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0
votes
1answer
51 views

How to transparently substitute sha1sum for shasum in sh shell?

I have a test that needs to run on multiple platforms. On all other platforms, the test uses sha1sum, but on my Mac OSX El Capitan, there is no such program installed, but shasum works fine as a ...
4
votes
1answer
97 views

Different SHA1 result every time I check, bad drive?

I was attempting to download and run the Windows 10 Insider Preview, but after a few failed boots and installation errors, I decided to test the SHA1 sum before committing. I noticed that every time ...
31
votes
8answers
8k views

Can a file be maliciously changed in a way that maintains its original SHA-1 Hash?

According to this article, and many others, SHA-1 is not secure. In my case, I am not concerned about passwords or digital certificates. I am concerned about file integrity. Is it reasonably ...
1
vote
1answer
943 views

How to get sha1sum to work on Mac OS X?

I have an application that I'm porting and as part of the test suite, I run sha1sum. I'd like to have test code that works on all my platforms and not vary across platforms. Mac OS X, is the first ...
0
votes
1answer
266 views

Checksums don't match is that bad?

I recently started looking at VisualStudio 2012. I tried downloading it from the official Microsoft link but it failed with some errors. As of some suggestions I downloaded the DVD5 ISO image to ...
0
votes
1answer
617 views

md5pass or sha1pass on mac os

I'm looking for a hash tool on MacOS (shell), hope it works like md5pass on Ubuntu. Calculate case sensitive hash code. Calculate salted hash code. md5 is good, any other algorithm is ok. I ...
12
votes
2answers
2k views

How can zero byte files generate a hash value?

How can a zero byte text file generate a hash when hashed with sha1sum, sha256sum etc? What data are the programs hashing to generate a hash value? Ta
2
votes
0answers
853 views

Alternative to xxd that returns bytes?

I am on Mac OS X 10.8.2, running a compiled copy of xxd v1.10 (source code) as well as the copy of xxd that comes preinstalled on OS X. I am trying to generate a Base64-encoded SHA1 signature via a ...
1
vote
1answer
638 views

How Do I Troubleshoot Corrupt Downloads

I won't try to get this all documented in this first post, as I am sure you folks will have a ton of questions for me. I am having problems with my home LAN. For several weeks I have been having ...
5
votes
2answers
3k views

Installing sha1sum on git-bash (MinGW)

I've been using git-bash on Windows 7 a lot. I gather it is a wrapper of MinGW. It has md5sum but not sha1sum. I'd like to install sha1sum, but I can't figure out how. When I try mingw-get, it says "...
2
votes
3answers
577 views

why do we need SHA1 checksum?

In this page I saw the SHA1 checksum. I know it's a hash algorithm, but I don't know why we need it for download code. So I clicked "what's this?" but got no any more information. It's hash, so what?...
0
votes
1answer
953 views

Calculate SHA1 of CD-ROM on MacOS X

How do you calculate the sha1 of a CD-ROM disc under MacOS X? On Linux (RedHat) I use sha1sum /dev/cdrom. How do I do the same thing on Mac using openssl sha1?
35
votes
7answers
46k views

Is there a built-in method for computing an SHA-1 or MD5 hash in Windows 7? [duplicate]

Is there a built-in method for computing an SHA-1 or MD5 hash in Windows 7?