1 files changed, 75 insertions, 0 deletions
diff --git a/programs/random/gen_entropy.c b/programs/random/gen_entropy.c
new file mode 100644
index 00000000000..887b2c9883c
--- /dev/null
+++ b/programs/random/gen_entropy.c
@@ -0,0 +1,75 @@
+/**
+ *  \brief Use and generate multiple entropies calls into a file
+ *
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+ */
+
+#include "mbedtls/build_info.h"
+
+#include "mbedtls/platform.h"
+
+#if defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_FS_IO)
+#include "mbedtls/entropy.h"
+
+#include <stdio.h>
+#endif
+
+#if !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_FS_IO)
+int main(void)
+{
+    mbedtls_printf("MBEDTLS_ENTROPY_C and/or MBEDTLS_FS_IO not defined.\n");
+    mbedtls_exit(0);
+}
+#else
+
+
+int main(int argc, char *argv[])
+{
+    FILE *f;
+    int i, k, ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
+    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 ((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);
+
+    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);
+
+        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");
+
+    fclose(f);
+    mbedtls_entropy_free(&entropy);
+
+    mbedtls_exit(exit_code);
+}
+#endif /* MBEDTLS_ENTROPY_C */