diff --git a/OpenCL/m28800-pure.cl b/OpenCL/m28800-pure.cl
new file mode 100644
index 000000000..ed167af6d
--- /dev/null
+++ b/OpenCL/m28800-pure.cl
@@ -0,0 +1,399 @@
+/**
+ * Author......: See docs/credits.txt
+ * License.....: MIT
+ */
+
+#define NEW_SIMD_CODE
+
+#ifdef KERNEL_STATIC
+#include M2S(INCLUDE_PATH/inc_vendor.h)
+#include M2S(INCLUDE_PATH/inc_types.h)
+#include M2S(INCLUDE_PATH/inc_platform.cl)
+#include M2S(INCLUDE_PATH/inc_common.cl)
+#include M2S(INCLUDE_PATH/inc_simd.cl)
+#include M2S(INCLUDE_PATH/inc_hash_sha1.cl)
+#include M2S(INCLUDE_PATH/inc_cipher_aes.cl)
+#endif
+
+#define COMPARE_S M2S(INCLUDE_PATH/inc_comp_single.cl)
+#define COMPARE_M M2S(INCLUDE_PATH/inc_comp_multi.cl)
+
+typedef struct krb5db_17
+{
+  u32 user[128];
+  u32 domain[128];
+  u32 account_info[512];
+  u32 account_info_len;
+
+} krb5db_17_t;
+
+typedef struct krb5db_17_tmp
+{
+  u32 ipad[5];
+  u32 opad[5];
+  u32 dgst[10];
+  u32 out[10];
+
+} krb5db_17_tmp_t;
+
+DECLSPEC void aes128_encrypt_cbc (PRIVATE_AS const u32 *aes_ks, PRIVATE_AS u32 *aes_iv, PRIVATE_AS const u32 *in, PRIVATE_AS u32 *out, SHM_TYPE u32 *s_te0, SHM_TYPE u32 *s_te1, SHM_TYPE u32 *s_te2, SHM_TYPE u32 *s_te3, SHM_TYPE u32 *s_te4)
+{
+  u32 data[4];
+
+  data[0] = hc_swap32_S (in[0]);
+  data[1] = hc_swap32_S (in[1]);
+  data[2] = hc_swap32_S (in[2]);
+  data[3] = hc_swap32_S (in[3]);
+
+  data[0] ^= aes_iv[0];
+  data[1] ^= aes_iv[1];
+  data[2] ^= aes_iv[2];
+  data[3] ^= aes_iv[3];
+
+  aes128_encrypt (aes_ks, data, out, s_te0, s_te1, s_te2, s_te3, s_te4);
+
+  aes_iv[0] = out[0];
+  aes_iv[1] = out[1];
+  aes_iv[2] = out[2];
+  aes_iv[3] = out[3];
+
+  out[0] = hc_swap32_S (out[0]);
+  out[1] = hc_swap32_S (out[1]);
+  out[2] = hc_swap32_S (out[2]);
+  out[3] = hc_swap32_S (out[3]);
+}
+
+DECLSPEC void aes128_decrypt_cbc (PRIVATE_AS const u32 *ks1, PRIVATE_AS const u32 *in, PRIVATE_AS u32 *out, PRIVATE_AS u32 *essiv, SHM_TYPE u32 *s_td0, SHM_TYPE u32 *s_td1, SHM_TYPE u32 *s_td2, SHM_TYPE u32 *s_td3, SHM_TYPE u32 *s_td4)
+{
+  aes128_decrypt (ks1, in, out, s_td0, s_td1, s_td2, s_td3, s_td4);
+
+  out[0] ^= essiv[0];
+  out[1] ^= essiv[1];
+  out[2] ^= essiv[2];
+  out[3] ^= essiv[3];
+
+  essiv[0] = in[0];
+  essiv[1] = in[1];
+  essiv[2] = in[2];
+  essiv[3] = in[3];
+}
+
+DECLSPEC void hmac_sha1_run_V (PRIVATE_AS u32x *w0, PRIVATE_AS u32x *w1, PRIVATE_AS u32x *w2, PRIVATE_AS u32x *w3, PRIVATE_AS u32x *ipad, PRIVATE_AS u32x *opad, PRIVATE_AS u32x *digest)
+{
+  digest[0] = ipad[0];
+  digest[1] = ipad[1];
+  digest[2] = ipad[2];
+  digest[3] = ipad[3];
+  digest[4] = ipad[4];
+
+  sha1_transform_vector (w0, w1, w2, w3, digest);
+
+  w0[0] = digest[0];
+  w0[1] = digest[1];
+  w0[2] = digest[2];
+  w0[3] = digest[3];
+  w1[0] = digest[4];
+  w1[1] = 0x80000000;
+  w1[2] = 0;
+  w1[3] = 0;
+  w2[0] = 0;
+  w2[1] = 0;
+  w2[2] = 0;
+  w2[3] = 0;
+  w3[0] = 0;
+  w3[1] = 0;
+  w3[2] = 0;
+  w3[3] = (64 + 20) * 8;
+
+  digest[0] = opad[0];
+  digest[1] = opad[1];
+  digest[2] = opad[2];
+  digest[3] = opad[3];
+  digest[4] = opad[4];
+
+  sha1_transform_vector (w0, w1, w2, w3, digest);
+}
+
+KERNEL_FQ void m28800_init (KERN_ATTR_TMPS_ESALT (krb5db_17_tmp_t, krb5db_17_t))
+{
+  /**
+   * base
+   */
+
+  const u64 gid = get_global_id (0);
+
