1174,7 @@ int CRYPTO_gcm128_decrypt(GCM128_CONTEXT *ctx,
 
                         (*block)(ctx->Yi.c,ctx->EKi.c,key);
                         ++ctr;
-                        if (is_endian.little)
+                        if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                                 ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -1206,7 +1196,7 @@ int CRYPTO_gcm128_decrypt(GCM128_CONTEXT *ctx,
                 if (len) {
                         (*block)(ctx->Yi.c,ctx->EKi.c,key);
                         ++ctr;
-                        if (is_endian.little)
+                        if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                                 ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -1231,7 +1221,7 @@ int CRYPTO_gcm128_decrypt(GCM128_CONTEXT *ctx,
                 if (n==0) {
                         (*block)(ctx->Yi.c,ctx->EKi.c,key);
                         ++ctr;
-                        if (is_endian.little)
+                        if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                                 ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -1256,7 +1246,6 @@ int CRYPTO_gcm128_encrypt_ctr32(GCM128_CONTEXT *ctx,
                 const unsigned char *in, unsigned char *out,
                 size_t len, ctr128_f stream)
 {
-        const union { long one; char little; } is_endian = {1};
         unsigned int n, ctr;
         size_t i;
         u64   mlen = ctx->len.u[1];
@@ -1280,7 +1269,7 @@ int CRYPTO_gcm128_encrypt_ctr32(GCM128_CONTEXT *ctx,
                 ctx->ares = 0;
         }
 
-        if (is_endian.little)
+        if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                 ctr = BSWAP4(ctx->Yi.d[3]);
 #else
@@ -1306,7 +1295,7 @@ int CRYPTO_gcm128_encrypt_ctr32(GCM128_CONTEXT *ctx,
         while (len>=GHASH_CHUNK) {
                 (*stream)(in,out,GHASH_CHUNK/16,key,ctx->Yi.c);
                 ctr += GHASH_CHUNK/16;
-                if (is_endian.little)
+                if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                         ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -1325,7 +1314,7 @@ int CRYPTO_gcm128_encrypt_ctr32(GCM128_CONTEXT *ctx,
 
                 (*stream)(in,out,j,key,ctx->Yi.c);
                 ctr += (unsigned int)j;
-                if (is_endian.little)
+                if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                         ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -1349,7 +1338,7 @@ int CRYPTO_gcm128_encrypt_ctr32(GCM128_CONTEXT *ctx,
         if (len) {
                 (*ctx->block)(ctx->Yi.c,ctx->EKi.c,key);
                 ++ctr;
-                if (is_endian.little)
+                if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                         ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -1371,7 +1360,6 @@ int CRYPTO_gcm128_decrypt_ctr32(GCM128_CONTEXT *ctx,
                 const unsigned char *in, unsigned char *out,
                 size_t len,ctr128_f stream)
 {
-        const union { long one; char little; } is_endian = {1};
         unsigned int n, ctr;
         size_t i;
         u64   mlen = ctx->len.u[1];
@@ -1395,7 +1383,7 @@ int CRYPTO_gcm128_decrypt_ctr32(GCM128_CONTEXT *ctx,
                 ctx->ares = 0;
         }
 
-        if (is_endian.little)
+        if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                 ctr = BSWAP4(ctx->Yi.d[3]);
 #else
@@ -1424,7 +1412,7 @@ int CRYPTO_gcm128_decrypt_ctr32(GCM128_CONTEXT *ctx,
                 GHASH(ctx,in,GHASH_CHUNK);
                 (*stream)(in,out,GHASH_CHUNK/16,key,ctx->Yi.c);
                 ctr += GHASH_CHUNK/16;
-                if (is_endian.little)
+                if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                         ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -1454,7 +1442,7 @@ int CRYPTO_gcm128_decrypt_ctr32(GCM128_CONTEXT *ctx,
 #endif
                 (*stream)(in,out,j,key,ctx->Yi.c);
                 ctr += (unsigned int)j;
-                if (is_endian.little)
+                if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                         ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -1469,7 +1457,7 @@ int CRYPTO_gcm128_decrypt_ctr32(GCM128_CONTEXT *ctx,
         if (len) {
                 (*ctx->block)(ctx->Yi.c,ctx->EKi.c,key);
                 ++ctr;
-                if (is_endian.little)
+                if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                         ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -1492,7 +1480,6 @@ int CRYPTO_gcm128_decrypt_ctr32(GCM128_CONTEXT *ctx,
 int CRYPTO_gcm128_finish(GCM128_CONTEXT *ctx,const unsigned char *tag,
                         size_t len)
 {
-        const union { long one; char little; } is_endian = {1};
         u64 alen = ctx->len.u[0]<<3;
         u64 clen = ctx->len.u[1]<<3;
 #ifdef GCM_FUNCREF_4BIT
@@ -1502,7 +1489,7 @@ int CRYPTO_gcm128_finish(GCM128_CONTEXT *ctx,const unsigned char *tag,
         if (ctx->mres || ctx->ares)
                 GCM_MUL(ctx,Xi);
 
