Function at 0x58a680
Capabilities:
Encode data using base64
Reference http user-agent string

Disassembly:
cmp rsp, qword [r14 + 0x10]
jbe 0x58ab2e
push rbp
mov rbp, rsp
sub rsp, 0x50
mov qword [rsp + 0x88], r8
mov qword [rsp + 0x78], rdi
mov qword [rsp + 0x70], rcx
test rbx, rbx
jne 0x58a6bb
mov rdx, rdi
xor ebx, ebx
xor esi, esi
xor r11d, r11d
xor r12d, r12d
jmp 0x58a81d
nop
nop dword [rax]
cmp rbx, 0x14
jae 0x58ab1a
mov rdx, qword [0x0089c778]
cmp rbx, rdx
jae 0x58ab0f
mov qword [rsp + 0x60], rax
mov qword [rsp + 0x98], r10
mov qword [rsp + 0x90], r9
mov qword [rsp + 0x88], r8
mov rdx, qword [0x0089c770]
movzx edx, byte [rdx + rbx]
cmp rdi, rdx
je 0x58a765
nop
lea rax, [0x006870a0]
call fcn.0040d480
mov qword [rax + 8], 0x28
lea rcx, [0x006d22a4]
mov qword [rax], rcx
mov rcx, qword [rsp + 0x70]
mov rdx, qword [rsp + 0x78]
mov r8, qword [rsp + 0x88]
mov r9, qword [rsp + 0x90]
mov r10, qword [rsp + 0x98]
lea rbx, [0x00741740]
xor edi, edi
xor esi, esi
xor r11d, r11d
mov r12, rax
mov rax, qword [rsp + 0x60]
nop
jmp 0x58a81d
mov qword [rsp + 0x40], rdx
mov rdx, qword [0x008a67e0]
lea rax, [0x0067d900]
mov rcx, rbx
mov rbx, rdx
nop
call fcn.004111e0
test bl, bl
je 0x58a7c6
mov rdx, qword [rax]
mov rsi, qword [rax + 8]
mov rax, qword [rsp + 0x60]
mov rcx, qword [rsp + 0x70]
mov r8, qword [rsp + 0x88]
mov r9, qword [rsp + 0x90]
mov r10, qword [rsp + 0x98]
xor ebx, ebx
mov rdi, qword [rsp + 0x40]
mov r11, rdx
xor r12d, r12d
mov rdx, qword [rsp + 0x78]
jmp 0x58a81d
nop
lea rax, [0x006870a0]
call fcn.0040d480
mov qword [rax + 8], 0x25
lea rcx, [0x006d1039]
mov qword [rax], rcx
mov rcx, qword [rsp + 0x70]
mov rdx, qword [rsp + 0x78]
mov r8, qword [rsp + 0x88]
mov r9, qword [rsp + 0x90]
mov r10, qword [rsp + 0x98]
lea rbx, [0x00741740]
xor edi, edi
xor esi, esi
xor r11d, r11d
mov r12, rax
mov rax, qword [rsp + 0x60]
nop dword [rax]
test rbx, rbx
jne 0x58a9d6
mov r12, qword [rax]
mov r13, qword [r12 + 0x10]
lea r15, [r13 - 1]
lea rbx, [rdi + rsi]
nop
test r15, r15
jl 0x58a8a2
mov r12, qword [r12 + 8]
mov r12, qword [r12 + r13*8 - 8]
mov r13, r12
shr r12, 1
or r12, r13
mov r13, r12
shr r12, 2
or r12, r13
mov r13, r12
shr r12, 4
or r12, r13
mov r13, r12
shr r12, 8
or r12, r13
mov r13, r12
shr r12, 0x10
or r12, r13
mov r13, r12
shr r12, 0x20
or r12, r13
shl r15, 6
bsr r12, r12
mov r13, 0xffffffffffffffff
cmove r12, r13
lea r12, [r12 + r15]
lea r12, [r12 + 1]
jmp 0x58a8a5
xor r12d, r12d
lea r13, [rdi + rsi]
lea r13, [r13 + 0xb]
lea r15, [r12 + 7]
sar r15, 0x3f
shr r15, 0x3d
lea r12, [r15 + r12]
lea r12, [r12 + 7]
sar r12, 3
cmp r13, r12
jg 0x58a9c2
cmp r9, r12
jne 0x58a9ae
mov qword [rsp + 0x28], rdi
mov qword [rsp + 0x38], rbx
mov qword [rsp + 0x20], r12
mov qword [rsp + 0x48], r11
mov qword [rsp + 0x30], rsi
mov rbx, r8
mov rcx, r9
mov rdi, r10
nop dword [rax + rax]
call fcn.0058b880
