461 lines
9.8 KiB
NASM
461 lines
9.8 KiB
NASM
;
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; áèáëèîòåêà äëÿ øèôðîâàíèÿ ïî àëãîðèòìó DES
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;
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format MS COFF
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public EXPORTS
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section '.flat' code readable align 16
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include '../../../../macros.inc'
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include '../../../../proc32.inc'
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;description:
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; ôóíêöèÿ øèôðîâàíèÿ ôàéëîâ
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;input:
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; key - âõîäíîé êëþ÷ 64 áèò
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; mem_keys - ïàìÿòü äëÿ ôîðìèðîâàíèÿ êëþ÷åé (ðàçìåð 120 áàéò)
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; block - óêàçàòåëü íà ïåðâûé øèôðóåìûé 8 áàéòíûé áëîê
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; b_count - ÷èñëî áëîêîâ äëÿ øèôðîâàíèÿ
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align 4
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proc des_encryption, key:dword, mem_keys:dword, block:dword, b_count:dword
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locals
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n dd ? ;ïåðåìåííàÿ öèêëà
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endl
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pushad
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stdcall encryption_key, [key],[mem_keys]
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;íà÷àëüíàÿ ïåðåñòàíîâêà ip
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mov ecx,[b_count]
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cmp ecx,1
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jl .end_funct
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mov edi,[block]
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cld
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@@:
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mov esi,[mem_keys]
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add esi,112
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stdcall fun_convert_bits, edi, esi, oper_ip, 64
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movsd
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movsd
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loop @b
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mov ecx,[b_count]
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mov esi,[block]
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;cld
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.cycle_3:
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mov dword[n],0
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.funct_f:
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mov edi,[mem_keys]
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add edi,112
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;ïåðåñòàâëÿåì áëîê R0(32) ïî ìàòðèöå e
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stdcall fun_convert_bits, esi, edi, oper_e, 48
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;edi - R0~e (48 áèò)
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;esi - L0R0 (64 áèòà)
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stdcall fun_r0xorki_si, edi,[mem_keys],[n]
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;edi - (R0~e xor ki)~Si (32 áèòà)
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;ïåðåñòàíîâêà p
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mov eax,edi
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add eax,4
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stdcall fun_convert_bits, edi, eax, oper_p, 32
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;ïèøåì R0 â L0, è (L0 xor (R0~e xor ki)~Si) â R0
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mov edx,dword[esi+4]
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mov ebx,dword[esi]
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xor edx,dword[eax]
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mov dword[esi],edx
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mov dword[esi+4],ebx
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inc dword[n]
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cmp dword[n],16
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jl .funct_f
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add esi,8 ;ïåðåõîä íà ñëåäóþùèé 64 áèòíûé øèôðóåìûé áëîê
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loop .cycle_3
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;êîíå÷íàÿ ïåðåñòàíîâêà ip_inv
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mov ecx,[b_count]
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mov edi,[block]
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;cld
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@@:
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mov esi,[mem_keys]
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add esi,112
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stdcall fun_convert_bits, edi, esi, oper_ip_inv, 64
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movsd
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movsd
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loop @b
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.end_funct:
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popad
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ret
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endp
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;description:
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; ôóíêöèÿ ðàñøèôðîâàíèÿ ôàéëîâ
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;input:
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; key - âõîäíîé êëþ÷ 64 áèò
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; mem_keys - ïàìÿòü äëÿ ôîðìèðîâàíèÿ êëþ÷åé (ðàçìåð 120 áàéò)
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; block - óêàçàòåëü íà ïåðâûé ðàñøèôðîâûâàåìûé 8 áàéòíûé áëîê
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; b_count - ÷èñëî áëîêîâ äëÿ ðàñøèôðîâàíèÿ
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align 4
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proc des_decryption, key:dword, mem_keys:dword, block:dword, b_count:dword
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locals
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n dd ? ;ïåðåìåííàÿ öèêëà
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endl
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pushad
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stdcall encryption_key, [key],[mem_keys]
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;íà÷àëüíàÿ ïåðåñòàíîâêà ip
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mov ecx,[b_count]
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cmp ecx,1
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jl .end_funct
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mov edi,[block]
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cld
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@@:
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mov esi,[mem_keys]
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add esi,112
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stdcall fun_convert_bits, edi, esi, oper_ip, 64
