diff --git a/tests/suites/test_suite_pkcs1_v15.function b/tests/suites/test_suite_pkcs1_v15.function
index 09fe05b..1a06e4f 100644
--- a/tests/suites/test_suite_pkcs1_v15.function
+++ b/tests/suites/test_suite_pkcs1_v15.function
@@ -21,19 +21,21 @@
     mbedtls_rsa_context ctx;
     size_t msg_len;
     rnd_buf_info info;
+    mbedtls_mpi N, E;
 
     info.length = unhexify( rnd_buf, seed );
     info.buf = rnd_buf;
 
+    mbedtls_mpi_init( &N ); mbedtls_mpi_init( &E );
     mbedtls_rsa_init( &ctx, MBEDTLS_RSA_PKCS_V15, hash );
     memset( message_str, 0x00, 1000 );
     memset( output, 0x00, 1000 );
     memset( output_str, 0x00, 1000 );
 
-    ctx.len = mod / 8 + ( ( mod % 8 ) ? 1 : 0 );
-    TEST_ASSERT( mbedtls_mpi_read_string( &ctx.N, radix_N, input_N ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_read_string( &ctx.E, radix_E, input_E ) == 0 );
-
+    TEST_ASSERT( mbedtls_mpi_read_string( &N, radix_N, input_N ) == 0 );
+    TEST_ASSERT( mbedtls_mpi_read_string( &E, radix_E, input_E ) == 0 );
+    TEST_ASSERT( mbedtls_rsa_import( &ctx, &N, NULL, NULL, NULL, &E ) == 0 );
+    TEST_ASSERT( mbedtls_rsa_get_len( &ctx ) == (size_t) ( ( mod + 7 ) / 8 ) );
     TEST_ASSERT( mbedtls_rsa_check_pubkey( &ctx ) == 0 );
 
     msg_len = unhexify( message_str, message_hex_string );
@@ -47,6 +49,7 @@
     }
 
 exit:
+    mbedtls_mpi_free( &N ); mbedtls_mpi_free( &E );
     mbedtls_rsa_free( &ctx );
 }
 /* END_CASE */
@@ -62,12 +65,13 @@
     unsigned char output[1000];
     unsigned char output_str[1000];
     mbedtls_rsa_context ctx;
-    mbedtls_mpi P1, Q1, H, G;
     size_t output_len;
     rnd_pseudo_info rnd_info;
+    mbedtls_mpi N, P, Q, E;
     ((void) seed);
 
-    mbedtls_mpi_init( &P1 ); mbedtls_mpi_init( &Q1 ); mbedtls_mpi_init( &H ); mbedtls_mpi_init( &G );
+    mbedtls_mpi_init( &N ); mbedtls_mpi_init( &P );
+    mbedtls_mpi_init( &Q ); mbedtls_mpi_init( &E );
     mbedtls_rsa_init( &ctx, MBEDTLS_RSA_PKCS_V15, hash );
 
     memset( message_str, 0x00, 1000 );
@@ -75,21 +79,14 @@
     memset( output_str, 0x00, 1000 );
     memset( &rnd_info, 0, sizeof( rnd_pseudo_info ) );
 
-    ctx.len = mod / 8 + ( ( mod % 8 ) ? 1 : 0 );
-    TEST_ASSERT( mbedtls_mpi_read_string( &ctx.P, radix_P, input_P ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_read_string( &ctx.Q, radix_Q, input_Q ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_read_string( &ctx.N, radix_N, input_N ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_read_string( &ctx.E, radix_E, input_E ) == 0 );
+    TEST_ASSERT( mbedtls_mpi_read_string( &P, radix_P, input_P ) == 0 );
+    TEST_ASSERT( mbedtls_mpi_read_string( &Q, radix_Q, input_Q ) == 0 );
+    TEST_ASSERT( mbedtls_mpi_read_string( &N, radix_N, input_N ) == 0 );
+    TEST_ASSERT( mbedtls_mpi_read_string( &E, radix_E, input_E ) == 0 );
 
