diff --git a/OpenCL/m18900-pure.cl b/OpenCL/m18900-pure.cl
new file mode 100644
index 000000000..be43662ae
--- /dev/null
+++ b/OpenCL/m18900-pure.cl
@@ -0,0 +1,335 @@
+/**
+ * Author......: See docs/credits.txt
+ * License.....: MIT
+ */
+
+#define NEW_SIMD_CODE
+
+#include "inc_vendor.cl"
+#include "inc_hash_constants.h"
+#include "inc_hash_functions.cl"
+#include "inc_types.cl"
+#include "inc_common.cl"
+#include "inc_simd.cl"
+#include "inc_hash_sha1.cl"
+#include "inc_cipher_aes.cl"
+
+#define COMPARE_S "inc_comp_single.cl"
+#define COMPARE_M "inc_comp_multi.cl"
+
+typedef struct android_backup
+{
+  u32 version;
+  u32 cipher;
+  u32 iter;
+  u32 user_salt[16];
+  u32 ck_salt[16];
+  u32 user_iv[4];
+  u32 masterkey_blob[24];
+
+} android_backup_t;
+
+DECLSPEC void hmac_sha1_run_V (u32x *w0, u32x *w1, u32x *w2, u32x *w3, u32x *ipad, u32x *opad, 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 void m18900_init (KERN_ATTR_TMPS_ESALT (pbkdf2_sha1_tmp_t, android_backup_t))
+{
+  /**
+   * base
+   */
+
+  const u64 gid = get_global_id (0);
+
+  if (gid >= gid_max) return;
+
+  sha1_hmac_ctx_t sha1_hmac_ctx;
+
+  sha1_hmac_init_global_swap (&sha1_hmac_ctx, pws[gid].i, pws[gid].pw_len & 255);
+
+  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, salt_bufs[salt_pos].salt_buf, salt_bufs[salt_pos].salt_len);
+
+  for (u32 i = 0, j = 1; i < 8; 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 void m18900_loop (KERN_ATTR_TMPS_ESALT (pbkdf2_sha1_tmp_t, android_backup_t))
+{
+  const u64 gid = get_global_id (0);
+
+  if ((gid * VECT_SIZE) >= gid_max) 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 < 8; 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 void m18900_comp (KERN_ATTR_TMPS_ESALT (pbkdf2_sha1_tmp_t, android_backup_t))
+{
+  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 u32 s_td0[256];
+  __local u32 s_td1[256];
+  __local u32 s_td2[256];
+  __local u32 s_td3[256];
+  __local u32 s_td4[256];
+
+  __local u32 s_te0[256];
+  __local u32 s_te1[256];
+  __local u32 s_te2[256];
+  __local u32 s_te3[256];
+  __local u32 s_te4[256];
+
+  for (MAYBE_VOLATILE u32 i = lid; i < 256; i += lsz)
+  {
+    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];
+
+    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];
+  }
+
+  barrier (CLK_LOCAL_MEM_FENCE);
+
+  #else
+
+  __constant u32a *s_td0 = td0;
+  __constant u32a *s_td1 = td1;
+  __constant u32a *s_td2 = td2;
+  __constant u32a *s_td3 = td3;
+  __constant u32a *s_td4 = td4;
+
+  __constant u32a *s_te0 = te0;
+  __constant u32a *s_te1 = te1;
+  __constant u32a *s_te2 = te2;
+  __constant u32a *s_te3 = te3;
+  __constant u32a *s_te4 = te4;
+
+  #endif
+
+  if (gid >= gid_max) return;
+
+  /**
+   * aes
+   */
+
+  u32 ukey[8];
+
+  ukey[0] = tmps[gid].out[0];
+  ukey[1] = tmps[gid].out[1];
+  ukey[2] = tmps[gid].out[2];
+  ukey[3] = tmps[gid].out[3];
+  ukey[4] = tmps[gid].out[4];
+  ukey[5] = tmps[gid].out[5];
+  ukey[6] = tmps[gid].out[6];
+  ukey[7] = tmps[gid].out[7];
+
+  #define KEYLEN 60
+
+  u32 ks[KEYLEN];
+
+  AES256_set_decrypt_key (ks, ukey, s_te0, s_te1, s_te2, s_te3, s_te4, s_td0, s_td1, s_td2, s_td3, s_td4);
+
+  u32 iv[4];
+
+  iv[0] = swap32_S (esalt_bufs[digests_offset].masterkey_blob[16]);
+  iv[1] = swap32_S (esalt_bufs[digests_offset].masterkey_blob[17]);
+  iv[2] = swap32_S (esalt_bufs[digests_offset].masterkey_blob[18]);
+  iv[3] = swap32_S (esalt_bufs[digests_offset].masterkey_blob[19]);
+
+  u32 ct[4];
+
+  ct[0] = swap32_S (esalt_bufs[digests_offset].masterkey_blob[20]);
+  ct[1] = swap32_S (esalt_bufs[digests_offset].masterkey_blob[21]);
+  ct[2] = swap32_S (esalt_bufs[digests_offset].masterkey_blob[22]);
