-func (c *Cipher) NewCFBEncrypter(iv [BlockSize]byte) *CFBEncrypter {
- return &CFBEncrypter{c, iv[:]}
+func (c *Cipher) NewCFBEncrypter(iv []byte) *CFBEncrypter {
+ if len(iv) != BlockSize {
+ panic("iv length is not equal to blocksize")
+ }
+ encrypter := CFBEncrypter{c: c, iv: make([]byte, BlockSize)}
+ copy(encrypter.iv, iv)
+ return &encrypter