diff --git a/tests/suites/test_suite_mpi.data b/tests/suites/test_suite_mpi.data
index c87c4ce..5ef26f7 100644
--- a/tests/suites/test_suite_mpi.data
+++ b/tests/suites/test_suite_mpi.data
@@ -86,34 +86,34 @@
 mbedtls_mpi_core_io_null
 
 Test mbedtls_mpi_core_io_be #1 (Buffer and limbs just fit, input limb-aligned)
-mbedtls_mpi_core_io_be:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":96:12:0:0
+mbedtls_mpi_core_io_be:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":96:24:0:0
 
 Test mbedtls_mpi_core_io_be #2  (Buffer and limbs just fit, input unaligned)
-mbedtls_mpi_core_io_be:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b":94:12:0:0
+mbedtls_mpi_core_io_be:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b":94:24:0:0
 
 Test mbedtls_mpi_core_io_be #3 (Buffer just fits, extra limbs, input limb-aligned)
-mbedtls_mpi_core_io_be:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":96:14:0:0
+mbedtls_mpi_core_io_be:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":96:28:0:0
 
 Test mbedtls_mpi_core_io_be #4 (Buffer just fits, extra limbs, input unaligned)
-mbedtls_mpi_core_io_be:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b":94:14:0:0
+mbedtls_mpi_core_io_be:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b":94:28:0:0
 
 Test mbedtls_mpi_core_io_be #5 (Extra limbs, buffer aligned to extra limbs, input limb-aligned)
-mbedtls_mpi_core_io_be:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":112:14:0:0
+mbedtls_mpi_core_io_be:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":112:28:0:0
 
 Test mbedtls_mpi_core_io_be #6 (Extra limbs, buffer aligned to extra limbs, input unaligned)
-mbedtls_mpi_core_io_be:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b":112:14:0:0
+mbedtls_mpi_core_io_be:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b":112:28:0:0
 
 Test mbedtls_mpi_core_io_be #7 (Buffer and limbs just fit, input limb-aligned with leading zeroes)
-mbedtls_mpi_core_io_be:"00000000000000001fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":88:12:0:0
+mbedtls_mpi_core_io_be:"00000000000000001fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":88:24:0:0
 
 Test mbedtls_mpi_core_io_be #8 (Buffer and limbs just fit, input unaligned with leading zeroes)
-mbedtls_mpi_core_io_be:"00000000000000001fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b":86:12:0:0
+mbedtls_mpi_core_io_be:"00000000000000001fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b":86:24:0:0
 
 Test mbedtls_mpi_core_io_be #9 (Buffer just fits, extra limbs, input limb-aligned with leading zeroes)
-mbedtls_mpi_core_io_be:"00000000000000001fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":88:14:0:0
+mbedtls_mpi_core_io_be:"00000000000000001fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":88:28:0:0
 
 Test mbedtls_mpi_core_io_be #10 (Buffer just fits, extra limbs, input unaligned with leading zeroes)
-mbedtls_mpi_core_io_be:"00000000000000001fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b":86:14:0:0
+mbedtls_mpi_core_io_be:"00000000000000001fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b":86:28:0:0
 
 Test mbedtls_mpi_core_io_be #11 (Zero)
 mbedtls_mpi_core_io_be:"00":1:1:0:0
@@ -127,20 +127,28 @@
 Test mbedtls_mpi_core_io_be #14 (One)
 mbedtls_mpi_core_io_be:"01":1:1:0:0
 
-Test mbedtls_mpi_core_io_be #14 (One limb)
-mbedtls_mpi_core_io_be:"ff00000000000000":8:1:0:0
+Test mbedtls_mpi_core_io_be #15 (One limb, 32 bit)
+depends_on:MBEDTLS_HAVE_INT32
+mbedtls_mpi_core_io_be:"ff000000":4:1:0:0
 