+  ct[3] = swap32_S (esalt_bufs[digests_offset].masterkey_blob[23]);
+
+  u32 pt[4];
+
+  AES256_decrypt (ks, ct, pt, s_td0, s_td1, s_td2, s_td3, s_td4);
+
+  pt[0] ^= iv[0];
+  pt[1] ^= iv[1];
+  pt[2] ^= iv[2];
+  pt[3] ^= iv[3];
+
+  if ((pt[2] == 0x0d0d0d0d) && (pt[3] == 0x0d0d0d0d))
+  {
+    if (atomic_inc (&hashes_shown[digests_offset]) == 0)
+    {
+      mark_hash (plains_buf, d_return_buf, salt_pos, digests_cnt, 0, digests_offset + 0, gid, 0);
+    }
+  }
+}
diff --git a/src/modules/module_18900.c b/src/modules/module_18900.c
new file mode 100644
index 000000000..1b32385ec
--- /dev/null
+++ b/src/modules/module_18900.c
@@ -0,0 +1,365 @@
+/**
+ * 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"
+#include "memory.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_ARCHIVE;
+static const char *HASH_NAME      = "Android Backup";
+static const u64   KERN_TYPE      = 18900;
+static const u32   OPTI_TYPE      = OPTI_TYPE_ZERO_BYTE
+                                  | 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        = "hashcat";
+static const char *ST_HASH        = "$ab$5*0*10000*b8900e4885ff9cad8f01ee1957a43bd633fea12491440514ae27aa83f2f5c006ec7e7fa0bce040add619919b4eb60608304b7d571a2ed87fd58c9ad6bc5fcf4c*7d254d93e16be9312fb1ccbfc6265c40cb0c5eab7b605a95a116e2383fb1cf12b688223f96221dcd2bf5410d4ca6f90e0789ee00157fa91658b42665d6b6844c*fc9f6be604d1c59ac32664ec2c5b9b30*00c4972149af3adcc235899e9d20611ea6e8de2212afcb9fcfefde7e35b691c2d0994eb47e4f9a260526ba47f4caea71af9c7fadcd5685d50126276f6acdd59966528b13ccc26036a0eaba2f2451aa64b05766d0edd03c988dcf87e2a9eec52d";
+
+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 pbkdf2_sha1_tmp
+{
+  u32  ipad[5];
+  u32  opad[5];
+
+  u32  dgst[8];
+  u32  out[8];
+
+} pbkdf2_sha1_tmp_t;
+
+typedef struct android_backup
+{
+  u32 version;
+  u32 cipher;
+  u32 iter;
+  u32 user_salt[16];
+  u32 ck_salt[16];
+  u32 user_iv[4];
+  u32 masterkey_blob[24];
+
+} android_backup_t;
+
+static const char *SIGNATURE_ANDROID_BACKUP = "$ab$";
+
+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 (pbkdf2_sha1_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 (android_backup_t);
+
+  return esalt_size;
+}
+
+u32 module_pw_max (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 u32 pw_max = PW_MAX;
+
+  return pw_max;
+}
+
+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;
+
+  android_backup_t *android_backup = (android_backup_t *) esalt_buf;
+
+  token_t token;
+
+  token.token_cnt  = 8;
+
+  token.signatures_cnt    = 1;
+  token.signatures_buf[0] = SIGNATURE_ANDROID_BACKUP;
+
+  // signature
+  token.len[0]     = 4;
+  token.attr[0]    = TOKEN_ATTR_FIXED_LENGTH
+                   | TOKEN_ATTR_VERIFY_SIGNATURE;
+
+  // version
+  token.len_min[1] = 1;
+  token.len_max[1] = 1;
+  token.sep[1]     = '*';
+  token.attr[1]    = TOKEN_ATTR_VERIFY_LENGTH
+                   | TOKEN_ATTR_VERIFY_DIGIT;
+
+  // cipher
+  token.len_min[2] = 1;
+  token.len_max[2] = 1;
+  token.sep[2]     = '*';
+  token.attr[2]    = TOKEN_ATTR_VERIFY_LENGTH
+                   | TOKEN_ATTR_VERIFY_DIGIT;
+
+  // iter
+  token.len_min[3] = 1;
+  token.len_max[3] = 6;
+  token.sep[3]     = '*';
+  token.attr[3]    = TOKEN_ATTR_VERIFY_LENGTH
+                   | TOKEN_ATTR_VERIFY_DIGIT;
+
+  // user_salt
+  token.len_min[4] = 128;
+  token.len_max[4] = 128;
+  token.sep[4]     = '*';
+  token.attr[4]    = TOKEN_ATTR_VERIFY_LENGTH
+                   | TOKEN_ATTR_VERIFY_HEX;
+
+  // ck_salt
+  token.len_min[5] = 128;
+  token.len_max[5] = 128;
+  token.sep[5]     = '*';
+  token.attr[5]    = TOKEN_ATTR_VERIFY_LENGTH
+                   | TOKEN_ATTR_VERIFY_HEX;
+
