It seems to me it's your line endings...
echo -n "a" | md5sum gives me the same thing as md5_hex("a"). "a\n" and "a" should not hash to the same thing.
- "a" should be: 0cc175b9c0f1b6a831c399e269772661
- "a\x0a" should be: 60b725f10c9c85c70d97880dfe8191b3
- "a\x0d\x0a" should be: 0c629e1d3acda389c88a213374ec62fc
It's also worth noting that Digest::MD5 really is C, as much as /usr/bin/md5sum is: MD5.xs.
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