Introducing websocket support in router and libunit.

src/nxt_websocket_accept.c

@@ -0,0 +1,68 @@
+
+/*
+ * Copyright (C) NGINX, Inc.
+ */
+
+#include <nxt_main.h>
+#include <nxt_websocket.h>
+#include <nxt_sha1.h>
+
+
+static void
+nxt_websocket_base64_encode(u_char *d, const uint8_t *s, size_t len)
+{
+    u_char         c0, c1, c2;
+    static u_char  basis[] =
+        "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+    while (len > 2) {
+        c0 = s[0];
+        c1 = s[1];
+        c2 = s[2];
+
+        *d++ = basis[c0 >> 2];
+        *d++ = basis[((c0 & 0x03) << 4) | (c1 >> 4)];
+        *d++ = basis[((c1 & 0x0f) << 2) | (c2 >> 6)];
+        *d++ = basis[c2 & 0x3f];
+
+        s += 3;
+        len -= 3;
+    }
+
+    if (len > 0) {
+        c0 = s[0];
+        *d++ = basis[c0 >> 2];
+
+        if (len == 1) {
+            *d++ = basis[(c0 & 0x03) << 4];
+            *d++ = '=';
+            *d++ = '=';
+
+        } else {
+            c1 = s[1];
+
+            *d++ = basis[((c0 & 0x03) << 4) | (c1 >> 4)];
+            *d++ = basis[(c1 & 0x0f) << 2];
+
+            *d++ = '=';
+        }
+    }
+}
+
+
+void
+nxt_websocket_accept(u_char *accept, const void *key)
+{
+    u_char             bin_accept[20];
+    nxt_sha1_t         ctx;
+    static const char  accept_guid[] = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
+
+    nxt_sha1_init(&ctx);
+    nxt_sha1_update(&ctx, key, 24);
+    nxt_sha1_update(&ctx, accept_guid, nxt_length(accept_guid));
+    nxt_sha1_final(bin_accept, &ctx);
+
+    nxt_websocket_base64_encode(accept, bin_accept, sizeof(bin_accept));
+}
+
+