data := "abc"
MsgBox % MD5(data,StrLen(data)) ; 900150983cd24fb0d6963f7d28e17f72

MD5( ByRef V, L=0 ) {
 VarSetCapacity( MD5_CTX,104,0 ), DllCall( "advapi32\MD5Init", Str,MD5_CTX )
 DllCall( "advapi32\MD5Update", Str,MD5_CTX, Str,V, UInt,L ? L : VarSetCapacity(V) )
 DllCall( "advapi32\MD5Final", Str,MD5_CTX )
 Loop % StrLen( Hex:="123456789ABCDEF0" )
  N := NumGet( MD5_CTX,87+A_Index,"Char"), MD5 .= SubStr(Hex,N>>4,1) . SubStr(Hex,N&15,1)
Return MD5
}