diff --git a/src/libsodium/Makefile.am b/src/libsodium/Makefile.am
index f59e0e84..87e01b28 100644
--- a/src/libsodium/Makefile.am
+++ b/src/libsodium/Makefile.am
@@ -175,6 +175,8 @@ libsodium_la_SOURCES += \
 	crypto_core/salsa2012/core_salsa2012_api.c \
 	crypto_core/salsa208/ref/core_salsa208.c \
 	crypto_core/salsa208/core_salsa208_api.c \
+	crypto_secretbox/xchacha20poly1305/secretbox_xchacha20poly1305_api.c \
+	crypto_secretbox/xchacha20poly1305/sodium/box_xchacha20poly1305.c \
 	crypto_sign/ed25519/ref10/obsolete.c \
 	crypto_stream/aes128ctr/portable/afternm_aes128ctr.c \
 	crypto_stream/aes128ctr/stream_aes128ctr_api.c \
diff --git a/src/libsodium/crypto_secretbox/xchacha20poly1305/secretbox_xchacha20poly1305_api.c b/src/libsodium/crypto_secretbox/xchacha20poly1305/secretbox_xchacha20poly1305_api.c
new file mode 100644
index 00000000..f8a9958c
--- /dev/null
+++ b/src/libsodium/crypto_secretbox/xchacha20poly1305/secretbox_xchacha20poly1305_api.c
@@ -0,0 +1,31 @@
+#include "crypto_secretbox_xchacha20poly1305.h"
+
+size_t
+crypto_secretbox_xchacha20poly1305_keybytes(void)
+{
+    return crypto_secretbox_xchacha20poly1305_KEYBYTES;
+}
+
+size_t
+crypto_secretbox_xchacha20poly1305_noncebytes(void)
+{
+    return crypto_secretbox_xchacha20poly1305_NONCEBYTES;
+}
+
+size_t
+crypto_secretbox_xchacha20poly1305_zerobytes(void)
+{
+    return crypto_secretbox_xchacha20poly1305_ZEROBYTES;
+}
+
+size_t
+crypto_secretbox_xchacha20poly1305_boxzerobytes(void)
+{
+    return crypto_secretbox_xchacha20poly1305_BOXZEROBYTES;
+}
+
+size_t
+crypto_secretbox_xchacha20poly1305_macbytes(void)
+{
+    return crypto_secretbox_xchacha20poly1305_MACBYTES;
+}
diff --git a/src/libsodium/crypto_secretbox/xchacha20poly1305/sodium/box_xchacha20poly1305.c b/src/libsodium/crypto_secretbox/xchacha20poly1305/sodium/box_xchacha20poly1305.c
new file mode 100644
index 00000000..e5480ca8
--- /dev/null
+++ b/src/libsodium/crypto_secretbox/xchacha20poly1305/sodium/box_xchacha20poly1305.c
@@ -0,0 +1,46 @@
+#include "crypto_onetimeauth_poly1305.h"
+#include "crypto_secretbox_xchacha20poly1305.h"
+#include "crypto_stream_xchacha20.h"
+
+int
+crypto_secretbox_xchacha20poly1305(unsigned char *c, const unsigned char *m,
+                                   unsigned long long mlen,
+                                   const unsigned char *n,
+                                   const unsigned char *k)
+{
+    int i;
+
+    if (mlen < 32) {
+        return -1;
+    }
+    crypto_stream_xchacha20_xor(c, m, mlen, n, k);
+    crypto_onetimeauth_poly1305(c + 16, c + 32, mlen - 32, c);
+    for (i = 0; i < 16; ++i) {
+        c[i] = 0;
+    }
+    return 0;
+}
+
+int
+crypto_secretbox_xchacha20poly1305_open(unsigned char *m, const unsigned char *c,
+                                        unsigned long long clen,
+                                        const unsigned char *n,
+                                        const unsigned char *k)
+{
+    unsigned char subkey[32];
+    int           i;
+
+    if (clen < 32) {
+        return -1;
+    }
+    crypto_stream_xchacha20(subkey, 32, n, k);
+    if (crypto_onetimeauth_poly1305_verify(c + 16, c + 32,
+                                           clen - 32, subkey) != 0) {
+        return -1;
