Data structure and interface for manipulating and handing firmware images for verified boot.

Review URL: http://codereview.chromium.org/564020

utils/file_keys.c

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+/* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * Utility functions for file and key handling.
+ */
+
+#include "file_keys.h"
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "rsa_utility.h"
+#include "utility.h"
+
+uint8_t* BufferFromFile(char* input_file, int* len) {
+  int fd;
+  struct stat stat_fd;
+  uint8_t* buf = NULL;
+
+  if ((fd = open(input_file, O_RDONLY)) == -1) {
+    fprintf(stderr, "Couldn't open file.\n");
+    return NULL;
+  }
+
+  if (-1 == fstat(fd, &stat_fd)) {
+    fprintf(stderr, "Couldn't stat key file\n");
+    return NULL;
+  }
+  *len = stat_fd.st_size;
+
+  /* Read entire key binary blob into a buffer. */
+  buf = (uint8_t*) Malloc(*len);
+  if (!buf)
+    return NULL;
+
+  if (*len != read(fd, buf, *len)) {
+    fprintf(stderr, "Couldn't read key into a buffer.\n");
+    return NULL;
+  }
+
+  close(fd);
+  return buf;
+}
+
+RSAPublicKey* RSAPublicKeyFromFile(char* input_file) {
+  int len;
+  uint8_t* buf = BufferFromFile(input_file, &len);
+  RSAPublicKey* key = RSAPublicKeyFromBuf(buf, len);
+  Free(buf);
+  return key;
+}