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diff --git a/src/librepgp/stream-def.h b/src/librepgp/stream-def.h
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+++ b/src/librepgp/stream-def.h
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+/*
+ * Copyright (c) 2017-2020, [Ribose Inc](https://www.ribose.com).
+ * 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT OWNER OR 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.
+ */
+
+#ifndef STREAM_DEF_H_
+#define STREAM_DEF_H_
+
+#define CT_BUF_LEN 4096
+#define CH_CR ('\r')
+#define CH_LF ('\n')
+#define CH_EQ ('=')
+#define CH_DASH ('-')
+#define CH_SPACE (' ')
+#define CH_TAB ('\t')
+#define CH_COMMA (',')
+#define ST_CR ("\r")
+#define ST_LF ("\n")
+#define ST_CRLF ("\r\n")
+#define ST_CRLFCRLF ("\r\n\r\n")
+#define ST_DASHSP ("- ")
+#define ST_COMMA (",")
+
+#define ST_DASHES ("-----")
+#define ST_ARMOR_BEGIN ("-----BEGIN PGP ")
+#define ST_ARMOR_END ("-----END PGP ")
+#define ST_CLEAR_BEGIN ("-----BEGIN PGP SIGNED MESSAGE-----")
+#define ST_SIG_BEGIN ("\n-----BEGIN PGP SIGNATURE-----")
+#define ST_HEADER_VERSION ("Version: ")
+#define ST_HEADER_COMMENT ("Comment: ")
+#define ST_HEADER_HASH ("Hash: ")
+#define ST_HEADER_CHARSET ("Charset: ")
+#define ST_FROM ("From")
+
+/* Preallocated cache length for AEAD encryption/decryption */
+#define PGP_AEAD_CACHE_LEN (PGP_INPUT_CACHE_SIZE + PGP_AEAD_MAX_TAG_LEN)
+
+/* Maximum OpenPGP packet nesting level */
+#define MAXIMUM_NESTING_LEVEL 32
+#define MAXIMUM_STREAM_PKTS 16
+#define MAXIMUM_ERROR_PKTS 64
+
+/* Maximum text line length supported by GnuPG */
+#define MAXIMUM_GNUPG_LINELEN 19995
+
+#endif /* !STREAM_DEF_H_ */