diff --git a/tests/suites/test_suite_mpi.data b/tests/suites/test_suite_mpi.data
index 7968501136..2f8cab2a7b 100644
--- a/tests/suites/test_suite_mpi.data
+++ b/tests/suites/test_suite_mpi.data
@@ -310,44 +310,131 @@ mbedtls_mpi_cmp_abs:10:"2":10:"-3":-1
 Base test mbedtls_mpi_cmp_abs (Mix values) #3
 mbedtls_mpi_cmp_abs:10:"-2":10:"1":1
 
-Copy zero (1 limb) to positive (1 limb)
-mbedtls_mpi_copy_sint:0:1500
+Copy large negative to large negative
+mbedtls_mpi_copy:"-ca5cadedb01dfaceacc01ade":"-face1e55ca11ab1ecab005e5"
 
-Copy zero (1 limb) to negative (1 limb)
-mbedtls_mpi_copy_sint:0:-1500
+Copy large negative to large positive
+mbedtls_mpi_copy:"-ca5cadedb01dfaceacc01ade":"face1e55ca11ab1ecab005e5"
 
-Copy positive (1 limb) to zero (1 limb)
-mbedtls_mpi_copy_sint:1500:0
+Copy large negative to small negative
+mbedtls_mpi_copy:"-ca5cadedb01dfaceacc01ade":"-beef"
 
-Copy negative (1 limb) to zero (1 limb)
-mbedtls_mpi_copy_sint:-1500:0
+Copy large negative to small positive
+mbedtls_mpi_copy:"-ca5cadedb01dfaceacc01ade":"beef"
 
-Copy positive (1 limb) to negative (1 limb)
-mbedtls_mpi_copy_sint:1500:-42
+Copy large negative to zero (1 limb)
+mbedtls_mpi_copy:"-ca5cadedb01dfaceacc01ade":"0"
 
-Copy negative (1 limb) to positive (1 limb)
-mbedtls_mpi_copy_sint:-42:1500
+Copy large negative to zero (null)
+mbedtls_mpi_copy:"-ca5cadedb01dfaceacc01ade":""
+
+Copy large positive to large negative
+mbedtls_mpi_copy:"ca5cadedb01dfaceacc01ade":"-face1e55ca11ab1ecab005e5"
+
+Copy large positive to large positive
+mbedtls_mpi_copy:"ca5cadedb01dfaceacc01ade":"face1e55ca11ab1ecab005e5"
+
+Copy large positive to small negative
+mbedtls_mpi_copy:"ca5cadedb01dfaceacc01ade":"-beef"
+
+Copy large positive to small positive
+mbedtls_mpi_copy:"ca5cadedb01dfaceacc01ade":"beef"
+
+Copy large positive to zero (1 limb)
+mbedtls_mpi_copy:"ca5cadedb01dfaceacc01ade":"0"
+
+Copy large positive to zero (null)
+mbedtls_mpi_copy:"ca5cadedb01dfaceacc01ade":""
+
+Copy small negative to large negative
+mbedtls_mpi_copy:"-bead":"-face1e55ca11ab1ecab005e5"
+
+Copy small negative to large positive
+mbedtls_mpi_copy:"-bead":"face1e55ca11ab1ecab005e5"
+
+Copy small negative to small negative
+mbedtls_mpi_copy:"-bead":"-beef"
+
+Copy small negative to small positive
+mbedtls_mpi_copy:"-bead":"beef"
+
+Copy small negative to zero (1 limb)
+mbedtls_mpi_copy:"-bead":"0"
+
+Copy small negative to zero (null)
+mbedtls_mpi_copy:"-bead":""
+
+Copy small positive to large negative
+mbedtls_mpi_copy:"bead":"-face1e55ca11ab1ecab005e5"
+
+Copy small positive to large positive
+mbedtls_mpi_copy:"bead":"face1e55ca11ab1ecab005e5"
+
+Copy small positive to small negative
+mbedtls_mpi_copy:"bead":"-beef"
+
+Copy small positive to small positive
+mbedtls_mpi_copy:"bead":"beef"
+
+Copy small positive to zero (1 limb)
+mbedtls_mpi_copy:"bead":"0"
+
+Copy small positive to zero (null)
+mbedtls_mpi_copy:"bead":""
+
+Copy zero (1 limb) to large negative
+mbedtls_mpi_copy:"0":"-face1e55ca11ab1ecab005e5"
+
+Copy zero (1 limb) to large positive
+mbedtls_mpi_copy:"0":"face1e55ca11ab1ecab005e5"
+
+Copy zero (1 limb) to small negative
+mbedtls_mpi_copy:"0":"-beef"
+
+Copy zero (1 limb) to small positive
+mbedtls_mpi_copy:"0":"beef"
+
+Copy zero (1 limb) to zero (1 limb)
+mbedtls_mpi_copy:"0":"0"
+
+Copy zero (1 limb) to zero (null)
+mbedtls_mpi_copy:"0":""
+
+Copy zero (null) to large negative
+mbedtls_mpi_copy:"":"-face1e55ca11ab1ecab005e5"
+
+Copy zero (null) to large positive
+mbedtls_mpi_copy:"":"face1e55ca11ab1ecab005e5"
+
+Copy zero (null) to small negative
+mbedtls_mpi_copy:"":"-beef"
+
+Copy zero (null) to small positive
+mbedtls_mpi_copy:"":"beef"
+
+Copy zero (null) to zero (1 limb)
+mbedtls_mpi_copy:"":"0"
 
