vb版rc4算法
public sub main()
dim key as string
for i = 1 to 16
randomize
key = key & chr(rnd * 255)
next i
msgbox rc4(rc4("welcome to plindge studio!", key), key)
end sub
public function rc4(inp as string, key as string) as string
dim s(0 to 255) as byte, k(0 to 255) as byte, i as long
dim j as long, temp as byte, y as byte, t as long, x as long
dim outp as string
for i = 0 to 255
s(i) = i
next
j = 1
for i = 0 to 255
if j > len(key) then j = 1
k(i) = asc(mid(key, j, 1))
j = j + 1
next i
j = 0
for i = 0 to 255
j = (j + s(i) + k(i)) mod 256
temp = s(i)
s(i) = s(j)
s(j) = temp
next i
i = 0
j = 0
for x = 1 to len(inp)
i = (i + 1) mod 256
j = (j + s(i)) mod 256
temp = s(i)
s(i) = s(j)
s(j) = temp
t = (s(i) + (s(j) mod 256)) mod 256
y = s(t)
outp = outp & chr(asc(mid(inp, x, 1)) xor y)
next
rc4 = outp
end function
