diff --git a/tests/suites/test_suite_mpi.data b/tests/suites/test_suite_mpi.data
index e52953c..6a32273 100644
--- a/tests/suites/test_suite_mpi.data
+++ b/tests/suites/test_suite_mpi.data
@@ -199,6 +199,132 @@
 Test mbedtls_mpi_core_io_le #18 (buffer too small, input unaligned)
 mbedtls_mpi_core_io_le:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b":93:12:0:MBEDTLS_ERR_MPI_BUFFER_TOO_SMALL
 
+Test mbedtls_mpi_mod_raw_io #1 BE (Buffer and limbs just fit, input limb-aligned)
+mbedtls_mpi_mod_raw_io:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":96:12:MBEDTLS_MPI_MOD_EXT_REP_BE:0:0
+
+Test mbedtls_mpi_mod_raw_io #1 LE (Buffer and limbs just fit, input limb-aligned)
+mbedtls_mpi_mod_raw_io:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":96:12:MBEDTLS_MPI_MOD_EXT_REP_LE:0:0
+
+Test mbedtls_mpi_mod_raw_io #2 BE (Buffer and limbs just fit, input unaligned)
+mbedtls_mpi_mod_raw_io:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b":94:12:MBEDTLS_MPI_MOD_EXT_REP_BE:0:0
+
+Test mbedtls_mpi_mod_raw_io #2 LE  (Buffer and limbs just fit, input unaligned)
+mbedtls_mpi_mod_raw_io:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b":94:12:MBEDTLS_MPI_MOD_EXT_REP_LE:0:0
+
+Test mbedtls_mpi_mod_raw_io #3 BE (Buffer just fits, extra limbs, input limb-aligned)
+mbedtls_mpi_mod_raw_io:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":96:14:MBEDTLS_MPI_MOD_EXT_REP_BE:0:0
+
+Test mbedtls_mpi_mod_raw_io #3 LE (Buffer just fits, extra limbs, input limb-aligned)
+mbedtls_mpi_mod_raw_io:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":96:14:MBEDTLS_MPI_MOD_EXT_REP_LE:0:0
+
+Test mbedtls_mpi_mod_raw_io #4 BE (Buffer just fits, extra limbs, input unaligned)
+mbedtls_mpi_mod_raw_io:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b":94:14:MBEDTLS_MPI_MOD_EXT_REP_BE:0:0
+
+Test mbedtls_mpi_mod_raw_io #4 LE (Buffer just fits, extra limbs, input unaligned)
+mbedtls_mpi_mod_raw_io:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b":94:14:MBEDTLS_MPI_MOD_EXT_REP_LE:0:0
+
+Test mbedtls_mpi_mod_raw_io #5 BE (Extra limbs, buffer aligned to extra limbs, input limb-aligned)
+mbedtls_mpi_mod_raw_io:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":112:14:MBEDTLS_MPI_MOD_EXT_REP_BE:0:0
+
+Test mbedtls_mpi_mod_raw_io #5 LE (Extra limbs, buffer aligned to extra limbs, input limb-aligned)
+mbedtls_mpi_mod_raw_io:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":112:14:MBEDTLS_MPI_MOD_EXT_REP_LE:0:0
+
+Test mbedtls_mpi_mod_raw_io #6 BE (Extra limbs, buffer aligned to extra limbs, input unaligned)
+mbedtls_mpi_mod_raw_io:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b":112:14:MBEDTLS_MPI_MOD_EXT_REP_BE:0:0
+
+Test mbedtls_mpi_mod_raw_io #6 LE (Extra limbs, buffer aligned to extra limbs, input unaligned)
+mbedtls_mpi_mod_raw_io:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b":112:14:MBEDTLS_MPI_MOD_EXT_REP_LE:0:0
+
+Test mbedtls_mpi_mod_raw_io #7 BE (Buffer and limbs just fit, input limb-aligned with leading zeroes)
+mbedtls_mpi_mod_raw_io:"00000000000000001fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":88:12:MBEDTLS_MPI_MOD_EXT_REP_BE:0:0
