diff --git a/programs/random/gen_entropy.c b/programs/random/gen_entropy.c
index 4deb924..630eb4b 100644
--- a/programs/random/gen_entropy.c
+++ b/programs/random/gen_entropy.c
@@ -20,33 +20,32 @@
 #include "mbedtls/build_info.h"
 
 #if defined(MBEDTLS_PLATFORM_C)
-#include "mbedtls/platform.h"
+#    include "mbedtls/platform.h"
 #else
-#include <stdio.h>
-#include <stdlib.h>
-#define mbedtls_fprintf         fprintf
-#define mbedtls_printf          printf
-#define mbedtls_exit            exit
-#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
-#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#    include <stdio.h>
+#    include <stdlib.h>
+#    define mbedtls_fprintf      fprintf
+#    define mbedtls_printf       printf
+#    define mbedtls_exit         exit
+#    define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
+#    define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
 #endif /* MBEDTLS_PLATFORM_C */
 
 #if defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_FS_IO)
-#include "mbedtls/entropy.h"
+#    include "mbedtls/entropy.h"
 
-#include <stdio.h>
+#    include <stdio.h>
 #endif
 
 #if !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_FS_IO)
-int main( void )
+int main(void)
 {
     mbedtls_printf("MBEDTLS_ENTROPY_C and/or MBEDTLS_FS_IO not defined.\n");
-    mbedtls_exit( 0 );
+    mbedtls_exit(0);
 }
 #else
 
-
-int main( int argc, char *argv[] )
+int main(int argc, char *argv[])
 {
     FILE *f;
     int i, k, ret = 1;
@@ -54,45 +53,44 @@
     mbedtls_entropy_context entropy;
     unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE];
 
-    if( argc < 2 )
-    {
-        mbedtls_fprintf( stderr, "usage: %s <output filename>\n", argv[0] );
-        mbedtls_exit( exit_code );
+    if (argc < 2) {
+        mbedtls_fprintf(stderr, "usage: %s <output filename>\n", argv[0]);
+        mbedtls_exit(exit_code);
     }
 
-    if( ( f = fopen( argv[1], "wb+" ) ) == NULL )
-    {
-        mbedtls_printf( "failed to open '%s' for writing.\n", argv[1] );
-        mbedtls_exit( exit_code );
+    if ((f = fopen(argv[1], "wb+")) == NULL) {
+        mbedtls_printf("failed to open '%s' for writing.\n", argv[1]);
+        mbedtls_exit(exit_code);
     }
 
-    mbedtls_entropy_init( &entropy );
+    mbedtls_entropy_init(&entropy);
 
-    for( i = 0, k = 768; i < k; i++ )
-    {
-        ret = mbedtls_entropy_func( &entropy, buf, sizeof( buf ) );
-        if( ret != 0 )
-        {
-            mbedtls_printf( "  failed\n  !  mbedtls_entropy_func returned -%04X\n",
-                            (unsigned int) ret );
+    for (i = 0, k = 768; i < k; i++) {
+        ret = mbedtls_entropy_func(&entropy, buf, sizeof(buf));
+        if (ret != 0) {
+            mbedtls_printf(
+                "  failed\n  !  mbedtls_entropy_func returned -%04X\n",
+                (unsigned int)ret);
             goto cleanup;
         }
 
-        fwrite( buf, 1, sizeof( buf ), f );
+        fwrite(buf, 1, sizeof(buf), f);
 
-        mbedtls_printf( "Generating %ldkb of data in file '%s'... %04.1f" \
-                "%% done\r", (long)(sizeof(buf) * k / 1024), argv[1], (100 * (float) (i + 1)) / k );
-        fflush( stdout );
+        mbedtls_printf("Generating %ldkb of data in file '%s'... %04.1f"
+                       "%% done\r",
+                       (long)(sizeof(buf) * k / 1024), argv[1],
+                       (100 * (float)(i + 1)) / k);
+        fflush(stdout);
     }
 
     exit_code = MBEDTLS_EXIT_SUCCESS;
 
 cleanup:
-    mbedtls_printf( "\n" );
+    mbedtls_printf("\n");
 
-    fclose( f );
-    mbedtls_entropy_free( &entropy );
+    fclose(f);
+    mbedtls_entropy_free(&entropy);
 
-    mbedtls_exit( exit_code );
+    mbedtls_exit(exit_code);
 }
 #endif /* MBEDTLS_ENTROPY_C */