-        if (is_endian.little) {
+        if (_BYTE_ORDER == _LITTLE_ENDIAN) {
 #ifdef BSWAP8
                 alen = BSWAP8(alen);
                 clen = BSWAP8(clen);
diff --git a/src/lib/libcrypto/modes/modes_lcl.h b/src/lib/libcrypto/modes/modes_lcl.h
index b32c1b43c5..9057f7fd76 100644
--- a/src/lib/libcrypto/modes/modes_lcl.h
+++ b/src/lib/libcrypto/modes/modes_lcl.h
@@ -6,6 +6,7 @@
  */
 
 #include <openssl/modes.h>
+#include <machine/endian.h>
 
 
 #if (defined(_WIN32) || defined(_WIN64)) && !defined(__MINGW32__)
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);
diff --git a/src/lib/libcrypto/rc4/rc4_enc.c b/src/lib/libcrypto/rc4/rc4_enc.c
index 8c4fc6c7a3..d8fc939dac 100644
--- a/src/lib/libcrypto/rc4/rc4_enc.c
+++ b/src/lib/libcrypto/rc4/rc4_enc.c
@@ -56,6 +56,7 @@
  * [including the GNU Public Licence.]
  */
 
+#include <machine/endian.h>
 #include <openssl/rc4.h>
 #include "rc4_locl.h"
 
@@ -124,7 +125,6 @@ void RC4(RC4_KEY *key, size_t len, const unsigned char *indata,
                ((size_t)outdata & (sizeof(RC4_CHUNK)-1)) ) == 0 )
                 {
                 RC4_CHUNK ichunk,otp;
-                const union { long one; char little; } is_endian = {1};
 
                 /*
                  * I reckon we can afford to implement both endian
@@ -132,14 +132,10 @@ void RC4(RC4_KEY *key, size_t len, const unsigned char *indata,
                  * because the machine code appears to be very compact
                  * and redundant 1-2KB is perfectly tolerable (i.e.
                  * in case the compiler fails to eliminate it:-). By
-                 * suggestion from Terrel Larson <terr@terralogic.net>
-                 * who also stands for the is_endian union:-)
+                 * suggestion from Terrel Larson <terr@terralogic.net>.
                  *
                  * Special notes.
                  *
-                 * - is_endian is declared automatic as doing otherwise
-                 *   (declaring static) prevents gcc from eliminating
-                 *   the redundant code;
                  * - compilers (those I've tried) don't seem to have
                  *   problems eliminating either the operators guarded
                  *   by "if (sizeof(RC4_CHUNK)==8)" or the condition
@@ -154,7 +150,7 @@ void RC4(RC4_KEY *key, size_t len, const unsigned char *indata,
                  *
                  *                      <appro@fy.chalmers.se>
                  */
-                if (!is_endian.little)
+                if (_BYTE_ORDER != _LITTLE_ENDIAN)
                         {       /* BIG-ENDIAN CASE */
 # define BESHFT(c)      (((sizeof(RC4_CHUNK)-(c)-1)*8)&(sizeof(RC4_CHUNK)*8-1))
                         for (;len&(0-sizeof(RC4_CHUNK));len-=sizeof(RC4_CHUNK))
diff --git a/src/lib/libcrypto/sha/sha256.c b/src/lib/libcrypto/sha/sha256.c
index 4eae074849..e767afde5a 100644
--- a/src/lib/libcrypto/sha/sha256.c
+++ b/src/lib/libcrypto/sha/sha256.c
@@ -9,6 +9,7 @@
 
 #include <stdlib.h>
 #include <string.h>
+#include <machine/endian.h>
 
 #include <openssl/crypto.h>
 #include <openssl/sha.h>
@@ -206,14 +207,14 @@ static void sha256_block_data_order (SHA256_CTX *ctx, const void *in, size_t num
         SHA_LONG        X[16];
         int i;
         const unsigned char *data=in;
-        const union { long one; char little; } is_endian = {1};
 
                         while (num--) {
 
         a = ctx->h[0];  b = ctx->h[1];  c = ctx->h[2];  d = ctx->h[3];
         e = ctx->h[4];  f = ctx->h[5];  g = ctx->h[6];  h = ctx->h[7];
 