 Copy zero (null) to zero (null)
-mbedtls_mpi_copy_binary:"":""
+mbedtls_mpi_copy:"":""
 
-Copy zero (null) to positive (1 limb)
-mbedtls_mpi_copy_binary:"":"1234"
+Copy self: large negative
+mpi_copy_self:"-ca5cadedb01dfaceacc01ade"
 
-Copy positive (1 limb) to zero (null)
-mbedtls_mpi_copy_binary:"1234":""
+Copy self: large positive
+mpi_copy_self:"ca5cadedb01dfaceacc01ade"
 
-Copy positive to larger
-mbedtls_mpi_copy_binary:"bead":"ca5cadedb01dfaceacc01ade"
+Copy self: small negative
+mpi_copy_self:"-bead"
 
-Copy positive to smaller
-mbedtls_mpi_copy_binary:"ca5cadedb01dfaceacc01ade":"bead"
-
-Copy self: positive (1 limb)
-mpi_copy_self:14
+Copy self: small positive
+mpi_copy_self:"bead"
 
 Copy self: zero (1 limb)
-mpi_copy_self:0
+mpi_copy_self:"0"
+
+Copy self: zero (null)
+mpi_copy_self:""
 
 Swap zero (1 limb) with positive (1 limb)
 mbedtls_mpi_swap_sint:0:1500
diff --git a/tests/suites/test_suite_mpi.function b/tests/suites/test_suite_mpi.function
index d45d3dcf81..42dbafa2d7 100644
--- a/tests/suites/test_suite_mpi.function
+++ b/tests/suites/test_suite_mpi.function
@@ -501,56 +501,42 @@ exit:
 /* END_CASE */
 
 /* BEGIN_CASE */
-void mbedtls_mpi_copy_sint( int input_X, int input_Y )
+void mbedtls_mpi_copy( char *src_hex, char *dst_hex )
 {
-    mbedtls_mpi X, Y;
-    mbedtls_mpi_init( &X ); mbedtls_mpi_init( &Y );
+    mbedtls_mpi src, dst;
+    mbedtls_mpi_init( &src );
+    mbedtls_mpi_init( &dst );
 
-    TEST_ASSERT( mbedtls_mpi_lset( &X, input_X ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_lset( &Y, input_Y ) == 0 );
+    TEST_ASSERT( mbedtls_test_read_mpi( &src, 16, src_hex ) == 0 );
+    TEST_ASSERT( mbedtls_test_read_mpi( &dst, 16, dst_hex ) == 0 );
 
-    TEST_ASSERT( mbedtls_mpi_copy( &Y, &X ) == 0 );
-    TEST_ASSERT( sign_is_valid( &Y ) );
-    TEST_ASSERT( mbedtls_mpi_cmp_int( &X, input_X ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_cmp_int( &Y, input_X ) == 0 );
+    TEST_ASSERT( mbedtls_mpi_copy( &dst, &src ) == 0 );
+
+    TEST_ASSERT( sign_is_valid( &dst ) );
+    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &dst, &src ) == 0 );
 
 exit:
-    mbedtls_mpi_free( &X ); mbedtls_mpi_free( &Y );
+    mbedtls_mpi_free( &src );
+    mbedtls_mpi_free( &dst );
 }
 /* END_CASE */
 
 /* BEGIN_CASE */
-void mbedtls_mpi_copy_binary( data_t *input_X, data_t *input_Y )
+void mpi_copy_self( char *input_X )
 {
-    mbedtls_mpi X, Y, X0;
-    mbedtls_mpi_init( &X ); mbedtls_mpi_init( &Y ); mbedtls_mpi_init( &X0 );
-
-    TEST_ASSERT( mbedtls_mpi_read_binary( &X, input_X->x, input_X->len ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_read_binary( &Y, input_Y->x, input_Y->len ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_read_binary( &X0, input_X->x, input_X->len ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &X, &X0 ) == 0 );
-
-    TEST_ASSERT( mbedtls_mpi_copy( &Y, &X ) == 0 );
-    TEST_ASSERT( sign_is_valid( &Y ) );
-    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &X, &X0 ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &Y, &X0 ) == 0 );
-
-exit:
-    mbedtls_mpi_free( &X ); mbedtls_mpi_free( &Y ); mbedtls_mpi_free( &X0 );
-}
-/* END_CASE */
-
-/* BEGIN_CASE */
-void mpi_copy_self( int input_X )
-{
-    mbedtls_mpi X;
+    mbedtls_mpi X, A;
+    mbedtls_mpi_init( &A );
     mbedtls_mpi_init( &X );
 
-    TEST_ASSERT( mbedtls_mpi_lset( &X, input_X ) == 0 );
+    TEST_ASSERT( mbedtls_test_read_mpi( &X, 16, input_X ) == 0 );
     TEST_ASSERT( mbedtls_mpi_copy( &X, &X ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_cmp_int( &X, input_X ) == 0 );
+
+    TEST_ASSERT( mbedtls_test_read_mpi( &A, 16, input_X ) == 0 );
+    TEST_ASSERT( sign_is_valid( &X ) );
+    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &X, &A ) == 0 );
 
 exit:
+    mbedtls_mpi_free( &A );
     mbedtls_mpi_free( &X );
 }
 /* END_CASE */