I want to write the TEA algorithm in assembly 8086 (TASM), and I am stuck in the first steps of splitting the plaintext (the block ) variable into 2 variables and the key into 4 variables (k1, k2, k3, k4).
I know the limit of the plaintext (block) is 64 bits (8 bytes)
and the limit of the key is 128 bits (16 bits).

The plaintext variable is stored in the ds:

plainText db 8 dup('$')

this is the two variables of the plaintext:

p1 db 4 dup('$')

p2 db 4 dup('$')

The key variable is stored like this:

key db 16 dup("$")

macro inputString storage
    pusha
    mov ah, 0ah
    lea dx, storage
    int 21h
    popa
endm inputString

and the 4 split keys:

k0 db ?

k1 db ?

k2 db ?

k3 db ?

this is my currently encryption section for taking the input from the user:

proc encryptionSelection
    print plainTextPrompt
    inputString [plainText] ; Block Limit: 64 bits -> 8 bytes

    call printLine
    print p1
    call printLine
    print p2

    print keyPrompt
    inputString [key] ; Key Limit:  128 bits -> 16 bytes

    ; Encryption Logic Here...
    ret
endp encryptionSelection

macro inputString storage
    pusha
    mov ah, 0ah
    lea dx, storage
    int 21h
    popa
endm inputString

macro print value
    pusha
    mov ah, 09h
    mov dx, offset value
    int 21h
    popa

endm print

I tried many ways and gogled a lot, but I couldn’t find any solutions.