-        if (!is_endian.little && sizeof(SHA_LONG)==4 && ((size_t)in%4)==0)
+        if (_BYTE_ORDER != _LITTLE_ENDIAN &&
+            sizeof(SHA_LONG)==4 && ((size_t)in%4)==0)
                 {
                 const SHA_LONG *W=(const SHA_LONG *)data;
 
diff --git a/src/lib/libcrypto/sha/sha_locl.h b/src/lib/libcrypto/sha/sha_locl.h
index 6c6cd64282..1210176dda 100644
--- a/src/lib/libcrypto/sha/sha_locl.h
+++ b/src/lib/libcrypto/sha/sha_locl.h
@@ -202,6 +202,7 @@ fips_md_init_ctx(SHA1, SHA)
 #endif
 
 #if !defined(SHA_1) || !defined(SHA1_ASM)
+#include <machine/endian.h>
 static void HASH_BLOCK_DATA_ORDER (SHA_CTX *c, const void *p, size_t num)
         {
         const unsigned char *data=p;
@@ -221,9 +222,9 @@ static void HASH_BLOCK_DATA_ORDER (SHA_CTX *c, const void *p, size_t num)
 
         for (;;)
                         {
-        const union { long one; char little; } is_endian = {1};
 
-        if (!is_endian.little && sizeof(SHA_LONG)==4 && ((size_t)p%4)==0)
+        if (_BYTE_ORDER != _LITTLE_ENDIAN &&
+            sizeof(SHA_LONG)==4 && ((size_t)p%4)==0)
                 {
                 const SHA_LONG *W=(const SHA_LONG *)data;
 
diff --git a/src/lib/libssl/d1_pkt.c b/src/lib/libssl/d1_pkt.c
index 80a4c076bf..7cfada4e6b 100644
--- a/src/lib/libssl/d1_pkt.c
+++ b/src/lib/libssl/d1_pkt.c
@@ -115,6 +115,7 @@
 
 #include <stdio.h>
 #include <errno.h>
+#include <machine/endian.h>
 #include "ssl_locl.h"
 #include <openssl/evp.h>
 #include <openssl/buffer.h>
@@ -129,13 +130,9 @@ satsub64be(const unsigned char *v1, const unsigned char *v2)
 
         if (sizeof(long) == 8)
                 do {
-                        const union {
-                                long one;
-                                char little;
-                        } is_endian = {1};
                         long l;
 
-                        if (is_endian.little)
+                        if (_BYTE_ORDER == _LITTLE_ENDIAN)
                                 break;
                         /* not reached on little-endians */
                         /* following test is redundant, because input is
diff --git a/src/lib/libssl/src/crypto/evp/bio_ok.c b/src/lib/libssl/src/crypto/evp/bio_ok.c
index fdb742f554..09a762ffac 100644
--- a/src/lib/libssl/src/crypto/evp/bio_ok.c
+++ b/src/lib/libssl/src/crypto/evp/bio_ok.c
@@ -120,6 +120,7 @@
 #include <stdio.h>
 #include <errno.h>
 #include <assert.h>
+#include <machine/endian.h>
 #include "cryptlib.h"
 #include <openssl/buffer.h>
 #include <openssl/bio.h>
@@ -463,9 +464,8 @@ static long ok_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
         }
 
 static void longswap(void *_ptr, size_t len)
-{       const union { long one; char little; } is_endian = {1};
-
-        if (is_endian.little) {
+{
+        if (_BYTE_ORDER == _LITTLE_ENDIAN) {
                 size_t i;
                 unsigned char *p=_ptr,c;
 
diff --git a/src/lib/libssl/src/crypto/modes/ctr128.c b/src/lib/libssl/src/crypto/modes/ctr128.c
index ee642c5863..96af854f8a 100644
--- a/src/lib/libssl/src/crypto/modes/ctr128.c
+++ b/src/lib/libssl/src/crypto/modes/ctr128.c
@@ -77,11 +77,12 @@ static void ctr128_inc(unsigned char *counter) {
 }
 
 #if !defined(OPENSSL_SMALL_FOOTPRINT)
-static void ctr128_inc_aligned(unsigned char *counter) {
+static void
+ctr128_inc_aligned(unsigned char *counter)
+{
         size_t *data,c,n;
-        const union { long one; char little; } is_endian = {1};
 
