private static BigInteger bigForString ( String str , int sigchars ) { assert str . length ( ) <= sigchars ; BigInteger big = BigInteger . ZERO ; for ( int i = 0 ; i < str . length ( ) ; i ++ ) { int charpos = 16 * ( sigchars - ( i + 1 ) ) ; BigInteger charbig = BigInteger . valueOf ( str . charAt ( i ) & 0xFFFF ) ; big = big . or ( charbig . shiftLeft ( charpos ) ) ; } return big ; }
Copies the characters of the given string into a BigInteger .