And yes, editing a file inside the.zip will most likely change the MD5 of the.zip file - even though that's not guaranteed, due to hash collisions. But that's just a general property of hashes and has nothing to do with the zipping. Note, however, that rezipping files may change the MD5 hash, even if. Nov 05, 2018 @ Dec. The checksum file generation function of the latest-available WinCryptHashers v1.2 x64 (30 Dec 2017) is not working with 7-zip v18.05 x64 (30 Apr 2018). After the target files/folders are sent to '7-zip Add to Archive' (right-click menu), there are no checksum formats (eg.md5,.sfv, etc.) listed within the 'Archive Format' dropdown menu in 7-zip's dialog window.
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Active4 years, 2 months ago
Is it possible to generate MD5 hash for
.zip files in java? All the examples I found were for .txt files.
I want to know when we unzip the data, edit a file, again zip it and find the hash, will it be different from the original one?
mastov
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PriyaPriya
1 Answer
You can create MD5 hashes for any arbitrary file, independently of the file type. The hash just takes any byte stream and doesn't interpret its meaning at all. So you can use the examples you have found for .txt files and apply them to .zip files.
And yes, editing a file inside the .zip will most likely change the MD5 of the .zip file - even though that's not guaranteed, due to hash collisions. But that's just a general property of hashes and has nothing to do with the zipping.
Note, however, that rezipping files may change the MD5 hash, even if the content has not changed. That's because even though the unzipped files are the same as before, the zipped file may vary depending on the used compression algorithm and its parameters.
EDIT (based on your comment):
If you want to avoid those changing MD5 hashes on rezipping, you have to run the MD5 on the unzipped files. You can do that on-the-fly without actually writing the files to disk, just by using streams. mastovmastov
ZipInputStream helps you. A simple code example:
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This tiny freeware utility checks the validity of downloaded files by quickly comparing the files to previously generated checksums, though it can't check complete folders. With MD5 Checker's ultrasimple interface, you can easily browse for files to validate, or generate MD5 checksums. Using the program is merely a matter of pointing the program to the file of your download. The program rapidly computes the checksum of a file and quickly compares that value to the expected checksum. The program clearly indicates checksum values as matched or mismatched. However, MD5 Checker works only with files and can't check a folder of files with a single click. Even so, software developers who download from services that include checksum files will want this freeware application in their toolboxes.
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This tiny freeware utility checks the validity of downloaded files by quickly comparing the files to previously generated checksums, though it can't check complete folders. With MD5 Checker's ultrasimple interface, you can easily browse for files to validate, or generate MD5 checksums. Using the program is merely a matter of pointing the program to the file of your download. The program rapidly computes the checksum of a file and quickly compares that value to the expected checksum. The program clearly indicates checksum values as matched or mismatched. However, MD5 Checker works only with files and can't check a folder of files with a single click. Even so, software developers who download from services that include checksum files will want this freeware application in their toolboxes.
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