-        if (is_endian.little) {
+        if (_BYTE_ORDER == _LITTLE_ENDIAN) {
                 ctr128_inc(counter);
                 return;
         }
diff --git a/src/lib/libssl/src/crypto/modes/gcm128.c b/src/lib/libssl/src/crypto/modes/gcm128.c
index a495db110f..92b7f4f3c8 100644
--- a/src/lib/libssl/src/crypto/modes/gcm128.c
+++ b/src/lib/libssl/src/crypto/modes/gcm128.c
@@ -147,7 +147,6 @@ static void gcm_gmult_8bit(u64 Xi[2], const u128 Htable[256])
         u128 Z = { 0, 0};
         const u8 *xi = (const u8 *)Xi+15;
         size_t rem, n = *xi;
-        const union { long one; char little; } is_endian = {1};
         static const size_t rem_8bit[256] = {
                 PACK(0x0000), PACK(0x01C2), PACK(0x0384), PACK(0x0246),
                 PACK(0x0708), PACK(0x06CA), PACK(0x048C), PACK(0x054E),
@@ -231,7 +230,7 @@ static void gcm_gmult_8bit(u64 Xi[2], const u128 Htable[256])
                         Z.hi ^= (u64)rem_8bit[rem]<<32;
         }
 
-        if (is_endian.little) {
+        if (_BYTE_ORDER == _LITTLE_ENDIAN) {
 #ifdef BSWAP8
                 Xi[0] = BSWAP8(Z.hi);
                 Xi[1] = BSWAP8(Z.lo);
@@ -307,9 +306,8 @@ static void gcm_init_4bit(u128 Htable[16], u64 H[2])
          */
         {
         int j;
-        const union { long one; char little; } is_endian = {1};
 
-        if (is_endian.little)
+        if (_BYTE_ORDER == _LITTLE_ENDIAN)
                 for (j=0;j<16;++j) {
                         V = Htable[j];
                         Htable[j].hi = V.lo;
@@ -337,7 +335,6 @@ static void gcm_gmult_4bit(u64 Xi[2], const u128 Htable[16])
         u128 Z;
         int cnt = 15;
         size_t rem, nlo, nhi;
-        const union { long one; char little; } is_endian = {1};
 
         nlo  = ((const u8 *)Xi)[15];
         nhi  = nlo>>4;
@@ -376,7 +373,7 @@ static void gcm_gmult_4bit(u64 Xi[2], const u128 Htable[16])
                 Z.lo ^= Htable[nlo].lo;
         }
 
-        if (is_endian.little) {
+        if (_BYTE_ORDER == _LITTLE_ENDIAN) {
 #ifdef BSWAP8
                 Xi[0] = BSWAP8(Z.hi);
                 Xi[1] = BSWAP8(Z.lo);
@@ -409,7 +406,6 @@ static void gcm_ghash_4bit(u64 Xi[2],const u128 Htable[16],
     u128 Z;
     int cnt;
     size_t rem, nlo, nhi;
-    const union { long one; char little; } is_endian = {1};
 
 #if 1
     do {
@@ -546,7 +542,7 @@ static void gcm_ghash_4bit(u64 Xi[2],const u128 Htable[16],
         Z.hi ^= ((u64)rem_8bit[rem<<4])<<48;
 #endif
 
-        if (is_endian.little) {
+        if (_BYTE_ORDER == _LITTLE_ENDIAN) {
 #ifdef BSWAP8
                 Xi[0] = BSWAP8(Z.hi);
                 Xi[1] = BSWAP8(Z.lo);
@@ -588,13 +584,12 @@ static void gcm_gmult_1bit(u64 Xi[2],const u64 H[2])
         long X;
         int  i,j;
         const long *xi = (const long *)Xi;
-        const union { long one; char little; } is_endian = {1};
 
         V.hi = H[0];    /* H is in host byte order, no byte swapping */
         V.lo = H[1];
 
         for (j=0; j<16/sizeof(long); ++j) {
-                if (is_endian.little) {
+                if (_BYTE_ORDER == _LITTLE_ENDIAN) {
                         if (sizeof(long)==8) {
 #ifdef BSWAP8
                                 X = (long)(BSWAP8(xi[j]));
@@ -620,7 +615,7 @@ static void gcm_gmult_1bit(u64 Xi[2],const u64 H[2])
                 }
         }
 
