1 files changed, 188 insertions, 0 deletions
diff --git a/src/lib/cryptolink/openssl_hash.cc b/src/lib/cryptolink/openssl_hash.cc
new file mode 100644
index 0000000..68f2285
--- /dev/null
+++ b/src/lib/cryptolink/openssl_hash.cc
@@ -0,0 +1,188 @@
+// 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 <openssl/evp.h>
+
+#include <cryptolink/openssl_common.h>
+#define KEA_HASH
+#include <cryptolink/openssl_compat.h>
+
+#include <cstring>
+
+namespace isc {
+namespace cryptolink {
+
+const EVP_MD*
+ossl::getHashAlgorithm(HashAlgorithm algorithm) {
+    switch (algorithm) {
+    case isc::cryptolink::MD5:
+        return (EVP_md5());
+    case isc::cryptolink::SHA1:
+        return (EVP_sha1());
+    case isc::cryptolink::SHA256:
+        return (EVP_sha256());
+    case isc::cryptolink::SHA224:
+        return (EVP_sha224());
+    case isc::cryptolink::SHA384:
+        return (EVP_sha384());
+    case isc::cryptolink::SHA512:
+        return (EVP_sha512());
+    case isc::cryptolink::UNKNOWN_HASH:
+        return (0);
+    }
+    // compiler should have prevented us to reach this, since we have
+    // no default. But we need a return value anyway
+    return (0);
+}
+
+/// \brief OpenSSL 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), md_(0) {
+        const EVP_MD* algo = ossl::getHashAlgorithm(hash_algorithm);
+        if (algo == 0) {
+            isc_throw(isc::cryptolink::UnsupportedAlgorithm,
+                      "Unknown hash algorithm: " <<
+                      static_cast<int>(hash_algorithm));
+        }
+
+        md_ = EVP_MD_CTX_new();
+        if (md_ == 0) {
+            isc_throw(isc::cryptolink::LibraryError,
+                      "OpenSSL EVP_MD_CTX_new() failed");
+        }
+
+        EVP_DigestInit_ex(md_, algo, NULL);
+    }
+
+    /// @brief Destructor
+    ~HashImpl() {
+        if (md_) {
+            EVP_MD_CTX_free(md_);
+        }
+        md_ = 0;
+    }
+
+    /// @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 (EVP_MD_CTX_size(md_));
+    }
+
+    /// @brief Adds data to the digest
+    ///
+    /// See @ref isc::cryptolink::Hash::update() for details.
+    void update(const void* data, const size_t len) {
+        EVP_DigestUpdate(md_, data, len);
+    }
+
+    /// @brief Calculate the final digest
+    ///
+    /// See @ref isc::cryptolink::Hash::final() for details.
+    void final(isc::util::OutputBuffer& result, size_t len) {
+        size_t size = getOutputLength();
+        std::vector<unsigned char> digest(size);
+        EVP_DigestFinal_ex(md_, &digest[0], NULL);
+        if (len > size) {
+             len = size;
+        }
+        result.writeData(&digest[0], len);
+    }
+
+    /// @brief Calculate the final digest
+    ///
+    /// See @ref isc::cryptolink::Hash::final() for details.
+    void final(void* result, size_t len) {
+        size_t size = getOutputLength();
+        std::vector<unsigned char> digest(size);
+        EVP_DigestFinal_ex(md_, &digest[0], NULL);
+        if (len > size) {
+             len = size;
+        }
+        std::memcpy(result, &digest[0], len);
+    }
+
+    /// @brief Calculate the final digest
+    ///
+    /// See @ref isc::cryptolink::Hash::final() for details.
+    std::vector<uint8_t> final(size_t len) {
+        size_t size = getOutputLength();
+        std::vector<unsigned char> digest(size);
+        EVP_DigestFinal_ex(md_, &digest[0], NULL);
+        if (len < size) {
+            digest.resize(len);
+        }
+        return (std::vector<uint8_t>(digest.begin(), digest.end()));
+    }
+
+private:
+    /// @brief The hash algorithm
+    HashAlgorithm hash_algorithm_;
+
+    /// @brief The pointer to the OpenSSL EVP_MD_CTX structure
+    EVP_MD_CTX* md_;
+};
+
+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