CypherCalc's Bit Shifter can be used to evaluate and simulate a variety of shift register configurations.

All 32-bits of the Bit Shifter are initialized to zero. Also, note that the hex value of the entire 32-bit shift register is displayed in a box at the top of the Bit Shifter, along with each 16-bit word, and each 8-bit byte.

The Bit Shifter can perform four types of shift:

• Rotate: The bits shift in a circular manner. For a left shift, the MSB wraps around to the LSB. For a right shift, the LSB wraps around to the MSB.
• Arithmetic Shift: For a right shift, the MSB is treated as a sign bit and will be reset to its current value on each shift. LSBs are lost as they shift out of the register. For a left shift, the LSBs are replaced with zeroes on each shift, and the MSBs are lost as they shift out of the register.
• Logical Shift: For a right shift, the MSBs are filled with zeroes and LSBs are lost as they shift out of the register. For a left shift,  the LSBs are filled with zeroes and MSBs are lost as they shift out of the register.
• Feedback: In this mode, you can select a combination of the 32 bits to be fed back (via an exclusive-OR) to the LSB. Only left shifting is allowed in feedback mode. You select a bit for feedback by checking the box just below the desired bit.

A shift register bit can be toggled at any time by clicking on the bit. You can also preset the entire shift register by loading the desired hex value into the "Pre-load" box and clicking "Load".

Clicking "Clear Shifter" will reset all shifter bits to zero.

Any time the state of the Shift Register changes, the new 32-bit value is logged in the "History" box. You can copy values from this box and paste them into other CypherCalc windows, or other applications.

Clicking the "Clear History" button will erase the current contents of the "History" box.