Combine hex parameters in a struct
diff --git a/tests/suites/test_suite_hmac_drbg.function b/tests/suites/test_suite_hmac_drbg.function
index cf1f368..aeea62c 100644
--- a/tests/suites/test_suite_hmac_drbg.function
+++ b/tests/suites/test_suite_hmac_drbg.function
@@ -161,12 +161,9 @@
 /* END_CASE */
 
 /* BEGIN_CASE */
-void hmac_drbg_no_reseed( int md_alg, uint8_t * entropy,
-                          uint32_t entropy_len, uint8_t * custom,
-                          uint32_t custom_len, uint8_t * add1,
-                          uint32_t add1_len, uint8_t * add2,
-                          uint32_t add2_len, uint8_t * output,
-                          uint32_t out_len )
+void hmac_drbg_no_reseed( int md_alg, HexParam_t * entropy,
+                          HexParam_t * custom, HexParam_t * add1,
+                          HexParam_t * add2, HexParam_t * output )
 {
     unsigned char data[1024];
     unsigned char my_output[512];
@@ -176,35 +173,35 @@
 
     mbedtls_hmac_drbg_init( &ctx );
 
-    p_entropy.p = entropy;
-    p_entropy.len = entropy_len;
+    p_entropy.p = entropy->x;
+    p_entropy.len = entropy->len;
 
     md_info = mbedtls_md_info_from_type( md_alg );
     TEST_ASSERT( md_info != NULL );
 
     /* Test the simplified buffer-based variant */
-    memcpy( data, entropy, p_entropy.len );
-    memcpy( data + p_entropy.len, custom, custom_len );
+    memcpy( data, entropy->x, p_entropy.len );
+    memcpy( data + p_entropy.len, custom->x, custom->len );
     TEST_ASSERT( mbedtls_hmac_drbg_seed_buf( &ctx, md_info,
-                                     data, p_entropy.len + custom_len ) == 0 );
-    TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, out_len,
-                                            add1, add1_len ) == 0 );
-    TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, out_len,
-                                            add2, add2_len ) == 0 );
+                                     data, p_entropy.len + custom->len ) == 0 );
+    TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, output->len,
+                                            add1->x, add1->len ) == 0 );
+    TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, output->len,
+                                            add2->x, add2->len ) == 0 );
 
     /* clear for second run */
     mbedtls_hmac_drbg_free( &ctx );
 
-    TEST_ASSERT( memcmp( my_output, output, out_len ) == 0 );
+    TEST_ASSERT( memcmp( my_output, output->x, output->len ) == 0 );
 
     /* And now the normal entropy-based variant */
     TEST_ASSERT( mbedtls_hmac_drbg_seed( &ctx, md_info, mbedtls_test_entropy_func, &p_entropy,
-                                 custom, custom_len ) == 0 );
-    TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, out_len,
-                                            add1, add1_len ) == 0 );
-    TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, out_len,
-                                            add2, add2_len ) == 0 );
-    TEST_ASSERT( memcmp( my_output, output, out_len ) == 0 );
+                                 custom->x, custom->len ) == 0 );
+    TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, output->len,
+                                            add1->x, add1->len ) == 0 );
+    TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, output->len,
+                                            add2->x, add2->len ) == 0 );
+    TEST_ASSERT( memcmp( my_output, output->x, output->len ) == 0 );
 
 exit:
     mbedtls_hmac_drbg_free( &ctx );
@@ -212,11 +209,9 @@
 /* END_CASE */
 
 /* BEGIN_CASE */
-void hmac_drbg_nopr( int md_alg, uint8_t * entropy, uint32_t entropy_len,
-                     uint8_t * custom, uint32_t custom_len, uint8_t * add1,
-                     uint32_t add1_len, uint8_t * add2, uint32_t add2_len,
-                     uint8_t * add3, uint32_t add3_len, uint8_t * output,
-                     uint32_t out_len )
+void hmac_drbg_nopr( int md_alg, HexParam_t * entropy, HexParam_t * custom,
+                     HexParam_t * add1, HexParam_t * add2, HexParam_t * add3,
+                     HexParam_t * output )
 {
     unsigned char my_output[512];
     entropy_ctx p_entropy;
@@ -225,21 +220,21 @@
 
     mbedtls_hmac_drbg_init( &ctx );
 
-    p_entropy.p = entropy;
-    p_entropy.len = entropy_len;
+    p_entropy.p = entropy->x;
+    p_entropy.len = entropy->len;
 
     md_info = mbedtls_md_info_from_type( md_alg );
     TEST_ASSERT( md_info != NULL );
 
     TEST_ASSERT( mbedtls_hmac_drbg_seed( &ctx, md_info, mbedtls_test_entropy_func, &p_entropy,
-                                 custom, custom_len ) == 0 );
-    TEST_ASSERT( mbedtls_hmac_drbg_reseed( &ctx, add1, add1_len ) == 0 );
-    TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, out_len,
-                                            add2, add2_len ) == 0 );
-    TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, out_len,
-                                            add3, add3_len ) == 0 );
+                                 custom->x, custom->len ) == 0 );
+    TEST_ASSERT( mbedtls_hmac_drbg_reseed( &ctx, add1->x, add1->len ) == 0 );
+    TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, output->len,
+                                            add2->x, add2->len ) == 0 );
+    TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, output->len,
+                                            add3->x, add3->len ) == 0 );
 
-    TEST_ASSERT( memcmp( my_output, output, out_len ) == 0 );
+    TEST_ASSERT( memcmp( my_output, output->x, output->len ) == 0 );
 
 exit:
     mbedtls_hmac_drbg_free( &ctx );
@@ -247,10 +242,8 @@
 /* END_CASE */
 
 /* BEGIN_CASE */
-void hmac_drbg_pr( int md_alg, uint8_t * entropy, uint32_t entropy_len,
-                   uint8_t * custom, uint32_t custom_len, uint8_t * add1,
-                   uint32_t add1_len, uint8_t * add2, uint32_t add2_len,
-                   uint8_t * output, uint32_t out_len )
+void hmac_drbg_pr( int md_alg, HexParam_t * entropy, HexParam_t * custom,
+                   HexParam_t * add1, HexParam_t * add2, HexParam_t * output )
 {
     unsigned char my_output[512];
     entropy_ctx p_entropy;
@@ -259,21 +252,21 @@
 
     mbedtls_hmac_drbg_init( &ctx );
 
-    p_entropy.p = entropy;
-    p_entropy.len = entropy_len;
+    p_entropy.p = entropy->x;
+    p_entropy.len = entropy->len;
 
     md_info = mbedtls_md_info_from_type( md_alg );
     TEST_ASSERT( md_info != NULL );
 
     TEST_ASSERT( mbedtls_hmac_drbg_seed( &ctx, md_info, mbedtls_test_entropy_func, &p_entropy,
-                                 custom, custom_len ) == 0 );
+                                 custom->x, custom->len ) == 0 );
     mbedtls_hmac_drbg_set_prediction_resistance( &ctx, MBEDTLS_HMAC_DRBG_PR_ON );
-    TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, out_len,
-                                            add1, add1_len ) == 0 );
-    TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, out_len,
-                                            add2, add2_len ) == 0 );
+    TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, output->len,
+                                            add1->x, add1->len ) == 0 );
+    TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, output->len,
+                                            add2->x, add2->len ) == 0 );
 
-    TEST_ASSERT( memcmp( my_output, output, out_len ) == 0 );
+    TEST_ASSERT( memcmp( my_output, output->x, output->len ) == 0 );
 
 exit:
     mbedtls_hmac_drbg_free( &ctx );