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* Shorten SHA-256 hashes used in store path name generation to 160

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bits, then encode them in a radix-32 representation (using digits
  and letters except e, o, u, and t).  This produces store paths like
  /nix/store/4i0zb0z7f88mwghjirkz702a71dcfivn-aterm-2.3.1.  The nice
  thing about this is that the hash part of the file name is still 32
  characters, as before with MD5.

  (Of course, shortening SHA-256 to 160 bits makes it no better than
  SHA-160 in theory, but hopefully it's a bit more resistant to
  attacks; it's certainly a lot slower.)
This commit is contained in:
Eelco Dolstra 2005-01-14 16:04:03 +00:00
parent 9530cc3170
commit d58a11e019
7 changed files with 108 additions and 36 deletions
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8
src/libstore/references.cc
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@ -81,8 +81,12 @@ Strings filterReferences(const string & path, const Strings & paths)
for (Strings::const_iterator i = paths.begin();
i != paths.end(); i++)
{
string s = string(baseNameOf(*i), 0, 32);
parseHash(s);
string baseName = baseNameOf(*i);
unsigned int pos = baseName.find('-');
if (pos == string::npos)
throw Error(format("bad reference `%1%'") % *i);
string s = string(baseName, 0, pos);
// parseHash(htSHA256, s);
ids.push_back(s);
backMap[s] = *i;
}