Add a big fat warning to crypto_stream*

src/libsodium/include/sodium/crypto_stream.h

@@ -1,6 +1,14 @@
 #ifndef crypto_stream_H
 #define crypto_stream_H
 
+/*
+ *  WARNING: This is just a stream cipher. It is NOT authenticated encryption.
+ *  While it provides some protection against eavesdropping, it does NOT
+ *  provide any security against active attacks.
+ *  Unless you know what you're doing, what you are looking for is probably
+ *  the crypto_box functions.
+ */
+
 #include <stdlib.h>
 
 #include "crypto_stream_xsalsa20.h"

src/libsodium/include/sodium/crypto_stream_aes128ctr.h

@@ -1,6 +1,14 @@
 #ifndef crypto_stream_aes128ctr_H
 #define crypto_stream_aes128ctr_H
 
+/*
+ *  WARNING: This is just a stream cipher. It is NOT authenticated encryption.
+ *  While it provides some protection against eavesdropping, it does NOT
+ *  provide any security against active attacks.
+ *  Unless you know what you're doing, what you are looking for is probably
+ *  the crypto_box functions.
+ */
+
 #include "export.h"
 
 #define crypto_stream_aes128ctr_KEYBYTES 16
@@ -11,7 +19,6 @@
 extern "C" {
 #endif
 
-
 SODIUM_EXPORT
 int crypto_stream_aes128ctr(unsigned char *,unsigned long long,const unsigned char *,const unsigned char *);
 

src/libsodium/include/sodium/crypto_stream_salsa20.h

@@ -1,6 +1,14 @@
 #ifndef crypto_stream_salsa20_H
 #define crypto_stream_salsa20_H
 
+/*
+ *  WARNING: This is just a stream cipher. It is NOT authenticated encryption.
+ *  While it provides some protection against eavesdropping, it does NOT
+ *  provide any security against active attacks.
+ *  Unless you know what you're doing, what you are looking for is probably
+ *  the crypto_box functions.
+ */
+
 #include "export.h"
 
 #define crypto_stream_salsa20_KEYBYTES 32

src/libsodium/include/sodium/crypto_stream_salsa2012.h

@@ -1,6 +1,14 @@
 #ifndef crypto_stream_salsa2012_H
 #define crypto_stream_salsa2012_H
 
+/*
+ *  WARNING: This is just a stream cipher. It is NOT authenticated encryption.
+ *  While it provides some protection against eavesdropping, it does NOT
+ *  provide any security against active attacks.
+ *  Unless you know what you're doing, what you are looking for is probably
+ *  the crypto_box functions.
+ */
+
 #include "export.h"
 
 #define crypto_stream_salsa2012_KEYBYTES 32

src/libsodium/include/sodium/crypto_stream_salsa208.h

@@ -1,6 +1,14 @@
 #ifndef crypto_stream_salsa208_H
 #define crypto_stream_salsa208_H
 
+/*
+ *  WARNING: This is just a stream cipher. It is NOT authenticated encryption.
+ *  While it provides some protection against eavesdropping, it does NOT
+ *  provide any security against active attacks.
+ *  Unless you know what you're doing, what you are looking for is probably
+ *  the crypto_box functions.
+ */
+
 #include "export.h"
 
 #define crypto_stream_salsa208_KEYBYTES 32

src/libsodium/include/sodium/crypto_stream_xsalsa20.h

@@ -1,6 +1,14 @@
 #ifndef crypto_stream_xsalsa20_H
 #define crypto_stream_xsalsa20_H
 
+/*
+ *  WARNING: This is just a stream cipher. It is NOT authenticated encryption.
+ *  While it provides some protection against eavesdropping, it does NOT
+ *  provide any security against active attacks.
+ *  Unless you know what you're doing, what you are looking for is probably
+ *  the crypto_box functions.
+ */
+
 #include "export.h"
 
 #define crypto_stream_xsalsa20_KEYBYTES 32