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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/214823">214823</a></dd>
<dt>Author</dt> <dd>zandobersek@gmail.com</dd>
<dt>Date</dt> <dd>2017-04-03 11:36:03 -0700 (Mon, 03 Apr 2017)</dd>
</dl>
<h3>Log Message</h3>
<pre>[GCrypt] Implement AES_KW support
https://bugs.webkit.org/show_bug.cgi?id=170274
Reviewed by Michael Catanzaro.
Implement the CryptoAlgorithmAES_KW::platform{Wrap,Unwrap}Key()
functionality for configurations that use libgcrypt. This is done
by leveraging the gcry_cipher_* APIs for the AES algorithm that's
deducted appropriately from the key size and the AESWRAP cipher mode.
No new tests -- current ones cover this sufficiently, but are not yet
enabled due to other missing platform-specific SUBTLE_CRYPTO
implementations.
* crypto/gcrypt/CryptoAlgorithmAES_KWGCrypt.cpp:
(WebCore::gcryptWrapKey):
(WebCore::gcryptUnwrapKey):
(WebCore::CryptoAlgorithmAES_KW::platformWrapKey):
(WebCore::CryptoAlgorithmAES_KW::platformUnwrapKey):</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourceWebCoreChangeLog">trunk/Source/WebCore/ChangeLog</a></li>
<li><a href="#trunkSourceWebCorecryptogcryptCryptoAlgorithmAES_KWGCryptcpp">trunk/Source/WebCore/crypto/gcrypt/CryptoAlgorithmAES_KWGCrypt.cpp</a></li>
</ul>
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<h3>Diff</h3>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (214822 => 214823)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog 2017-04-03 18:12:38 UTC (rev 214822)
+++ trunk/Source/WebCore/ChangeLog 2017-04-03 18:36:03 UTC (rev 214823)
</span><span class="lines">@@ -1,5 +1,27 @@
</span><span class="cx"> 2017-04-03 Zan Dobersek <zdobersek@igalia.com>
</span><span class="cx">
</span><ins>+ [GCrypt] Implement AES_KW support
+ https://bugs.webkit.org/show_bug.cgi?id=170274
+
+ Reviewed by Michael Catanzaro.
+
+ Implement the CryptoAlgorithmAES_KW::platform{Wrap,Unwrap}Key()
+ functionality for configurations that use libgcrypt. This is done
+ by leveraging the gcry_cipher_* APIs for the AES algorithm that's
+ deducted appropriately from the key size and the AESWRAP cipher mode.
+
+ No new tests -- current ones cover this sufficiently, but are not yet
+ enabled due to other missing platform-specific SUBTLE_CRYPTO
+ implementations.
+
+ * crypto/gcrypt/CryptoAlgorithmAES_KWGCrypt.cpp:
+ (WebCore::gcryptWrapKey):
+ (WebCore::gcryptUnwrapKey):
+ (WebCore::CryptoAlgorithmAES_KW::platformWrapKey):
+ (WebCore::CryptoAlgorithmAES_KW::platformUnwrapKey):
+
+2017-04-03 Zan Dobersek <zdobersek@igalia.com>
+
</ins><span class="cx"> [GCrypt] Implement AES_GCM support
</span><span class="cx"> https://bugs.webkit.org/show_bug.cgi?id=170271
</span><span class="cx">
</span></span></pre></div>
<a id="trunkSourceWebCorecryptogcryptCryptoAlgorithmAES_KWGCryptcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/crypto/gcrypt/CryptoAlgorithmAES_KWGCrypt.cpp (214822 => 214823)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/crypto/gcrypt/CryptoAlgorithmAES_KWGCrypt.cpp 2017-04-03 18:12:38 UTC (rev 214822)
+++ trunk/Source/WebCore/crypto/gcrypt/CryptoAlgorithmAES_KWGCrypt.cpp 2017-04-03 18:36:03 UTC (rev 214823)
</span><span class="lines">@@ -1,5 +1,6 @@
</span><span class="cx"> /*
</span><del>- * Copyright (C) 2014 Igalia S.L. All rights reserved.
</del><ins>+ * Copyright (C) 2017 Metrological Group B.V.
+ * Copyright (C) 2017 Igalia S.L.
