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const BASE_64_MAP_INIT = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" 
dim newline 
dim Base64EncMap(63) 
dim Base64DecMap(127) 
'初始化函数 
PUBLIC SUB initCodecs() 
' 初始化变量 
newline = "<P>" & chr(13) & chr(10) 
dim max, idx 
max = len(BASE_64_MAP_INIT) 
for idx = 0 to max - 1 
Base64EncMap(idx) = mid(BASE_64_MAP_INIT, idx + 1, 1) 
next 
for idx = 0 to max - 1 
Base64DecMap(ASC(Base64EncMap(idx))) = idx 
next 
END SUB 

'SKCMS加密函数 
PUBLIC FUNCTION skcmscodeJ(plain) 
if len(plain) = 0 then 
skcmscodeJ = "" 
exit function 
end if 
dim ret, ndx, by3, first, second, third 
by3 = (len(plain) \ 3) * 3 
ndx = 1 
do while ndx <= by3 
first = asc(mid(plain, ndx+0, 1)) 
second = asc(mid(plain, ndx+1, 1)) 
third = asc(mid(plain, ndx+2, 1)) 
ret = ret & Base64EncMap( (first \ 4) AND 63 ) 
ret = ret & Base64EncMap( ((first * 16) AND 48) + ((second \ 16) AND 15 ) ) 
ret = ret & Base64EncMap( ((second * 4) AND 60) + ((third \ 64) AND 3 ) ) 
ret = ret & Base64EncMap( third AND 63) 
ndx = ndx + 3 
loop 
if by3 < len(plain) then 
first = asc(mid(plain, ndx+0, 1)) 
ret = ret & Base64EncMap( (first \ 4) AND 63 ) 
if (len(plain) MOD 3 ) = 2 then 
second = asc(mid(plain, ndx+1, 1)) 
ret = ret & Base64EncMap( ((first * 16) AND 48) + ((second \ 16) AND 15 ) ) 
ret = ret & Base64EncMap( ((second * 4) AND 60) ) 
else 
ret = ret & Base64EncMap( (first * 16) AND 48) 
ret = ret '& "=" 
end if 
ret = ret '& "=" 
end if 
skcmscodeJ = ret 
END FUNCTION 

'SKCMS解密函数 
PUBLIC FUNCTION skcmscodeD(scrambled) 
if len(scrambled) = 0 then 
skcmscodeD = "" 
exit function 
end if 
dim realLen 
realLen = len(scrambled) 
do while mid(scrambled, realLen, 1) = "=" 
realLen = realLen - 1 
loop 
dim ret, ndx, by4, first, second, third, fourth 
ret = "" 
by4 = (realLen \ 4) * 4 
ndx = 1 
do while ndx <= by4 
first = Base64DecMap(asc(mid(scrambled, ndx+0, 1))) 
second = Base64DecMap(asc(mid(scrambled, ndx+1, 1))) 
third = Base64DecMap(asc(mid(scrambled, ndx+2, 1))) 
fourth = Base64DecMap(asc(mid(scrambled, ndx+3, 1))) 
ret = ret & chr( ((first * 4) AND 255) + ((second \ 16) AND 3)) 
ret = ret & chr( ((second * 16) AND 255) + ((third \ 4) AND 15)) 
ret = ret & chr( ((third * 64) AND 255) + (fourth AND 63)) 
ndx = ndx + 4 
loop 
if ndx < realLen then 
first = Base64DecMap(asc(mid(scrambled, ndx+0, 1))) 
second = Base64DecMap(asc(mid(scrambled, ndx+1, 1))) 
ret = ret & chr( ((first * 4) AND 255) + ((second \ 16) AND 3)) 
if realLen MOD 4 = 3 then 
third = Base64DecMap(asc(mid(scrambled,ndx+2,1))) 
ret = ret & chr( ((second * 16) AND 255) + ((third \ 4) AND 15)) 
end if 
end if 
skcmscodeD=ret 
END FUNCTION 
call initCodecs 
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