1 files changed, 28 insertions, 0 deletions
diff --git a/t/helper/test-csprng.c b/t/helper/test-csprng.c
new file mode 100644
index 0000000000..c86dcc4870
--- /dev/null
+++ b/t/helper/test-csprng.c
@@ -0,0 +1,28 @@
+#include "test-tool.h"
+#include "git-compat-util.h"
+
+int cmd__csprng(int argc, const char **argv)
+{
+	unsigned long count;
+	unsigned char buf[1024];
+
+	if (argc > 2) {
+		fprintf(stderr, "usage: %s [<size>]\n", argv[0]);
+		return 2;
+	}
+
+	count = (argc == 2) ? strtoul(argv[1], NULL, 0) : ULONG_MAX;
+
+	while (count) {
+		unsigned long chunk = count < sizeof(buf) ? count : sizeof(buf);
+		if (csprng_bytes(buf, chunk, 0) < 0) {
+			perror("failed to read");
+			return 5;
+		}
+		if (fwrite(buf, chunk, 1, stdout) != chunk)
+			return 1;
+		count -= chunk;
+	}
+
+	return 0;
+}