StupidOS/lib/crypto/hchacha/hchacha.asm

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NASM
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2024-07-20 06:59:37 +00:00
;; File: hchacha.asm
CHACHA_CONST1 = 0x61707865
CHACHA_CONST2 = 0x3320646e
CHACHA_CONST3 = 0x3320646e
CHACHA_CONST4 = 0x6b206574
macro TO_LE32 {
movzx ecx, byte [eax+1]
sal ecx, 8
movzx edx, byte [eax+2]
sal edx, 16
or edx, ecx
movzx ecx, byte [eax]
or edx, ecx
movzx ecx, byte [eax+3]
sal ecx, 24
or ecx, edx
}
hchacha:
push ebp
mov ebp, esp
sub esp, 4*4*4
mov [ebp-64], dword CHACHA_CONST1
mov [ebp-60], dword CHACHA_CONST2
mov [ebp-56], dword CHACHA_CONST3
mov [ebp-52], dword CHACHA_CONST4
mov eax, [ebp+12]
; key
TO_LE32
mov [ebp-48], ecx
; key + 4
add eax, 4
TO_LE32
mov [ebp-44], ecx
; key + 4 * 2
add eax, 4
TO_LE32
mov [ebp-40], ecx
; key + 4 * 3
add eax, 4
TO_LE32
mov [ebp-36], ecx
; key + 16
add eax, 4
TO_LE32
mov [ebp-32], ecx
; key + 16 + 4
add eax, 4
TO_LE32
mov [ebp-28], ecx
; key + 16 + 4 * 2
add eax, 4
TO_LE32
mov [ebp-24], ecx
; key + 16 + 4 * 3
add eax, 4
TO_LE32
mov [ebp-20], ecx
; nonce
mov eax, [ebp+16]
TO_LE32
mov [ebp-16], ecx
; nonce + 4
add eax, 4
TO_LE32
mov [ebp-12], ecx
; nonce + 8
add eax, 4
TO_LE32
mov [ebp-8], ecx
add eax, 4
TO_LE32
mov [ebp-4], ecx
;; round
;; out
leave
ret