+  if (gid >= GID_CNT) return;
+
+  /**
+   * main
+   */
+
+  /* initialize hmac-sha1 for pbkdf2(password, account, 4096, account_len) */
+
+  sha1_hmac_ctx_t sha1_hmac_ctx;
+
+  sha1_hmac_init_global_swap (&sha1_hmac_ctx, pws[gid].i, pws[gid].pw_len);
+
+  tmps[gid].ipad[0] = sha1_hmac_ctx.ipad.h[0];
+  tmps[gid].ipad[1] = sha1_hmac_ctx.ipad.h[1];
+  tmps[gid].ipad[2] = sha1_hmac_ctx.ipad.h[2];
+  tmps[gid].ipad[3] = sha1_hmac_ctx.ipad.h[3];
+  tmps[gid].ipad[4] = sha1_hmac_ctx.ipad.h[4];
+
+  tmps[gid].opad[0] = sha1_hmac_ctx.opad.h[0];
+  tmps[gid].opad[1] = sha1_hmac_ctx.opad.h[1];
+  tmps[gid].opad[2] = sha1_hmac_ctx.opad.h[2];
+  tmps[gid].opad[3] = sha1_hmac_ctx.opad.h[3];
+  tmps[gid].opad[4] = sha1_hmac_ctx.opad.h[4];
+
+  sha1_hmac_update_global_swap (&sha1_hmac_ctx, esalt_bufs[DIGESTS_OFFSET_HOST].account_info, esalt_bufs[DIGESTS_OFFSET_HOST].account_info_len);
+
+ for (u32 i = 0, j = 1; i < 4; i += 5, j += 1)
+  {
+    sha1_hmac_ctx_t sha1_hmac_ctx2 = sha1_hmac_ctx;
+
+    u32 w0[4];
+    u32 w1[4];
+    u32 w2[4];
+    u32 w3[4];
+
+    w0[0] = j;
+    w0[1] = 0;
+    w0[2] = 0;
+    w0[3] = 0;
+    w1[0] = 0;
+    w1[1] = 0;
+    w1[2] = 0;
+    w1[3] = 0;
+    w2[0] = 0;
+    w2[1] = 0;
+    w2[2] = 0;
+    w2[3] = 0;
+    w3[0] = 0;
+    w3[1] = 0;
+    w3[2] = 0;
+    w3[3] = 0;
+
+    sha1_hmac_update_64 (&sha1_hmac_ctx2, w0, w1, w2, w3, 4);
+
+    sha1_hmac_final (&sha1_hmac_ctx2);
+
+    tmps[gid].dgst[i + 0] = sha1_hmac_ctx2.opad.h[0];
+    tmps[gid].dgst[i + 1] = sha1_hmac_ctx2.opad.h[1];
+    tmps[gid].dgst[i + 2] = sha1_hmac_ctx2.opad.h[2];
+    tmps[gid].dgst[i + 3] = sha1_hmac_ctx2.opad.h[3];
+    tmps[gid].dgst[i + 4] = sha1_hmac_ctx2.opad.h[4];
+
+    tmps[gid].out[i + 0] = tmps[gid].dgst[i + 0];
+    tmps[gid].out[i + 1] = tmps[gid].dgst[i + 1];
+    tmps[gid].out[i + 2] = tmps[gid].dgst[i + 2];
+    tmps[gid].out[i + 3] = tmps[gid].dgst[i + 3];
+    tmps[gid].out[i + 4] = tmps[gid].dgst[i + 4];
+  }
+}
+
+KERNEL_FQ void m28800_loop (KERN_ATTR_TMPS_ESALT (krb5db_17_tmp_t, krb5db_17_t))
+{
+   /**
+   * base
+   */
+  const u64 gid = get_global_id (0);
+
+  if ((gid * VECT_SIZE) >= GID_CNT) return;
+
+  u32x ipad[5];
+  u32x opad[5];
+
+  ipad[0] = packv (tmps, ipad, gid, 0);
+  ipad[1] = packv (tmps, ipad, gid, 1);
+  ipad[2] = packv (tmps, ipad, gid, 2);
+  ipad[3] = packv (tmps, ipad, gid, 3);
+  ipad[4] = packv (tmps, ipad, gid, 4);
+
+  opad[0] = packv (tmps, opad, gid, 0);
+  opad[1] = packv (tmps, opad, gid, 1);
+  opad[2] = packv (tmps, opad, gid, 2);
+  opad[3] = packv (tmps, opad, gid, 3);
+  opad[4] = packv (tmps, opad, gid, 4);
+
+  for (u32 i = 0; i < 4; i += 5)
+  {
+    u32x dgst[5];
+    u32x out[5];
+
+    dgst[0] = packv (tmps, dgst, gid, i + 0);
+    dgst[1] = packv (tmps, dgst, gid, i + 1);
+    dgst[2] = packv (tmps, dgst, gid, i + 2);
+    dgst[3] = packv (tmps, dgst, gid, i + 3);
+    dgst[4] = packv (tmps, dgst, gid, i + 4);
+
+    out[0] = packv (tmps, out, gid, i + 0);
+    out[1] = packv (tmps, out, gid, i + 1);
+    out[2] = packv (tmps, out, gid, i + 2);
+    out[3] = packv (tmps, out, gid, i + 3);
+    out[4] = packv (tmps, out, gid, i + 4);
+
+    for (u32 j = 0; j < LOOP_CNT; j++)
+    {
+      u32x w0[4];
+      u32x w1[4];
+      u32x w2[4];
+      u32x w3[4];
