Merge pull request #4694 from gilles-peskine-arm/out_size-3.0

Add output size parameter to signature functions

programs/pkey/ecdsa.c

@@ -180,7 +180,7 @@ int main( int argc, char *argv[] )
 
     if( ( ret = mbedtls_ecdsa_write_signature( &ctx_sign, MBEDTLS_MD_SHA256,
                                        hash, sizeof( hash ),
-                                       sig, &sig_len,
+                                       sig, sizeof( sig ), &sig_len,
                                        mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
     {
         mbedtls_printf( " failed\n  ! mbedtls_ecdsa_write_signature returned %d\n", ret );