• I write some test codes.

    var strChr = String.fromCharCode;
    
    var msg = "1234567890";
    
    for(var lp=0; lp<8;lp++){
      // mask
      var mask = [];
      var masked1 = '';
      for (var ix = 0; ix < 4; ix++){
        var rnd = Math.floor( Math.random() * 255 );
        mask[ix] = rnd;
        masked1 += strChr(rnd);
      }
    
      // masked1:
      for (var ix = 0; ix < msg.length; ix++){
        masked1 += strChr(msg.charCodeAt(ix) ^ mask[ix & 3]);
      }
      // masked1 char code
      var masked1code = [];
      for(var i = 0;i<masked1.length; i++){
        masked1code[i] = masked1.charCodeAt(i);
      }
    
    
      // masked2
      var masked2 = new Uint32Array(1+((msg.length+3)>>2));
      var m8 = new Uint8Array(masked2.buffer, 0, (4 + msg.length));
      m8.set(mask,0);
      m8.set(msg,4);
      var m = masked2[0];
      for (var i=1;i<masked2.length;i++) {
        masked2[i]^=m;
      }
      console.log("----------------------lp(" + lp + ")--------------------");
      console.log(mask);
      console.log(masked1code);
      console.log(masked2);
      console.log(m8);
    }
    
    

    result:

    >----------------------lp(0)------------­--------
    [ 244, 247, 131, 224 ]
    [ 244, 247, 131, 224, 197, 197, 176, 212, 193, 193, 180, 216, 205, 199 ]
    new Uint32Array([3766745076, 3568354757, 3635724737, 3766732749])
    new Uint8Array([244, 247, 131, 224, 197, 197, 176, 212, 193, 193, 180, 216, 205, 199])
    ----------------------lp(1)-------------­-------
    [ 203, 75, 141, 225 ]
    [ 203, 75, 141, 225, 250, 121, 190, 213, 254, 125, 186, 217, 242, 123 ]
    new Uint32Array([3784133579, 3586030074, 3652877822, 3784145906])
    new Uint8Array([203, 75, 141, 225, 250, 121, 190, 213, 254, 125, 186, 217, 242, 123])
    ----------------------lp(2)-------------­-------
    [ 172, 35, 218, 166 ]
    [ 172, 35, 218, 166, 157, 17, 233, 146, 153, 21, 237, 158, 149, 19 ]
    new Uint32Array([2799313836, 2464747933, 2666337689, 2799309717])
    new Uint8Array([172, 35, 218, 166, 157, 17, 233, 146, 153, 21, 237, 158, 149, 19])
    ----------------------lp(3)-------------­-------
    [ 231, 205, 151, 99 ]
    [ 231, 205, 151, 99, 214, 255, 164, 87, 210, 251, 160, 91, 222, 253 ]
    new Uint32Array([1670893031, 1470431190, 1537276882, 1670905310])
    new Uint8Array([231, 205, 151, 99, 214, 255, 164, 87, 210, 251, 160, 91, 222, 253])
    ----------------------lp(4)-------------­-------
    [ 121, 220, 55, 245 ]
    [ 121, 220, 55, 245, 72, 238, 4, 193, 76, 234, 0, 205, 64, 236 ]
    new Uint32Array([4114078841, 3238325832, 3439389260, 4114082880])
    new Uint8Array([121, 220, 55, 245, 72, 238, 4, 193, 76, 234, 0, 205, 64, 236])
    ----------------------lp(5)-------------­-------
    [ 165, 47, 134, 99 ]
    [ 165, 47, 134, 99, 148, 29, 181, 87, 144, 25, 177, 91, 156, 31 ]
    new Uint32Array([1669738405, 1471487380, 1538333072, 1669734300])
    new Uint8Array([165, 47, 134, 99, 148, 29, 181, 87, 144, 25, 177, 91, 156, 31])
    ----------------------lp(6)-------------­-------
    [ 9, 142, 128, 143 ]
    [ 9, 142, 128, 143, 56, 188, 179, 187, 60, 184, 183, 183, 48, 190 ]
    new Uint32Array([2407566857, 3149118520, 3082270780, 2407579184])
    new Uint8Array([9, 142, 128, 143, 56, 188, 179, 187, 60, 184, 183, 183, 48, 190])
    ----------------------lp(7)-------------­-------
    [ 217, 225, 170, 12 ]
    [ 217, 225, 170, 12, 232, 211, 153, 56, 236, 215, 157, 52, 224, 209 ]
    new Uint32Array([212525529, 949605352, 882759660, 212521440])
    new Uint8Array([217, 225, 170, 12, 232, 211, 153, 56, 236, 215, 157, 52, 224, 209])
    =undefined
    

    It seems that your codes works well.

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