</ins><span class="cx"> *
</span><span class="cx"> * Redistribution and use in source and binary forms, with or without
</span><span class="cx"> * modification, are permitted provided that the following conditions
</span><span class="lines">@@ -28,21 +29,110 @@
</span><span class="cx">
</span><span class="cx"> #if ENABLE(SUBTLE_CRYPTO)
</span><span class="cx">
</span><ins>+#include "CryptoKeyAES.h"
</ins><span class="cx"> #include "ExceptionCode.h"
</span><span class="cx"> #include "NotImplemented.h"
</span><ins>+#include <pal/crypto/gcrypt/Handle.h>
+#include <pal/crypto/gcrypt/Utilities.h>
</ins><span class="cx">
</span><span class="cx"> namespace WebCore {
</span><span class="cx">
</span><del>-void CryptoAlgorithmAES_KW::platformWrapKey(Ref<CryptoKey>&&, Vector<uint8_t>&&, VectorCallback&&, ExceptionCallback&&)
</del><ins>+static std::optional<Vector<uint8_t>> gcryptWrapKey(const Vector<uint8_t>& key, const Vector<uint8_t>& data)
</ins><span class="cx"> {
</span><del>- notImplemented();
</del><ins>+ auto algorithm = PAL::GCrypt::aesAlgorithmForKeySize(key.size() * 8);
+ if (!algorithm)
+ return std::nullopt;
+
+ PAL::GCrypt::Handle<gcry_cipher_hd_t> handle;
+ gcry_error_t error = gcry_cipher_open(&handle, *algorithm, GCRY_CIPHER_MODE_AESWRAP, 0);
+ if (error != GPG_ERR_NO_ERROR) {
+ PAL::GCrypt::logError(error);
+ return std::nullopt;
+ }
+
+ error = gcry_cipher_setkey(handle, key.data(), key.size());
+ if (error != GPG_ERR_NO_ERROR) {
+ PAL::GCrypt::logError(error);
+ return std::nullopt;
+ }
+
+ error = gcry_cipher_final(handle);
+ if (error != GPG_ERR_NO_ERROR) {
+ PAL::GCrypt::logError(error);
+ return std::nullopt;
+ }
+
+ // On encryption the provided output buffer must be 64 bit (8 byte) larger than the input buffer.
+ Vector<uint8_t> output(data.size() + 8);
+ error = gcry_cipher_encrypt(handle, output.data(), output.size(), data.data(), data.size());
+ if (error != GPG_ERR_NO_ERROR) {
+ PAL::GCrypt::logError(error);
+ return std::nullopt;
+ }
+
+ return output;
</ins><span class="cx"> }
</span><span class="cx">
</span><del>-void CryptoAlgorithmAES_KW::platformUnwrapKey(Ref<CryptoKey>&&, Vector<uint8_t>&&, VectorCallback&&, ExceptionCallback&&)
</del><ins>+static std::optional<Vector<uint8_t>> gcryptUnwrapKey(const Vector<uint8_t>& key, const Vector<uint8_t>& data)
</ins><span class="cx"> {
</span><del>- notImplemented();
</del><ins>+ auto algorithm = PAL::GCrypt::aesAlgorithmForKeySize(key.size() * 8);
+ if (!algorithm)
+ return std::nullopt;
+
+ PAL::GCrypt::Handle<gcry_cipher_hd_t> handle;
+ gcry_error_t error = gcry_cipher_open(&handle, *algorithm, GCRY_CIPHER_MODE_AESWRAP, 0);
+ if (error != GPG_ERR_NO_ERROR) {
+ PAL::GCrypt::logError(error);
+ return std::nullopt;
+ }
+
+ error = gcry_cipher_setkey(handle, key.data(), key.size());
+ if (error != GPG_ERR_NO_ERROR) {
+ PAL::GCrypt::logError(error);
+ return std::nullopt;
+ }
+
+ error = gcry_cipher_final(handle);
+ if (error != GPG_ERR_NO_ERROR) {
+ PAL::GCrypt::logError(error);
+ return std::nullopt;
+ }
+
+ // On decryption the output buffer may be specified 64 bit (8 byte) shorter than then input buffer.
+ Vector<uint8_t> output(data.size() - 8);
+ error = gcry_cipher_decrypt(handle, output.data(), output.size(), data.data(), data.size());
+ if (error != GPG_ERR_NO_ERROR) {
+ PAL::GCrypt::logError(error);
+ return std::nullopt;
+ }
+
+ return output;
</ins><span class="cx"> }
</span><span class="cx">
</span><ins>+void CryptoAlgorithmAES_KW::platformWrapKey(Ref<CryptoKey>&& key, Vector<uint8_t>&& data, VectorCallback&& callback, ExceptionCallback&& exceptionCallback)
+{
+ auto& aesKey = downcast<CryptoKeyAES>(key.get());
+ auto output = gcryptWrapKey(aesKey.key(), data);
+ if (!output) {
+ exceptionCallback(OperationError);
+ return;
+ }
+
+ callback(*output);
+}
+
+void CryptoAlgorithmAES_KW::platformUnwrapKey(Ref<CryptoKey>&& key, Vector<uint8_t>&& data, VectorCallback&& callback, ExceptionCallback&& exceptionCallback)
+{
+ auto& aesKey = downcast<CryptoKeyAES>(key.get());
+ auto output = gcryptUnwrapKey(aesKey.key(), data);
+ if (!output) {
+ exceptionCallback(OperationError);
+ return;
+ }
+
+ callback(*output);
+}
+
</ins><span class="cx"> ExceptionOr<void> CryptoAlgorithmAES_KW::platformEncrypt(const CryptoKeyAES&, const CryptoOperationData&, VectorCallback&&, VoidCallback&&)
</span><span class="cx"> {
</span><span class="cx"> notImplemented();
</span></span></pre>
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