From 20cb29c2f8c5c87bc590896854a20b1473ceb358 Mon Sep 17 00:00:00 2001
From: "info@mode42.com" <info@mode42.com>
Date: Sat, 8 Aug 2026 03:54:55 +0000
Subject: #2

---
 plugins/websocket/ws_sha1.c | 138 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 138 insertions(+)
 create mode 100644 plugins/websocket/ws_sha1.c

(limited to 'plugins/websocket/ws_sha1.c')

diff --git a/plugins/websocket/ws_sha1.c b/plugins/websocket/ws_sha1.c
new file mode 100644
index 0000000..53ad4c0
--- /dev/null
+++ b/plugins/websocket/ws_sha1.c
@@ -0,0 +1,138 @@
+/*
+ * Minimal SHA-1 for WebSocket handshake (RFC 6455). Public-domain style.
+ */
+#include "ws_sha1.h"
+
+#include <stdint.h>
+#include <string.h>
+#include <string.h>
+
+typedef struct ws_sha1_ctx {
+    uint32_t state[5];
+    uint64_t count;
+    uint8_t buffer[64];
+} ws_sha1_ctx_t;
+
+static uint32_t rol(uint32_t v, unsigned bits)
+{
+    return (v << bits) | (v >> (32u - bits));
+}
+
+static void ws_sha1_transform(ws_sha1_ctx_t *ctx, const uint8_t block[64])
+{
+    uint32_t w[80];
+    uint32_t a, b, c, d, e, f, k, t;
+    unsigned i;
+
+    for (i = 0; i < 16; i++) {
+        w[i] = ((uint32_t)block[i * 4] << 24) |
+               ((uint32_t)block[i * 4 + 1] << 16) |
+               ((uint32_t)block[i * 4 + 2] << 8) |
+               (uint32_t)block[i * 4 + 3];
+    }
+    for (i = 16; i < 80; i++) {
+        w[i] = rol(w[i - 3] ^ w[i - 8] ^ w[i - 14] ^ w[i - 16], 1);
+    }
+
+    a = ctx->state[0];
+    b = ctx->state[1];
+    c = ctx->state[2];
+    d = ctx->state[3];
+    e = ctx->state[4];
+
+    for (i = 0; i < 80; i++) {
+        if (i < 20) {
+            f = (b & c) | ((~b) & d);
+            k = 0x5A827999u;
+        } else if (i < 40) {
+            f = b ^ c ^ d;
+            k = 0x6ED9EBA1u;
+        } else if (i < 60) {
+            f = (b & c) | (b & d) | (c & d);
+            k = 0x8F1BBCDCu;
+        } else {
+            f = b ^ c ^ d;
+            k = 0xCA62C1D6u;
+        }
+        t = rol(a, 5) + f + e + k + w[i];
+        e = d;
+        d = c;
+        c = rol(b, 30);
+        b = a;
+        a = t;
+    }
+
+    ctx->state[0] += a;
+    ctx->state[1] += b;
+    ctx->state[2] += c;
+    ctx->state[3] += d;
+    ctx->state[4] += e;
+}
+
+static void ws_sha1_init(ws_sha1_ctx_t *ctx)
+{
+    ctx->state[0] = 0x67452301u;
+    ctx->state[1] = 0xEFCDAB89u;
+    ctx->state[2] = 0x98BADCFEu;
+    ctx->state[3] = 0x10325476u;
+    ctx->state[4] = 0xC3D2E1F0u;
+    ctx->count = 0;
+}
+
+static void ws_sha1_update(ws_sha1_ctx_t *ctx, const uint8_t *data, size_t len)
+{
+    size_t i = 0;
+    size_t idx = (size_t)((ctx->count >> 3) & 63u);
+
+    ctx->count += (uint64_t)len * 8u;
+
+    if (idx + len > 63) {
+        memcpy(ctx->buffer + idx, data, 64 - idx);
+        ws_sha1_transform(ctx, ctx->buffer);
+        for (i = 64 - idx; i + 63 < len; i += 64) {
+            ws_sha1_transform(ctx, data + i);
+        }
+        idx = 0;
+    } else {
+        i = 0;
+    }
+
+    memcpy(ctx->buffer + idx, data + i, len - i);
+}
+
+static void ws_sha1_final(ws_sha1_ctx_t *ctx, uint8_t out[20])
+{
+    uint8_t final[64];
+    size_t idx = (size_t)((ctx->count >> 3) & 63u);
+    unsigned i;
+
+    memcpy(final, ctx->buffer, idx);
+    final[idx++] = 0x80;
+    if (idx > 56) {
+        memset(final + idx, 0, 64 - idx);
+        ws_sha1_transform(ctx, final);
+        idx = 0;
+    }
+    memset(final + idx, 0, 56 - idx);
+
+    for (i = 0; i < 8; i++) {
+        final[56 + i] = (uint8_t)(ctx->count >> (56 - i * 8));
+    }
+    ws_sha1_transform(ctx, final);
+
+    for (i = 0; i < 5; i++) {
+        out[i * 4] = (uint8_t)(ctx->state[i] >> 24);
+        out[i * 4 + 1] = (uint8_t)(ctx->state[i] >> 16);
+        out[i * 4 + 2] = (uint8_t)(ctx->state[i] >> 8);
+        out[i * 4 + 3] = (uint8_t)(ctx->state[i]);
+    }
+}
+
+void hybbx_ws_sha1(const uint8_t *data, size_t len, uint8_t out[20])
+{
+    ws_sha1_ctx_t ctx;
+
+    ws_sha1_init(&ctx);
+    ws_sha1_update(&ctx, data, len);
+    ws_sha1_final(&ctx, out);
+}
-- 
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