Introduce a new macro for hash size in ecdsa tests

Previously these tests depended on the definition from
inside the MD module, which in turn could be 32 or 64
bytes depending on whether MBEDTLS_SHA512_C was
defined. This is unnecessary, so a constant is itnroduced
instead.
Signed-off-by: Andrzej Kurek <[email protected]>

Author: Andrzej Kurek

tests/suites/test_suite_ecdsa.function

@@ -5,6 +5,7 @@
     ( !defined(MBEDTLS_ECDSA_DETERMINISTIC) && defined(MBEDTLS_HAS_ALG_SHA_256_VIA_LOWLEVEL_OR_PSA) )
 #define MBEDTLS_HAS_ALG_SHA_256_VIA_MD_IF_DETERMINISTIC
 #endif
+#define MBEDTLS_TEST_HASH_MAX_SIZE 64
 /* END_HEADER */
 
 /* BEGIN_DEPENDENCIES
@@ -19,7 +20,7 @@ void ecdsa_prim_zero( int id )
     mbedtls_ecp_point Q;
     mbedtls_mpi d, r, s;
     mbedtls_test_rnd_pseudo_info rnd_info;
-    unsigned char buf[MBEDTLS_MD_MAX_SIZE];
+    unsigned char buf[MBEDTLS_TEST_HASH_MAX_SIZE];
 
     mbedtls_ecp_group_init( &grp );
     mbedtls_ecp_point_init( &Q );
@@ -51,7 +52,7 @@ void ecdsa_prim_random( int id )
     mbedtls_ecp_point Q;
     mbedtls_mpi d, r, s;
     mbedtls_test_rnd_pseudo_info rnd_info;
-    unsigned char buf[MBEDTLS_MD_MAX_SIZE];
+    unsigned char buf[MBEDTLS_TEST_HASH_MAX_SIZE];
 
     mbedtls_ecp_group_init( &grp );
     mbedtls_ecp_point_init( &Q );