Added serialization to SecureHash.

crypto/secure_hash_unittest.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "crypto/secure_hash.h"
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/pickle.h"
 #include "crypto/sha2.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 TEST(SecureHashTest, TestUpdate) {
   // Example B.3 from FIPS 180-2: long message.
   std::string input3(500000, 'a');  // 'a' repeated half a million times
   int expected3[] = { 0xcd, 0xc7, 0x6e, 0x5c,
                       0x99, 0x14, 0xfb, 0x92,
                       0x81, 0xa1, 0xc7, 0xe2,
                       0x84, 0xd7, 0x3e, 0x67,
                       0xf1, 0x80, 0x9a, 0x48,
                       0xa4, 0x97, 0x20, 0x0e,
                       0x04, 0x6d, 0x39, 0xcc,
                       0xc7, 0x11, 0x2c, 0xd0 };
 
   uint8 output3[crypto::kSHA256Length];
 
   scoped_ptr<crypto::SecureHash> ctx(crypto::SecureHash::Create(
       crypto::SecureHash::SHA256));
   ctx->Update(input3.data(), input3.size());
   ctx->Update(input3.data(), input3.size());
 
   ctx->Finish(output3, sizeof(output3));
   for (size_t i = 0; i < crypto::kSHA256Length; i++)
     EXPECT_EQ(expected3[i], static_cast<int>(output3[i]));
 }
+
+// Save the crypto state mid-stream, and create another instance with the
+// saved state.  Then feed the same data afterwards to both.
+// When done, both should have the same hash value.
+TEST(SecureHashTest, TestSerialization) {
+  std::string input1(10001, 'a');  // 'a' repeated 10001 times
+  std::string input2(10001, 'b');  // 'b' repeated 10001 times
+  std::string input3(10001, 'c');  // 'c' repeated 10001 times
+  std::string input4(10001, 'd');  // 'd' repeated 10001 times
+  std::string input5(10001, 'e');  // 'e' repeated 10001 times
+
+  uint8 output1[crypto::kSHA256Length];
+  uint8 output2[crypto::kSHA256Length];
+
+  scoped_ptr<crypto::SecureHash> ctx1(crypto::SecureHash::Create(
+      crypto::SecureHash::SHA256));
+  scoped_ptr<crypto::SecureHash> ctx2(crypto::SecureHash::Create(
+      crypto::SecureHash::SHA256));
+  Pickle pickle;
+  ctx1->Update(input1.data(), input1.size());
+  ctx1->Update(input2.data(), input2.size());
+  ctx1->Update(input3.data(), input3.size());
+
+  EXPECT_TRUE(ctx1->Serialize(&pickle));
+  ctx1->Update(input4.data(), input4.size());
+  ctx1->Update(input5.data(), input5.size());
+
+  ctx1->Finish(output1, sizeof(output1));
+
+  void* data_iterator = NULL;
+  EXPECT_TRUE(ctx2->Deserialize(&data_iterator, &pickle));
+  ctx2->Update(input4.data(), input4.size());
+  ctx2->Update(input5.data(), input5.size());
+
+  ctx2->Finish(output2, sizeof(output2));
+
+  EXPECT_EQ(0, memcmp(output1, output2, crypto::kSHA256Length));
+}