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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)
}
}
}
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