-        if (is_endian.little) {
+        if (_BYTE_ORDER == _LITTLE_ENDIAN) {
 #ifdef BSWAP8
                 Xi[0] = BSWAP8(Z.hi);
                 Xi[1] = BSWAP8(Z.lo);
@@ -685,15 +680,13 @@ void gcm_ghash_neon(u64 Xi[2],const u128 Htable[16],const u8 *inp,size_t len);
 
 void CRYPTO_gcm128_init(GCM128_CONTEXT *ctx,void *key,block128_f block)
 {
-        const union { long one; char little; } is_endian = {1};
-
         memset(ctx,0,sizeof(*ctx));
         ctx->block = block;
         ctx->key   = key;
 
         (*block)(ctx->H.c,ctx->H.c,key);
 
-        if (is_endian.little) {
+        if (_BYTE_ORDER == _LITTLE_ENDIAN) {
                 /* H is stored in host byte order */
 #ifdef BSWAP8
                 ctx->H.u[0] = BSWAP8(ctx->H.u[0]);
@@ -755,7 +748,6 @@ void CRYPTO_gcm128_init(GCM128_CONTEXT *ctx,void *key,block128_f block)
 
 void CRYPTO_gcm128_setiv(GCM128_CONTEXT *ctx,const unsigned char *iv,size_t len)
 {
-        const union { long one; char little; } is_endian = {1};
         unsigned int ctr;
 #ifdef GCM_FUNCREF_4BIT
         void (*gcm_gmult_p)(u64 Xi[2],const u128 Htable[16])    = ctx->gmult;
@@ -790,7 +782,7 @@ void CRYPTO_gcm128_setiv(GCM128_CONTEXT *ctx,const unsigned char *iv,size_t len)
                         GCM_MUL(ctx,Yi);
                 }
                 len0 <<= 3;
-                if (is_endian.little) {
+                if (_BYTE_ORDER == _LITTLE_ENDIAN) {
 #ifdef BSWAP8
                         ctx->Yi.u[1]  ^= BSWAP8(len0);
 #else
@@ -809,7 +801,7 @@ void CRYPTO_gcm128_setiv(GCM128_CONTEXT *ctx,const unsigned char *iv,size_t len)
 
                 GCM_MUL(ctx,Yi);
 
-                if (is_endian.little)
+                if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                         ctr = BSWAP4(ctx->Yi.d[3]);
 #else
@@ -821,7 +813,7 @@ void CRYPTO_gcm128_setiv(GCM128_CONTEXT *ctx,const unsigned char *iv,size_t len)
 
         (*ctx->block)(ctx->Yi.c,ctx->EK0.c,ctx->key);
         ++ctr;
-        if (is_endian.little)
+        if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                 ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -892,7 +884,6 @@ int CRYPTO_gcm128_encrypt(GCM128_CONTEXT *ctx,
                 const unsigned char *in, unsigned char *out,
                 size_t len)
 {
-        const union { long one; char little; } is_endian = {1};
         unsigned int n, ctr;
         size_t i;
         u64        mlen  = ctx->len.u[1];
@@ -920,7 +911,7 @@ int CRYPTO_gcm128_encrypt(GCM128_CONTEXT *ctx,
                 ctx->ares = 0;
         }
 
-        if (is_endian.little)
+        if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                 ctr = BSWAP4(ctx->Yi.d[3]);
 #else
@@ -958,7 +949,7 @@ int CRYPTO_gcm128_encrypt(GCM128_CONTEXT *ctx,
 
                         (*block)(ctx->Yi.c,ctx->EKi.c,key);
                         ++ctr;
-                        if (is_endian.little)
+                        if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                                 ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -984,7 +975,7 @@ int CRYPTO_gcm128_encrypt(GCM128_CONTEXT *ctx,
 
                         (*block)(ctx->Yi.c,ctx->EKi.c,key);
                         ++ctr;
-                        if (is_endian.little)
+                        if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                                 ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -1007,7 +998,7 @@ int CRYPTO_gcm128_encrypt(GCM128_CONTEXT *ctx,
 
                         (*block)(ctx->Yi.c,ctx->EKi.c,key);
                         ++ctr;
-                        if (is_endian.little)
+                        if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                                 ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -1027,7 +1018,7 @@ int CRYPTO_gcm128_encrypt(GCM128_CONTEXT *ctx,
                 if (len) {
                         (*block)(ctx->Yi.c,ctx->EKi.c,key);
                         ++ctr;
-                        if (is_endian.little)
+                        if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                                 ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -1049,7 +1040,7 @@ int CRYPTO_gcm128_encrypt(GCM128_CONTEXT *ctx,
                 if (n==0) {
                         (*block)(ctx->Yi.c,ctx->EKi.c,key);
                         ++ctr;
-                        if (is_endian.little)
+                        if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                                 ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -1072,7 +1063,6 @@ int CRYPTO_gcm128_decrypt(GCM128_CONTEXT *ctx,
                 const unsigned char *in, unsigned char *out,
                 size_t len)
 {
-        const union { long one; char little; } is_endian = {1};
         unsigned int n, ctr;
         size_t i;
         u64        mlen  = ctx->len.u[1];
@@ -1097,7 +1087,7 @@ int CRYPTO_gcm128_decrypt(GCM128_CONTEXT *ctx,
                 ctx->ares = 0;
         }
 
