diff --git a/OpenCL/m21420_a0-pure.cl b/OpenCL/m21420_a0-pure.cl
index 24070528a..4da324233 100644
--- a/OpenCL/m21420_a0-pure.cl
+++ b/OpenCL/m21420_a0-pure.cl
@@ -22,8 +22,9 @@ KERNEL_FQ void m21420_mxx (KERN_ATTR_RULES ())
    * modifier
    */
 
-  const u64 lid = get_local_id (0);
   const u64 gid = get_global_id (0);
+  const u64 lid = get_local_id (0);
+  const u64 lsz = get_local_size (0);
 
   if (gid >= gid_max) return;
 
@@ -31,48 +32,63 @@ KERNEL_FQ void m21420_mxx (KERN_ATTR_RULES ())
    * base
    */
 
+  u32 w0[4];
+  u32 w1[4];
+  u32 w2[4];
+  u32 w3[4];
+
   COPY_PW (pws[gid]);
 
-  sha256_ctx_t ctx0;
+  const u32 salt_len = salt_bufs[SALT_POS].salt_len;
 
-  sha256_init (&ctx0);
+  u32 s[64] = { 0 };
 
-  sha256_update_global_swap (&ctx0, salt_bufs[salt_pos].salt_buf, salt_bufs[salt_pos].salt_len);
+  for (int i = 0, idx = 0; i < salt_len; i += 4, idx += 1)
+  {
+    s[idx] = hc_swap32_S (salt_bufs[SALT_POS].salt_buf[idx]);
+  }
 
   /**
    * loop
    */
 
-  u32 w0[4];
-  u32 w1[4];
-  u32 w2[4];
-  u32 w3[4];
-
   for (u32 il_pos = 0; il_pos < il_cnt; il_pos++)
   {
     pw_t tmp = PASTE_PW;
 
     tmp.pw_len = apply_rules (rules_buf[il_pos].cmds, tmp.i, tmp.pw_len);
 
-    sha256_ctx_t ctx1;
+    sha256_ctx_t ctx0;
+
+    sha256_init (&ctx0);
+
+    sha256_update_swap (&ctx0, tmp.i, tmp.pw_len);
 
-    sha256_init (&ctx1);
+    sha256_final (&ctx0);
 
-    sha256_update_swap (&ctx1, tmp.i, tmp.pw_len);
+    const u32 a = ctx0.h[0];
+    const u32 b = ctx0.h[1];
+    const u32 c = ctx0.h[2];
+    const u32 d = ctx0.h[3];
+    const u32 e = ctx0.h[4];
+    const u32 f = ctx0.h[5];
+    const u32 g = ctx0.h[6];
+    const u32 h = ctx0.h[7];
 
-    sha256_final (&ctx1);
+    sha256_ctx_t ctx;
 
-    sha256_ctx_t ctx = ctx0;
+    sha256_init (&ctx);
 
-    w0[0] = ctx1.h[0];
-    w0[1] = ctx1.h[1];
-    w0[2] = ctx1.h[2];
-    w0[3] = ctx1.h[3];
-    w1[0] = ctx1.h[4];
-    w1[1] = ctx1.h[5];
-    w1[2] = ctx1.h[6];
-    w1[3] = ctx1.h[7];
+    sha256_update (&ctx, s, salt_len);
 
+    w0[0] = a;
+    w0[1] = b;
+    w0[2] = c;
+    w0[3] = d;
+    w1[0] = e;
+    w1[1] = f;
+    w1[2] = g;
+    w1[3] = h;
     w2[0] = 0;
     w2[1] = 0;
     w2[2] = 0;
@@ -101,8 +117,9 @@ KERNEL_FQ void m21420_sxx (KERN_ATTR_RULES ())
    * modifier
    */
 
-  const u64 lid = get_local_id (0);
   const u64 gid = get_global_id (0);
+  const u64 lid = get_local_id (0);
+  const u64 lsz = get_local_size (0);
 
   if (gid >= gid_max) return;
 
@@ -112,58 +129,73 @@ KERNEL_FQ void m21420_sxx (KERN_ATTR_RULES ())
 
   const u32 search[4] =
   {
-    digests_buf[digests_offset].digest_buf[DGST_R0],
-    digests_buf[digests_offset].digest_buf[DGST_R1],
-    digests_buf[digests_offset].digest_buf[DGST_R2],
-    digests_buf[digests_offset].digest_buf[DGST_R3]
+    digests_buf[DIGESTS_OFFSET].digest_buf[DGST_R0],
+    digests_buf[DIGESTS_OFFSET].digest_buf[DGST_R1],
+    digests_buf[DIGESTS_OFFSET].digest_buf[DGST_R2],
+    digests_buf[DIGESTS_OFFSET].digest_buf[DGST_R3]
   };
 
   /**
    * base
    */
 
+  u32 w0[4];
+  u32 w1[4];
+  u32 w2[4];
+  u32 w3[4];
+
   COPY_PW (pws[gid]);
 
-  sha256_ctx_t ctx0;
+  const u32 salt_len = salt_bufs[SALT_POS].salt_len;
 
-  sha256_init (&ctx0);
+  u32 s[64] = { 0 };
 
-  sha256_update_global_swap (&ctx0, salt_bufs[salt_pos].salt_buf, salt_bufs[salt_pos].salt_len);
+  for (int i = 0, idx = 0; i < salt_len; i += 4, idx += 1)
+  {
+    s[idx] = hc_swap32_S (salt_bufs[SALT_POS].salt_buf[idx]);
+  }
 
   /**
    * loop
    */
 
-  u32 w0[4];
-  u32 w1[4];
-  u32 w2[4];
-  u32 w3[4];
-
   for (u32 il_pos = 0; il_pos < il_cnt; il_pos++)
   {
     pw_t tmp = PASTE_PW;
 
     tmp.pw_len = apply_rules (rules_buf[il_pos].cmds, tmp.i, tmp.pw_len);
 
-    sha256_ctx_t ctx1;
+    sha256_ctx_t ctx0;
+
+    sha256_init (&ctx0);
+
+    sha256_update_swap (&ctx0, tmp.i, tmp.pw_len);
 
-    sha256_init (&ctx1);
+    sha256_final (&ctx0);
 
-    sha256_update_swap (&ctx1, tmp.i, tmp.pw_len);
+    const u32 a = ctx0.h[0];
+    const u32 b = ctx0.h[1];
+    const u32 c = ctx0.h[2];
+    const u32 d = ctx0.h[3];
+    const u32 e = ctx0.h[4];
+    const u32 f = ctx0.h[5];
+    const u32 g = ctx0.h[6];
+    const u32 h = ctx0.h[7];
 
-    sha256_final (&ctx1);
+    sha256_ctx_t ctx;
 
-    sha256_ctx_t ctx = ctx0;
+    sha256_init (&ctx);
 
-    w0[0] = ctx1.h[0];
-    w0[1] = ctx1.h[1];
-    w0[2] = ctx1.h[2];
-    w0[3] = ctx1.h[3];
-    w1[0] = ctx1.h[4];
-    w1[1] = ctx1.h[5];
-    w1[2] = ctx1.h[6];
-    w1[3] = ctx1.h[7];
+    sha256_update (&ctx, s, salt_len);
 
+    w0[0] = a;
+    w0[1] = b;
+    w0[2] = c;
+    w0[3] = d;
+    w1[0] = e;
+    w1[1] = f;
+    w1[2] = g;
+    w1[3] = h;
     w2[0] = 0;
     w2[1] = 0;
     w2[2] = 0;