1 //===- llvm/unittest/Support/SHA256Test.cpp - SHA256 tests
2 //----------------------===//
3 //
4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5 // See https://llvm.org/LICENSE.txt for license information.
6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements unit tests for the SHA256 functions.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "llvm/Support/SHA256.h"
15 #include "llvm/ADT/ArrayRef.h"
16 #include "llvm/ADT/SmallString.h"
17 #include "gtest/gtest.h"
18 
19 using namespace llvm;
20 
21 namespace {
22 
23 static std::string toHex(StringRef Input) {
24   static const char *const LUT = "0123456789abcdef";
25   size_t Length = Input.size();
26 
27   std::string Output;
28   Output.reserve(2 * Length);
29   for (size_t i = 0; i < Length; ++i) {
30     const unsigned char c = Input[i];
31     Output.push_back(LUT[c >> 4]);
32     Output.push_back(LUT[c & 15]);
33   }
34   return Output;
35 }
36 
37 /// Tests an arbitrary set of bytes passed as \p Input.
38 void TestSHA256Sum(ArrayRef<uint8_t> Input, StringRef Final) {
39   SHA256 Hash;
40   Hash.update(Input);
41   auto hash = Hash.final();
42   auto hashStr = toHex(hash);
43   EXPECT_EQ(hashStr, Final);
44 }
45 
46 using KV = std::pair<const char *, const char *>;
47 
48 TEST(SHA256Test, SHA256) {
49   std::array<KV, 5> testvectors{
50       KV{"",
51          "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"},
52       KV{"a",
53          "ca978112ca1bbdcafac231b39a23dc4da786eff8147c4e72b9807785afee48bb"},
54       KV{"abc",
55          "ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad"},
56       KV{"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq",
57          "248d6a61d20638b8e5c026930c3e6039a33ce45964ff2167f6ecedd419db06c1"},
58       KV{"abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmnhijklmnoijklm"
59          "nopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu",
60          "cf5b16a778af8380036ce59e7b0492370b249b11e8f07a51afac45037afee9d1"}};
61 
62   for (auto input_expected : testvectors) {
63     auto str = std::get<0>(input_expected);
64     auto expected = std::get<1>(input_expected);
65     TestSHA256Sum({reinterpret_cast<const uint8_t *>(str), strlen(str)},
66                   expected);
67   }
68 
69   std::string rep(1000, 'a');
70   SHA256 Hash;
71   for (int i = 0; i < 1000; ++i) {
72     Hash.update({reinterpret_cast<const uint8_t *>(rep.data()), rep.size()});
73   }
74   auto hash = Hash.final();
75   auto hashStr = toHex(hash);
76   EXPECT_EQ(hashStr,
77             "cdc76e5c9914fb9281a1c7e284d73e67f1809a48a497200e046d39ccc7112cd0");
78 }
79 
80 } // namespace
81