-        if (is_endian.little)
+        if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                 ctr = BSWAP4(ctx->Yi.d[3]);
 #else
@@ -1138,7 +1128,7 @@ int CRYPTO_gcm128_decrypt(GCM128_CONTEXT *ctx,
 
                         (*block)(ctx->Yi.c,ctx->EKi.c,key);
                         ++ctr;
-                        if (is_endian.little)
+                        if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                                 ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -1162,7 +1152,7 @@ int CRYPTO_gcm128_decrypt(GCM128_CONTEXT *ctx,
 
                         (*block)(ctx->Yi.c,ctx->EKi.c,key);
                         ++ctr;
-                        if (is_endian.little)
+                        if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                                 ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -1184,7 +1174,7 @@ int CRYPTO_gcm128_decrypt(GCM128_CONTEXT *ctx,
 
                         (*block)(ctx->Yi.c,ctx->EKi.c,key);
                         ++ctr;
-                        if (is_endian.little)
+                        if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                                 ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -1206,7 +1196,7 @@ int CRYPTO_gcm128_decrypt(GCM128_CONTEXT *ctx,
                 if (len) {
                         (*block)(ctx->Yi.c,ctx->EKi.c,key);
                         ++ctr;
-                        if (is_endian.little)
+                        if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                                 ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -1231,7 +1221,7 @@ int CRYPTO_gcm128_decrypt(GCM128_CONTEXT *ctx,
                 if (n==0) {
                         (*block)(ctx->Yi.c,ctx->EKi.c,key);
                         ++ctr;
-                        if (is_endian.little)
+                        if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                                 ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -1256,7 +1246,6 @@ int CRYPTO_gcm128_encrypt_ctr32(GCM128_CONTEXT *ctx,
                 const unsigned char *in, unsigned char *out,
                 size_t len, ctr128_f stream)
 {
-        const union { long one; char little; } is_endian = {1};
         unsigned int n, ctr;
         size_t i;
         u64   mlen = ctx->len.u[1];
@@ -1280,7 +1269,7 @@ int CRYPTO_gcm128_encrypt_ctr32(GCM128_CONTEXT *ctx,
                 ctx->ares = 0;
         }
 
-        if (is_endian.little)
+        if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                 ctr = BSWAP4(ctx->Yi.d[3]);
 #else
@@ -1306,7 +1295,7 @@ int CRYPTO_gcm128_encrypt_ctr32(GCM128_CONTEXT *ctx,
         while (len>=GHASH_CHUNK) {
                 (*stream)(in,out,GHASH_CHUNK/16,key,ctx->Yi.c);
                 ctr += GHASH_CHUNK/16;
-                if (is_endian.little)
+                if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                         ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -1325,7 +1314,7 @@ int CRYPTO_gcm128_encrypt_ctr32(GCM128_CONTEXT *ctx,
 
                 (*stream)(in,out,j,key,ctx->Yi.c);
                 ctr += (unsigned int)j;
-                if (is_endian.little)
+                if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                         ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -1349,7 +1338,7 @@ int CRYPTO_gcm128_encrypt_ctr32(GCM128_CONTEXT *ctx,
         if (len) {
                 (*ctx->block)(ctx->Yi.c,ctx->EKi.c,key);
                 ++ctr;
-                if (is_endian.little)
+                if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                         ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -1371,7 +1360,6 @@ int CRYPTO_gcm128_decrypt_ctr32(GCM128_CONTEXT *ctx,
                 const unsigned char *in, unsigned char *out,
                 size_t len,ctr128_f stream)
 {
-        const union { long one; char little; } is_endian = {1};
         unsigned int n, ctr;
         size_t i;
         u64   mlen = ctx->len.u[1];
@@ -1395,7 +1383,7 @@ int CRYPTO_gcm128_decrypt_ctr32(GCM128_CONTEXT *ctx,
                 ctx->ares = 0;
         }
 
