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Diffstat (limited to 'internal/cryptocore/hkdf_test.go')
-rw-r--r--internal/cryptocore/hkdf_test.go46
1 files changed, 46 insertions, 0 deletions
diff --git a/internal/cryptocore/hkdf_test.go b/internal/cryptocore/hkdf_test.go
new file mode 100644
index 0000000..96ee01f
--- /dev/null
+++ b/internal/cryptocore/hkdf_test.go
@@ -0,0 +1,46 @@
+package cryptocore
+
+import (
+ "bytes"
+ "encoding/hex"
+ "testing"
+)
+
+type hkdfTestCase struct {
+ masterkey []byte
+ info string
+ out []byte
+}
+
+// TestHkdfDerive verifies that we get the expected values from hkdfDerive. They
+// must not change because this would change the on-disk format.
+func TestHkdfDerive(t *testing.T) {
+ master0 := bytes.Repeat([]byte{0x00}, 32)
+ master1 := bytes.Repeat([]byte{0x01}, 32)
+ out1, _ := hex.DecodeString("9ba3cddd48c6339c6e56ebe85f0281d6e9051be4104176e65cb0f8a6f77ae6b4")
+ out2, _ := hex.DecodeString("e8a2499f48700b954f31de732efd04abce822f5c948e7fbc0896607be0d36d12")
+ out3, _ := hex.DecodeString("9137f2e67a842484137f3c458f357f204c30d7458f94f432fa989be96854a649")
+ out4, _ := hex.DecodeString("0bfa5da7d9724d4753269940d36898e2c0f3717c0fee86ada58b5fd6c08cc26c")
+
+ testCases := []hkdfTestCase{
+ {master0, "EME filename encryption", out1},
+ {master0, hkdfInfoEMENames, out1},
+ {master1, "EME filename encryption", out2},
+ {master1, hkdfInfoEMENames, out2},
+ {master1, "AES-GCM file content encryption", out3},
+ {master1, hkdfInfoGCMContent, out3},
+ {master1, "AES-SIV file content encryption", out4},
+ {master1, hkdfInfoSIVContent, out4},
+ }
+
+ for i, v := range testCases {
+ out := hkdfDerive(v.masterkey, v.info, 32)
+ if !bytes.Equal(out, v.out) {
+ want := hex.EncodeToString(v.out)
+ have := hex.EncodeToString(out)
+ t.Errorf("testcase %d error:\n"+
+ "want=%s\n"+
+ "have=%s", i, want, have)
+ }
+ }
+}