Dmg Vs Pgp Signature Program

How to verify your download with PGP/ASC signatures and MD5, SHA256 hash values?

A hash valueprocessed on the downloaded file is a way to make sure that the content is transferred OK and has not been damaged duringthe download process.

Note:
There is no need to do all the verifications. The best is to check the PGP signature (.asc) file. Failing that, use theSHA256 hash, otherwise use the MD5 hash.

Verify in the Internet

Internet - Verify with SHA256 and MD5

Online services in the Internet allows to verify downloaded files. It is not necessary to upload anything. The files will be checked locally in the browser. Therefore it is also very useful if you have a slow Internet connection. HTML5 support is needed to use most of these services. However, nowadays every browser should have this support built-in. Here are a few and not to prefer a specific tool:
HTML5 File Hash Online Calculator
The service is easy to use. Just drag & drop the respective file to the drop zone in the webpage and the hash calculation is starting automatically. Or click into the drop zone to select the file via a file open dialog.
OnlineMD5
The service is easy to use. Just drag & drop the respective file to the drop zone in the webpage or open the file dialog. Then choose SHA256 or MD5 as checksum type, insert the checksum from the file you got from download webpage. Finally click on [Compare] to start the verification.
If both hash values do not match, please see the section below.

Verify on Windows

How to verify with PGP/ASC signatures

There are a few tools available like 'Gpg4win', 'GnuPG' just to name a few and not to prefer a specific tool. For the following instructions 'GnuPG' will be used as an example an example to show for your convenience how the verification is working.
For verifying signatures you need the software 'GnuPg'. This is a tool that runs not in the graphical mode but in the command prompt of Windows. Therefore you have to enter always the full path (default location after installation: C:Program FilesGnuGnuPggpg.exe) until you add it to the $PATH system environment variable.
Save the following file with your Internet browser to the location where the downloaded AOO and PGP/ASC file is stored:
Open the start menu and enter cmd.exe into the search box.
Now change to the directory with the downloaded AOO, KEYS and PGP/ASC file, import and verify with the following commands:
If the signature matches the file it is indicated with an 'Good signature from <Person who has created the signature> statement.
Otherwise with 'BAD signature from ...'.

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How to verify SHA256 / MD5 hash values

There are several tools available like 'HashTab', 'MD5sums', 'FSUM', 'Quick Hash GUI', 'SHA256 Checksum Utility', 'File Checksum Tool' just to name a few and not to prefer a specific tool. For the following instructions 'File Checksum Tool' will be used as an example to show for your convenience how the verification is working.
Start the tool from where you have saved the downloaded file.
Section '1) File to Verify': Insert the path and filename of the downloaded AOO file. The [Browse] button will help to locate it with the Windows Explorer.
Section '2) Hashing Algorithm': Choose 'SHA-256' or 'MD5'.
Section '3) File Checksum': Click on [Calculate Hash].
Section '4) Verify With': Paste the hash from the SHA256 / MD5 file you have downloaded. First you have to open it and copy the hash value.
Finally, click on [Compare].
When both hash values match a dialogbox shows 'Checksums match'. Otherwise 'Checksums do not match'.
If they do not match, please see the section below.

Verify on Linux

How to verify with PGP/ASC signatures

Open a terminal and change to the directory with the downloaded AOO and PGP/ASC file.
Type in the following commands:
If the signature matches the file it is indicated with an 'Good signature from <Person who has created the signature> statement.
Otherwise with 'BAD signature from ...'.

How to verify SHA256 / MD5 hash values

The instructions to compare SHA256 and MD5 hash values are very similar. Therefore both are mentioned together.
Open a terminal and change to the directory with the downloaded AOO and SHA256 / MD5 file.
Type in the following commands:
or
If the hash matches this is indicated by '<AOO file>.tar.gz: OK'.
Otherwise 'WARNING: 1 of 1 computed checksum did NOT match'.
If they do not match, please see the section below.

Verify on Mac OS

How to verify with PGP/ASC signatures

A requirement is that you have installed GnuPG.
Open a terminal (usually from here: '/Applications/Utilities') and change to the directory with the downloaded AOO and PGP/ASC file.
Type in the following commands:
If the signature matches the file it is indicated with an 'Good signature from <Person who has created the signature> statement.
Otherwise with 'BAD signature from ...'.

How to verify SHA256 / MD5 hash values

The instructions to compare SHA256 and MD5 hash values are very similar. Therefore both are mentioned together.
Open a terminal (usually from here: '/Applications/Utilities').
Type in the following commands:
or
Now compare the hash generated by OpenSSL with the value in the file.
If they do not match, please see the section below.

What to do when the values do not match?

If the values do not match, your downloaded AOO file is broken. Please try the download again, and recheck.
If the check still fails, try another browser if possible. If you are using a proxy server to get connected to the Internet try to disable this if your Internet Service Provider is allowing this. Or enable it if it is disabled at the moment. Please consult the relevant help topics for the used Internet browser where to find this setting. Finally try to download again, and recheck.
If you still get no matching values and you are sure it is not caused by an error during downloading, please notify the Apache OpenOffice project. Before doing this, make sure you have the following information at hand:
1) The exact file name of the downloaded installation file.
2) The value of the downloaded signature/hash file.
3) The processed signature/hash from your computer.
4) The exact size of the installation file in byte.
5) Have you used a proxy server (yes/no)?
6) The exact URL from the server from where the files was downloaded.
With this information send a mail via the following ways:
User's mailing list*)

*) Please note that all mails go to a public mailing list, not an individual person. Mails will be archived and can be accessed also by other users. To receive answers, you will need to subscribe to the mailing