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diff --git a/nss/lib/freebl/chacha20poly1305.h b/nss/lib/freebl/chacha20poly1305.h
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef _CHACHA20_POLY1305_H_
+#define _CHACHA20_POLY1305_H_ 1
+
+/* ChaCha20Poly1305ContextStr saves the key and tag length for a
+ * ChaCha20+Poly1305 AEAD operation. */
+struct ChaCha20Poly1305ContextStr {
+ unsigned char key[32];
+ unsigned char tagLen;
+};
+
+#endif /* _CHACHA20_POLY1305_H_ */