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-rw-r--r--nix/libutil/hash.cc7
1 files changed, 5 insertions, 2 deletions
diff --git a/nix/libutil/hash.cc b/nix/libutil/hash.cc
index 9ba604eb85..9b83ffcdd9 100644
--- a/nix/libutil/hash.cc
+++ b/nix/libutil/hash.cc
@@ -76,8 +76,11 @@ string printHash(const Hash & hash)
Hash parseHash(HashType ht, const string & s)
{
Hash hash(ht);
- if (s.length() != hash.hashSize * 2)
- throw Error(format("invalid hash `%1%'") % s);
+ if (s.length() != hash.hashSize * 2) {
+ string algo = gcry_md_algo_name(ht);
+ throw Error(format("invalid %1% hash '%2%' (%3% bytes but expected %4%)")
+ % algo % s % (s.length() / 2) % hash.hashSize);
+ }
for (unsigned int i = 0; i < hash.hashSize; i++) {
string s2(s, i * 2, 2);
if (!isxdigit(s2[0]) || !isxdigit(s2[1]))