+
+Test mbedtls_mpi_mod_raw_io #7 LE (Buffer and limbs just fit, input limb-aligned with leading zeroes)
+mbedtls_mpi_mod_raw_io:"1fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b44240000000000000000":88:12:MBEDTLS_MPI_MOD_EXT_REP_LE:0:0
+
+Test mbedtls_mpi_mod_raw_io #8 BE (Buffer and limbs just fit, input unaligned with leading zeroes)
+mbedtls_mpi_mod_raw_io:"00000000000000001fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b":86:12:MBEDTLS_MPI_MOD_EXT_REP_BE:0:0
+
+Test mbedtls_mpi_mod_raw_io #8 LE (Buffer and limbs just fit, input unaligned with leading zeroes)
+mbedtls_mpi_mod_raw_io:"1fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b0000000000000000":86:12:MBEDTLS_MPI_MOD_EXT_REP_LE:0:0
+
+Test mbedtls_mpi_mod_raw_io #9 BE (Buffer just fits, extra limbs, input limb-aligned with leading zeroes)
+mbedtls_mpi_mod_raw_io:"00000000000000001fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":88:14:MBEDTLS_MPI_MOD_EXT_REP_BE:0:0
+
+Test mbedtls_mpi_mod_raw_io #9 LE (Buffer just fits, extra limbs, input limb-aligned with leading zeroes)
+mbedtls_mpi_mod_raw_io:"1fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b44240000000000000000":88:14:MBEDTLS_MPI_MOD_EXT_REP_LE:0:0
+
+Test mbedtls_mpi_mod_raw_io #10 BE (Buffer just fits, extra limbs, input unaligned with leading zeroes)
+mbedtls_mpi_mod_raw_io:"00000000000000001fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b":86:14:MBEDTLS_MPI_MOD_EXT_REP_BE:0:0
+
+Test mbedtls_mpi_mod_raw_io #10 LE (Buffer just fits, extra limbs, input unaligned with leading zeroes)
+mbedtls_mpi_mod_raw_io:"1fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b0000000000000000":86:14:MBEDTLS_MPI_MOD_EXT_REP_LE:0:0
+
+Test mbedtls_mpi_mod_raw_io #11 BE (Zero)
+mbedtls_mpi_mod_raw_io:"00":1:1:MBEDTLS_MPI_MOD_EXT_REP_BE:0:0
+
+Test mbedtls_mpi_mod_raw_io #11 LE (Zero)
+mbedtls_mpi_mod_raw_io:"00":1:1:MBEDTLS_MPI_MOD_EXT_REP_LE:0:0
+
+Test mbedtls_mpi_mod_raw_io #12 BE (Zero, empty output)
+mbedtls_mpi_mod_raw_io:"00":0:1:MBEDTLS_MPI_MOD_EXT_REP_BE:0:0
+
+Test mbedtls_mpi_mod_raw_io #12 LE (Zero, empty output)
+mbedtls_mpi_mod_raw_io:"00":0:1:MBEDTLS_MPI_MOD_EXT_REP_LE:0:0
+
+Test mbedtls_mpi_mod_raw_io #13 BE (Zero, empty input)
+mbedtls_mpi_mod_raw_io:"":1:1:MBEDTLS_MPI_MOD_EXT_REP_BE:0:0
+
+Test mbedtls_mpi_mod_raw_io #13 LE (Zero, empty input)
+mbedtls_mpi_mod_raw_io:"":1:1:MBEDTLS_MPI_MOD_EXT_REP_LE:0:0
+
+Test mbedtls_mpi_mod_raw_io #14 BE (One)
+mbedtls_mpi_mod_raw_io:"01":1:1:MBEDTLS_MPI_MOD_EXT_REP_BE:0:0
+
+Test mbedtls_mpi_mod_raw_io #14 LE (One)
+mbedtls_mpi_mod_raw_io:"01":1:1:MBEDTLS_MPI_MOD_EXT_REP_LE:0:0
+
+Test mbedtls_mpi_mod_raw_io #14 BE (One limb)
+mbedtls_mpi_mod_raw_io:"ff00000000000000":8:1:MBEDTLS_MPI_MOD_EXT_REP_BE:0:0
+
+Test mbedtls_mpi_mod_raw_io #14 LE (One limb)
+mbedtls_mpi_mod_raw_io:"00000000000000ff":8:1:MBEDTLS_MPI_MOD_EXT_REP_LE:0:0
+
+Test mbedtls_mpi_mod_raw_io #15 BE (not enough limbs, input limb-aligned)
+mbedtls_mpi_mod_raw_io:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":96:11:MBEDTLS_MPI_MOD_EXT_REP_BE:MBEDTLS_ERR_MPI_BUFFER_TOO_SMALL:0
