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建议参考 #183 排查下问题 @yushengery

``` func TestEncrypt(t *testing.T) { block, _ := kcp.NewAESBlockCrypt(make([]byte, 32)) src := make([]byte, 128) for k := range src { src[k] = byte(k) } dst := make([]byte, 128) block.Encrypt(dst, src)...