+
+      w0[0] = dgst[0];
+      w0[1] = dgst[1];
+      w0[2] = dgst[2];
+      w0[3] = dgst[3];
+      w1[0] = dgst[4];
+      w1[1] = 0x80000000;
+      w1[2] = 0;
+      w1[3] = 0;
+      w2[0] = 0;
+      w2[1] = 0;
+      w2[2] = 0;
+      w2[3] = 0;
+      w3[0] = 0;
+      w3[1] = 0;
+      w3[2] = 0;
+      w3[3] = (64 + 20) * 8;
+
+      hmac_sha1_run_V (w0, w1, w2, w3, ipad, opad, dgst);
+
+      out[0] ^= dgst[0];
+      out[1] ^= dgst[1];
+      out[2] ^= dgst[2];
+      out[3] ^= dgst[3];
+      out[4] ^= dgst[4];
+    }
+
+    unpackv (tmps, dgst, gid, i + 0, dgst[0]);
+    unpackv (tmps, dgst, gid, i + 1, dgst[1]);
+    unpackv (tmps, dgst, gid, i + 2, dgst[2]);
+    unpackv (tmps, dgst, gid, i + 3, dgst[3]);
+    unpackv (tmps, dgst, gid, i + 4, dgst[4]);
+
+    unpackv (tmps, out, gid, i + 0, out[0]);
+    unpackv (tmps, out, gid, i + 1, out[1]);
+    unpackv (tmps, out, gid, i + 2, out[2]);
+    unpackv (tmps, out, gid, i + 3, out[3]);
+    unpackv (tmps, out, gid, i + 4, out[4]);
+  }
+}
+
+KERNEL_FQ void m28800_comp (KERN_ATTR_TMPS_ESALT (krb5db_17_tmp_t, krb5db_17_t))
+{
+  /**
+   * base
+   */
+
+  const u64 gid = get_global_id (0);
+  const u64 lid = get_local_id (0);
+  const u64 lsz = get_local_size (0);
+
+  /**
+   * aes shared
+   */
+
+  #ifdef REAL_SHM
+
+  LOCAL_VK u32 s_te0[256];
+  LOCAL_VK u32 s_te1[256];
+  LOCAL_VK u32 s_te2[256];
+  LOCAL_VK u32 s_te3[256];
+  LOCAL_VK u32 s_te4[256];
+
+  LOCAL_VK u32 s_td0[256];
+  LOCAL_VK u32 s_td1[256];
+  LOCAL_VK u32 s_td2[256];
+  LOCAL_VK u32 s_td3[256];
+  LOCAL_VK u32 s_td4[256];
+
+  for (u32 i = lid; i < 256; i += lsz)
+  {
+    s_te0[i] = te0[i];
+    s_te1[i] = te1[i];
+    s_te2[i] = te2[i];
+    s_te3[i] = te3[i];
+    s_te4[i] = te4[i];
+
+    s_td0[i] = td0[i];
+    s_td1[i] = td1[i];
+    s_td2[i] = td2[i];
+    s_td3[i] = td3[i];
+    s_td4[i] = td4[i];
+  }
+
+  SYNC_THREADS ();
+
+  #else
+
+  CONSTANT_AS u32a *s_te0 = te0;
+  CONSTANT_AS u32a *s_te1 = te1;
+  CONSTANT_AS u32a *s_te2 = te2;
+  CONSTANT_AS u32a *s_te3 = te3;
+  CONSTANT_AS u32a *s_te4 = te4;
+
+  CONSTANT_AS u32a *s_td0 = td0;
+  CONSTANT_AS u32a *s_td1 = td1;
+  CONSTANT_AS u32a *s_td2 = td2;
+  CONSTANT_AS u32a *s_td3 = td3;
+  CONSTANT_AS u32a *s_td4 = td4;
+
+  #endif
+
+  if (gid >= GID_CNT) return;
+
+  /*
+    at this point, the output ('seed') will be used to generate AES keys:
+
+    key_bytes = derive(seed, 'kerberos'.encode(), seedsize)
+
+    'key_bytes' will be the AES key used to generate 'ke' and 'ki'
+    'ke' will be the AES key to decrypt the ticket
+    'ki' will be the key to compute the final HMAC
+  */
+
+  u32 nfolded[4];
+
+  // we can precompute _nfold('kerberos', 16)
+
+  nfolded[0] = 0x6b657262;
+  nfolded[1] = 0x65726f73;
+  nfolded[2] = 0x7b9b5b2b;
+  nfolded[3] = 0x93132b93;
+
+  // then aes_cbc encrypt this nfolded value with 'seed' as key along with a null IV
+
+  u32 aes_key[4];
+
+  aes_key[0] = hc_swap32_S (tmps[gid].out[0]);
+  aes_key[1] = hc_swap32_S (tmps[gid].out[1]);
+  aes_key[2] = hc_swap32_S (tmps[gid].out[2]);
+  aes_key[3] = hc_swap32_S (tmps[gid].out[3]);
+
+  u32 aes_iv[4];
+
+  aes_iv[0] = 0;
+  aes_iv[1] = 0;
+  aes_iv[2] = 0;
+  aes_iv[3] = 0;
+
+  u32 aes_ks[44];
+
