Crypto: Add SHA512 hasher

Needed by the content-in-CAS git map to check fetched archives' checksums.
SHA1 and SHA256 hashers are already implemented.

6 files changed, 110 insertions, 3 deletions

diff --git a/src/buildtool/crypto/TARGETS b/src/buildtool/crypto/TARGETS
index 4f73badf..9598206c 100644
--- a/src/buildtool/crypto/TARGETS
+++ b/src/buildtool/crypto/TARGETS
@@ -1,8 +1,18 @@
 { "hasher":
   { "type": ["@", "rules", "CC", "library"]
   , "name": ["hasher"]
-  , "hdrs": ["hasher.hpp", "hash_impl_sha1.hpp", "hash_impl_sha256.hpp"]
-  , "srcs": ["hasher.cpp", "hash_impl_sha1.cpp", "hash_impl_sha256.cpp"]
+  , "hdrs":
+    [ "hasher.hpp"
+    , "hash_impl_sha1.hpp"
+    , "hash_impl_sha256.hpp"
+    , "hash_impl_sha512.hpp"
+    ]
+  , "srcs":
+    [ "hasher.cpp"
+    , "hash_impl_sha1.cpp"
+    , "hash_impl_sha256.cpp"
+    , "hash_impl_sha512.cpp"
+    ]
   , "stage": ["src", "buildtool", "crypto"]
   , "deps":
     [["src/buildtool/logging", "logging"], ["src/utils/cpp", "hex_string"]]
diff --git a/src/buildtool/crypto/hash_impl_sha512.cpp b/src/buildtool/crypto/hash_impl_sha512.cpp
new file mode 100644
index 00000000..802ebf0e
--- /dev/null
+++ b/src/buildtool/crypto/hash_impl_sha512.cpp
@@ -0,0 +1,61 @@
+// Copyright 2022 Huawei Cloud Computing Technology Co., Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "src/buildtool/crypto/hash_impl_sha512.hpp"
+
+#include <array>
+#include <cstdint>
+
+#include "openssl/sha.h"
+
+/// \brief Hash implementation for SHA-512
+class HashImplSha512 final : public Hasher::IHashImpl {
+  public:
+    HashImplSha512() { initialized_ = SHA512_Init(&ctx_) == 1; }
+
+    auto Update(std::string const& data) noexcept -> bool final {
+        return initialized_ and
+               SHA512_Update(&ctx_, data.data(), data.size()) == 1;
+    }
+
+    auto Finalize() && noexcept -> std::optional<std::string> final {
+        if (initialized_) {
+            auto out = std::array<std::uint8_t, SHA512_DIGEST_LENGTH>{};
+            if (SHA512_Final(out.data(), &ctx_) == 1) {
+                return std::string{out.begin(), out.end()};
+            }
+        }
+        return std::nullopt;
+    }
+
+    auto Compute(std::string const& data) && noexcept -> std::string final {
+        if (Update(data)) {
+            auto digest = std::move(*this).Finalize();
+            if (digest) {
+                return *digest;
+            }
+        }
+        FatalError();
+        return {};
+    }
+
+  private:
+    SHA512_CTX ctx_{};
+    bool initialized_{};
+};
+
+/// \brief Factory for SHA-512 implementation
+auto CreateHashImplSha512() -> std::unique_ptr<Hasher::IHashImpl> {
+    return std::make_unique<HashImplSha512>();
+}
diff --git a/src/buildtool/crypto/hash_impl_sha512.hpp b/src/buildtool/crypto/hash_impl_sha512.hpp
new file mode 100644
index 00000000..8a32cc42
--- /dev/null
+++ b/src/buildtool/crypto/hash_impl_sha512.hpp
@@ -0,0 +1,25 @@
+// Copyright 2022 Huawei Cloud Computing Technology Co., Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef INCLUDED_SRC_BUILDTOOL_CRYPTO_HASH_IMPL_SHA512_HPP
+#define INCLUDED_SRC_BUILDTOOL_CRYPTO_HASH_IMPL_SHA512_HPP
+
+#include <memory>
+
+#include "src/buildtool/crypto/hasher.hpp"
+
+[[nodiscard]] extern auto CreateHashImplSha512()
+    -> std::unique_ptr<Hasher::IHashImpl>;
+
+#endif  // INCLUDED_SRC_BUILDTOOL_CRYPTO_HASH_IMPL_SHA512_HPP
diff --git a/src/buildtool/crypto/hasher.cpp b/src/buildtool/crypto/hasher.cpp
index c3c0a3dd..60a029c2 100644
--- a/src/buildtool/crypto/hasher.cpp
+++ b/src/buildtool/crypto/hasher.cpp
@@ -16,6 +16,7 @@
 
 #include "src/buildtool/crypto/hash_impl_sha1.hpp"
 #include "src/buildtool/crypto/hash_impl_sha256.hpp"
+#include "src/buildtool/crypto/hash_impl_sha512.hpp"
 
 auto Hasher::CreateHashImpl(HashType type) noexcept
     -> std::unique_ptr<IHashImpl> {
@@ -24,6 +25,8 @@ auto Hasher::CreateHashImpl(HashType type) noexcept
             return CreateHashImplSha1();
         case HashType::SHA256:
             return CreateHashImplSha256();
+        case HashType::SHA512:
+            return CreateHashImplSha512();
     }
     return nullptr;  // make gcc happy
 }
diff --git a/src/buildtool/crypto/hasher.hpp b/src/buildtool/crypto/hasher.hpp
index 68247038..6abf2b0c 100644
--- a/src/buildtool/crypto/hasher.hpp
+++ b/src/buildtool/crypto/hasher.hpp
@@ -27,7 +27,7 @@
 class Hasher {
   public:
     /// \brief Types of hash implementations supported by generator.
-    enum class HashType : std::uint8_t { SHA1, SHA256 };
+    enum class HashType : std::uint8_t { SHA1, SHA256, SHA512 };
 
     /// \brief The universal hash digest.
     /// The type of hash and the digest length depends on the hash
diff --git a/test/buildtool/crypto/hasher.test.cpp b/test/buildtool/crypto/hasher.test.cpp
index 594e4504..45f24db7 100644
--- a/test/buildtool/crypto/hasher.test.cpp
+++ b/test/buildtool/crypto/hasher.test.cpp
@@ -39,4 +39,12 @@ TEST_CASE("Hasher", "[crypto]") {
             bytes,
             "9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08");
     }
+
+    SECTION("SHA-512") {
+        // same as: echo -n test | sha512sum
+        test_increment_hash<Hasher::HashType::SHA512>(
+            bytes,
+            "ee26b0dd4af7e749aa1a8ee3c10ae9923f618980772e473f8819a5d4940e0db27a"
+            "c185f8a0e1d5f84f88bc887fd67b143732c304cc5fa9ad8e6f57f50028a8ff");
+    }
 }