Unfamiliar characters used in JavaScript encryption script
encryption, javascript
Solution
Left shift 8 bits and bitwise OR with j.
`<<` is the left shift operator. Shifts the bits in the variable left the number of positions indicated.
`>>` is the right shift operator. Shifts the bits in the variable right the number of position indicated.
`|` is the bitwise OR operator. Performs a logical OR on each bit in the two operands.
`&` is the bitwise AND operator. Performs a logical AND on each bit in the two operands.
Problem
Here is an excerpt from a JS encryption script that I am studying. ``` function permutationGenerator(nNumElements) { this.nNumElements = nNumElements; this.antranspositions = new Array; var k = 0; for (i = 0; i < nNumElements - 1; i++) for (j = i + 1; j < nNumElements; j++) this.antranspositions[ k++ ] = ( i << 8 ) | j; // keep two positions as lo and hi byte! this.nNumtranspositions = k; this.fromCycle = permutationGenerator_fromCycle; } ``` Can anyone explain the use of the double less than signs <<, as well as the single pipe | ? Later in the script double greater than signs occur as well >>, also single ampersand & . ``` function permutationGenerator_fromCycle(anCycle) { var anpermutation = new Array(this.nNumElements); for (var i = 0; i < this.nNumElements; i++) anpermutation[i] = i; for (var i = 0; i < anCycle.length; i++) { var nT = this.antranspositions[anCycle[i]]; var n1 = nT & 255; var n2 = (nT >> 8) & 255; // JC nT = anpermutation[n1]; anpermutation[n1] = anpermutation[n2]; anpermutation[n2] = nT; } return anpermutation; } ``` I am familiar with single < or > and of course logical && and logical || . Thoughts?