diff --git a/internal/ceres/covariance.cc b/internal/ceres/covariance.cc
new file mode 100644
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--- /dev/null
+++ b/internal/ceres/covariance.cc
@@ -0,0 +1,99 @@
+// Ceres Solver - A fast non-linear least squares minimizer
+// Copyright 2015 Google Inc. All rights reserved.
+// http://ceres-solver.org/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// * Redistributions of source code must retain the above copyright notice,
+//   this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright notice,
+//   this list of conditions and the following disclaimer in the documentation
+//   and/or other materials provided with the distribution.
+// * Neither the name of Google Inc. nor the names of its contributors may be
+//   used to endorse or promote products derived from this software without
+//   specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: sameeragarwal@google.com (Sameer Agarwal)
+
+#include "ceres/covariance.h"
+
+#include <utility>
+#include <vector>
+#include "ceres/covariance_impl.h"
+#include "ceres/problem.h"
+#include "ceres/problem_impl.h"
+
+namespace ceres {
+
+using std::make_pair;
+using std::pair;
+using std::vector;
+
+Covariance::Covariance(const Covariance::Options& options) {
+  impl_.reset(new internal::CovarianceImpl(options));
+}
+
+Covariance::~Covariance() {
+}
+
+bool Covariance::Compute(
+    const vector<pair<const double*, const double*>>& covariance_blocks,
+    Problem* problem) {
+  return impl_->Compute(covariance_blocks, problem->problem_impl_.get());
+}
+
+bool Covariance::Compute(
+    const vector<const double*>& parameter_blocks,
+    Problem* problem) {
+  return impl_->Compute(parameter_blocks, problem->problem_impl_.get());
+}
+
+bool Covariance::GetCovarianceBlock(const double* parameter_block1,
+                                    const double* parameter_block2,
+                                    double* covariance_block) const {
+  return impl_->GetCovarianceBlockInTangentOrAmbientSpace(parameter_block1,
+                                                          parameter_block2,
+                                                          true,  // ambient
+                                                          covariance_block);
+}
+
+bool Covariance::GetCovarianceBlockInTangentSpace(
+    const double* parameter_block1,
+    const double* parameter_block2,
+    double* covariance_block) const {
+  return impl_->GetCovarianceBlockInTangentOrAmbientSpace(parameter_block1,
+                                                          parameter_block2,
+                                                          false,  // tangent
+                                                          covariance_block);
+}
+
+bool Covariance::GetCovarianceMatrix(
+    const vector<const double*>& parameter_blocks,
+    double* covariance_matrix) {
+  return impl_->GetCovarianceMatrixInTangentOrAmbientSpace(parameter_blocks,
+                                                           true,  // ambient
+                                                           covariance_matrix);
+}
+
+bool Covariance::GetCovarianceMatrixInTangentSpace(
+    const std::vector<const double *>& parameter_blocks,
+    double *covariance_matrix) {
+  return impl_->GetCovarianceMatrixInTangentOrAmbientSpace(parameter_blocks,
+                                                           false,  // tangent
+                                                           covariance_matrix);
+}
+
+}  // namespace ceres