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;-----------------------------------------------------------------------------;
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; Author: Michael Schierl (schierlm[at]gmx[dot]de)
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; Version: 1.0 (29 December 2012)
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;-----------------------------------------------------------------------------;
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;
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; c1 = OpenSSL::Cipher::Cipher.new('RC4')
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; c1.encrypt
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; c1.key="Hello, my world!"
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; c1.update("This is some magic data you may want to have encoded and decoded again").unpack("H*")
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;
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; => "882353c5de0f5e6b10bf0d25c432c5d16424dc797e895f37f261c893b31d577e7e69f77e07aa576d58c7f757164e7d74988feb10f972b28dcfa1e3a2b1cc0b0fa1a8b116294b"
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;
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; c1 = OpenSSL::Cipher::Cipher.new('RC4')
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; c1.decrypt
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; c1.key="Hello, my world!"
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; c1.update(["882353c5de0f5e6b10bf0d25c432c5d16424dc797e895f37f261c893b31d577e7e69f77e07aa576d58c7f757164e7d74988feb10f972b28dcfa1e3a2b1cc0b0fa1a8b116294b"].pack("H*"))
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;
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; => "This is some magic data you may want to have encoded and decoded again"
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;
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[BITS 32]
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[ORG 0]
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  cld                    ; Clear the direction flag.
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  call pushkey           ; push the address of the key onto the stack
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  db "Hello, my world!"
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pushkey:
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  pop esi                ; and store it into ESI
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  call pushdata          ; push the address of the encrypted data on the stack
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  db 0x88, 0x23, 0x53, 0xc5, 0xde, 0x0f, 0x5e, 0x6b, 0x10, 0xbf, 0x0d, 0x25, 0xc4, 0x32, 0xc5, 0xd1, 0x64, 0x24, 0xdc, 0x79, 0x7e, 0x89, 0x5f, 0x37, 0xf2, 0x61, 0xc8, 0x93, 0xb3, 0x1d, 0x57, 0x7e, 0x7e, 0x69, 0xf7, 0x7e, 0x07, 0xaa, 0x57, 0x6d, 0x58, 0xc7, 0xf7, 0x57, 0x16, 0x4e, 0x7d, 0x74, 0x98, 0x8f, 0xeb, 0x10, 0xf9, 0x72, 0xb2, 0x8d, 0xcf, 0xa1, 0xe3, 0xa2, 0xb1, 0xcc, 0x0b, 0x0f, 0xa1, 0xa8, 0xb1, 0x16, 0x29, 0x4b
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pushdata:
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  pop ebp                ; and store it into EBP
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  mov ecx, 70            ; store data length into ECX
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  sub esp, 0x100         ; make space on stack for S-Box
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  mov edi, esp           ; and store address into EDI
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  nop
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  nop
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  nop
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  int 3                  ; for stepping through the code
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                         ; let's run the RC4 decoder
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%include "./src/block/block_rc4.asm"
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  int 3                  ; EBP should point to decoded data now
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