As a DBA, in your time, you will need to download files such as Oracle binaries, patches, etc.  As a rule of thumb, you should always checksum your downloads, to ensure they are free of corruption.  In my example, I needed to download:
Patch 25440397: QUARTERLY FULL STACK DOWNLOAD PATCH FOR EXADATA (Apr 2017 – 12.1.0.2)

This is the Quarterly Full Stack Download Patch for Exadata, which is 10 zip files that total 13Gb.  That’s a lot of bytes and although highly unlikely, it’s possible for one of them to become corrupt.  Therefore, to avoid downstream pain, check the downloads’ md5 checksum on your machine.  The Microsoft File Checksum Integrity Verifier (FCIV), can be found here:
How to compute the MD5 or SHA-1 cryptographic hash values for a file

Below shows the downloads’ MD5 checksum using FCIV:

Microsoft Windows [Version 10.0.14393]
(c) 2016 Microsoft Corporation. All rights reserved.

C:\Users\anwarz>C:\Users\anwarz\Downloads\md5\fciv.exe "C:\Users\anwarz\Exadata Patching 2017\p25440397_121020_Linux-x86-64_1of10.zip"
//
// File Checksum Integrity Verifier version 2.05.
//
855c3d128adb7f87eee04d7615f20e2b c:\users\anwarz\exadata patching 2017\p25440397_121020_linux-x86-64_1of10.zip

C:\Users\anwarz>C:\Users\anwarz\Downloads\md5\fciv.exe "C:\Users\anwarz\Exadata Patching 2017\p25440397_121020_Linux-x86-64_2of10.zip"
//
// File Checksum Integrity Verifier version 2.05.
//
93cea0dddd371e148f6cb3e35f9faa6a c:\users\anwarz\exadata patching 2017\p25440397_121020_linux-x86-64_2of10.zip

C:\Users\anwarz>C:\Users\anwarz\Downloads\md5\fciv.exe "C:\Users\anwarz\Exadata Patching 2017\p25440397_121020_Linux-x86-64_3of10.zip"
//
// File Checksum Integrity Verifier version 2.05.
//
22318acb7fa36154f0bb6d02115daba4 c:\users\anwarz\exadata patching 2017\p25440397_121020_linux-x86-64_3of10.zip

C:\Users\anwarz>C:\Users\anwarz\Downloads\md5\fciv.exe "C:\Users\anwarz\Exadata Patching 2017\p25440397_121020_Linux-x86-64_4of10.zip"
//
// File Checksum Integrity Verifier version 2.05.
//
28957a7ac3f2b05625cf3058fc97d981 c:\users\anwarz\exadata patching 2017\p25440397_121020_linux-x86-64_4of10.zip

C:\Users\anwarz>C:\Users\anwarz\Downloads\md5\fciv.exe "C:\Users\anwarz\Exadata Patching 2017\p25440397_121020_Linux-x86-64_5of10.zip"
//
// File Checksum Integrity Verifier version 2.05.
//
a1cdad9db470bb10eb14d85c3240fa64 c:\users\anwarz\exadata patching 2017\p25440397_121020_linux-x86-64_5of10.zip

C:\Users\anwarz>C:\Users\anwarz\Downloads\md5\fciv.exe "C:\Users\anwarz\Exadata Patching 2017\p25440397_121020_Linux-x86-64_6of10.zip"
//
// File Checksum Integrity Verifier version 2.05.
//
f358ebbf9e2fc222795176091939054c c:\users\anwarz\exadata patching 2017\p25440397_121020_linux-x86-64_6of10.zip

C:\Users\anwarz>C:\Users\anwarz\Downloads\md5\fciv.exe "C:\Users\anwarz\Exadata Patching 2017\p25440397_121020_Linux-x86-64_7of10.zip"
//
// File Checksum Integrity Verifier version 2.05.
//
3d20be91084b10fcb6fe3aa045346bf1 c:\users\anwarz\exadata patching 2017\p25440397_121020_linux-x86-64_7of10.zip

