Squashed commit upgrading to mbedtls-2.28.1

Squash merging branch import/mbedtls-2.28.1

 ebf1f6a58089 ("libmbedtls: compile new files added with 2.28.1")
 3ffb51b58a54 ("libmbedtls: add SM2 curve")
 c425755720b4 ("libmbedtls: mbedtls_mpi_exp_mod(): optimize mempool usage")
 23493c822a82 ("libmbedtls: mbedtls_mpi_exp_mod(): reduce stack usage")
 dcdca2348dff ("libmbedtls: mbedtls_mpi_exp_mod() initialize W")
 dc2994976958 ("libmbedtls: fix no CRT issue")
 c6628873b281 ("libmbedtls: add interfaces in mbedtls for context memory operation")
 8acd202d3e55 ("libmedtls: mpi_miller_rabin: increase count limit")
 37284e28d5d9 ("libmbedtls: add mbedtls_mpi_init_mempool()")
 b499a75f29f3 ("libmbedtls: make mbedtls_mpi_mont*() available")
 2080a8c96a5d ("mbedtls: configure mbedtls to reach for config")
 e0858334327a ("mbedtls: remove default include/mbedtls/config.h")
 dd9688e6b8ce ("Import mbedtls-2.28.1")

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
diff --git a/lib/libmbedtls/mbedtls/library/xtea.c b/lib/libmbedtls/mbedtls/library/xtea.c
index 4b8c9c0..77f6cb6 100644
--- a/lib/libmbedtls/mbedtls/library/xtea.c
+++ b/lib/libmbedtls/mbedtls/library/xtea.c
@@ -37,29 +37,6 @@
 
 #if !defined(MBEDTLS_XTEA_ALT)
 
-/*
- * 32-bit integer manipulation macros (big endian)
- */
-#ifndef GET_UINT32_BE
-#define GET_UINT32_BE(n,b,i)                            \
-{                                                       \
-    (n) = ( (uint32_t) (b)[(i)    ] << 24 )             \
-        | ( (uint32_t) (b)[(i) + 1] << 16 )             \
-        | ( (uint32_t) (b)[(i) + 2] <<  8 )             \
-        | ( (uint32_t) (b)[(i) + 3]       );            \
-}
-#endif
-
-#ifndef PUT_UINT32_BE
-#define PUT_UINT32_BE(n,b,i)                            \
-{                                                       \
-    (b)[(i)    ] = (unsigned char) ( (n) >> 24 );       \
-    (b)[(i) + 1] = (unsigned char) ( (n) >> 16 );       \
-    (b)[(i) + 2] = (unsigned char) ( (n) >>  8 );       \
-    (b)[(i) + 3] = (unsigned char) ( (n)       );       \
-}
-#endif
-
 void mbedtls_xtea_init( mbedtls_xtea_context *ctx )
 {
     memset( ctx, 0, sizeof( mbedtls_xtea_context ) );
@@ -84,7 +61,7 @@
 
     for( i = 0; i < 4; i++ )
     {
-        GET_UINT32_BE( ctx->k[i], key, i << 2 );
+        ctx->k[i] = MBEDTLS_GET_UINT32_BE( key, i << 2 );
     }
 }
 
@@ -98,8 +75,8 @@
 
     k = ctx->k;
 
-    GET_UINT32_BE( v0, input, 0 );
-    GET_UINT32_BE( v1, input, 4 );
+    v0 = MBEDTLS_GET_UINT32_BE( input, 0 );
+    v1 = MBEDTLS_GET_UINT32_BE( input, 4 );
 
     if( mode == MBEDTLS_XTEA_ENCRYPT )
     {
@@ -124,8 +101,8 @@
         }
     }
 
-    PUT_UINT32_BE( v0, output, 0 );
-    PUT_UINT32_BE( v1, output, 4 );
+    MBEDTLS_PUT_UINT32_BE( v0, output, 0 );
+    MBEDTLS_PUT_UINT32_BE( v1, output, 4 );
 
     return( 0 );
 }