diff --git a/tests/suites/test_suite_ecdsa.data b/tests/suites/test_suite_ecdsa.data
index b03549b..dbc9090 100644
--- a/tests/suites/test_suite_ecdsa.data
+++ b/tests/suites/test_suite_ecdsa.data
@@ -250,26 +250,3 @@
 depends_on:POLARSSL_ECP_DP_SECP521R1_ENABLED:POLARSSL_SHA512_C
 ecdsa_det_test_vectors:POLARSSL_ECP_DP_SECP521R1:"0FAD06DAA62BA3B25D2FB40133DA757205DE67F5BB0018FEE8C86E1B68C7E75CAA896EB32F1F47C70855836A6D16FCC1466F6D8FBEC67DB89EC0C08B0E996B83538":POLARSSL_MD_SHA512:"test":"13E99020ABF5CEE7525D16B69B229652AB6BDF2AFFCAEF38773B4B7D08725F10CDB93482FDCC54EDCEE91ECA4166B2A7C6265EF0CE2BD7051B7CEF945BABD47EE6D":"1FBD0013C674AA79CB39849527916CE301C66EA7CE8B80682786AD60F98F7E78A19CA69EFF5C57400E3B3A0AD66CE0978214D13BAF4E9AC60752F7B155E2DE4DCE3"
 
-ECDSA deterministic read-write random p256 sha256
-depends_on:POLARSSL_ECP_DP_SECP256R1_ENABLED:POLARSSL_SHA256_C
-ecdsa_write_read_det_random:POLARSSL_ECP_DP_SECP256R1:POLARSSL_MD_SHA256
-
-ECDSA deterministic read-write random p256 sha384
-depends_on:POLARSSL_ECP_DP_SECP256R1_ENABLED:POLARSSL_SHA512_C
-ecdsa_write_read_det_random:POLARSSL_ECP_DP_SECP256R1:POLARSSL_MD_SHA384
-
-ECDSA deterministic read-write random p384 sha256
-depends_on:POLARSSL_ECP_DP_SECP384R1_ENABLED:POLARSSL_SHA256_C
-ecdsa_write_read_det_random:POLARSSL_ECP_DP_SECP384R1:POLARSSL_MD_SHA256
-
-ECDSA deterministic read-write random p384 sha384
-depends_on:POLARSSL_ECP_DP_SECP384R1_ENABLED:POLARSSL_SHA512_C
-ecdsa_write_read_det_random:POLARSSL_ECP_DP_SECP384R1:POLARSSL_MD_SHA384
-
-ECDSA deterministic read-write random p521 sha256
-depends_on:POLARSSL_ECP_DP_SECP521R1_ENABLED:POLARSSL_SHA256_C
-ecdsa_write_read_det_random:POLARSSL_ECP_DP_SECP521R1:POLARSSL_MD_SHA256
-
-ECDSA deterministic read-write random p521 sha384
-depends_on:POLARSSL_ECP_DP_SECP521R1_ENABLED:POLARSSL_SHA512_C
-ecdsa_write_read_det_random:POLARSSL_ECP_DP_SECP521R1:POLARSSL_MD_SHA384
diff --git a/tests/suites/test_suite_ecdsa.function b/tests/suites/test_suite_ecdsa.function
index 864fade..7d5e6df 100644
--- a/tests/suites/test_suite_ecdsa.function
+++ b/tests/suites/test_suite_ecdsa.function
@@ -132,12 +132,12 @@
 }
 /* END_CASE */
 
-/* BEGIN_CASE */
+/* BEGIN_CASE depends_on:POLARSSL_SHA256_C */
 void ecdsa_write_read_random( int id )
 {
     ecdsa_context ctx;
     rnd_pseudo_info rnd_info;
-    unsigned char hash[66];
+    unsigned char hash[32];
     unsigned char sig[200];
     size_t sig_len, i;
 
@@ -153,7 +153,8 @@
     TEST_ASSERT( ecdsa_genkey( &ctx, id, &rnd_pseudo_rand, &rnd_info ) == 0 );
 
     /* generate and write signature, then read and verify it */
-    TEST_ASSERT( ecdsa_write_signature( &ctx, hash, sizeof( hash ),
+    TEST_ASSERT( ecdsa_write_signature( &ctx, POLARSSL_MD_SHA256,
+                 hash, sizeof( hash ),
                  sig, &sig_len, &rnd_pseudo_rand, &rnd_info ) == 0 );
     TEST_ASSERT( ecdsa_read_signature( &ctx, hash, sizeof( hash ),
                  sig, sig_len ) == 0 );
@@ -191,35 +192,3 @@
 }
 /* END_CASE */
 
-/* BEGIN_CASE depends_on:POLARSSL_ECDSA_DETERMINISTIC */
-void ecdsa_write_read_det_random( int id, int md_alg )
-{
-    ecdsa_context ctx;
-    rnd_pseudo_info rnd_info;
-    unsigned char msg[100];
-    unsigned char hash[POLARSSL_MD_MAX_SIZE];
-    unsigned char sig[200];
-    size_t sig_len;
-
-    ecdsa_init( &ctx );
-    memset( &rnd_info, 0x00, sizeof( rnd_pseudo_info ) );
-    memset( hash, 0, sizeof( hash ) );
-    memset( sig, 0x2a, sizeof( sig ) );
-
-    /* prepare material for signature */
-    TEST_ASSERT( rnd_pseudo_rand( &rnd_info, msg, sizeof( msg ) ) == 0 );
-    md( md_info_from_type( md_alg ), msg, sizeof( msg ), hash );
-
-    /* generate signing key */
-    TEST_ASSERT( ecdsa_genkey( &ctx, id, &rnd_pseudo_rand, &rnd_info ) == 0 );
-
-    /* generate and write signature, then read and verify it */
-    TEST_ASSERT( ecdsa_write_signature_det( &ctx, hash, sizeof( hash ),
-                 sig, &sig_len, md_alg ) == 0 );
-    TEST_ASSERT( ecdsa_read_signature( &ctx, hash, sizeof( hash ),
-                 sig, sig_len ) == 0 );
-
-exit:
-    ecdsa_free( &ctx );
-}
-/* END_CASE */