-Test mbedtls_mpi_core_io_be #15 (not enough limbs, input limb-aligned)
-mbedtls_mpi_core_io_be:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":96:11:MBEDTLS_ERR_MPI_BUFFER_TOO_SMALL:0
+Test mbedtls_mpi_core_io_be #16 (One limb, 64 bit)
+depends_on:MBEDTLS_HAVE_INT64
+mbedtls_mpi_core_io_be:"ff00000000000000":8:2:0:0
 
-Test mbedtls_mpi_core_io_be #16 (not enough limbs, input unaligned)
-mbedtls_mpi_core_io_be:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b":94:11:MBEDTLS_ERR_MPI_BUFFER_TOO_SMALL:0
+Test mbedtls_mpi_core_io_be #17 (not enough limbs, input limb-aligned)
+mbedtls_mpi_core_io_be:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":96:22:MBEDTLS_ERR_MPI_BUFFER_TOO_SMALL:0
 
-Test mbedtls_mpi_core_io_be #17 (buffer too small, input limb-aligned)
-mbedtls_mpi_core_io_be:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":95:12:0:MBEDTLS_ERR_MPI_BUFFER_TOO_SMALL
+Test mbedtls_mpi_core_io_be #18 (not enough limbs, input unaligned)
+mbedtls_mpi_core_io_be:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b":94:22:MBEDTLS_ERR_MPI_BUFFER_TOO_SMALL:0
 
-Test mbedtls_mpi_core_io_be #18 (buffer too small, input unaligned)
-mbedtls_mpi_core_io_be:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b":93:12:0:MBEDTLS_ERR_MPI_BUFFER_TOO_SMALL
+Test mbedtls_mpi_core_io_be #19 (buffer too small, input limb-aligned)
+mbedtls_mpi_core_io_be:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":95:24:0:MBEDTLS_ERR_MPI_BUFFER_TOO_SMALL
+
+Test mbedtls_mpi_core_io_be #20 (buffer too small, input unaligned)
+mbedtls_mpi_core_io_be:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b":93:24:0:MBEDTLS_ERR_MPI_BUFFER_TOO_SMALL
+
+Test mbedtls_mpi_core_io_be #21 (Buffer and limbs fit, input unaligned, odd number of limbs)
+mbedtls_mpi_core_io_be:"00de4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":82:21:0:0
 
 Test mbedtls_mpi_core_io_le #1 (Buffer and limbs just fit, input limb-aligned)
 mbedtls_mpi_core_io_le:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":96:12:0:0
diff --git a/tests/suites/test_suite_mpi.function b/tests/suites/test_suite_mpi.function
index d9a1509..cd901d1 100644
--- a/tests/suites/test_suite_mpi.function
+++ b/tests/suites/test_suite_mpi.function
@@ -233,7 +233,7 @@
 /* END_CASE */
 
 /* BEGIN_CASE */
-void mbedtls_mpi_core_io_be( data_t *input, int nb_int, int nx_64_int, int iret,
+void mbedtls_mpi_core_io_be( data_t *input, int nb_int, int nx_32_int, int iret,
                              int oret )
 {
     #define BMAX 1024
@@ -250,12 +250,12 @@
     nb = nb_int;
     TEST_ASSERT( nb <= BMAX );
 
-    TEST_ASSERT( 0 <= nx_64_int );
-    nx = nx_64_int;
-    /* nx_64_int is the number of 64 bit limbs, if we have 32 bit limbs we need
-     * to double the number of limbs to have the same size. */
-    if( sizeof( mbedtls_mpi_uint ) == 4 )
-        nx *= 2;
+    TEST_ASSERT( 0 <= nx_32_int );
+    nx = nx_32_int;
+    /* nx_32_int is the number of 32 bit limbs, if we have 64 bit limbs we need
+     * to halve the number of limbs to have the same size. */
+    if( sizeof( mbedtls_mpi_uint ) == 8 )
+        nx = nx / 2 + nx % 2;
     TEST_ASSERT( nx <= XMAX );
 
     ret =  mbedtls_mpi_core_read_be( X, nx, input->x, input->len );