aliddin

.data
msg:    .string "If result is 1 Matrikelnummer is valid otherwise invalid. Result: %d\n"
# number: abcdefg, valid if (a * 9 + b * 7 + c * 3 + d * 9 + e * 7 + f * 3) mod 10 = g

.text
.global main

main:
    movl $611813,%eax
    movl $10, %ebx
    movl $0, %ecx
    movl $0, %edi

    cdq
    idivl %ebx
    movl %edx, %edi     # edi = g (1st digit)

    idivl %ebx
    imull $3, %edx      # f*3
    movl %edx, %ecx     # ecx = f*3 (2nd digit)


    idivl %ebx
    imull $7, %edx      # e*7
    addl %edx, %ecx     # ecx = f*3 + e*7 (3rd digit)

    idivl %ebx
    imull $9, %edx      # d*9
    addl %edx, %ecx     # ecx = f*3 + e*7 + d*9 (4th digit)

    idivl %ebx
    imull $3, %edx      # c*3
    addl %edx, %ecx     # ecx = f*3 + e*7 + d*9 + c*3 (5th digit)

    idivl %ebx
    imull $7, %edx      # b*7
    addl %edx, %ecx     # ecx = f*3 + e*7 + d*9 + c*3 + b*7 (6th digit)

    idivl %ebx
    imull $9, %edx      # a*9
    addl %edx, %ecx     # ecx = f*3 + e*7 + d*9 + c*3 + b*7 + a*9 (7th)

    movl %ecx, %eax
    idivl %ebx

    cmpl %edi, %edx
    je .valid
    movl $0, %eax
    jmp .invalid

.valid:
    movl $1, %eax

.invalid:

    pushl %eax
    pushl $msg
    call printf

    movl $0, %eax
    int $0x80