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movsd
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movsd
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loop @b
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mov ecx,[b_count]
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mov esi,[block]
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;cld
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.cycle_3:
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mov dword[n],16
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.funct_f:
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dec dword[n]
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mov edi,[mem_keys]
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add edi,112
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;ïåðåñòàâëÿåì áëîê L0(32) ïî ìàòðèöå e
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add esi,4
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stdcall fun_convert_bits, esi, edi, oper_e, 48
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sub esi,4
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;edi - L0~e (48 áèò)
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;esi - L0R0 (64 áèòà)
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stdcall fun_r0xorki_si, edi,[mem_keys],[n]
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;edi - (L0~e xor ki)~Si (32 áèòà)
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;ïåðåñòàíîâêà p
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mov eax,edi
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add eax,4
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stdcall fun_convert_bits, edi, eax, oper_p, 32
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;ïèøåì L0 â R0, è (R0 xor (L0~e xor ki)~Si) â L0
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mov edx,dword[esi]
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mov ebx,dword[esi+4]
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xor edx,dword[eax]
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mov dword[esi+4],edx
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mov dword[esi],ebx
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cmp dword[n],0
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jg .funct_f
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add esi,8 ;ïåðåõîä íà ñëåäóþùèé 64 áèòíûé øèôðóåìûé áëîê
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loop .cycle_3
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;êîíå÷íàÿ ïåðåñòàíîâêà ip_inv
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mov ecx,[b_count]
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mov edi,[block]
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;cld
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@@:
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mov esi,[mem_keys]
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add esi,112
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stdcall fun_convert_bits, edi, esi, oper_ip_inv, 64
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movsd
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movsd
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loop @b
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.end_funct:
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popad
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ret
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endp
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;description:
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; ïåðåñòàíîâêà áèòîâ ïî óêàùàííîé ìàòðèöå
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;input:
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; m_inp - ïàìÿòü ñ èñõîäíûìè äàííûìè
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; m_out - ïàìÿòü äëÿ ïðåîáðàçîâàííûõ äàííûõ
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; c_tbl - òàáëèöà äëÿ ïåðåñòàíîâêè
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; tbl_s - ðàçìåð òàáëèöû äëÿ ïåðåñòàíîâêè
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align 4
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proc fun_convert_bits, m_inp:dword, m_out:dword, c_tbl:dword, tbl_s:dword
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pushad
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mov esi,[m_inp]
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mov edi,[m_out]
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mov eax,[c_tbl]
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mov ecx,[tbl_s]
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xor edx,edx
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mov dword[edi],edx
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cmp ecx,32
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jle @f
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mov dword[edi+4],edx
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@@:
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inc edx
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cld
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.cycle_0:
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movzx ebx,byte[eax]
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btr ebx,5
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jc .tbl_h
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bt dword[esi],ebx
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jnc @f
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or dword[edi],edx
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@@:
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jmp @f
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.tbl_h:
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bt dword[esi+4],ebx
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jnc @f
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or dword[edi],edx
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@@:
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rol edx,1
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jnc @f
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add edi,4
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@@:
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inc eax
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loop .cycle_0
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popad
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ret
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endp
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;description:
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; ñëîæåíèå R0(48) xor Ki(48) è 8 ïðåîáðàçîâàíèé ïî Si
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;intput:
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; data_r0 - R0 (48 áèò)
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; data_key - óêàçàòåëü íà ìàññèâ êëþ÷åé (ïî 48 áèò)
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; n - íîìåð êëþ÷à â ìàññèâå
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;output:
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; data_r0 - (R0 xor Ki)~Si (32 áèòà)
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align 4
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proc fun_r0xorki_si, data_r0:dword, data_key:dword, n:dword
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pushad
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mov edi,[data_r0]
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mov eax,[n]
