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diff --git a/Source/WebCore/crypto/CommonCryptoUtilities.cpp b/Source/WebCore/crypto/CommonCryptoUtilities.cpp
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index 000000000..6d4668ef2
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+++ b/Source/WebCore/crypto/CommonCryptoUtilities.cpp
@@ -0,0 +1,173 @@
+/*
+ * Copyright (C) 2013 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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.
+ */
+
+#include "config.h"
+#include "CommonCryptoUtilities.h"
+
+#if ENABLE(SUBTLE_CRYPTO)
+
+#if USE(APPLE_INTERNAL_SDK)
+#include <CommonCrypto/CommonBigNum.h>
+#endif
+
+typedef CCCryptorStatus CCStatus;
+extern "C" CCBigNumRef CCBigNumFromData(CCStatus *status, const void *s, size_t len);
+extern "C" size_t CCBigNumToData(CCStatus *status, const CCBigNumRef bn, void *to);
+extern "C" uint32_t CCBigNumByteCount(const CCBigNumRef bn);
+extern "C" CCBigNumRef CCCreateBigNum(CCStatus *status);
+extern "C" void CCBigNumFree(CCBigNumRef bn);
+extern "C" CCBigNumRef CCBigNumCopy(CCStatus *status, const CCBigNumRef bn);
+extern "C" CCStatus CCBigNumSubI(CCBigNumRef result, const CCBigNumRef a, const uint32_t b);
+extern "C" CCStatus CCBigNumMod(CCBigNumRef result, CCBigNumRef dividend, CCBigNumRef modulus);
+extern "C" CCStatus CCBigNumInverseMod(CCBigNumRef result, const CCBigNumRef a, const CCBigNumRef modulus);
+
+namespace WebCore {
+
+bool getCommonCryptoDigestAlgorithm(CryptoAlgorithmIdentifier hashFunction, CCDigestAlgorithm& algorithm)
+{
+    switch (hashFunction) {
+    case CryptoAlgorithmIdentifier::SHA_1:
+        algorithm = kCCDigestSHA1;
+        return true;
+    case CryptoAlgorithmIdentifier::SHA_224:
+        algorithm = kCCDigestSHA224;
+        return true;
+    case CryptoAlgorithmIdentifier::SHA_256:
+        algorithm = kCCDigestSHA256;
+        return true;
+    case CryptoAlgorithmIdentifier::SHA_384:
+        algorithm = kCCDigestSHA384;
+        return true;
+    case CryptoAlgorithmIdentifier::SHA_512:
+        algorithm = kCCDigestSHA512;
+        return true;
+    default:
+        return false;
+    }
+}
+
+CCBigNum::CCBigNum(CCBigNumRef number)
+    : m_number(number)
+{
+}
+
+CCBigNum::CCBigNum(const uint8_t* data, size_t size)
+{
+    CCStatus status = kCCSuccess;
+    m_number = CCBigNumFromData(&status, data, size);
+    RELEASE_ASSERT(!status);
+}
+
+CCBigNum::~CCBigNum()
+{
+    CCBigNumFree(m_number);
+}
+
+CCBigNum::CCBigNum(const CCBigNum& other)
+{
+    CCStatus status = kCCSuccess;
+    m_number = CCBigNumCopy(&status, other.m_number);
+    RELEASE_ASSERT(!status);
+}
+
+CCBigNum::CCBigNum(CCBigNum&& other)
+{
+    m_number = other.m_number;
+    other.m_number = nullptr;
+}
+
+CCBigNum& CCBigNum::operator=(const CCBigNum& other)
+{
+    if (this == &other)
+        return *this;
+
+    CCBigNumFree(m_number);
+
+    CCStatus status = kCCSuccess;
+    m_number = CCBigNumCopy(&status, other.m_number);
+    RELEASE_ASSERT(!status);
+    return *this;
+}
+
+CCBigNum& CCBigNum::operator=(CCBigNum&& other)
+{
+    if (this == &other)
+        return *this;
+
+    m_number = other.m_number;
+    other.m_number = nullptr;
+
+    return *this;
+}
+
+Vector<uint8_t> CCBigNum::data() const
+{
+    Vector<uint8_t> result(CCBigNumByteCount(m_number));
+    CCStatus status = kCCSuccess;
+    CCBigNumToData(&status, m_number, result.data());
+    RELEASE_ASSERT(!status);
+
+    return result;
+}
+
+CCBigNum CCBigNum::operator-(uint32_t b) const
+{
+    CCStatus status = kCCSuccess;
+    CCBigNumRef result = CCCreateBigNum(&status);
+    RELEASE_ASSERT(!status);
+
+    status = CCBigNumSubI(result, m_number, b);
+    RELEASE_ASSERT(!status);
+
+    return result;
+}
+
+CCBigNum CCBigNum::operator%(const CCBigNum& modulus) const
+{
+    CCStatus status = kCCSuccess;
+    CCBigNumRef result = CCCreateBigNum(&status);
+    RELEASE_ASSERT(!status);
+
+    status = CCBigNumMod(result, m_number, modulus.m_number);
+    RELEASE_ASSERT(!status);
+
+    return result;
+}
+
+CCBigNum CCBigNum::inverse(const CCBigNum& modulus) const
+{
+    CCStatus status = kCCSuccess;
+    CCBigNumRef result = CCCreateBigNum(&status);
+    RELEASE_ASSERT(!status);
+
+    status = CCBigNumInverseMod(result, m_number, modulus.m_number);
+    RELEASE_ASSERT(!status);
+
+    return result;
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(SUBTLE_CRYPTO)