sha1=sha1file(file,blocks-to-read,block-length)
crc=crcfile(file,blocks-to-read,block-length)

sha1=sha1string(string)
crc=crcstring(string)

envdir=DIRECTORY()"\FingerPrint"
rc=0
SAY FUNCDEF('SHA1File','str,str,32,32',envdir,'SHA1FILE')
SAY FUNCDEF('CRCFile','32u,str,32,32',envdir,'CRCFILE')
SAY FUNCDEF('SHA1String','str,str,32',envdir,'SHA1STRING')
SAY FUNCDEF('CRCString','32u,str,32',envdir,'CRCSTRING')

regdir=VALUE('HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\App Paths\RxLaunch.exe\Path', ,"WIN32")
file=regdir"RXLaunch.exe"
SAY "Reginald Directory: "regdir
SAY "Fingerprint of    : "file 
SAY "SHA1: "sha1file(file,256,100)
SAY "CRC : "crcfile(file,256,100)

SAY "Fingerprint of  strings" 
SAY "SHA1: "sha1string("The quick brown fox jumps over the lazy dog")
SAY "SHA1: "sha1string("The quick brown fox jumps over the lazy cog")

SAY "CRC : "crcstring("The quick brown fox jumps over the lazy dog")
SAY "CRC : "crcstring("The quick brown fox jumps over the lazy cog")

FingerPrint.zip

At various times, Beyond Compare performs a content comparison on a pair of files to determine if they match.

Content comparison methods

CRC comparison compares CRC values.  A CRC (Cyclic Redundancy Check) is a numeric representation of the contents of a file.  If the CRCs of two files are different, then the contents of those files must be different.  If the CRCs match, then it is likely (but not absolutely certain) that the contents match.  When comparing two versions of the same data, you can be reasonably confident that they are exactly the same if their CRCs match.

Binary comparison compares files byte-by-byte.

Rules-based comparison compares files based on their file format associations.  It allows you to define unimportant differences, such as changes in whitespace or source code comments.  A rules-based comparison can also ignore differences in file encoding or line endings.