Block Cipher Mode of Operation (BCMO)

Overview

Block cipher mode of operation ca be used with any symmetric algorithms implemented with the SymmetricCryptoBlockIO interface.

Interface BCMO_Std

Interface		Signal		Description
cmd	Stream	valid/ready	Bool	Stream handshake
		key	Bits	The key used for the encryption/decryption
		iv*	Bits	Initialization Vector
		block	Bits	The block message to encrypt/decrypt
		enc*	Bool	Mode encrypt (1) or decrypt (0)
		mode	BCMO_Std_CmdMode	INIT/UPDATE
rsp	Flow	valid	Bool	Data valid

*this signal is optional

Block Cipher Mode of Operation

Electronic Codebook (ECB)

import spinal.core._
import spinal.lib._
import spinal.crypto.symmetric.des.DESCore_Std
import spinal.crypto.symmetric._

val core     = new DESCore_Std()
val chaining = ECB_Std(core.io.g, ENC_DEC)
chaining.io.core <> core.io
chaining.io.bcmo <> ...

Cipher Block Chaining (CBC)

import spinal.core._
import spinal.lib._
import spinal.crypto.symmetric.des.DESCore_Std
import spinal.crypto.symmetric._

val core     = new DESCore_Std()
val chaining = CBC_Std(core.io.g, ENC_DEC)
chaining.io.core <> core.io
chaining.io.bcmo <> ...

Output Feedback (OFB)

import spinal.core._
import spinal.lib._
import spinal.crypto.symmetric.des.DESCore_Std
import spinal.crypto.symmetric._

val core     = new DESCore_Std()
val chaining = OFB_Std(core.io.g, chainingMode = ENC_DEC, algoMode = ENCRYPT) 
chaining.io.core <> core.io
chaining.io.bcmo <> ...

Cipher Feedback (CFB)

import spinal.core._
import spinal.lib._
import spinal.crypto.symmetric.des.DESCore_Std
import spinal.crypto.symmetric._

val core     = new DESCore_Std()
val chaining = CFB_Std(core.io.g, chainingMode = ENC_DEC, algoMode = ENCRYPT) 
chaining.io.core <> core.io
chaining.io.bcmo <> ...