C:\Users\anwarz>C:\Users\anwarz\Downloads\md5\fciv.exe "C:\Users\anwarz\Exadata Patching 2017\p25440397_121020_Linux-x86-64_8of10.zip"
//
// File Checksum Integrity Verifier version 2.05.
//
7cebaca222e384957b8e65df0de6e6b1 c:\users\anwarz\exadata patching 2017\p25440397_121020_linux-x86-64_8of10.zip

C:\Users\anwarz>C:\Users\anwarz\Downloads\md5\fciv.exe "C:\Users\anwarz\Exadata Patching 2017\p25440397_121020_Linux-x86-64_9of10.zip"
//
// File Checksum Integrity Verifier version 2.05.
//
5a79f025564427a14ab7adce31d1a8bb c:\users\anwarz\exadata patching 2017\p25440397_121020_linux-x86-64_9of10.zip

C:\Users\anwarz>C:\Users\anwarz\Downloads\md5\fciv.exe "C:\Users\anwarz\Exadata Patching 2017\p25440397_121020_Linux-x86-64_10of10.zip"
//
// File Checksum Integrity Verifier version 2.05.
//
34b8bfe3792fa9dbd0cd13ba61bc5696 c:\users\anwarz\exadata patching 2017\p25440397_121020_linux-x86-64_10of10.zip

C:\Users\anwarz>

The MD5 checksums then can be verified with what Oracle Support list under the patch, click ‘Download’, then ‘View Digest Details’:

Once checked on your machine and then you transfer to server (assuming you didn’t download directly to server using WGET or something), then check again using md5sum:

[oracle@v1oex1dbadm01 25440397]$ md5sum p25440397_121020_linux-x86-64_1of10.zip
 855c3d128adb7f87eee04d7615f20e2b p25440397_121020_linux-x86-64_1of10.zip
[oracle@v1oex1dbadm01 25440397]$ md5sum p25440397_121020_linux-x86-64_2of10.zip
93cea0dddd371e148f6cb3e35f9faa6a p25440397_121020_linux-x86-64_2of10.zip
[oracle@v1oex1dbadm01 25440397]$ md5sum p25440397_121020_linux-x86-64_3of10.zip
22318acb7fa36154f0bb6d02115daba4 p25440397_121020_linux-x86-64_3of10.zip
[oracle@v1oex1dbadm01 25440397]$ md5sum p25440397_121020_linux-x86-64_4of10.zip
28957a7ac3f2b05625cf3058fc97d981 p25440397_121020_linux-x86-64_4of10.zip
[oracle@v1oex1dbadm01 25440397]$ md5sum p25440397_121020_linux-x86-64_5of10.zip
a1cdad9db470bb10eb14d85c3240fa64 p25440397_121020_linux-x86-64_5of10.zip
[oracle@v1oex1dbadm01 25440397]$ md5sum p25440397_121020_linux-x86-64_6of10.zip
f358ebbf9e2fc222795176091939054c p25440397_121020_linux-x86-64_6of10.zip
[oracle@v1oex1dbadm01 25440397]$ md5sum p25440397_121020_linux-x86-64_7of10.zip
3d20be91084b10fcb6fe3aa045346bf1 p25440397_121020_linux-x86-64_7of10.zip
[oracle@v1oex1dbadm01 25440397]$ md5sum p25440397_121020_linux-x86-64_8of10.zip
7cebaca222e384957b8e65df0de6e6b1 p25440397_121020_linux-x86-64_8of10.zip
[oracle@v1oex1dbadm01 25440397]$ md5sum p25440397_121020_linux-x86-64_9of10.zip
5a79f025564427a14ab7adce31d1a8bb p25440397_121020_linux-x86-64_9of10.zip
[oracle@v1oex1dbadm01 25440397]$ md5sum p25440397_121020_linux-x86-64_10of10.zip
34b8bfe3792fa9dbd0cd13ba61bc5696 p25440397_121020_linux-x86-64_10of10.zip
[oracle@v1oex1dbadm01 25440397]$

Once all checked, you’re free to unzip, knowing you’re free from corruption 🙂

Mind you, that doesn’t guarantee you wouldn’t get corruption from I/O but that would be extremely unlucky and you’ll have bigger problems.

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Thanks

Zed DBA (Zahid Anwar)