-    TEST_ASSERT( mbedtls_mpi_sub_int( &P1, &ctx.P, 1 ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_sub_int( &Q1, &ctx.Q, 1 ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_mul_mpi( &H, &P1, &Q1 ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_gcd( &G, &ctx.E, &H  ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_inv_mod( &ctx.D , &ctx.E, &H  ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_mod_mpi( &ctx.DP, &ctx.D, &P1 ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_mod_mpi( &ctx.DQ, &ctx.D, &Q1 ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_inv_mod( &ctx.QP, &ctx.Q, &ctx.P ) == 0 );
-
+    TEST_ASSERT( mbedtls_rsa_import( &ctx, &N, &P, &Q, NULL, &E ) == 0 );
+    TEST_ASSERT( mbedtls_rsa_get_len( &ctx ) == (size_t) ( ( mod + 7 ) / 8 ) );
+    TEST_ASSERT( mbedtls_rsa_complete( &ctx, NULL, NULL ) == 0 );
     TEST_ASSERT( mbedtls_rsa_check_privkey( &ctx ) == 0 );
 
     unhexify( message_str, message_hex_string );
@@ -103,7 +100,8 @@
     }
 
 exit:
-    mbedtls_mpi_free( &P1 ); mbedtls_mpi_free( &Q1 ); mbedtls_mpi_free( &H ); mbedtls_mpi_free( &G );
+    mbedtls_mpi_free( &N ); mbedtls_mpi_free( &P );
+    mbedtls_mpi_free( &Q ); mbedtls_mpi_free( &E );
     mbedtls_rsa_free( &ctx );
 }
 /* END_CASE */
@@ -121,14 +119,15 @@
     unsigned char output_str[1000];
     unsigned char rnd_buf[1000];
     mbedtls_rsa_context ctx;
-    mbedtls_mpi P1, Q1, H, G;
+    mbedtls_mpi N, P, Q, E;
     size_t msg_len;
     rnd_buf_info info;
 
     info.length = unhexify( rnd_buf, salt );
     info.buf = rnd_buf;
 
-    mbedtls_mpi_init( &P1 ); mbedtls_mpi_init( &Q1 ); mbedtls_mpi_init( &H ); mbedtls_mpi_init( &G );
+    mbedtls_mpi_init( &N ); mbedtls_mpi_init( &P );
+    mbedtls_mpi_init( &Q ); mbedtls_mpi_init( &E );
     mbedtls_rsa_init( &ctx, MBEDTLS_RSA_PKCS_V15, hash );
 
     memset( message_str, 0x00, 1000 );
@@ -136,21 +135,14 @@
     memset( output, 0x00, 1000 );
     memset( output_str, 0x00, 1000 );
 
-    ctx.len = mod / 8 + ( ( mod % 8 ) ? 1 : 0 );
-    TEST_ASSERT( mbedtls_mpi_read_string( &ctx.P, radix_P, input_P ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_read_string( &ctx.Q, radix_Q, input_Q ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_read_string( &ctx.N, radix_N, input_N ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_read_string( &ctx.E, radix_E, input_E ) == 0 );
+    TEST_ASSERT( mbedtls_mpi_read_string( &P, radix_P, input_P ) == 0 );
+    TEST_ASSERT( mbedtls_mpi_read_string( &Q, radix_Q, input_Q ) == 0 );
+    TEST_ASSERT( mbedtls_mpi_read_string( &N, radix_N, input_N ) == 0 );
+    TEST_ASSERT( mbedtls_mpi_read_string( &E, radix_E, input_E ) == 0 );
 
