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После долгих мучений нашел все же нужный код.

	/* encrypt code
	ecx = buffer
	esi = 0x11cfd
	edi = 0

	.text:01411800 loc_1411800:                            ; CODE XREF: Encrypt1+42j
	.text:01411800                 mov     al, [edi+ecx]   ; ecx = buffer
	.text:01411803                 mov     edx, esi
	.text:01411805                 sar     edx, 8
	.text:01411808                 xor     al, dl
	.text:0141180A                 mov     [ecx], al
	.text:0141180C                 movzx   eax, al
	.text:0141180F                 add     eax, esi
	.text:01411811                 imul    eax, 0CE6Dh
	.text:01411817                 add     eax, 58BFh
	.text:0141181C                 inc     ecx
	.text:0141181D                 sub     ebp, 1
	.text:01411820                 mov     esi, eax
	.text:01411822                 jnz     short loc_1411800 ; ecx = buffer

	*/