[k3b] [Bug 360184] k3b should offer option to select either md5 sum or sha256 when loading dvd iso

[Phil via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=360184

--- Comment #4 from Phil <phdsrq at gmail.com> ---
Dear KDE "K3b" developers and maintainers, Leslie Zhai, Sebastian Trueg, 
Thomas Schmitt,

1. To all of you, Thank you for working on this great K3b application, and
making it even better.

2. It looks like you are using "QT" development for some if not all of this? I
do not yet know enough about "QT" to help with that. Although, the link from
Thomas regarding the use of "QCryptographicHash::Sha256" (and its variations)
look pretty good too me.

I don't know if this will help or not, but when I use Linux Mint for evaluating
checksum values, I can use the commands below. As far as I know, all Linux
distros (and maybe MS Windows too) have the command "sha256sum" already
installed.

To get the checksum value:
Example:
sha256sum -b linuxmint-18-kde-32bit.iso
Results in:
ff8bacc631e7955fc6b0f86c9014ce27aa455e3ee0913de0b2bc6c366b63c693
*linuxmint-18-kde-32bit.iso

To verify a checksum of a file with its downloaded checksum file
(sha256sum.txt) in the same folder, I can use either of these console terminal
commands:
Example:
sha256sum --check  sha256sum.txt
or 
sha256sum --check --ignore-missing sha256sum.txt

Results in:
linuxmint-18-cinnamon-32bit.iso: OK
linuxmint-18-kde-32bit.iso: OK
linuxmint-18-mate-32bit.iso: OK
linuxmint-18-xfce-32bit.iso: OK

3.) I tried to compile "K3b" from the link below using the "install.txt"
instructions, and could not successfully compile it on my Linux Mint KDE 32-bit
system.  Unfortunately, I only have an ancient 32- bit computer (11+ years old
Pentium 4 computer (single core)) which cannot install any version of QT higher
than "Qt v5.5" and 32-bit.  So, I still need alternate compiling instructions
(easy detailed ones please), or I would prefer easy to install ".deb" files, or
a PPA.

https://github.com/KDE/k3b

Best regards to all of you and yours,
Phil

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