diff --git a/src/libsodium/crypto_stream/crypto_stream.c b/src/libsodium/crypto_stream/crypto_stream.c
index 8a5f5720..50a9c1c0 100644
--- a/src/libsodium/crypto_stream/crypto_stream.c
+++ b/src/libsodium/crypto_stream/crypto_stream.c
@@ -1,6 +1,24 @@
 
 #include "crypto_stream.h"
 
+size_t
+crypto_stream_keybytes(void)
+{
+    return crypto_stream_KEYBYTES;
+}
+
+size_t
+crypto_stream_noncebytes(void)
+{
+    return crypto_stream_NONCEBYTES;
+}
+
+const char *
+crypto_stream_primitive(void)
+{
+    return crypto_stream_PRIMITIVE;
+}
+
 int
 crypto_stream(unsigned char *c, unsigned long long clen,
               const unsigned char *n, const unsigned char *k)
diff --git a/src/libsodium/include/sodium/crypto_stream.h b/src/libsodium/include/sodium/crypto_stream.h
index 8890122f..6c6d9ac9 100644
--- a/src/libsodium/include/sodium/crypto_stream.h
+++ b/src/libsodium/include/sodium/crypto_stream.h
@@ -1,16 +1,23 @@
 #ifndef crypto_stream_H
 #define crypto_stream_H
 
-#include "crypto_stream_xsalsa20.h"
+#include <stdlib.h>
 
-#define crypto_stream_KEYBYTES crypto_stream_xsalsa20_KEYBYTES
-#define crypto_stream_NONCEBYTES crypto_stream_xsalsa20_NONCEBYTES
-#define crypto_stream_PRIMITIVE "xsalsa20"
+#include "crypto_stream_xsalsa20.h"
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
+#define crypto_stream_KEYBYTES crypto_stream_xsalsa20_KEYBYTES
+size_t  crypto_stream_keybytes(void);
+
+#define crypto_stream_NONCEBYTES crypto_stream_xsalsa20_NONCEBYTES
+size_t  crypto_stream_noncebytes(void);
+
+#define crypto_stream_PRIMITIVE "xsalsa20"
+const char *crypto_stream_primitive(void);
+
 int crypto_stream(unsigned char *c, unsigned long long clen,
                   const unsigned char *n, const unsigned char *k);