I saw your comment above that the problem seems to be in the transferring of the file. In addition to that, I just wanted to confirm what syphilis suggested: After transfer you should be using the "b" mode. From the Digest::SHA docs (emphasis mine):
The "p" mode is handy since it ensures that the digest value of $filename will be the same when computed on different operating systems. It accomplishes this by internally translating all newlines in text files to UNIX format before calculating the digest. Binary files are read in raw mode with no translation whatsoever.
The name "portable" is a bit confusing here.
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