+    }
+    crypto_stream_xchacha20_xor(m, c, clen, n, k);
+    for (i = 0; i < 32; ++i) {
+        m[i] = 0;
+    }
+    return 0;
+}
diff --git a/src/libsodium/include/Makefile.am b/src/libsodium/include/Makefile.am
index 4cb58c8e..3d062ffe 100644
--- a/src/libsodium/include/Makefile.am
+++ b/src/libsodium/include/Makefile.am
@@ -28,6 +28,7 @@ SODIUM_EXPORT = \
 	sodium/crypto_scalarmult.h \
 	sodium/crypto_scalarmult_curve25519.h \
 	sodium/crypto_secretbox.h \
+	sodium/crypto_secretbox_xchacha20poly1305.h \
 	sodium/crypto_secretbox_xsalsa20poly1305.h \
 	sodium/crypto_shorthash.h \
 	sodium/crypto_shorthash_siphash24.h \
diff --git a/src/libsodium/include/sodium.h b/src/libsodium/include/sodium.h
index 9fbbf99e..b7388ad0 100644
--- a/src/libsodium/include/sodium.h
+++ b/src/libsodium/include/sodium.h
@@ -30,6 +30,7 @@
 #include "sodium/crypto_scalarmult_curve25519.h"
 #include "sodium/crypto_secretbox.h"
 #include "sodium/crypto_secretbox_xsalsa20poly1305.h"
+#include "sodium/crypto_secretbox_xchacha20poly1305.h"
 #include "sodium/crypto_shorthash.h"
 #include "sodium/crypto_shorthash_siphash24.h"
 #include "sodium/crypto_sign.h"
diff --git a/src/libsodium/include/sodium/crypto_secretbox_xchacha20poly1305.h b/src/libsodium/include/sodium/crypto_secretbox_xchacha20poly1305.h
new file mode 100644
index 00000000..3129cd1f
--- /dev/null
+++ b/src/libsodium/include/sodium/crypto_secretbox_xchacha20poly1305.h
@@ -0,0 +1,54 @@
+#ifndef crypto_secretbox_xchacha20poly1305_H
+#define crypto_secretbox_xchacha20poly1305_H
+
+#include <stddef.h>
+#include "export.h"
+
+#ifdef __cplusplus
+# ifdef __GNUC__
+#  pragma GCC diagnostic ignored "-Wlong-long"
+# endif
+extern "C" {
+#endif
+
+#define crypto_secretbox_xchacha20poly1305_KEYBYTES 32U
+SODIUM_EXPORT
+size_t crypto_secretbox_xchacha20poly1305_keybytes(void);
+
+#define crypto_secretbox_xchacha20poly1305_NONCEBYTES 24U
+SODIUM_EXPORT
+size_t crypto_secretbox_xchacha20poly1305_noncebytes(void);
+
+#define crypto_secretbox_xchacha20poly1305_MACBYTES 16U
+SODIUM_EXPORT
+size_t crypto_secretbox_xchacha20poly1305_macbytes(void);
+
+#define crypto_secretbox_xchacha20poly1305_BOXZEROBYTES 16U
+SODIUM_EXPORT
+size_t crypto_secretbox_xchacha20poly1305_boxzerobytes(void);
+
+#define crypto_secretbox_xchacha20poly1305_ZEROBYTES \
+    (crypto_secretbox_xchacha20poly1305_BOXZEROBYTES + \
+     crypto_secretbox_xchacha20poly1305_MACBYTES)
+SODIUM_EXPORT
+size_t crypto_secretbox_xchacha20poly1305_zerobytes(void);
+
+SODIUM_EXPORT
+int crypto_secretbox_xchacha20poly1305(unsigned char *c,
+                                       const unsigned char *m,
+                                       unsigned long long mlen,
+                                       const unsigned char *n,
+                                       const unsigned char *k);
+
+SODIUM_EXPORT
+int crypto_secretbox_xchacha20poly1305_open(unsigned char *m,
+                                            const unsigned char *c,
+                                            unsigned long long clen,
+                                            const unsigned char *n,
+                                            const unsigned char *k);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif