The Check Sum tool can be used to apply a number of Check Sum or Hash Algorithms to the current file. Run the Check Sum tool by clicking the 'Tools > Check Sum...' menu option.

Select which Check Sum algorithms to perform on the file by checking or unchecking the algorithm name in the Algorithms list. Note that all algorithms can be selected or deselected at once by clicking the box beside the Algorithms label. The following algorithms are supported:

• Checksum-8
• Checksum-16
• Checksum-32
• Checksum-64
• CRC-16
• CRC-16/CCITT
• CRC-32
• Adler32
• MD2
• MD4
• MD5
• RIPEMD160
• SHA-1
• SHA-256
• TIGER

The Checksum-8 through Checksum-64 algorithms calculate the sum of all bytes in the current file. The 8, 16, 32, and 64 refer to how many bits are displayed in the output. The details of the other algorithms are beyond the scope of this help file.

If no bytes are selected in the file when the Check Sum tool is run, the algorithms will be applied to all bytes in the file. When a selection is made, select the Selection toggle in the dialog box to apply the algorithms to only the selected bytes (the default), or the Entire File toggle to apply the algorithms to all bytes.

Besides limiting the checksum to the selected bytes, explicitly excluding certain byte ranges is possible by enabling the Ignore Byte Ranges toggle and entered ranges in the associated field. Multiple addresses can be indicated using commas, and a range of addresses can be indicated using '..' between two addresses (the range is inclusive). Any of the standard numeric formats can be used in the field. For example, entering the ranges '512..515,0x1000' would ignore the 4 bytes starting at position 512, and the single byte at 0x1000. This feature is useful to calculate the checksums for files where the actual checksum is stored in the file and thus should be excluded from the calculation.

Click the OK button to perform the calculation or click the Cancel button to dismiss the dialog.

Output Window

The results of the different algorithms are displayed in the Output Window. The algorithm name is listed under the Algorithm column and the result is displayed in the Check Sum/Digest column. The result can be copied to the clipboard by right-clicking the Output Window and selecting 'Copy'. Select 'Clear' from the right-click menu to clear all of the results. Press the Esc key in the Output Window to hide the window.