+  aes128_set_encrypt_key (aes_ks, aes_key, s_te0, s_te1, s_te2, s_te3);
+
+  u32 key_bytes[4];
+
+  aes128_encrypt_cbc (aes_ks, aes_iv, nfolded, key_bytes, s_te0, s_te1, s_te2, s_te3, s_te4);
+
+  const u32 r0 = key_bytes[0];
+  const u32 r1 = key_bytes[1];
+  const u32 r2 = key_bytes[2];
+  const u32 r3 = key_bytes[3];
+
+  #define il_pos 0
+
+  #ifdef KERNEL_STATIC
+  #include COMPARE_M
+  #endif
+}
diff --git a/src/modules/module_28800.c b/src/modules/module_28800.c
new file mode 100644
index 000000000..fa8586131
--- /dev/null
+++ b/src/modules/module_28800.c
@@ -0,0 +1,333 @@
+/**
+ * Author......: See docs/credits.txt
+ * License.....: MIT
+ */
+
+#include "common.h"
+#include "types.h"
+#include "modules.h"
+#include "bitops.h"
+#include "convert.h"
+#include "shared.h"
+
+static const u32   ATTACK_EXEC    = ATTACK_EXEC_OUTSIDE_KERNEL;
+static const u32   DGST_POS0      = 0;
+static const u32   DGST_POS1      = 1;
+static const u32   DGST_POS2      = 2;
+static const u32   DGST_POS3      = 3;
+static const u32   DGST_SIZE      = DGST_SIZE_4_4;
+static const u32   HASH_CATEGORY  = HASH_CATEGORY_NETWORK_PROTOCOL;
+static const char *HASH_NAME      = "Kerberos 5, etype 17, DB";
+static const u64   KERN_TYPE      = 28800;
+static const u32   OPTI_TYPE      = OPTI_TYPE_ZERO_BYTE
+                                  | OPTI_TYPE_NOT_ITERATED
+                                  | OPTI_TYPE_SLOW_HASH_SIMD_LOOP;
+static const u64   OPTS_TYPE      = OPTS_TYPE_PT_GENERATE_LE;
+static const u32   SALT_TYPE      = SALT_TYPE_EMBEDDED;
+static const char *ST_PASS        = "password";
+static const char *ST_HASH        = "$krb5db$17$test$TEST.LOCAL$6fb8b78e20ad3df6591cabb9cacf4594";
+
+u32         module_attack_exec    (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return ATTACK_EXEC;     }
+u32         module_dgst_pos0      (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return DGST_POS0;       }
+u32         module_dgst_pos1      (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return DGST_POS1;       }
+u32         module_dgst_pos2      (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return DGST_POS2;       }
+u32         module_dgst_pos3      (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return DGST_POS3;       }
+u32         module_dgst_size      (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return DGST_SIZE;       }
+u32         module_hash_category  (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return HASH_CATEGORY;   }
+const char *module_hash_name      (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return HASH_NAME;       }
+u64         module_kern_type      (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return KERN_TYPE;       }
+u32         module_opti_type      (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return OPTI_TYPE;       }
+u64         module_opts_type      (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return OPTS_TYPE;       }
+u32         module_salt_type      (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return SALT_TYPE;       }
+const char *module_st_hash        (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return ST_HASH;         }
+const char *module_st_pass        (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra) { return ST_PASS;         }
