Adapt programs to generic md_file()
diff --git a/programs/pkey/pk_sign.c b/programs/pkey/pk_sign.c
index be8b513..b84d047 100644
--- a/programs/pkey/pk_sign.c
+++ b/programs/pkey/pk_sign.c
@@ -35,38 +35,33 @@
 #define mbedtls_snprintf   snprintf
 #endif
 
-#if defined(MBEDTLS_BIGNUM_C) && defined(MBEDTLS_ENTROPY_C) && \
-    defined(MBEDTLS_SHA256_C) && \
-    defined(MBEDTLS_PK_PARSE_C) && defined(MBEDTLS_FS_IO) && \
-    defined(MBEDTLS_CTR_DRBG_C)
-#include "mbedtls/error.h"
-#include "mbedtls/entropy.h"
-#include "mbedtls/ctr_drbg.h"
-#include "mbedtls/md.h"
-#include "mbedtls/pk.h"
-#include "mbedtls/sha1.h"
-
-#include <stdio.h>
-#include <string.h>
-#endif
-
-#if defined _MSC_VER && !defined snprintf
-#define snprintf _snprintf
-#endif
-
 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) ||  \
-    !defined(MBEDTLS_SHA256_C) ||                                    \
+    !defined(MBEDTLS_SHA256_C) || !defined(MBEDTLS_MD_C) || \
     !defined(MBEDTLS_PK_PARSE_C) || !defined(MBEDTLS_FS_IO) ||    \
     !defined(MBEDTLS_CTR_DRBG_C)
 int main( void )
 {
     mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or "
-           "MBEDTLS_SHA256_C and/or "
+           "MBEDTLS_SHA256_C and/or MBEDLTS_MD_C and/or "
            "MBEDTLS_PK_PARSE_C and/or MBEDTLS_FS_IO and/or "
            "MBEDTLS_CTR_DRBG_C not defined.\n");
     return( 0 );
 }
 #else
+
+#include "mbedtls/error.h"
+#include "mbedtls/entropy.h"
+#include "mbedtls/ctr_drbg.h"
+#include "mbedtls/md.h"
+#include "mbedtls/pk.h"
+
+#include <stdio.h>
+#include <string.h>
+
+#if defined _MSC_VER && !defined snprintf
+#define snprintf _snprintf
+#endif
+
 int main( int argc, char *argv[] )
 {
     FILE *f;
@@ -123,7 +118,9 @@
     mbedtls_printf( "\n  . Generating the SHA-256 signature" );
     fflush( stdout );
 
-    if( ( ret = mbedtls_sha1_file( argv[2], hash ) ) != 0 )
+    if( ( ret = mbedtls_md_file(
+                    mbedtls_md_info_from_type( MBEDTLS_MD_SHA256 ),
+                    argv[2], hash ) ) != 0 )
     {
         mbedtls_printf( " failed\n  ! Could not open or read %s\n\n", argv[2] );
         goto exit;