Check tutorial of Check SHA1 Checksum in Mac OS X
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SHA hashing is commonly used with distribution control systems to determine revisions and to check data integrity by detecting file corruption or tampering. For general use, a SHA checksum provides a string of characters that can be used to verify that a file was transferred as intended. If SHA checksums match, the integrity of the files is preserved.
This tutorial Will show you how to check the sha1 checksum of a file on Mac, but it works the same under Linux too.
How to Check SHA1 hash of a file in Mac OS X
Launch the Terminal, located in the Applications and Utilities folder, and use the following syntax:
shasum / path / to / file
To verify a file called “DownloadedFile.dmg” on the desktop, this would be:
shasum ~ / Desktop / DownloadedFile.dmg
This will yield something like:
$ shasum ~ / Desktop / CheckMe.zipddfdb3a7fc6fc7ca714c9e2930fa685136e90448 CheckMe.zip
That long hex string is the SHA1 hash.
It might look something like this in a Terminal window:
An easy way to check SHA1 files buried deep in the file system without typing the full path is to type in the first part of the command and then drag and drop the file to the Terminal window . This will automatically type the path for you:
shasum (drag and drop file here)
Don’t forget to put a space after “shasum” for this to work properly.
The default setting for the shasum command is to use SHA1, the most common hash type, but this can be changed with the -a flag to 224, 256, 384, or 512 if needed. Also, although SHA1 is becoming more common than MD5, you can also easily check md5 hash in Mac OS X with md5 command.
Examples of using SHA1 to verify files
So you might be wondering, when could you use this to verify the integrity of a file?
One practical use that Mac users may come across is to download software updates direct from Apple, which lists the SHA1 hash of each file served through their servers at the end of each download page. You can see such a string highlighted in the screenshot below. With this sha string, users can easily verify the integrity of their downloads, whether from Apple or when the file is hosted on a third party mirror site.
This is also how Mac OS X 10.7.3 was discovered to have been quietly updated, and several questions about it spawned this particular post.
Using SHA1 hash strings is also an easy way to verify file transfers from peer-to-peer networks and to make sure a download has completed or a file hasn’t been tampered with anywhere along the line . By knowing the original SHA1 checksum, you can verify that your version of the file (s) match and determine if the file is indeed valid and arrived as intended.
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