+
+typedef struct krb5db_17
+{
+  u32 user[128];
+  u32 domain[128];
+  u32 account_info[512];
+  u32 account_info_len;
+
+} krb5db_17_t;
+
+typedef struct krb5db_17_tmp
+{
+  u32 ipad[5];
+  u32 opad[5];
+  u32 dgst[10];
+  u32 out[10];
+
+} krb5db_17_tmp_t;
+
+static const char *SIGNATURE_KRB5DB = "$krb5db$17$";
+
+bool module_unstable_warning (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra, MAYBE_UNUSED const hc_device_param_t *device_param)
+{
+  // AMD Radeon Pro W5700X Compute Engine; 1.2 (Apr 22 2021 21:54:44); 11.3.1; 20E241
+  if ((device_param->opencl_platform_vendor_id == VENDOR_ID_APPLE) && (device_param->opencl_device_type & CL_DEVICE_TYPE_GPU))
+  {
+    if (device_param->is_metal == false)
+    {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+u64 module_tmp_size (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra)
+{
+  const u64 tmp_size = (const u64) sizeof (krb5db_17_tmp_t);
+
+  return tmp_size;
+}
+
+u64 module_esalt_size (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra)
+{
+  const u64 esalt_size = (const u64) sizeof (krb5db_17_t);
+
+  return esalt_size;
+}
+
+int module_hash_decode (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED void *digest_buf, MAYBE_UNUSED salt_t *salt, MAYBE_UNUSED void *esalt_buf, MAYBE_UNUSED void *hook_salt_buf, MAYBE_UNUSED hashinfo_t *hash_info, const char *line_buf, MAYBE_UNUSED const int line_len)
+{
+  u32 *digest = (u32 *) digest_buf;
+
+  krb5db_17_t *krb5db = (krb5db_17_t *) esalt_buf;
+
+  hc_token_t token;
+
+  token.signatures_cnt    = 1;
+  token.signatures_buf[0] = SIGNATURE_KRB5DB;
+
+  token.len[0]  = 11;
+  token.attr[0] = TOKEN_ATTR_FIXED_LENGTH
+                | TOKEN_ATTR_VERIFY_SIGNATURE;
+
+  /**
+   * $krb5db$17$user$realm$hash
+   * $krb5db$17$user$realm$*spn*$hash
+   */
+
+  // assume no signature found
+  if (line_len < 11) return (PARSER_SALT_LENGTH);
+
+  char *spn_info_start  = strchr ((const char *) line_buf + 11 + 1, '*');
+
+  int is_spn_provided = 0;
+
+  // assume $krb5db$17$user$realm$hash
+  if (spn_info_start == NULL)
+  {
+    token.token_cnt  = 4;
+
+    token.sep[1]     = '$';
+    token.len_min[1] = 1;
+    token.len_max[1] = 512;
+    token.attr[1]    = TOKEN_ATTR_VERIFY_LENGTH;
+
+    token.sep[2]     = '$';
+    token.len_min[2] = 1;
+    token.len_max[2] = 512;
+    token.attr[2]    = TOKEN_ATTR_VERIFY_LENGTH;
+
+    token.sep[3]     = '$';
+    token.len_min[3] = 32;
+    token.len_max[3] = 32;
+    token.attr[3]    = TOKEN_ATTR_VERIFY_LENGTH
+                       | TOKEN_ATTR_VERIFY_HEX;
+  }
+  // assume $krb5db$17$user$realm$*spn*$hash
+  else
+  {
+    char *spn_info_stop = strchr ((const char *) spn_info_start + 1, '*');
+
+    if (spn_info_stop == NULL) return (PARSER_SEPARATOR_UNMATCHED);
+
+    spn_info_stop++; // we want the * $char included
+    spn_info_stop++; // we want the $ char included
+
+    const int spn_info_len = spn_info_stop - spn_info_start;
+
+    token.token_cnt  = 5;
+
+    token.sep[1]     = '$';
+    token.len_min[1] = 1;
+    token.len_max[1] = 512;
+    token.attr[1]    = TOKEN_ATTR_VERIFY_LENGTH;
+
+    token.sep[2]     = '$';
+    token.len_min[2] = 1;
+    token.len_max[2] = 512;
+    token.attr[2]    = TOKEN_ATTR_VERIFY_LENGTH;
