From d58a11e019813902b6c4547ca61a127938b2cc20 Mon Sep 17 00:00:00 2001 From: Eelco Dolstra Date: Fri, 14 Jan 2005 16:04:03 +0000 Subject: * Shorten SHA-256 hashes used in store path name generation to 160 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.) --- src/libstore/references.cc | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) (limited to 'src/libstore/references.cc') diff --git a/src/libstore/references.cc b/src/libstore/references.cc index 9b20b980a1b2..5ceae6427617 100644 --- a/src/libstore/references.cc +++ b/src/libstore/references.cc @@ -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; } -- cgit 1.4.1