+
+Test mbedtls_mpi_mod_raw_io #15 LE (not enough limbs, input limb-aligned)
+mbedtls_mpi_mod_raw_io:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":96:11:MBEDTLS_MPI_MOD_EXT_REP_LE:MBEDTLS_ERR_MPI_BUFFER_TOO_SMALL:0
+
+Test mbedtls_mpi_mod_raw_io #16 BE (not enough limbs, input unaligned)
+mbedtls_mpi_mod_raw_io:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b":94:11:MBEDTLS_MPI_MOD_EXT_REP_BE:MBEDTLS_ERR_MPI_BUFFER_TOO_SMALL:0
+
+Test mbedtls_mpi_mod_raw_io #16 LE (not enough limbs, input unaligned)
+mbedtls_mpi_mod_raw_io:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b":94:11:MBEDTLS_MPI_MOD_EXT_REP_LE:MBEDTLS_ERR_MPI_BUFFER_TOO_SMALL:0
+
+Test mbedtls_mpi_mod_raw_io #17 BE (buffer too small, input limb-aligned)
+mbedtls_mpi_mod_raw_io:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":95:12:MBEDTLS_MPI_MOD_EXT_REP_BE:0:MBEDTLS_ERR_MPI_BUFFER_TOO_SMALL
+
+Test mbedtls_mpi_mod_raw_io #17 LE (buffer too small, input limb-aligned)
+mbedtls_mpi_mod_raw_io:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":95:12:MBEDTLS_MPI_MOD_EXT_REP_LE:0:MBEDTLS_ERR_MPI_BUFFER_TOO_SMALL
+
+Test mbedtls_mpi_mod_raw_io #18 BE (buffer too small, input unaligned)
+mbedtls_mpi_mod_raw_io:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b":93:12:MBEDTLS_MPI_MOD_EXT_REP_BE:0:MBEDTLS_ERR_MPI_BUFFER_TOO_SMALL
+
+Test mbedtls_mpi_mod_raw_io #18 LE (buffer too small, input unaligned)
+mbedtls_mpi_mod_raw_io:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b":93:12:MBEDTLS_MPI_MOD_EXT_REP_LE:0:MBEDTLS_ERR_MPI_BUFFER_TOO_SMALL
+
+Test mbedtls_mpi_mod_raw_io #19 BE (modulus is equal to input)
+mbedtls_mpi_mod_raw_io:"FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF":1024:128:MBEDTLS_MPI_MOD_EXT_REP_BE:MBEDTLS_ERR_MPI_BAD_INPUT_DATA:0
+
+Test mbedtls_mpi_mod_raw_io #19 LE (modulus is equal to input)
+mbedtls_mpi_mod_raw_io:"FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF":1024:128:MBEDTLS_MPI_MOD_EXT_REP_LE:MBEDTLS_ERR_MPI_BAD_INPUT_DATA:0
+
+Test mbedtls_mpi_mod_raw_io #20 (reading with invalid endianness)
+mbedtls_mpi_mod_raw_io:"":1:1:MBEDTLS_MPI_MOD_EXT_REP_INVALID:MBEDTLS_ERR_MPI_BAD_INPUT_DATA:0
+
+Test mbedtls_mpi_mod_raw_io #20 (writing with invalid endianness)
+mbedtls_mpi_mod_raw_io:"":1:1:MBEDTLS_MPI_MOD_EXT_REP_INVALID:0:MBEDTLS_ERR_MPI_BAD_INPUT_DATA
+
 Base test mbedtls_mpi_read_binary #1
 mbedtls_mpi_read_binary:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":"0941379D00FED1491FE15DF284DFDE4A142F68AA8D412023195CEE66883E6290FFE703F4EA5963BF212713CEE46B107C09182B5EDCD955ADAC418BF4918E2889AF48E1099D513830CEC85C26AC1E158B52620E33BA8692F893EFBB2F958B4424"
 
diff --git a/tests/suites/test_suite_mpi.function b/tests/suites/test_suite_mpi.function
index ff87ea4..de66fdd 100644
--- a/tests/suites/test_suite_mpi.function
+++ b/tests/suites/test_suite_mpi.function
@@ -2,6 +2,8 @@
 #include "mbedtls/bignum.h"
 #include "mbedtls/entropy.h"
 #include "bignum_core.h"
+#include "bignum_mod.h"
+#include "bignum_mod_raw.h"
