1 files changed, 66 insertions, 0 deletions
diff --git a/libs/libsodium/src/crypto_stream/xsalsa20/stream_xsalsa20.c b/libs/libsodium/src/crypto_stream/xsalsa20/stream_xsalsa20.c
new file mode 100644
index 0000000000..dc831a94d8
--- /dev/null
+++ b/libs/libsodium/src/crypto_stream/xsalsa20/stream_xsalsa20.c
@@ -0,0 +1,66 @@
+#include "crypto_core_hsalsa20.h"
+#include "crypto_stream_salsa20.h"
+#include "crypto_stream_xsalsa20.h"
+#include "randombytes.h"
+#include "utils.h"
+
+int
+crypto_stream_xsalsa20(unsigned char *c, unsigned long long clen,
+                       const unsigned char *n, const unsigned char *k)
+{
+    unsigned char subkey[32];
+    int           ret;
+
+    crypto_core_hsalsa20(subkey, n, k, NULL);
+    ret = crypto_stream_salsa20(c, clen, n + 16, subkey);
+    sodium_memzero(subkey, sizeof subkey);
+
+    return ret;
+}
+
+int
+crypto_stream_xsalsa20_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 subkey[32];
+    int           ret;
+
+    crypto_core_hsalsa20(subkey, n, k, NULL);
+    ret = crypto_stream_salsa20_xor_ic(c, m, mlen, n + 16, ic, subkey);
+    sodium_memzero(subkey, sizeof subkey);
+
+    return ret;
+}
+
+int
+crypto_stream_xsalsa20_xor(unsigned char *c, const unsigned char *m,
+                           unsigned long long mlen, const unsigned char *n,
+                           const unsigned char *k)
+{
+    return crypto_stream_xsalsa20_xor_ic(c, m, mlen, n, 0ULL, k);
+}
+
+size_t
+crypto_stream_xsalsa20_keybytes(void)
+{
+    return crypto_stream_xsalsa20_KEYBYTES;
+}
+
+size_t
+crypto_stream_xsalsa20_noncebytes(void)
+{
+    return crypto_stream_xsalsa20_NONCEBYTES;
+}
+
+size_t
+crypto_stream_xsalsa20_messagebytes_max(void)
+{
+    return crypto_stream_xsalsa20_MESSAGEBYTES_MAX;
+}
+
+void
+crypto_stream_xsalsa20_keygen(unsigned char k[crypto_stream_xsalsa20_KEYBYTES])
+{
+    randombytes_buf(k, crypto_stream_xsalsa20_KEYBYTES);
+}