1 files changed, 184 insertions, 0 deletions
diff --git a/src/bun.js/bindings/webcrypto/CryptoAlgorithmAES_GCMOpenSSL.cpp b/src/bun.js/bindings/webcrypto/CryptoAlgorithmAES_GCMOpenSSL.cpp
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index 000000000..0117524c8
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+++ b/src/bun.js/bindings/webcrypto/CryptoAlgorithmAES_GCMOpenSSL.cpp
@@ -0,0 +1,184 @@
+/*
+ * Copyright (C) 2020 Sony Interactive Entertainment Inc.
+ *
+ * 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 "CryptoAlgorithmAES_GCM.h"
+
+#if ENABLE(WEB_CRYPTO)
+
+#include "CryptoAlgorithmAesGcmParams.h"
+#include "CryptoKeyAES.h"
+#include "OpenSSLCryptoUniquePtr.h"
+#include <openssl/evp.h>
+
+namespace WebCore {
+
+static const EVP_CIPHER* aesAlgorithm(size_t keySize)
+{
+    if (keySize * 8 == 128)
+        return EVP_aes_128_gcm();
+
+    if (keySize * 8 == 192)
+        return EVP_aes_192_gcm();
+
+    if (keySize * 8 == 256)
+        return EVP_aes_256_gcm();
+
+    return nullptr;
+}
+
+static std::optional<Vector<uint8_t>> cryptEncrypt(const Vector<uint8_t>& key, const Vector<uint8_t>& iv, const Vector<uint8_t>& plainText, const Vector<uint8_t>& additionalData, uint8_t tagLength)
+{
+    const EVP_CIPHER* algorithm = aesAlgorithm(key.size());
+    if (!algorithm)
+        return std::nullopt;
+
+    EvpCipherCtxPtr ctx;
+    int len;
+
+    Vector<uint8_t> cipherText(plainText.size() + tagLength);
+    size_t tagOffset = plainText.size();
+
+    // Create and initialize the context
+    if (!(ctx = EvpCipherCtxPtr(EVP_CIPHER_CTX_new())))
+        return std::nullopt;
+
+    // Disable padding
+    if (1 != EVP_CIPHER_CTX_set_padding(ctx.get(), 0))
+        return std::nullopt;
+
+    // Initialize the encryption operation
+    if (1 != EVP_EncryptInit_ex(ctx.get(), algorithm, nullptr, nullptr, nullptr))
+        return std::nullopt;
+
+    // Set IV length
+    if (1 != EVP_CIPHER_CTX_ctrl(ctx.get(), EVP_CTRL_GCM_SET_IVLEN, iv.size(), nullptr))
+        return std::nullopt;
+
+    // Initialize key and IV
+    if (1 != EVP_EncryptInit_ex(ctx.get(), nullptr, nullptr, key.data(), iv.data()))
+        return std::nullopt;
+
+    // Provide any AAD data
+    if (additionalData.size() > 0) {
+        if (1 != EVP_EncryptUpdate(ctx.get(), nullptr, &len, additionalData.data(), additionalData.size()))
+            return std::nullopt;
+    }
+
+    // Provide the message to be encrypted, and obtain the encrypted output
+    if (1 != EVP_EncryptUpdate(ctx.get(), cipherText.data(), &len, plainText.data(), plainText.size()))
+        return std::nullopt;
+
+    // Finalize the encryption. Normally ciphertext bytes may be written at
+    // this stage, but this does not occur in GCM mode
+    if (1 != EVP_EncryptFinal_ex(ctx.get(), cipherText.data() + len, &len))
+        return std::nullopt;
+
+    // Get the tag
+    if (1 != EVP_CIPHER_CTX_ctrl(ctx.get(), EVP_CTRL_GCM_GET_TAG, tagLength, cipherText.data() + tagOffset))
+        return std::nullopt;
+
+    return cipherText;
+}
+
+static std::optional<Vector<uint8_t>> cryptDecrypt(const Vector<uint8_t>& key, const Vector<uint8_t>& iv, const Vector<uint8_t>& cipherText, const Vector<uint8_t>& additionalData, uint8_t tagLength)
+{
+    const EVP_CIPHER* algorithm = aesAlgorithm(key.size());
+    if (!algorithm)
+        return std::nullopt;
+
+    EvpCipherCtxPtr ctx;
+    int len;
+    int plainTextLen;
+    int cipherTextLen = cipherText.size() - tagLength;
+
+    Vector<uint8_t> plainText(cipherText.size());
+    Vector<uint8_t> tag { cipherText.data() + cipherTextLen, tagLength };
+
+    // Create and initialize the context
+    if (!(ctx = EvpCipherCtxPtr(EVP_CIPHER_CTX_new())))
+        return std::nullopt;
+
+    // Disable padding
+    if (1 != EVP_CIPHER_CTX_set_padding(ctx.get(), 0))
+        return std::nullopt;
+
+    // Initialize the encryption operation
+    if (1 != EVP_DecryptInit_ex(ctx.get(), algorithm, nullptr, nullptr, nullptr))
+        return std::nullopt;
+
+    // Set IV length
+    if (1 != EVP_CIPHER_CTX_ctrl(ctx.get(), EVP_CTRL_GCM_SET_IVLEN, iv.size(), nullptr))
+        return std::nullopt;
+
+    // Initialize key and IV
+    if (1 != EVP_DecryptInit_ex(ctx.get(), nullptr, nullptr, key.data(), iv.data()))
+        return std::nullopt;
+
+    // Provide any AAD data
+    if (additionalData.size() > 0) {
+        if (1 != EVP_DecryptUpdate(ctx.get(), nullptr, &len, additionalData.data(), additionalData.size()))
+            return std::nullopt;
+    }
+
+    // Set expected tag value
+    if (1 != EVP_CIPHER_CTX_ctrl(ctx.get(), EVP_CTRL_GCM_SET_TAG, tag.size(), tag.data()))
+        return std::nullopt;
+
+    // Provide the message to be encrypted, and obtain the encrypted output
+    if (1 != EVP_DecryptUpdate(ctx.get(), plainText.data(), &len, cipherText.data(), cipherTextLen))
+        return std::nullopt;
+    plainTextLen = len;
+
+    // Finalize the decryption
+    if (1 != EVP_DecryptFinal_ex(ctx.get(), plainText.data() + len, &len))
+        return std::nullopt;
+
+    plainTextLen += len;
+
+    plainText.shrink(plainTextLen);
+
+    return plainText;
+}
+
+ExceptionOr<Vector<uint8_t>> CryptoAlgorithmAES_GCM::platformEncrypt(const CryptoAlgorithmAesGcmParams& parameters, const CryptoKeyAES& key, const Vector<uint8_t>& plainText)
+{
+    auto output = cryptEncrypt(key.key(), parameters.ivVector(), plainText, parameters.additionalDataVector(), parameters.tagLength.value_or(0) / 8);
+    if (!output)
+        return Exception { OperationError };
+    return WTFMove(*output);
+}
+
+ExceptionOr<Vector<uint8_t>> CryptoAlgorithmAES_GCM::platformDecrypt(const CryptoAlgorithmAesGcmParams& parameters, const CryptoKeyAES& key, const Vector<uint8_t>& cipherText)
+{
+    auto output = cryptDecrypt(key.key(), parameters.ivVector(), cipherText, parameters.additionalDataVector(), parameters.tagLength.value_or(0) / 8);
+    if (!output)
+        return Exception { OperationError };
+    return WTFMove(*output);
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(WEB_CRYPTO)