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imul eax,7 ;56 áèò - ðàññòîÿíèå ìåæäó êëþ÷àìè (ñàìè êëþ÷è 48 áèò)
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add eax,[data_key]
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mov ebx,dword[eax]
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xor dword[edi],ebx
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mov ebx,dword[eax+4] ;mov bx,word[eax+4]
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xor dword[edi+4],ebx ;xor word[edi+4],bx
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;edi - óêàçàòåëü íà çíà÷åíèå R0 xor Ki
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mov eax,dword[edi]
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mov ebx,dword[edi+4]
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;bx:eax - 48 áèò çíà÷åíèå R0 xor Ki
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lea esi,[oper_s] ;âûáèðàåì òàáëèöó S0
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mov ecx,8
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.cycle_0:
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mov dl,al
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and edx,31
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shr dl,1
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jnc @f
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bts edx,4
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@@:
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bt eax,5
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jnc @f
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bts edx,5
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@@:
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add edx,esi
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mov dl,byte[edx] ;dl - 4 áèòíîå çíà÷åíèå ïîëó÷åííîå èç Si
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bt ecx,0
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jc @f
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;1) ecx - ÷åòíûé
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mov byte[edi],dl
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jmp .next
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@@:
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;2) ecx - íå ÷åòíûé
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shl dl,4
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or byte[edi],dl
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inc edi
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.next:
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shr eax,6
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ror ebx,6
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mov edx,ebx
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and edx,0xfc000000
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or eax,edx
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;èëè 6 ðàç: shr ebx,1 rcr eax,1
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add esi,64 ;ïåðåõîäèì íà ñëåäóþùóþ òàáëèöó Si
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loop .cycle_0
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popad
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ret
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endp
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;description:
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; ïðîöåäóðà ôîðìèðîâàíèÿ êëþ÷åé äëÿ øèôðîâàíèÿ
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;intput:
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; key - âõîäíîé êëþ÷ 64 áèò
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; key_b - 16 ïðåîáðàçîâàííûõ êëþ÷åé ïî 48 áèò
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; ðàçìåð ïàìÿòè key_b äîëæåí áûòü íå ìåíüøå 120 áàéò
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align 4
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proc encryption_key, key:dword, key_b:dword
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pushad
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mov esi,[key]
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mov edi,[key_b]
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;ïåðåñòàâëÿåì âõîäíîé êëþ÷ ïî ìàòðèöå
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stdcall fun_convert_bits, esi, edi, oper_b, 56
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;â ebx íàõîäèì C0
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mov ebx,dword[edi]
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and ebx,0xfffffff
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;â edx íàõîäèì D0
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mov edx,dword[edi+3]
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shr edx,4
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;íàõîäèì 16 ïîäêëþ÷åé, äëèííîé ïî 56 áèò
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;;;mov edi,[key_b]
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lea esi,[oper_r]
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.cycle_1:
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mov cl,byte[esi]
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cmp cl,0
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je .cycle_end
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shl ebx,cl
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btr ebx,28
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jnc @f
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or ebx,1
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@@:
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btr ebx,29
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jnc @f
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or ebx,2
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@@:
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shl edx,cl
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btr edx,28
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jnc @f
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or edx,1
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@@:
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btr edx,29
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jnc @f
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or edx,2
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@@:
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mov dword[edi+3],0
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mov dword[edi],ebx
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shl edx,4
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or dword[edi+3],edx
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add edi,7
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shr edx,4
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inc esi
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jmp .cycle_1
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.cycle_end:
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;ñæàòèå êëþ÷åé ñ 56 äî 48 áèò
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mov edi,[key_b]
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mov esi,edi
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add esi,112 ;112 - àäðåñ çà ïðåäåëàìè 16*7
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mov ecx,16
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cld
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@@:
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stdcall fun_convert_bits, edi, esi, oper_c, 48
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movsd
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movsw
