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diff --git a/comm/third_party/libotr/src/b64.h b/comm/third_party/libotr/src/b64.h
new file mode 100644
index 0000000000..bdd584a45e
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+++ b/comm/third_party/libotr/src/b64.h
@@ -0,0 +1,72 @@
+/*
+ *  Off-the-Record Messaging library
+ *  Copyright (C) 2004-2012  Ian Goldberg, Chris Alexander, Willy Lew,
+ *  			     Nikita Borisov
+ *                           <otr@cypherpunks.ca>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of version 2.1 of the GNU Lesser General
+ *  Public License as published by the Free Software Foundation.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef __B64_H__
+#define __B64_H__
+
+#include <stdlib.h>
+
+/* Base64 encodes blocks of this many bytes: */
+#define OTRL_B64_DECODED_LEN 3
+/* into blocks of this many bytes: */
+#define OTRL_B64_ENCODED_LEN 4
+
+/* An encoded block of length encoded_len can turn into a maximum of
+ * this many decoded bytes: */
+#define OTRL_B64_MAX_DECODED_SIZE(encoded_len) \
+    (((encoded_len + OTRL_B64_ENCODED_LEN - 1) / OTRL_B64_ENCODED_LEN) \
+	* OTRL_B64_DECODED_LEN)
+
+/*
+ * base64 encode data.  Insert no linebreaks or whitespace.
+ *
+ * The buffer base64data must contain at least ((datalen+2)/3)*4 bytes of
+ * space.  This function will return the number of bytes actually used.
+ */
+size_t otrl_base64_encode(char *base64data, const unsigned char *data,
+	size_t datalen);
+
+/*
+ * base64 decode data.  Skip non-base64 chars, and terminate at the
+ * first '=', or the end of the buffer.
+ *
+ * The buffer data must contain at least ((base64len+3) / 4) * 3 bytes
+ * of space.  This function will return the number of bytes actually
+ * used.
+ */
+size_t otrl_base64_decode(unsigned char *data, const char *base64data,
+	size_t base64len);
+
+/*
+ * Base64-encode a block of data, stick "?OTR:" and "." around it, and
+ * return the result, or NULL in the event of a memory error.
+ */
+char *otrl_base64_otr_encode(const unsigned char *buf, size_t buflen);
+
+/*
+ * Base64-decode the portion of the given message between "?OTR:" and
+ * ".".  Set *bufp to the decoded data, and set *lenp to its length.
+ * The caller must free() the result.  Return 0 on success, -1 on a
+ * memory error, or -2 on invalid input.
+ */
+int otrl_base64_otr_decode(const char *msg, unsigned char **bufp,
+	size_t *lenp);
+
+#endif