1 files changed, 69 insertions, 0 deletions
diff --git a/libs/libsodium/src/crypto_stream/xchacha20/stream_xchacha20.c b/libs/libsodium/src/crypto_stream/xchacha20/stream_xchacha20.c
new file mode 100644
index 0000000000..8b1bc09abd
--- /dev/null
+++ b/libs/libsodium/src/crypto_stream/xchacha20/stream_xchacha20.c
@@ -0,0 +1,69 @@
+
+#include <stdlib.h>
+
+#include "crypto_core_hchacha20.h"
+#include "crypto_stream_chacha20.h"
+#include "crypto_stream_xchacha20.h"
+#include "private/common.h"
+#include "randombytes.h"
+
+size_t
+crypto_stream_xchacha20_keybytes(void)
+{
+    return crypto_stream_xchacha20_KEYBYTES;
+}
+
+size_t
+crypto_stream_xchacha20_noncebytes(void)
+{
+    return crypto_stream_xchacha20_NONCEBYTES;
+}
+
+size_t
+crypto_stream_xchacha20_messagebytes_max(void)
+{
+    return crypto_stream_xchacha20_MESSAGEBYTES_MAX;
+}
+
+int
+crypto_stream_xchacha20(unsigned char *c, unsigned long long clen,
+                        const unsigned char *n, const unsigned char *k)
+{
+    unsigned char k2[crypto_core_hchacha20_OUTPUTBYTES];
+
+    crypto_core_hchacha20(k2, n, k, NULL);
+    COMPILER_ASSERT(crypto_stream_chacha20_KEYBYTES <= sizeof k2);
+    COMPILER_ASSERT(crypto_stream_chacha20_NONCEBYTES ==
+                    crypto_stream_xchacha20_NONCEBYTES -
+                        crypto_core_hchacha20_INPUTBYTES);
+
+    return crypto_stream_chacha20(c, clen, n + crypto_core_hchacha20_INPUTBYTES,
+                                  k2);
+}
+
+int
+crypto_stream_xchacha20_xor_ic(unsigned char *c, const unsigned char *m,
+                               unsigned long long mlen, const unsigned char *n,
+                               uint64_t ic, const unsigned char *k)
+{
+    unsigned char k2[crypto_core_hchacha20_OUTPUTBYTES];
+
+    crypto_core_hchacha20(k2, n, k, NULL);
+    return crypto_stream_chacha20_xor_ic(
+        c, m, mlen, n + crypto_core_hchacha20_INPUTBYTES, ic, k2);
+}
+
+int
+crypto_stream_xchacha20_xor(unsigned char *c, const unsigned char *m,
+                            unsigned long long mlen, const unsigned char *n,
+                            const unsigned char *k)
+{
+    return crypto_stream_xchacha20_xor_ic(c, m, mlen, n, 0U, k);
+}
+
+void
+crypto_stream_xchacha20_keygen(
+    unsigned char k[crypto_stream_xchacha20_KEYBYTES])
+{
+    randombytes_buf(k, crypto_stream_xchacha20_KEYBYTES);
+}