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mov byte[edi],0 ;îáðåçàåì 7-é áàéò
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inc edi
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sub esi,6
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loop @b
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popad
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ret
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endp
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align 4
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oper_ip db 57,49,41,33,25,17,9,1,59,51,43,35,27,19,11,3,\
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61,53,45,37,29,21,13, 5,63,55,47,39,31,23,15, 7,\
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56,48,40,32,24,16, 8, 0,58,50,42,34,26,18,10, 2,\
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60,52,44,36,28,20,12, 4,62,54,46,38,30,22,14, 6
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align 4
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oper_ip_inv db 39,7,47,15,55,23,63,31,38,6,46,14,54,22,62,30,\
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37, 5,45,13,53,21,61,29,36, 4,44,12,52,20,60,28,\
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35, 3,43,11,51,19,59,27,34, 2,42,10,50,18,58,26,\
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33, 1,41, 9,49,17,57,25,32, 0,40, 8,48,16,56,24
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align 4
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oper_e db 31,0,1,2,3,4,\
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3, 4, 5, 6, 7, 8,\
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7, 8, 9,10,11,12,\
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11,12,13,14,15,16,\
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15,16,17,18,19,20,\
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19,20,21,22,23,24,\
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23,24,25,26,27,28,\
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27,28,29,30,31, 0
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align 4
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oper_b db 56,48,40,32,24,16,8,\
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0,57,49,41,33,25,17,\
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9, 1,58,50,42,34,26,\
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18,10, 2,59,51,43,35,\
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62,54,46,38,30,22,14,\
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6,61,53,45,37,29,21,\
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13, 5,60,52,44,36,28,\
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20,12, 4,27,19,11, 3
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oper_r db 1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1,0
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align 4
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oper_c db 13,16,10,23,0,4,\
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2,27,14, 5,20, 9,\
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22,18,11, 3,25, 7,\
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15, 6,26,19,12, 1,\
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40,51,30,36,46,54,\
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29,39,50,44,32,47,\
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43,48,38,55,33,52,\
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45,41,49,35,28,31
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align 4
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oper_s db 14,4,13,1,2,15,11,8,3,10,6,12,5,9,0,7,\
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0,15, 7, 4,14, 2,13,1,10,6,12,11,9,5,3,8,\
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4, 1,14, 8,13, 6,2,11,15,12,9,7,3,10,5,0,\
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15,12, 8, 2, 4, 9,1,7,5,11,3,14,10,0,6,13,\
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15, 1, 8,14, 6,11,3,4,9,7,2,13,12,0,5,10,\
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3,13, 4, 7,15, 2,8,14,12,0,1,10,6,9,11,5,\
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0,14, 7,11,10, 4,13,1,5,8,12,6,9,3,2,15,\
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13, 8,10, 1, 3,15,4,2,11,6,7,12,0,5,14,9,\
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10, 0, 9,14, 6, 3,15,5,1,13,12,7,11,4,2,8,\
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13, 7, 0, 9, 3, 4,6,10,2,8,5,14,12,11,15,1,\
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13, 6, 4, 9, 8,15,3,0,11,1,2,12,5,10,14,7,\
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1,10,13, 0, 6, 9,8,7,4,15,14,3,11,5,2,12,\
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7,13,14, 3, 0, 6,9,10,1,2,8,5,11,12,4,15,\
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13, 8,11, 5, 6,15,0,3,4,7,2,12,1,10,14,9,\
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10, 6, 9, 0,12,11,7,13,15,1,3,14,5,2,8,4,\
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3,15, 0, 6,10, 1,13,8,9,4,5,11,12,7,2,14,\
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2,12, 4, 1, 7,10,11,6,8,5,3,15,13,0,14,9,\
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14,11, 2,12, 4, 7,13,1,5,0,15,10,3,9,8,6,\
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4, 2, 1,11,10,13,7,8,15,9,12,5,6,3,0,14,\
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11, 8,12, 7, 1,14,2,13,6,15,0,9,10,4,5,3,\
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12, 1,10,15, 9, 2,6,8,0,13,3,4,14,7,5,11,\
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10,15, 4, 2, 7,12,9,5,6,1,13,14,0,11,3,8,\
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9,14,15, 5, 2, 8,12,3,7,0,4,10,1,13,11,6,\
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4, 3, 2,12, 9, 5,15,10,11,14,1,7,6,0,8,13,\
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4,11, 2,14,15, 0,8,13,3,12,9,7,5,10,6,1,\
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13, 0,11, 7, 4, 9,1,10,14,3,5,12,2,15,8,6,\
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1, 4,11,13,12, 3,7,14,10,15,6,8,0,5,9,2,\
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6,11,13, 8, 1, 4,10,7,9,5,0,15,14,2,3,12,\
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13, 2, 8, 4, 6,15,11,1,10,9,3,14,5,0,12,7,\
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1,15,13, 8,10, 3,7,4,12,5,6,11,0,14,9,2,\
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7,11, 4, 1, 9,12,14,2,0,6,10,13,15,3,5,8,\
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2, 1,14, 7, 4,10,8,13,15,12,9,0,3,5,6,11
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align 4
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oper_p db 15,6,19,20,28,11,27,16,\
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0,14,22,25, 4,17,30, 9,\
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1, 7,23,13,31,26, 2, 8,\
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18,12,29, 5,21,10, 3,24
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align 16
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EXPORTS:
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dd sz_des_encryption, des_encryption
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dd sz_des_decryption, des_decryption
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dd 0,0
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sz_des_encryption db 'des_encryption',0
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sz_des_decryption db 'des_decryption',0
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