+  // user_iv
+  token.len_min[6] = 32;
+  token.len_max[6] = 32;
+  token.sep[6]     = '*';
+  token.attr[6]    = TOKEN_ATTR_VERIFY_LENGTH
+                   | TOKEN_ATTR_VERIFY_HEX;
+
+  // masterkey_blob
+  token.len_min[7] = 192;
+  token.len_max[7] = 192;
+  token.sep[7]     = '*';
+  token.attr[7]    = TOKEN_ATTR_VERIFY_LENGTH
+                   | TOKEN_ATTR_VERIFY_HEX;
+
+  const int rc_tokenizer = input_tokenizer ((const u8 *) line_buf, line_len, &token);
+
+  if (rc_tokenizer != PARSER_OK) return (rc_tokenizer);
+
+  const u8 *version_pos         = token.buf[1];
+  const u8 *cipher_pos          = token.buf[2];
+  const u8 *iter_pos            = token.buf[3];
+  const u8 *user_salt_pos       = token.buf[4];
+  const u8 *ck_salt_pos         = token.buf[5];
+  const u8 *user_iv_pos         = token.buf[6];
+  const u8 *masterkey_blob_pos  = token.buf[7];
+
+  // version
+
+  const int version = hc_strtoul ((const char *) version_pos, NULL, 10);
+
+  android_backup->version = version;
+
+  // cipher
+
+  const int cipher = hc_strtoul ((const char *) cipher_pos, NULL, 10);
+
+  android_backup->cipher = cipher;
+
+  // iter
+
+  const int iter = hc_strtoul ((const char *) iter_pos, NULL, 10);
+
+  android_backup->iter = iter;
+
+  // user_salt
+
+  for (int i = 0, j = 0; j < 128; i += 1, j += 8)
+  {
+    android_backup->user_salt[i] = hex_to_u32 ((const u8 *) user_salt_pos + j);
+  }
+
+  // ck_salt
+
+  for (int i = 0, j = 0; j < 128; i += 1, j += 8)
+  {
+    android_backup->ck_salt[i] = hex_to_u32 ((const u8 *) ck_salt_pos + j);
+  }
+
+  // user_iv
+
+  for (int i = 0, j = 0; j < 32; i += 1, j += 8)
+  {
+    android_backup->user_iv[i] = hex_to_u32 ((const u8 *) user_iv_pos + j);
+  }
+
+  // masterkey_blob
+
+  for (int i = 0, j = 0; j < 192; i += 1, j += 8)
+  {
+    android_backup->masterkey_blob[i] = hex_to_u32 ((const u8 *) masterkey_blob_pos + j);
+  }
+
+  // make the entry unique in our databases
+
+  salt->salt_buf[ 0] = android_backup->user_salt[ 0];
+  salt->salt_buf[ 1] = android_backup->user_salt[ 1];
+  salt->salt_buf[ 2] = android_backup->user_salt[ 2];
+  salt->salt_buf[ 3] = android_backup->user_salt[ 3];
+  salt->salt_buf[ 4] = android_backup->user_salt[ 4];
+  salt->salt_buf[ 5] = android_backup->user_salt[ 5];
+  salt->salt_buf[ 6] = android_backup->user_salt[ 6];
+  salt->salt_buf[ 7] = android_backup->user_salt[ 7];
+  salt->salt_buf[ 8] = android_backup->user_salt[ 8];
+  salt->salt_buf[ 9] = android_backup->user_salt[ 9];
+  salt->salt_buf[10] = android_backup->user_salt[10];
+  salt->salt_buf[11] = android_backup->user_salt[11];
+  salt->salt_buf[12] = android_backup->user_salt[12];
+  salt->salt_buf[13] = android_backup->user_salt[13];
+  salt->salt_buf[14] = android_backup->user_salt[14];
+  salt->salt_buf[15] = android_backup->user_salt[15];
+
+  salt->salt_len = 64;
+
+  salt->salt_iter = android_backup->iter - 1;
+
+  digest[0] = android_backup->masterkey_blob[0];
+  digest[1] = android_backup->masterkey_blob[1];
+  digest[2] = android_backup->masterkey_blob[2];
+  digest[3] = android_backup->masterkey_blob[3];
+
+  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 android_backup_t *android_backup = (const android_backup_t *) esalt_buf;
+
+  int line_len = 0;
+
+  line_len += snprintf (line_buf + line_len, line_size - line_len, "%s%u*%u*%u",
+    SIGNATURE_ANDROID_BACKUP,
+    android_backup->version,
+    android_backup->cipher,
+    android_backup->iter);
+
+  line_buf[line_len++] = '*';
+
+  for (int i = 0; i < 16; i++)
+  {
+    u32_to_hex (android_backup->user_salt[i], (u8 *) line_buf + line_len);
+
+    line_len += 8;
+  }
+
+  line_buf[line_len++] = '*';