-        if (is_endian.little)
+        if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                 ctr = BSWAP4(ctx->Yi.d[3]);
 #else
@@ -1424,7 +1412,7 @@ int CRYPTO_gcm128_decrypt_ctr32(GCM128_CONTEXT *ctx,
                 GHASH(ctx,in,GHASH_CHUNK);
                 (*stream)(in,out,GHASH_CHUNK/16,key,ctx->Yi.c);
                 ctr += GHASH_CHUNK/16;
-                if (is_endian.little)
+                if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                         ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -1454,7 +1442,7 @@ int CRYPTO_gcm128_decrypt_ctr32(GCM128_CONTEXT *ctx,
 #endif
                 (*stream)(in,out,j,key,ctx->Yi.c);
                 ctr += (unsigned int)j;
-                if (is_endian.little)
+                if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                         ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -1469,7 +1457,7 @@ int CRYPTO_gcm128_decrypt_ctr32(GCM128_CONTEXT *ctx,
         if (len) {
                 (*ctx->block)(ctx->Yi.c,ctx->EKi.c,key);
                 ++ctr;
-                if (is_endian.little)
+                if (_BYTE_ORDER == _LITTLE_ENDIAN)
 #ifdef BSWAP4
                         ctx->Yi.d[3] = BSWAP4(ctr);
 #else
@@ -1492,7 +1480,6 @@ int CRYPTO_gcm128_decrypt_ctr32(GCM128_CONTEXT *ctx,
 int CRYPTO_gcm128_finish(GCM128_CONTEXT *ctx,const unsigned char *tag,
                         size_t len)
 {
-        const union { long one; char little; } is_endian = {1};
         u64 alen = ctx->len.u[0]<<3;
         u64 clen = ctx->len.u[1]<<3;
 #ifdef GCM_FUNCREF_4BIT
@@ -1502,7 +1489,7 @@ int CRYPTO_gcm128_finish(GCM128_CONTEXT *ctx,const unsigned char *tag,
         if (ctx->mres || ctx->ares)
                 GCM_MUL(ctx,Xi);
 
-        if (is_endian.little) {
+        if (_BYTE_ORDER == _LITTLE_ENDIAN) {
 #ifdef BSWAP8
                 alen = BSWAP8(alen);
                 clen = BSWAP8(clen);
diff --git a/src/lib/libssl/src/crypto/modes/modes_lcl.h b/src/lib/libssl/src/crypto/modes/modes_lcl.h
index b32c1b43c5..9057f7fd76 100644
--- a/src/lib/libssl/src/crypto/modes/modes_lcl.h
+++ b/src/lib/libssl/src/crypto/modes/modes_lcl.h
@@ -6,6 +6,7 @@
  */
 
 #include <openssl/modes.h>
+#include <machine/endian.h>
 
 
 #if (defined(_WIN32) || defined(_WIN64)) && !defined(__MINGW32__)
diff --git a/src/lib/libssl/src/crypto/modes/xts128.c b/src/lib/libssl/src/crypto/modes/xts128.c
index 9cf27a25e9..de23de457d 100644
--- a/src/lib/libssl/src/crypto/modes/xts128.c
+++ b/src/lib/libssl/src/crypto/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);
diff --git a/src/lib/libssl/src/crypto/rc4/rc4_enc.c b/src/lib/libssl/src/crypto/rc4/rc4_enc.c
index 8c4fc6c7a3..d8fc939dac 100644
--- a/src/lib/libssl/src/crypto/rc4/rc4_enc.c
+++ b/src/lib/libssl/src/crypto/rc4/rc4_enc.c
@@ -56,6 +56,7 @@
  * [including the GNU Public Licence.]
  */
 
+#include <machine/endian.h>
 #include <openssl/rc4.h>
 #include "rc4_locl.h"
 
@@ -124,7 +125,6 @@ void RC4(RC4_KEY *key, size_t len, const unsigned char *indata,
                ((size_t)outdata & (sizeof(RC4_CHUNK)-1)) ) == 0 )
                 {
                 RC4_CHUNK ichunk,otp;
-                const union { long one; char little; } is_endian = {1};
 
