Dmg.sha256 How To Terminal

05.03.2019

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SHA2 checksum for Sierra's InstallESD.dmg? Ask Question Asked 3 years, 4 months ago. Active 3 years, 4 months ago. Viewed 5k times 1. Before making a bootable drive for Sierra's installer i want to make sure that the download was successful. Install macOS High Sierra using Terminal. Install macOS High Sierra.app does not appear to be a. On Linux use the sha256sum or md5sum command line utilities to verify the integrity of the downloaded file. On OS X use the shasum -a 256 or md5 command line utilities to verify the integrity of the downloaded file.

Malware is becoming more and more common for macOS. I wanted to make sure file I downloaded files such as an ISO image or firmware are safe before install on my system. How do I verify md5 or sha1 or sha256 checksums for my Apple MacOS X when I download files from the Internet?
Matching the checksum of a download file is necessary and useful in some cases. The main reason is to make sure that one can validate the transmission was ok. The downloaded file was not corrupted or modified during the transfer. You need to use the shasum command to compute or verify SHA message digests.
A checksum is nothing but a digit representing the sum of the correct digits in a piece of stored or transmitted digital data, against which later comparisons can be made to detect errors in the data.

Syntax to check and verify md5/sha1/sha256 checksums for MacOS X

To print or check SHA checksums use the following syntax:
shasum -a algorithm filename shasum -a algorithm -c input.txt
Where,

-a algorithm : It can be 1 (default), 224, 256, 384, and 512.
-c input.txt : Check SHA sums against given list usually stored in a text file.

Examples

Open the Terminal application and grab the latest firmware using wget command:
$ wget http://www.mediafire.com/file/ff04qcobujqek27/RT-AC87U_380.66_6.zip
Verify the file:
$ ls -lh RT-AC87U_380.66_6.zip
Unzip the file using unzip command:
$ unzip RT-AC87U_380.66_6.zip
Sample outputs:

Your firmware file named RT-AC87U_380.66_6.trx. You can verify its integrity with sha256sum.sha256 file as follows:
$ shasum -a 256 -c sha256sum.sha256
Sample outputs:

If file is modified during transmission or by malware on the remote server you will get an error that read as follows:
$ shasum -a 256 -c sha256sum.sha256
Sample outputs:

You must delete the file immediately using the rm command:
$ rm RT-AC87U_380.66_6.zip RT-AC87U_380.66_6.trx
To calculate SHA-256 checksum for an iso file named foo.iso, run:
$ shasum -a 256 foo.iso

Verifying an SHA-1 checksum

The syntax is:
$ shasum -a 1 -c input.txt
OR
$ shasum -a 1 filename
OR
$ shasum -a 1 centos.iso
To see more info about the shasum command type:
$ shasum --help
Sample outputs:

Another option: openssl command

You can use the openssl command as follows to get and verify checksum.

Verifying an SHA-1 checksum with the openssl command

$ openssl sha1 filename $ openssl sha1 ~/isoimages/unetbootin-mac-625.dmg SHA1(/Users/veryv/isoimages/unetbootin-mac-625.dmg)= 8a44b5095ed9b05f8a2643a5df91e932467a0e7

Verifying an SHA256 checksum with the openssl command

$ openssl dgst -sha256 filename $ openssl dgst -sha256 ~/isoimages/CentOS-7-x86_64-Minimal-1611.iso SHA256(/Users/veryv/isoimages/CentOS-7-x86_64-Minimal-1611.iso)= 27bd866242ee058b7a5754e83d8ee8403e216b93d130d800852a96f41c34d86a

Verifying an MD5 checksum with the openssl command

$ openssl md5 filename $ openssl md5 /etc/passwd MD5(/etc/passwd)= 5e7f80888f3d491c4963881364048c24