diff --git a/confirmationui/support/src/cbor.cpp b/confirmationui/support/src/cbor.cpp
new file mode 100644
index 0000000..e7ea164
--- /dev/null
+++ b/confirmationui/support/src/cbor.cpp
@@ -0,0 +1,111 @@
+/*
+**
+** Copyright 2017, The Android Open Source Project
+**
+** 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 <android/hardware/confirmationui/support/cbor.h>
+
+namespace android {
+namespace hardware {
+namespace confirmationui {
+namespace support {
+namespace {
+
+inline uint8_t getByte(const uint64_t& v, const uint8_t index) {
+    return v >> (index * 8);
+}
+
+WriteState writeBytes(WriteState state, uint64_t value, uint8_t size) {
+    auto pos = state.data_;
+    if (!(state += size)) return state;
+    switch (size) {
+        case 8:
+            *pos++ = getByte(value, 7);
+            *pos++ = getByte(value, 6);
+            *pos++ = getByte(value, 5);
+            *pos++ = getByte(value, 4);
+        case 4:
+            *pos++ = getByte(value, 3);
+            *pos++ = getByte(value, 2);
+        case 2:
+            *pos++ = getByte(value, 1);
+        case 1:
+            *pos++ = value;
+            break;
+        default:
+            state.error_ = Error::MALFORMED;
+    }
+    return state;
+}
+
+}  // anonymous namespace
+
+WriteState writeHeader(WriteState wState, Type type, const uint64_t value) {
+    if (!wState) return wState;
+    uint8_t& header = *wState.data_;
+    if (!++wState) return wState;
+    header = static_cast<uint8_t>(type) << 5;
+    if (value < 24) {
+        header |= static_cast<uint8_t>(value);
+    } else if (value < 0x100) {
+        header |= 24;
+        wState = writeBytes(wState, value, 1);
+    } else if (value < 0x10000) {
+        header |= 25;
+        wState = writeBytes(wState, value, 2);
+    } else if (value < 0x100000000) {
+        header |= 26;
+        wState = writeBytes(wState, value, 4);
+    } else {
+        header |= 27;
+        wState = writeBytes(wState, value, 8);
+    }
+    return wState;
+}
+
+bool checkUTF8Copy(const char* begin, const char* const end, uint8_t* out) {
+    uint32_t multi_byte_length = 0;
+    while (begin != end) {
+        if (multi_byte_length) {
+            // parsing multi byte character - must start with 10xxxxxx
+            --multi_byte_length;
+            if ((*begin & 0xc0) != 0x80) return false;
+        } else if (!((*begin) & 0x80)) {
+            // 7bit character -> nothing to be done
+        } else {
+            // msb is set and we were not parsing a multi byte character
+            // so this must be a header byte
+            char c = *begin << 1;
+            while (c & 0x80) {
+                ++multi_byte_length;
+                c <<= 1;
+            }
+            // headers of the form 10xxxxxx are not allowed
+            if (multi_byte_length < 1) return false;
+            // chars longer than 4 bytes are not allowed (multi_byte_length does not count the
+            // header thus > 3
+            if (multi_byte_length > 3) return false;
+        }
+        if (out) *out++ = *reinterpret_cast<const uint8_t*>(begin++);
+    }
+    // if the string ends in the middle of a multi byte char it is invalid
+    if (multi_byte_length) return false;
+    return true;
+}
+
+}  // namespace support
+}  // namespace confirmationui
+}  // namespace hardware
+}  // namespace android
diff --git a/confirmationui/support/src/confirmationui_utils.cpp b/confirmationui/support/src/confirmationui_utils.cpp
new file mode 100644
index 0000000..708f0d56
--- /dev/null
+++ b/confirmationui/support/src/confirmationui_utils.cpp
@@ -0,0 +1,39 @@
+/*
+**
+** Copyright 2017, The Android Open Source Project
+**
+** 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 <android/hardware/confirmationui/support/confirmationui_utils.h>
+
+namespace android {
+namespace hardware {
+namespace confirmationui {
+namespace support {
+
+bool operator==(const ByteBufferProxy& lhs, const ByteBufferProxy& rhs) {
+    if (lhs.size() == rhs.size()) {
+        auto lhsi = lhs.begin();
+        auto rhsi = rhs.begin();
+        while (lhsi != lhs.end()) {
+            if (*lhsi++ != *rhsi++) return false;
+        }
+    }
+    return true;
+}
+
+}  // namespace support
+}  // namespace confirmationui
+}  // namespace hardware
+}  // namespace android