function BigInteger(a,b,c) {
      if(a != null)
        if("number" == typeof a) this.fromNumber(a,b,c);
        else if(b == null && "string" != typeof a) this.fromString(a,256);
        else this.fromString(a,b);
    }
Converts a byte string representation to an array of unsigned
8-bit integers.

@function
@param vector {array}
    Array containing the byte values.
@returns {string}
    Byte string representation of vector.