Function at 0x140099310
Capabilities:
Encode data using xor
Generate random numbers using a mersenne twister

Disassembly:
mov qword [rsp + 0x10], rbx
mov qword [rsp + 0x18], rsi
push rbp
push rdi
push r12
push r13
push r15
lea rbp, [rsp - 0x1cc0]
mov eax, 0x1dc0
call fcn.14011eb00
sub rsp, rax
mov rax, qword [0x140185fc0]
xor rax, rsp
mov qword [rbp + 0x1cb0], rax
mov rdi, rcx
mov qword [rsp + 0x38], rcx
mov dword [rsp + 0x20], 0
call sub.MSVCP140.dll_unsigned_int___cdecl_std::_Random_device_void_
mov dword [rsp + 0x28], eax
call sub.MSVCP140.dll_unsigned_int___cdecl_std::_Random_device_void_
mov dword [rsp + 0x2c], eax
call sub.MSVCP140.dll_unsigned_int___cdecl_std::_Random_device_void_
mov dword [rsp + 0x30], eax
call sub.MSVCP140.dll_unsigned_int___cdecl_std::_Random_device_void_
mov dword [rsp + 0x34], eax
xorps xmm0, xmm0
movdqu xmmword [rbp + 0x900], xmm0
xor ecx, ecx
mov qword [rbp + 0x910], rcx
lea rbx, [rsp + 0x28]
mov rdx, qword [rbp + 0x908]
nop dword [rax]
cmp rdx, rcx
je 0x1400993b6
mov eax, dword [rbx]
mov dword [rdx], eax
add rdx, 4
mov qword [rbp + 0x908], rdx
jmp 0x1400993d3
mov r8, rbx
lea rcx, [rbp + 0x900]
call fcn.140014d90
mov rcx, qword [rbp + 0x910]
mov rdx, qword [rbp + 0x908]
add rbx, 4
lea rax, [rsp + 0x38]
cmp rbx, rax
jne 0x1400993a0
mov dword [rbp + 0x1ca4], 0xffffffff
mov edx, 0x1571
mov dword [rbp + 0x924], edx
mov ecx, 1
nop dword [rax + rax]
mov eax, edx
shr eax, 0x1e
xor eax, edx
imul edx, eax, 0x6c078965
add edx, ecx
mov dword [rbp + rcx*4 + 0x924], edx
inc rcx
cmp rcx, 0x270
jb 0x140099400
lea r8, [rbp + 0x900]
lea rdx, [rsp + 0x40]
lea rcx, [rbp + 0x900]
call fcn.140075930
xor edx, edx
xor r8d, r8d
nop
mov eax, dword [rsp + r8*4 + 0x40]
mov dword [rbp + r8*4 + 0x924], eax
mov ecx, eax
or ecx, edx
mov edx, eax
shr edx, 0x1f
test r8, r8
cmovne edx, ecx
inc r8
cmp r8, 0x270
jb 0x140099440
mov eax, dword [rbp + 0x924]
mov r15d, 0x80000000
test edx, edx
cmove eax, r15d
mov dword [rbp + 0x924], eax
mov ebx, 0x270
mov dword [rbp + 0x920], ebx
xorps xmm0, xmm0
movups xmmword [rdi], xmm0
mov qword [rdi + 0x10], 0
mov qword [rdi + 0x18], 0
mov r8d, Ordinal_27
lea rdx, str.__cpp_httplultipart_data_
mov rcx, rdi
call fcn.140012850
mov dword [rsp + 0x20], 1
mov esi, reloc.WS2_32.dll_recv
movabs r12, 0x842108421084211
lea r13, [0x14014fd80]
cmp ebx, 0x270
jne 0x140099537
lea rax, [rbp + 0x928]
mov r9d, ebx
nop word [rax + rax]
mov r8d, dword [rax - 4]
xor r8d, dword [rax]
btr r8d, 0x1f
xor r8d, dword [rax - 4]
mov ecx, r8d
and cl, 1
neg cl
sbb edx, edx
and edx, 0x9908b0df