-    TEST_ASSERT( mbedtls_mpi_sub_int( &P1, &ctx.P, 1 ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_sub_int( &Q1, &ctx.Q, 1 ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_mul_mpi( &H, &P1, &Q1 ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_gcd( &G, &ctx.E, &H  ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_inv_mod( &ctx.D , &ctx.E, &H  ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_mod_mpi( &ctx.DP, &ctx.D, &P1 ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_mod_mpi( &ctx.DQ, &ctx.D, &Q1 ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_inv_mod( &ctx.QP, &ctx.Q, &ctx.P ) == 0 );
-
+    TEST_ASSERT( mbedtls_rsa_import( &ctx, &N, &P, &Q, NULL, &E ) == 0 );
+    TEST_ASSERT( mbedtls_rsa_get_len( &ctx ) == (size_t) ( ( mod + 7 ) / 8 ) );
+    TEST_ASSERT( mbedtls_rsa_complete( &ctx, NULL, NULL ) == 0 );
     TEST_ASSERT( mbedtls_rsa_check_privkey( &ctx ) == 0 );
 
     msg_len = unhexify( message_str, message_hex_string );
@@ -167,7 +159,8 @@
     }
 
 exit:
-    mbedtls_mpi_free( &P1 ); mbedtls_mpi_free( &Q1 ); mbedtls_mpi_free( &H ); mbedtls_mpi_free( &G );
+    mbedtls_mpi_free( &N ); mbedtls_mpi_free( &P );
+    mbedtls_mpi_free( &Q ); mbedtls_mpi_free( &E );
     mbedtls_rsa_free( &ctx );
 }
 /* END_CASE */
@@ -183,28 +176,34 @@
     unsigned char result_str[1000];
     mbedtls_rsa_context ctx;
     size_t msg_len;
+    mbedtls_mpi N, E;
     ((void) salt);
 
+    mbedtls_mpi_init( &N ); mbedtls_mpi_init( &E );
     mbedtls_rsa_init( &ctx, MBEDTLS_RSA_PKCS_V15, hash );
     memset( message_str, 0x00, 1000 );
     memset( hash_result, 0x00, 1000 );
     memset( result_str, 0x00, 1000 );
 
-    ctx.len = mod / 8 + ( ( mod % 8 ) ? 1 : 0 );
-    TEST_ASSERT( mbedtls_mpi_read_string( &ctx.N, radix_N, input_N ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_read_string( &ctx.E, radix_E, input_E ) == 0 );
-
+    TEST_ASSERT( mbedtls_mpi_read_string( &N, radix_N, input_N ) == 0 );
+    TEST_ASSERT( mbedtls_mpi_read_string( &E, radix_E, input_E ) == 0 );
+    TEST_ASSERT( mbedtls_rsa_import( &ctx, &N, NULL, NULL, NULL, &E ) == 0 );
+    TEST_ASSERT( mbedtls_rsa_get_len( &ctx ) == (size_t) ( ( mod + 7 ) / 8 ) );
     TEST_ASSERT( mbedtls_rsa_check_pubkey( &ctx ) == 0 );
 
     msg_len = unhexify( message_str, message_hex_string );
     unhexify( result_str, result_hex_str );
 
     if( mbedtls_md_info_from_type( digest ) != NULL )
-        TEST_ASSERT( mbedtls_md( mbedtls_md_info_from_type( digest ), message_str, msg_len, hash_result ) == 0 );
+        TEST_ASSERT( mbedtls_md( mbedtls_md_info_from_type( digest ),
+                                 message_str, msg_len, hash_result ) == 0 );
 
-    TEST_ASSERT( mbedtls_rsa_pkcs1_verify( &ctx, NULL, NULL, MBEDTLS_RSA_PUBLIC, digest, 0, hash_result, result_str ) == result );
+    TEST_ASSERT( mbedtls_rsa_pkcs1_verify( &ctx, NULL, NULL, MBEDTLS_RSA_PUBLIC,
+                                           digest, 0, hash_result,
+                                           result_str ) == result );
 
 exit:
+    mbedtls_mpi_free( &N ); mbedtls_mpi_free( &E );
     mbedtls_rsa_free( &ctx );
 }
 /* END_CASE */