test rdi, rdi
jne 0x58a99a
test rbx, rbx
jbe 0x58ab05
nop word [rax + rax]
cmp rbx, 1
jbe 0x58aaf5
movzx esi, byte [rax]
movzx edi, byte [rax + 1]
dec esi
shr esi, 0x1f
xor edi, 1
movzx edi, dil
dec edi
shr edi, 0x1f
and rsi, rdi
mov rdi, qword [rsp + 0x20]
mov r8, qword [rsp + 0x28]
mov r9, rdi
sub rdi, r8
cmp rcx, r9
jb 0x58aaea
nop
cmp r9, rdi
jb 0x58aadf
mov rdx, r9
sub r9, rdi
mov r8, rdi
sub rdi, rcx
sar rdi, 0x3f
and rdi, r8
add rdi, rax
mov r10, qword [rsp + 0x78]
cmp r10, r9
je 0x58a98d
xor edi, edi
jmp 0x58aa04
mov r10, qword [rsp + 0x70]
xor r11d, r11d
xor r12d, r12d
jmp 0x58a9f5
mov rax, qword [0x0089a650]
mov rbx, qword [0x0089a658]
add rsp, 0x50
pop rbp
ret
mov rax, qword [0x0089a650]
mov rbx, qword [0x0089a658]
add rsp, 0x50
pop rbp
ret
mov rax, qword [0x0089a650]
mov rbx, qword [0x0089a658]
add rsp, 0x50
pop rbp
ret
mov rax, rbx
mov rbx, r12
add rsp, 0x50
pop rbp
ret
movzx r13d, byte [r11 + rdi]
movzx r15d, byte [r10 + r11]
xor r15d, r13d
inc r11
or r12d, r15d
cmp r11, r9
jl 0x58a9e2
movzx edi, r12b
dec edi
nop
shr edi, 0x1f
mov r9, qword [rsp + 0x38]
sub rdx, r9
and rdi, rsi
cmp rdx, r8
ja 0x58aad4
sub r8, rdx
mov rsi, rdx
sub rdx, rcx
sar rdx, 0x3f
and rdx, rsi
add rdx, rax
mov r9, qword [rsp + 0x30]
cmp r9, r8
je 0x58aa39
xor edx, edx
jmp 0x58aa67
mov r9, qword [rsp + 0x48]
xor ecx, ecx
xor r10d, r10d
jmp 0x58aa58
movzx r11d, byte [rcx + rdx]
movzx r12d, byte [rcx + r9]
xor r12d, r11d
inc rcx
or r10d, r12d
cmp rcx, r8
jl 0x58aa45
movzx edx, r10b
dec edx
nop
shr edx, 0x1f
lea r8, [rsi - 1]
and rdx, rdi
cmp rbx, r8
jbe 0x58aac9
movzx ecx, byte [rsi + rax - 1]
dec ecx
shr ecx, 0x1f
and rdx, rcx
mov ecx, 2
jmp 0x58aaa0
movzx esi, byte [rcx + rax]
not esi
movzx esi, sil
dec esi
shr esi, 0x1f
inc rcx
and rdx, rsi
nop dword [rax]
cmp rcx, r8
jl 0x58aa87
cmp rdx, 1
je 0x58aabf
mov rax, qword [0x0089a650]
mov rbx, qword [0x0089a658]
add rsp, 0x50
pop rbp
ret
xor eax, eax
xor ebx, ebx
add rsp, 0x50
pop rbp
ret
mov rax, r8
mov rcx, rbx
call fcn.004601e0
mov rax, rdx
mov rcx, r8
call fcn.004602a0
mov rax, rdi
mov rcx, r9
call fcn.004602a0
mov rdx, rcx
mov rcx, r9
call fcn.00460260
mov eax, 1
mov rcx, rax
nop dword [rax]
call fcn.004601e0
xor eax, eax
mov rcx, rax
call fcn.004601e0
mov rax, rbx
mov rcx, rdx
call fcn.00460200
lea rax, [0x0066d140]
lea rbx, [0x00740a70]
call fcn.004337c0
nop
mov qword [rsp + 8], rax
mov qword [rsp + 0x10], rbx
mov qword [rsp + 0x18], rcx
mov qword [rsp + 0x20], rdi
mov qword [rsp + 0x28], rsi
mov qword [rsp + 0x30], r8
mov qword [rsp + 0x38], r9
mov qword [rsp + 0x40], r10
call fcn.0045df00
mov rax, qword [rsp + 8]
mov rbx, qword [rsp + 0x10]
mov rcx, qword [rsp + 0x18]
mov rdi, qword [rsp + 0x20]
mov rsi, qword [rsp + 0x28]
mov r8, qword [rsp + 0x30]
mov r9, qword [rsp + 0x38]
mov r10, qword [rsp + 0x40]
jmp fcn.0058a680