incorrect length IV") } copy(x.iv[:], iv) } func cryptBlocksEncGeneri(b *Block, civ *[BlockSize]byte, dst, src []byte) { iv := civ[:] for len(src) > 0 { // Write the xor to dst, then encrypt in place. subtle.XORBytes(dst[:BlockSize], src[:BlockSize], iv) encryptBlock(b, dst[:BlockSize], dst[:BlockSize]) // Move to the next block with this block as the next iv. iv = dst[:BlockSize] src = src[BlockSize:] dst = dst[BlockSize:] } // Save the iv for the next CryptBlocks call. copy(civ[:], iv) } type CBCDecrypter...