+
+    token.len[3]     = spn_info_len;
+    token.attr[3]    = TOKEN_ATTR_FIXED_LENGTH;
+
+    token.sep[4]     = '$';
+    token.len_min[4] = 32;
+    token.len_max[4] = 32;
+    token.attr[4]    = TOKEN_ATTR_VERIFY_LENGTH
+                       | TOKEN_ATTR_VERIFY_HEX;
+
+    is_spn_provided = 1;
+  }
+
+  const int rc_tokenizer = input_tokenizer ((const u8 *) line_buf, line_len, &token);
+
+  if (rc_tokenizer != PARSER_OK) return (rc_tokenizer);
+
+  const u8 *user_pos;
+  const u8 *domain_pos;
+  const u8 *checksum_pos;
+
+  int user_len;
+  int domain_len;
+  int account_info_len;
+
+  user_pos = token.buf[1];
+  user_len = token.len[1];
+
+  memcpy (krb5db->user, user_pos, user_len);
+
+  domain_pos = token.buf[2];
+  domain_len = token.len[2];
+
+  memcpy (krb5db->domain, domain_pos, domain_len);
+
+  checksum_pos = token.buf[3 + is_spn_provided];
+
+  account_info_len = token.len[2] + token.len[1];
+
+  u8 *account_info_ptr = (u8 *) krb5db->account_info;
+
+  // domain must be uppercase
+
+  u8 domain[128];
+
+  memcpy (domain, domain_pos, domain_len);
+  uppercase (domain, domain_len);
+
+  memcpy (account_info_ptr, domain, domain_len);
+  memcpy (account_info_ptr + domain_len, user_pos, user_len);
+
+  krb5db->account_info_len = account_info_len;
+
+  // salt
+
+  salt->salt_buf[0] = krb5db->account_info[0];
+  salt->salt_buf[1] = krb5db->account_info[1];
+  salt->salt_buf[2] = krb5db->account_info[2];
+  salt->salt_buf[3] = krb5db->account_info[3];
+
+  salt->salt_len = 16;
+
+  salt->salt_iter = 4096 - 1;
+
+  // digest
+
+  digest[0] = byte_swap_32 (hex_to_u32 (checksum_pos +  0));
+  digest[1] = byte_swap_32 (hex_to_u32 (checksum_pos +  8));
+  digest[2] = byte_swap_32 (hex_to_u32 (checksum_pos + 16));
+  digest[3] = byte_swap_32 (hex_to_u32 (checksum_pos + 24));
+
+  return (PARSER_OK);
+}
+
+int module_hash_encode (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const void *digest_buf, MAYBE_UNUSED const salt_t *salt, MAYBE_UNUSED const void *esalt_buf, MAYBE_UNUSED const void *hook_salt_buf, MAYBE_UNUSED const hashinfo_t *hash_info, char *line_buf, MAYBE_UNUSED const int line_size)
+{
+  const u32 *digest = (const u32 *) digest_buf;
+
+  const krb5db_17_t *krb5db = (const krb5db_17_t *) esalt_buf;
+
+  const int line_len = snprintf (line_buf, line_size, "%s%s$%s$%08x%08x%08x%08x",
+    SIGNATURE_KRB5DB,
+    (char *) krb5db->user,
+    (char *) krb5db->domain,
+    digest[0],
+    digest[1],
+    digest[2],
+    digest[3]);
+
+  return line_len;
+}
+
+void module_init (module_ctx_t *module_ctx)
+{
+  module_ctx->module_context_size             = MODULE_CONTEXT_SIZE_CURRENT;
+  module_ctx->module_interface_version        = MODULE_INTERFACE_VERSION_CURRENT;
+
+  module_ctx->module_attack_exec              = module_attack_exec;
+  module_ctx->module_benchmark_esalt          = MODULE_DEFAULT;
+  module_ctx->module_benchmark_hook_salt      = MODULE_DEFAULT;
+  module_ctx->module_benchmark_mask           = MODULE_DEFAULT;
+  module_ctx->module_benchmark_salt           = MODULE_DEFAULT;
+  module_ctx->module_build_plain_postprocess  = MODULE_DEFAULT;
+  module_ctx->module_deep_comp_kernel         = MODULE_DEFAULT;
+  module_ctx->module_deprecated_notice        = MODULE_DEFAULT;