xor edx, dword [rax + 0x630]
shr r8d, 1
xor edx, r8d
mov dword [rax + 0x9bc], edx
lea rax, [rax + 4]
sub r9, 1
jne 0x1400994f0
mov ebx, dword [rbp + 0x920]
jmp 0x140099613
cmp ebx, 0x4e0
jb 0x140099613
xor r8d, r8d
mov eax, dword [rbp + r8*4 + 0x12e4]
mov edx, eax
xor edx, dword [rbp + r8*4 + 0x12e8]
btr edx, 0x1f
xor edx, eax
mov eax, edx
and al, 1
neg al
sbb ecx, ecx
and ecx, 0x9908b0df
xor ecx, dword [rbp + r8*4 + 0x1918]
shr edx, 1
xor ecx, edx
mov dword [rbp + r8*4 + 0x924], ecx
inc r8
cmp r8, 0xe3
jb 0x140099546
mov r8d, 0xe3
mov eax, dword [rbp + r8*4 + 0x12e4]
mov edx, eax
xor edx, dword [rbp + r8*4 + 0x12e8]
btr edx, 0x1f
xor edx, eax
mov eax, edx
and al, 1
neg al
sbb ecx, ecx
and ecx, 0x9908b0df
xor ecx, dword [rbp + r8*4 + 0x598]
shr edx, 1
xor ecx, edx
mov dword [rbp + r8*4 + 0x924], ecx
inc r8
cmp r8, 0x26f
jb 0x140099592
mov edx, dword [rbp + 0x1ca0]
and edx, r15d
mov eax, dword [rbp + 0x924]
btr eax, 0x1f
or edx, eax
mov eax, edx
and al, 1
neg al
sbb ecx, ecx
and ecx, 0x9908b0df
shr edx, 1
xor ecx, edx
xor ecx, dword [rbp + 0xf54]
mov dword [rbp + 0x12e0], ecx
xor ebx, ebx
mov dword [rbp + 0x920], ebx
mov eax, ebx
mov ecx, dword [rbp + rax*4 + 0x924]
inc ebx
mov dword [rbp + 0x920], ebx
mov eax, ecx
shr eax, 0xb
and eax, dword [rbp + 0x1ca4]
xor ecx, eax
mov eax, ecx
and eax, 0xff3a58ad
shl eax, 7
xor ecx, eax
mov eax, ecx
and eax, 0xffffdf8c
shl eax, 0xf
xor ecx, eax
mov eax, ecx
shr eax, 0x12
xor ecx, eax
mov rax, r12
mul rcx
mov eax, ecx
sub rax, rdx
shr rax, 1
add rax, rdx
shr rax, 5
imul rax, rax, 0x3e
sub rcx, rax
movzx r9d, byte [rcx + r13]
mov rcx, qword [rdi + 0x10]
mov rdx, qword [rdi + 0x18]
cmp rcx, rdx
jae 0x14009969d
lea rax, [rcx + 1]
mov qword [rdi + 0x10], rax
mov rax, rdi
cmp rdx, 0xf
jbe 0x140099692
mov rax, qword [rdi]
mov byte [rax + rcx], r9b
mov byte [rax + rcx + 1], 0
jmp 0x1400996ac
xor r8d, r8d
lea edx, [r8 + 1]
mov rcx, rdi
call fcn.1400163c0
sub rsi, 1
jne 0x1400994d4
mov rcx, qword [rbp + 0x900]
test rcx, rcx
je 0x1400996fd
mov rdx, qword [rbp + 0x910]
sub rdx, rcx
and rdx, 0xfffffffffffffffc
mov rax, rcx
cmp rdx, 0x1000
jb 0x1400996f8
add rdx, 0x27
mov rcx, qword [rcx - 8]
sub rax, rcx
add rax, 0xfffffffffffffff8
cmp rax, 0x1f
jbe 0x1400996f8
call qword [sym.imp.api_ms_win_crt_runtime_l1_1_0.dll__invalid_parameter_noinfo_noreturn]
int3
call fcn.14011e4d4
mov rax, rdi
mov rcx, qword [rbp + 0x1cb0]
xor rcx, rsp
call fcn.14011e5f0
lea r11, [rsp + 0x1dc0]
mov rbx, qword [r11 + 0x38]
mov rsi, qword [r11 + 0x40]
mov rsp, r11
pop r15
pop r13
pop r12
pop rdi
pop rbp
ret