 #include "constant_time_internal.h"
 #include "test/constant_flow.h"
 
@@ -351,6 +353,106 @@
 /* END_CASE */
 
 /* BEGIN_CASE */
+void mbedtls_mpi_mod_raw_io( data_t *input, int nb_int, int nx_64_int,
+                             int iendian, int iret, int oret )
+{
+    #define BMAX 1024
+    unsigned char buf[BMAX];
+    #define XMAX BMAX / sizeof( mbedtls_mpi_uint )
+    mbedtls_mpi_uint X[XMAX];
+    mbedtls_mpi_uint init[XMAX];
+    mbedtls_mpi_mod_modulus m;
+    size_t nx, nb;
+    int ret;
+    int endian;
+
+    if( iret != 0 )
+        TEST_ASSERT( oret == 0 );
+
+    TEST_ASSERT( 0 <= nb_int );
+    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( nx <= XMAX );
+
+    if( iendian == MBEDTLS_MPI_MOD_EXT_REP_INVALID )
+        endian = MBEDTLS_MPI_MOD_EXT_REP_LE;
+    else
+        endian = iendian;
+
+    mbedtls_mpi_mod_modulus_init( &m );
+    TEST_ASSERT( memset( init, 0xFF, sizeof( init ) ) );
+
+    ret = mbedtls_mpi_mod_modulus_setup( &m, init, nx, endian,
+                                         MBEDTLS_MPI_MOD_REP_MONTGOMERY );
+    TEST_ASSERT( ret == 0 );
+
+    if( iendian == MBEDTLS_MPI_MOD_EXT_REP_INVALID && iret != 0 )
+        m.ext_rep = MBEDTLS_MPI_MOD_EXT_REP_INVALID;
+
+    ret = mbedtls_mpi_mod_raw_read( X, &m, input->x, input->len );
+    TEST_ASSERT( ret == iret );
+
+    if( iret == 0 )
+    {
+        if( iendian == MBEDTLS_MPI_MOD_EXT_REP_INVALID && oret != 0 )
+            m.ext_rep = MBEDTLS_MPI_MOD_EXT_REP_INVALID;
+
+        ret = mbedtls_mpi_mod_raw_write( X, &m, buf, nb );
+        TEST_ASSERT( ret == oret );
+    }
+
+    if( ( iret == 0 ) && ( oret == 0 ) )
+    {
+        if( nb > input->len )
+        {
+            if( endian == MBEDTLS_MPI_MOD_EXT_REP_BE )
+            {
+                size_t leading_zeroes = nb - input->len;
+                TEST_ASSERT( memcmp( buf + nb - input->len, input->x, input->len ) == 0 );
+                for( size_t i = 0; i < leading_zeroes; i++ )
+                    TEST_ASSERT( buf[i] == 0 );
+            }
+            else
+            {
+                TEST_ASSERT( memcmp( buf, input->x, input->len ) == 0 );
+                for( size_t i = input->len; i < nb; i++ )
+                    TEST_ASSERT( buf[i] == 0 );
+            }
+        }
+        else
+        {
+            if( endian == MBEDTLS_MPI_MOD_EXT_REP_BE )
+            {
+                size_t leading_zeroes = input->len - nb;
+                TEST_ASSERT( memcmp( input->x + input->len - nb, buf, nb ) == 0 );
+                for( size_t i = 0; i < leading_zeroes; i++ )
+                    TEST_ASSERT( input->x[i] == 0 );
+            }
+            else
+            {
+                TEST_ASSERT( memcmp( input->x, buf, nb ) == 0 );
+                for( size_t i = nb; i < input->len; i++ )
+                    TEST_ASSERT( input->x[i] == 0 );
+            }
+        }
+    }
+
+exit:
+    mbedtls_mpi_mod_modulus_free( &m );
+
+    #undef BMAX
+    #undef XMAX
+}
+/* END_CASE */
+
+/* BEGIN_CASE */
 void mbedtls_mpi_read_binary_le( data_t * buf, char * input_A )
 {
     mbedtls_mpi X;