+  module_ctx->module_dgst_pos0                = module_dgst_pos0;
+  module_ctx->module_dgst_pos1                = module_dgst_pos1;
+  module_ctx->module_dgst_pos2                = module_dgst_pos2;
+  module_ctx->module_dgst_pos3                = module_dgst_pos3;
+  module_ctx->module_dgst_size                = module_dgst_size;
+  module_ctx->module_dictstat_disable         = MODULE_DEFAULT;
+  module_ctx->module_esalt_size               = module_esalt_size;
+  module_ctx->module_extra_buffer_size        = MODULE_DEFAULT;
+  module_ctx->module_extra_tmp_size           = MODULE_DEFAULT;
+  module_ctx->module_extra_tuningdb_block     = MODULE_DEFAULT;
+  module_ctx->module_forced_outfile_format    = MODULE_DEFAULT;
+  module_ctx->module_hash_binary_count        = MODULE_DEFAULT;
+  module_ctx->module_hash_binary_parse        = MODULE_DEFAULT;
+  module_ctx->module_hash_binary_save         = MODULE_DEFAULT;
+  module_ctx->module_hash_decode_postprocess  = MODULE_DEFAULT;
+  module_ctx->module_hash_decode_potfile      = MODULE_DEFAULT;
+  module_ctx->module_hash_decode_zero_hash    = MODULE_DEFAULT;
+  module_ctx->module_hash_decode              = module_hash_decode;
+  module_ctx->module_hash_encode_status       = MODULE_DEFAULT;
+  module_ctx->module_hash_encode_potfile      = MODULE_DEFAULT;
+  module_ctx->module_hash_encode              = module_hash_encode;
+  module_ctx->module_hash_init_selftest       = MODULE_DEFAULT;
+  module_ctx->module_hash_mode                = MODULE_DEFAULT;
+  module_ctx->module_hash_category            = module_hash_category;
+  module_ctx->module_hash_name                = module_hash_name;
+  module_ctx->module_hashes_count_min         = MODULE_DEFAULT;
+  module_ctx->module_hashes_count_max         = MODULE_DEFAULT;
+  module_ctx->module_hlfmt_disable            = MODULE_DEFAULT;
+  module_ctx->module_hook_extra_param_size    = MODULE_DEFAULT;
+  module_ctx->module_hook_extra_param_init    = MODULE_DEFAULT;
+  module_ctx->module_hook_extra_param_term    = MODULE_DEFAULT;
+  module_ctx->module_hook12                   = MODULE_DEFAULT;
+  module_ctx->module_hook23                   = MODULE_DEFAULT;
+  module_ctx->module_hook_salt_size           = MODULE_DEFAULT;
+  module_ctx->module_hook_size                = MODULE_DEFAULT;
+  module_ctx->module_jit_build_options        = MODULE_DEFAULT;
+  module_ctx->module_jit_cache_disable        = MODULE_DEFAULT;
+  module_ctx->module_kernel_accel_max         = MODULE_DEFAULT;
+  module_ctx->module_kernel_accel_min         = MODULE_DEFAULT;
+  module_ctx->module_kernel_loops_max         = MODULE_DEFAULT;
+  module_ctx->module_kernel_loops_min         = MODULE_DEFAULT;
+  module_ctx->module_kernel_threads_max       = MODULE_DEFAULT;
+  module_ctx->module_kernel_threads_min       = MODULE_DEFAULT;
+  module_ctx->module_kern_type                = module_kern_type;
+  module_ctx->module_kern_type_dynamic        = MODULE_DEFAULT;
+  module_ctx->module_opti_type                = module_opti_type;
+  module_ctx->module_opts_type                = module_opts_type;
+  module_ctx->module_outfile_check_disable    = MODULE_DEFAULT;
+  module_ctx->module_outfile_check_nocomp     = MODULE_DEFAULT;
+  module_ctx->module_potfile_custom_check     = MODULE_DEFAULT;