                 /*
                  * I reckon we can afford to implement both endian
@@ -132,14 +132,10 @@ void RC4(RC4_KEY *key, size_t len, const unsigned char *indata,
                  * because the machine code appears to be very compact
                  * and redundant 1-2KB is perfectly tolerable (i.e.
                  * in case the compiler fails to eliminate it:-). By
-                 * suggestion from Terrel Larson <terr@terralogic.net>
-                 * who also stands for the is_endian union:-)
+                 * suggestion from Terrel Larson <terr@terralogic.net>.
                  *
                  * Special notes.
                  *
-                 * - is_endian is declared automatic as doing otherwise
-                 *   (declaring static) prevents gcc from eliminating
-                 *   the redundant code;
                  * - compilers (those I've tried) don't seem to have
                  *   problems eliminating either the operators guarded
                  *   by "if (sizeof(RC4_CHUNK)==8)" or the condition
@@ -154,7 +150,7 @@ void RC4(RC4_KEY *key, size_t len, const unsigned char *indata,
                  *
                  *                      <appro@fy.chalmers.se>
                  */
-                if (!is_endian.little)
+                if (_BYTE_ORDER != _LITTLE_ENDIAN)
                         {       /* BIG-ENDIAN CASE */
 # define BESHFT(c)      (((sizeof(RC4_CHUNK)-(c)-1)*8)&(sizeof(RC4_CHUNK)*8-1))
                         for (;len&(0-sizeof(RC4_CHUNK));len-=sizeof(RC4_CHUNK))
diff --git a/src/lib/libssl/src/crypto/sha/sha256.c b/src/lib/libssl/src/crypto/sha/sha256.c
index 4eae074849..e767afde5a 100644
--- a/src/lib/libssl/src/crypto/sha/sha256.c
+++ b/src/lib/libssl/src/crypto/sha/sha256.c
@@ -9,6 +9,7 @@
 
 #include <stdlib.h>
 #include <string.h>
+#include <machine/endian.h>
 
 #include <openssl/crypto.h>
 #include <openssl/sha.h>
@@ -206,14 +207,14 @@ static void sha256_block_data_order (SHA256_CTX *ctx, const void *in, size_t num
         SHA_LONG        X[16];
         int i;
         const unsigned char *data=in;
-        const union { long one; char little; } is_endian = {1};
 
                         while (num--) {
 
         a = ctx->h[0];  b = ctx->h[1];  c = ctx->h[2];  d = ctx->h[3];
         e = ctx->h[4];  f = ctx->h[5];  g = ctx->h[6];  h = ctx->h[7];
 
-        if (!is_endian.little && sizeof(SHA_LONG)==4 && ((size_t)in%4)==0)
+        if (_BYTE_ORDER != _LITTLE_ENDIAN &&
+            sizeof(SHA_LONG)==4 && ((size_t)in%4)==0)
                 {
                 const SHA_LONG *W=(const SHA_LONG *)data;
 
diff --git a/src/lib/libssl/src/crypto/sha/sha_locl.h b/src/lib/libssl/src/crypto/sha/sha_locl.h
index 6c6cd64282..1210176dda 100644
--- a/src/lib/libssl/src/crypto/sha/sha_locl.h
+++ b/src/lib/libssl/src/crypto/sha/sha_locl.h
@@ -202,6 +202,7 @@ fips_md_init_ctx(SHA1, SHA)
 #endif
 
 #if !defined(SHA_1) || !defined(SHA1_ASM)
+#include <machine/endian.h>
 static void HASH_BLOCK_DATA_ORDER (SHA_CTX *c, const void *p, size_t num)
         {
         const unsigned char *data=p;
@@ -221,9 +222,9 @@ static void HASH_BLOCK_DATA_ORDER (SHA_CTX *c, const void *p, size_t num)
 
         for (;;)
                         {
-        const union { long one; char little; } is_endian = {1};
 
-        if (!is_endian.little && sizeof(SHA_LONG)==4 && ((size_t)p%4)==0)
+        if (_BYTE_ORDER != _LITTLE_ENDIAN &&
+            sizeof(SHA_LONG)==4 && ((size_t)p%4)==0)
                 {
                 const SHA_LONG *W=(const SHA_LONG *)data;
 
diff --git a/src/lib/libssl/src/ssl/d1_pkt.c b/src/lib/libssl/src/ssl/d1_pkt.c
index 80a4c076bf..7cfada4e6b 100644
--- a/src/lib/libssl/src/ssl/d1_pkt.c
+++ b/src/lib/libssl/src/ssl/d1_pkt.c
@@ -115,6 +115,7 @@
 
 #include <stdio.h>
 #include <errno.h>
+#include <machine/endian.h>
 #include "ssl_locl.h"
 #include <openssl/evp.h>
 #include <openssl/buffer.h>
@@ -129,13 +130,9 @@ satsub64be(const unsigned char *v1, const unsigned char *v2)
 
         if (sizeof(long) == 8)
                 do {
-                        const union {
-                                long one;
-                                char little;
-                        } is_endian = {1};
                         long l;
 
-                        if (is_endian.little)
+                        if (_BYTE_ORDER == _LITTLE_ENDIAN)
                                 break;
                         /* not reached on little-endians */
                         /* following test is redundant, because input is