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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/nix-env/main.cc
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@ -34,10 +34,6 @@ struct DrvInfo
Path drvPath;
Path outPath;
Hash drvHash;
DrvInfo() : drvHash(htMD5)
{
}
};
typedef map<Path, DrvInfo> DrvInfos;
@ -74,7 +70,7 @@ bool parseDerivation(EvalState & state, Expr e, DrvInfo & drv)
a = queryAttr(e, "drvHash");
if (!a) throw badTerm("derivation hash missing", e);
drv.drvHash = parseHash(evalString(state, a));
drv.drvHash = parseHash(htMD5, evalString(state, a));
a = queryAttr(e, "outPath");
if (!a) throw badTerm("output path missing", e);
@ -205,7 +201,7 @@ void createUserEnv(EvalState & state, const DrvInfos & drvs,
makeBind(toATerm("drvPath"),
makePath(toATerm(i->second.drvPath)), makeNoPos()),
makeBind(toATerm("drvHash"),
makeStr(toATerm((string) i->second.drvHash)), makeNoPos()),
makeStr(toATerm(printHash(i->second.drvHash))), makeNoPos()),
makeBind(toATerm("outPath"),
makePath(toATerm(i->second.outPath)), makeNoPos())
));