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package pathiv
import (
"bytes"
"encoding/hex"
"testing"
)
// TestBlockIV makes sure we don't change the block iv derivation algorithm "BlockIV()"
// inadvertedly.
func TestBlockIV(t *testing.T) {
b0 := make([]byte, 16)
b0x := BlockIV(b0, 0)
if !bytes.Equal(b0, b0x) {
t.Errorf("b0x should be equal to b0")
}
b27 := BlockIV(b0, 0x27)
expected, _ := hex.DecodeString("00000000000000000000000000000027")
if !bytes.Equal(b27, expected) {
t.Errorf("\nhave=%s\nwant=%s", hex.EncodeToString(b27), hex.EncodeToString(expected))
}
bff := bytes.Repeat([]byte{0xff}, 16)
b28 := BlockIV(bff, 0x28)
expected, _ = hex.DecodeString("ffffffffffffffff0000000000000027")
if !bytes.Equal(b28, expected) {
t.Errorf("\nhave=%s\nwant=%s", hex.EncodeToString(b28), hex.EncodeToString(expected))
}
}
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