Implemented pipelined hash calculation in LoadFirmware()

vboot_firmware/lib/vboot_common.c

 /* 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.
  *
  * Common functions between firmware and kernel verified boot.
  * (Firmware portion)
  */
 
 
 #include "vboot_common.h"
@@ skipping 104 matching lines @@
   }
 
   if (!RSAVerifyBinary_f(NULL, key, data, sig->data_size,
                          GetSignatureDataC(sig), key->algorithm))
     return 1;
 
   return 0;
 }
 
 
+int VerifyDigest(const uint8_t* digest, const VbSignature *sig,
+                 const RSAPublicKey* key) {
+
+  if (sig->sig_size != siglen_map[key->algorithm]) {
+    debug("Wrong signature size for algorithm.\n");
+    return 1;
+  }
+
+  if (!RSAVerifyBinaryWithDigest_f(NULL, key, digest,
+                         GetSignatureDataC(sig), key->algorithm))
+    return 1;
+
+  return 0;
+}
+
+
 int KeyBlockVerify(const VbKeyBlockHeader* block, uint64_t size,
                    const VbPublicKey *key) {
 
   const VbSignature* sig;
 
   /* Sanity checks before attempting signature of data */
   if (SafeMemcmp(block->magic, KEY_BLOCK_MAGIC, KEY_BLOCK_MAGIC_SIZE)) {
     debug("Not a valid verified boot key block.\n");
     return VBOOT_KEY_BLOCK_INVALID;
   }
@@ skipping 161 matching lines @@
   /* Verify body signature is inside the block */
   if (VerifySignatureInside(preamble, preamble->preamble_size,
                             &preamble->body_signature)) {
     debug("Kernel body signature off end of preamble\n");
     return VBOOT_PREAMBLE_INVALID;
   }
 
   /* Success */
   return VBOOT_SUCCESS;
 }