+
+  for (int i = 0; i < 16; i++)
+  {
+    u32_to_hex (android_backup->ck_salt[i], (u8 *) line_buf + line_len);
+
+    line_len += 8;
+  }
+
+  line_buf[line_len++] = '*';
+
+  for (int i = 0; i < 4; i++)
+  {
+    u32_to_hex (android_backup->user_iv[i], (u8 *) line_buf + line_len);
+
+    line_len += 8;
+  }
+
+  line_buf[line_len++] = '*';
+
+  for (int i = 0; i < 24; i++)
+  {
+    u32_to_hex (android_backup->masterkey_blob[i], (u8 *) line_buf + line_len);
+
+    line_len += 8;
+  }
+
+  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_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_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_outfile      = 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              = 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_hlfmt_disable            = 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_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_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_pw_max;
+  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_DEFAULT;
+  module_ctx->module_warmup_disable           = MODULE_DEFAULT;
+}
diff --git a/tools/test_modules/m18900.pm b/tools/test_modules/m18900.pm
new file mode 100644
index 000000000..502c480ff
--- /dev/null
+++ b/tools/test_modules/m18900.pm
@@ -0,0 +1,96 @@
+#!/usr/bin/env perl
+
+##
+## Author......: See docs/credits.txt
+## License.....: MIT
+##
+
+use strict;
+use warnings;
+
+use Crypt::PBKDF2;
+use Crypt::CBC;
+
+sub module_constraints { [[0, 255], [-1, -1], [-1, -1], [-1, -1], [-1, -1]] }
+
+sub module_generate_hash
+{
+  my $word           = shift;
+  my $salt           = shift; # unused
+  my $version        = shift // 5;
+  my $iter           = shift // 10000;
+  my $user_salt      = shift // random_hex_string (128);
+  my $ck_salt        = shift // random_hex_string (128);
+  my $user_iv        = shift // random_hex_string (32);
+  my $masterkey_blob = shift; # use this as hint regular or verify call
+
+  my $kdf = Crypt::PBKDF2->new
+  (
+    hash_class => 'HMACSHA1',
+    iterations => $iter,
+    output_len => 32
+  );
+
+  my $user_salt_bin = pack ("H*", $user_salt);
+
+  my $key_bin = $kdf->PBKDF2 ($user_salt_bin, $word);
+
+print unpack ("H*", $key_bin), "\n";
+
+  my $iv_bin = pack ("H*", $user_iv);
+
+  my $cipher = Crypt::CBC->new ({
+    key         => $key_bin,
+    cipher      => "Crypt::Rijndael",
+    iv          => $iv_bin,
+    literal_key => 1,
+    header      => "none",
+    keysize     => 32,
+    padding     => "standard",
+  });
+
+  my $decrypted_bin = random_bytes (83);
+
+  if (defined $masterkey_blob)
+  {
+    my $encrypted_bin = pack ("H*", $masterkey_blob);
+
+    my $test_bin = $cipher->decrypt ($encrypted_bin);
+
+    if (length ($test_bin) == 83)
+    {
+      $decrypted_bin = $test_bin;
+    }
+  }
+
+  my $encrypted_bin = $cipher->encrypt ($decrypted_bin);
+
+  my $hash = sprintf ("\$ab\$%u*0*%u*%s*%s*%s*%s", $version, $iter, $user_salt, $ck_salt, $user_iv, unpack ("H*", $encrypted_bin));
+
+  return $hash;
+}
+
+sub module_verify_hash
+{
+  my $line = shift;
+
+  my ($hash, $word) = split (':', $line);
+
+  return unless defined $hash;
+  return unless defined $word;
+
+  my ($tag, $cipher, $iter, $user_salt, $ck_salt, $user_iv, $masterkey_blob) = split (/\*/, $hash);
+
+  my (undef, $signature, $version) = split (/\$/, $tag);
+
+  return unless $signature eq "ab";
+  return unless $cipher    eq "0";
+
+  my $word_packed = pack_if_HEX_notation ($word);
+
+  my $new_hash = module_generate_hash ($word_packed, undef, $version, $iter, $user_salt, $ck_salt, $user_iv, $masterkey_blob);
+
+  return ($new_hash, $word);
+}
+
+1;