Use libsodium instead of OpenSSL for binary cache signing

Sodium's Ed25519 signatures are much shorter than OpenSSL's RSA
signatures. Public keys are also much shorter, so they're now
specified directly in the nix.conf option ‘binary-cache-public-keys’.

The new command ‘nix-store --generate-binary-cache-key’ generates and
prints a public and secret key.

1 files changed, 50 insertions, 0 deletions

diff --git a/tests/binary-cache.sh b/tests/binary-cache.sh
index 6f0c36f630..b0e7f63ae0 100644
--- a/tests/binary-cache.sh
+++ b/tests/binary-cache.sh
@@ -87,3 +87,53 @@ rm $(grep -l "StorePath:.*dependencies-input-2" $cacheDir/*.narinfo)
 
 nix-build --option binary-caches "file://$cacheDir" dependencies.nix -o $TEST_ROOT/result 2>&1 | tee $TEST_ROOT/log
 grep -q "Downloading" $TEST_ROOT/log
+
+
+# Create a signed binary cache.
+clearCache
+
+declare -a res=($(nix-store --generate-binary-cache-key test.nixos.org-1))
+publicKey="${res[0]}"
+secretKey="${res[1]}"
+echo "$secretKey" > $TEST_ROOT/secret-key
+
+res=($(nix-store --generate-binary-cache-key test.nixos.org-1))
+badKey="${res[0]}"
+
+res=($(nix-store --generate-binary-cache-key foo.nixos.org-1))
+otherKey="${res[0]}"
+
+nix-push --dest $cacheDir --key-file $TEST_ROOT/secret-key $outPath
+
+
+# Downloading should fail if we don't provide a key.
+clearStore
+
+rm -f $NIX_STATE_DIR/binary-cache*
+
+(! nix-store -r $outPath --option binary-caches "file://$cacheDir" --option signed-binary-caches '*' )
+
+
+# And it should fail if we provide an incorrect key.
+clearStore
+
+rm -f $NIX_STATE_DIR/binary-cache*
+
+(! nix-store -r $outPath --option binary-caches "file://$cacheDir" --option signed-binary-caches '*' --option binary-cache-public-keys "$badKey")
+
+
+# It should succeed if we provide the correct key.
+nix-store -r $outPath --option binary-caches "file://$cacheDir" --option signed-binary-caches '*' --option binary-cache-public-keys "$otherKey $publicKey"
+
+
+# It should fail if we corrupt the .narinfo.
+clearStore
+
+for i in $cacheDir/*.narinfo; do
+    grep -v References $i > $i.tmp
+    mv $i.tmp $i
+done
+
+rm -f $NIX_STATE_DIR/binary-cache*
+
+(! nix-store -r $outPath --option binary-caches "file://$cacheDir" --option signed-binary-caches '*' --option binary-cache-public-keys "$publicKey")