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