test: disable RSA support on the test ecc_no_bignum component

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/library/pkparse.c b/library/pkparse.c
index f03ace2..78eb4bc 100644
--- a/library/pkparse.c
+++ b/library/pkparse.c
@@ -34,7 +34,7 @@
 #include "mbedtls/rsa.h"
 #endif
 #include "mbedtls/ecp.h"
-#if defined(MBEDTLS_RSA_C) || defined(MBEDTLS_ECP_C)
+#if defined(MBEDTLS_RSA_C) || defined(MBEDTLS_PK_HAVE_ECC_KEYS)
 #include "pkwrite.h"
 #endif
 #if defined(MBEDTLS_PK_HAVE_ECC_KEYS)
diff --git a/library/pkwrite.h b/library/pkwrite.h
index aa2f17b..bc40437 100644
--- a/library/pkwrite.h
+++ b/library/pkwrite.h
@@ -85,7 +85,7 @@
  *                                            + 2 * ECP_MAX (coords)    [1]
  *  }
  */
-#define MBEDTLS_PK_ECP_PUB_DER_MAX_BYTES    (30 + 2 * MBEDTLS_ECP_MAX_BYTES)
+#define MBEDTLS_PK_ECP_PUB_DER_MAX_BYTES    (30 + 2 * 66)
 
 /*
  * EC private keys:
@@ -96,7 +96,7 @@
  *      publicKey  [1] BIT STRING OPTIONAL      1 + 2 + [1] above
  *    }
  */
-#define MBEDTLS_PK_ECP_PRV_DER_MAX_BYTES    (29 + 3 * MBEDTLS_ECP_MAX_BYTES)
+#define MBEDTLS_PK_ECP_PRV_DER_MAX_BYTES    (29 + 3 * 66)
 
 #else /* MBEDTLS_PK_HAVE_ECC_KEYS */