Adding upstream version 2.2.0.upstream/2.2.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 199 insertions, 0 deletions

diff --git a/src/lib/cryptolink/botan_hash.cc b/src/lib/cryptolink/botan_hash.cc
new file mode 100644
index 0000000..06dca6d
--- /dev/null
+++ b/src/lib/cryptolink/botan_hash.cc
@@ -0,0 +1,199 @@
+// Copyright (C) 2014-2020 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <cryptolink.h>
+#include <cryptolink/crypto_hash.h>
+
+#include <boost/scoped_ptr.hpp>
+
+#include <botan/lookup.h>
+
+#include <cryptolink/botan_common.h>
+
+namespace isc {
+namespace cryptolink {
+
+const std::string
+btn::getHashAlgorithmName(HashAlgorithm algorithm) {
+    switch (algorithm) {
+    case isc::cryptolink::MD5:
+        return ("MD5");
+    case isc::cryptolink::SHA1:
+        return ("SHA-1");
+    case isc::cryptolink::SHA256:
+        return ("SHA-256");
+    case isc::cryptolink::SHA224:
+        return ("SHA-224");
+    case isc::cryptolink::SHA384:
+        return ("SHA-384");
+    case isc::cryptolink::SHA512:
+        return ("SHA-512");
+    case isc::cryptolink::UNKNOWN_HASH:
+        return ("Unknown");
+    }
+    // compiler should have prevented us to reach this, since we have
+    // no default. But we need a return value anyway
+    return ("Unknown");
+}
+
+/// @brief Botan implementation of Hash. Each method is the counterpart
+/// of the Hash corresponding method.
+class HashImpl {
+public:
+
+    /// @brief Constructor for specific hash algorithm
+    ///
+    /// @param hash_algorithm The hash algorithm
+    explicit HashImpl(const HashAlgorithm hash_algorithm)
+    : hash_algorithm_(hash_algorithm), hash_() {
+        Botan::HashFunction* hash;
+        try {
+            const std::string& name =
+                btn::getHashAlgorithmName(hash_algorithm);
+            hash = Botan::HashFunction::create(name).release();
+        } catch (const Botan::Algorithm_Not_Found&) {
+            isc_throw(isc::cryptolink::UnsupportedAlgorithm,
+                      "Unknown hash algorithm: " <<
+                      static_cast<int>(hash_algorithm));
+        } catch (const Botan::Exception& exc) {
+            isc_throw(isc::cryptolink::LibraryError,
+                      "Botan error: " << exc.what());
+        }
+
+        hash_.reset(hash);
+    }
+
+    /// @brief Destructor
+    ~HashImpl() { }
+
+    /// @brief Returns the HashAlgorithm of the object
+    HashAlgorithm getHashAlgorithm() const {
+        return (hash_algorithm_);
+    }
+
+    /// @brief Returns the output size of the digest
+    ///
+    /// @return output size of the digest
+    size_t getOutputLength() const {
+        return (hash_->output_length());
+    }
+
+    /// @brief Adds data to the digest
+    ///
+    /// See @ref isc::cryptolink::Hash::update() for details.
+    void update(const void* data, const size_t len) {
+        try {
+            hash_->update(static_cast<const Botan::byte*>(data), len);
+        } catch (const Botan::Exception& exc) {
+            isc_throw(isc::cryptolink::LibraryError,
+                      "Botan error: " << exc.what());
+        }
+    }
+
+    /// @brief Calculate the final digest
+    ///
+    /// See @ref isc::cryptolink::Hash::final() for details.
+    void final(isc::util::OutputBuffer& result, size_t len) {
+        try {
+            Botan::secure_vector<Botan::byte> b_result(hash_->final());
+
+            if (len > b_result.size()) {
+                len = b_result.size();
+            }
+            result.writeData(&b_result[0], len);
+        } catch (const Botan::Exception& exc) {
+            isc_throw(isc::cryptolink::LibraryError,
+                      "Botan error: " << exc.what());
+        }
+    }
+
+    /// @brief Calculate the final digest
+    ///
+    /// See @ref isc::cryptolink::Hash::final() for details.
+    void final(void* result, size_t len) {
+        try {
+            Botan::secure_vector<Botan::byte> b_result(hash_->final());
+            size_t output_size = getOutputLength();
+            if (output_size > len) {
+                output_size = len;
+            }
+            std::memcpy(result, &b_result[0], output_size);
+        } catch (const Botan::Exception& exc) {
+            isc_throw(isc::cryptolink::LibraryError,
+                      "Botan error: " << exc.what());
+        }
+    }
+
+    /// @brief Calculate the final digest
+    ///
+    /// See @ref isc::cryptolink::Hash::final() for details.
+    std::vector<uint8_t> final(size_t len) {
+        try {
+            Botan::secure_vector<Botan::byte> b_result(hash_->final());
+            if (len > b_result.size()) {
+                len = b_result.size();
+            }
+            // Return vector with content. Construct &b_result[len] attempts
+            // to get an address of one element beyond the b_result. Replaced
+            // with the address of first element + len
+            return (std::vector<uint8_t>(&b_result[0], &b_result[0]+len));
+        } catch (const Botan::Exception& exc) {
+            isc_throw(isc::cryptolink::LibraryError,
+                      "Botan error: " << exc.what());
+        }
+    }
+
+private:
+    /// @brief The hash algorithm
+    HashAlgorithm hash_algorithm_;
+
+    /// @brief The protected pointer to the Botan HashFunction object
+    boost::scoped_ptr<Botan::HashFunction> hash_;
+};
+
+Hash::Hash(const HashAlgorithm hash_algorithm)
+{
+    impl_ = new HashImpl(hash_algorithm);
+}
+
+Hash::~Hash() {
+    delete impl_;
+}
+
+HashAlgorithm
+Hash::getHashAlgorithm() const {
+    return (impl_->getHashAlgorithm());
+}
+
+size_t
+Hash::getOutputLength() const {
+    return (impl_->getOutputLength());
+}
+
+void
+Hash::update(const void* data, const size_t len) {
+    impl_->update(data, len);
+}
+
+void
+Hash::final(isc::util::OutputBuffer& result, size_t len) {
+    impl_->final(result, len);
+}
+
+void
+Hash::final(void* result, size_t len) {
+    impl_->final(result, len);
+}
+
+std::vector<uint8_t>
+Hash::final(size_t len) {
+    return impl_->final(len);
+}
+
+} // namespace cryptolink
+} // namespace isc