package cipher

import (
	"bytes"
	"crypto/internal/alias"
	"crypto/subtle"
)

type cbc struct {
	b         Block
	blockSize int
	iv        []byte
	tmp       []byte
}

func newCBC(b Block, iv []byte) *cbc {
	return &cbc{
		b:         b,
		blockSize: b.BlockSize(),
		iv:        bytes.Clone(iv),
		tmp:       make([]byte, b.BlockSize()),
	}
}

type cbcEncrypter cbc