# Encipher and Decipher nKode

## Customer Policy
- max nkode length: {{ max_nkode_len }}
- number of keys: {{ numb_of_keys }}
- properties per key: {{ props_per_key }}
- total number of properties: {{ numb_of_keys * props_per_key }}

## Customer Cipher
- property key: {{ customer_property_key }}
- position key: {{ customer_position_key }}


---

## User Cipher
- property key: {{ user_property_key }}
- passcode key: {{ pass_key }}
- combined position key: {{ combined_position_key }}
- mask key: {{ mask_key }}

### Combined Postion Key
```mermaid
block-beta
  columns 2
  user_pos["user position key:\n{{user_position_key}}"]
  customer_pos["customer position key:\n{{customer_position_key}}"]
  space:2
  xor(("XOR")):2
  user_pos --> xor
  customer_pos --> xor
  space:2
  comb_pos["combined position key\n{{combined_position_key}}"]:2
  xor --> comb_pos
```

## User Keypad
- keypad: {{ user_keypad}} 
- user passcode indices: {{ user_passcode_idxs}}

## nKode Cipher

### Passcode Hash 
```mermaid
block-beta
    columns 2
    cprop["customer_property_key\n{{customer_property_key}}"]
    uprop["user_property_key\n{{user_property_key}}"]
    space:2
    xor1(("XOR")):2
    cprop --> xor1
    uprop --> xor1
    space:2
    prop["combined_property_key\n{{combined_property_key}}"]
    xor1 --> prop
    pass["user_passcode_indices\n{{user_passcode_idxs}}"]
    space:2
    sel(("select\nproperties")):2
    pass --> sel
    prop --> sel
    space:2
    passcode["user passcode properties:\n{{user_passcode_props}}"]:2
    sel --> passcode
    space:2
    pad["zero pad to\nmax nkode length: {{max_nkode_len}}"]:2
    passcode -->pad
    space:2
    paddedpasscode["padded passcode:\n{{padded_passcode}}"]
    pad --> paddedpasscode
    passkey["passcode key:\n{{pass_key}}"]
    space:2
    xor2(("XOR")):2
    passkey --> xor2
    paddedpasscode --> xor2
    space:2
    cipheredpass["ciphered passcode:\n{{ciphered_passcode}}"]:2
    xor2 --> cipheredpass
    space:2
    hash(("hash")):2
    cipheredpass --> hash
    space:2
    cipheredhashed["hashed ciphered passcode:\n{{code}}"]:2
    hash --> cipheredhashed
```

### Mask Encipher
```mermaid
block-beta
    columns 3
    passcode_idx["passcode indices:\n{{user_passcode_idxs}}"]
    comb_pos["combined position key:\n{{combined_position_key}}"]
    cust_pos["customer position key:\n{{customer_position_key}}"]
    
    space:3
    propidx(["Get Position Idx:\nmap each to element mod props_per_key"])
    passcode_idx-->propidx
    space:1
    xor1(("XOR"))
    comb_pos --> xor1
    cust_pos --> xor1
    
    space:3
    passcode_position_idx["passcode poition indices:\n{{passcode_position_idxs}}"]
    propidx --> passcode_position_idx
    
    space:5
    pad1(("Pad with\nrandom indices"))
    passcode_position_idx --> pad1
          
    space:5
    posidx["Padded Passcode Position Indices:\n{{pad_user_passcode_idxs}}"]
    pad1 --> posidx
    space:1
    user_pos["user position key:\n{{user_position_key}}"]
    xor1 --> user_pos
    
    space:4
    sel(("select positions"))
    user_pos --> sel
    posidx --> sel
    space:5
    passcode_pos["ordered user passcode positions:\n{{ordered_user_position_key}}"]
    sel --> passcode_pos
    mask_key["mask key\n{{mask_key}}"]
    space:4
    xor2(("XOR"))
    mask_key --> xor2
    passcode_pos --> xor2
    space:5
    mask["enciphered mask:\n {{mask}}"]
    xor2 --> mask
```

### Validate nKode

```mermaid
block-beta
    columns 4
    selected_keys["selected keys:\n{{selected_keys}}"]
    login_keypad["login keypad:\n{{login_keypad}}"]
    mask["enciphered mask:\n {{mask}}"]
    mask_key["mask key:\n{{mask_key}}"]
    space:6
    
    user_position_key["user position key:\n{{user_position_key}}"]
    passcode_pos["ordered user passcode positions:\n{{ordered_user_position_key}}"]
    space:4 
    
    space:2
    get_passcode_idxs(("recover passcode\nposition indices"))
    space:7
    
    passcode_pos_idxs["padded passcode position indices:\n{{pad_user_passcode_idxs}}"]
    space:5
    
    get_presumed_idxs(("recover passcode\nproperty indices")) 
    space:7
    
    passcode_prop_idxs["presumed passcode property indices:\n{{user_passcode_idxs}}"]
    space:7
    
    sel(("select\nproperties"))
    space:1
    prop["combined_property_key\n{{combined_property_key}}"]
    space:5
    passcode_prop["presumed passcode properties:\n{{user_passcode_props}}"]
    space:1
    cipheredhashed["hashed ciphered passcode:\n{{code}}"]
    space:6
    
    comp(("compare"))
    
```