1 files changed, 77 insertions, 0 deletions
diff --git a/src/bun.js/bindings/webcrypto/CommonCryptoDERUtilities.cpp b/src/bun.js/bindings/webcrypto/CommonCryptoDERUtilities.cpp
new file mode 100644
index 000000000..d0fb25b74
--- /dev/null
+++ b/src/bun.js/bindings/webcrypto/CommonCryptoDERUtilities.cpp
@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2017 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 "CommonCryptoDERUtilities.h"
+
+#if ENABLE(WEB_CRYPTO)
+
+namespace WebCore {
+
+size_t bytesUsedToEncodedLength(uint8_t octet)
+{
+    if (octet < MaxLengthInOneByte)
+        return 1;
+    return octet - MaxLengthInOneByte + 1;
+}
+
+size_t extraBytesNeededForEncodedLength(size_t length)
+{
+    if (!length)
+        return 0;
+    size_t result = 1;
+    while (result < sizeof(length) && length >= (1 << (result * 8)))
+        result += 1;
+    return result;
+}
+
+void addEncodedASN1Length(Vector<uint8_t>& in, size_t length)
+{
+    if (length < MaxLengthInOneByte) {
+        in.append(length);
+        return;
+    }
+
+    size_t extraBytes = extraBytesNeededForEncodedLength(length);
+    in.append(128 + extraBytes); // 128 is used to set the first bit of this byte.
+
+    size_t lastPosition = in.size() + extraBytes - 1;
+    in.grow(in.size() + extraBytes);
+    for (size_t i = 0; i < extraBytes; i++) {
+        in[lastPosition - i] = length & 0xff;
+        length = length >> 8;
+    }
+}
+
+size_t bytesNeededForEncodedLength(size_t length)
+{
+    if (length < MaxLengthInOneByte)
+        return 1;
+    return 1 + extraBytesNeededForEncodedLength(length);
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(WEB_CRYPTO)