+  module_ctx->module_potfile_disable          = MODULE_DEFAULT;
+  module_ctx->module_potfile_keep_all_hashes  = MODULE_DEFAULT;
+  module_ctx->module_pwdump_column            = MODULE_DEFAULT;
+  module_ctx->module_pw_max                   = MODULE_DEFAULT;
+  module_ctx->module_pw_min                   = MODULE_DEFAULT;
+  module_ctx->module_salt_max                 = MODULE_DEFAULT;
+  module_ctx->module_salt_min                 = MODULE_DEFAULT;
+  module_ctx->module_salt_type                = module_salt_type;
+  module_ctx->module_separator                = MODULE_DEFAULT;
+  module_ctx->module_st_hash                  = module_st_hash;
+  module_ctx->module_st_pass                  = module_st_pass;
+  module_ctx->module_tmp_size                 = module_tmp_size;
+  module_ctx->module_unstable_warning         = module_unstable_warning;
+  module_ctx->module_warmup_disable           = MODULE_DEFAULT;
+}
diff --git a/tools/test_modules/m28800.pm b/tools/test_modules/m28800.pm
new file mode 100644
index 000000000..ca67cb243
--- /dev/null
+++ b/tools/test_modules/m28800.pm
@@ -0,0 +1,103 @@
+#!/usr/bin/env perl
+
+##
+## Author......: See docs/credits.txt
+## License.....: MIT
+##
+
+use strict;
+use warnings;
+
+use Digest::SHA qw (hmac_sha1);
+use Crypt::Mode::CBC;
+use Crypt::PBKDF2;
+
+sub byte2hex
+{
+  my $input = shift;
+  return unpack ("H*", $input);
+}
+
+sub hex2byte
+{
+  my $input = shift;
+  return pack ("H*", $input);
+}
+
+sub pad
+{
+  my $n = shift;
+  my $size = shift;
+
+  return (~$n + 1) & ($size - 1);
+}
+
+sub module_constraints { [[0, 256], [16, 16], [-1, -1], [-1, -1], [-1, -1]] }
+
+sub module_generate_hash
+{
+  my $word      = shift;
+  my $salt      = shift;
+  my $user      = shift // "user";
+  my $realm     = shift // "realm";
+
+  my $mysalt = uc $realm;
+  $mysalt = $mysalt . $user;
+
+  # first we generate the 'seed'
+  my $iter = 4096;
+  my $pbkdf2 = Crypt::PBKDF2->new
+  (
+    hash_class => 'HMACSHA1',
+    iterations => $iter,
+    output_len => 16
+  );
+
+  my $b_seed = $pbkdf2->PBKDF2 ($mysalt, $word);
+
+  # we can precompute this
+  my $b_kerberos_nfolded = hex2byte ('6b65726265726f737b9b5b2b93132b93');
+
+  my $b_iv = hex2byte ('0' x 32);
+
+  # 'key_bytes' will be the AES key used to generate 'ki' (for final hmac-sha1)
+  # and 'ke' (AES key to decrypt/encrypt the ticket)
+  my $cbc         = Crypt::Mode::CBC->new ('AES', 0);
+  my $b_key_bytes = $cbc->encrypt ($b_kerberos_nfolded, $b_seed, $b_iv);
+
+  my $tmp_hash = sprintf ('$krb5db$17$%s$%s$%s', $user, $realm, unpack ("H*", $b_key_bytes));
+
+  return $tmp_hash;
+}
+
+sub module_verify_hash
+{
+  my $line = shift;
+
+  my ($hash, $word) = split (':', $line);
+
+  return unless defined $hash;
+  return unless defined $word;
+
+  my @data = split ('\$', $hash);
+
+  return unless scalar @data == 5;
+
+  shift @data;
+
+  my $signature = shift @data;
+  my $algorithm = shift @data;
+  my $user      = shift @data;
+  my $realm     = shift @data;
+
+  return unless ($signature eq "krb5db");
+  return unless ($algorithm eq "17");
+
+  my $word_packed = pack_if_HEX_notation ($word);
+
+  my $new_hash = module_generate_hash ($word_packed, undef, $user, $realm);
+
+  return ($new_hash, $word);
+}
+
+1;