MOD5234-100IR NetBurner Inc, MOD5234-100IR Datasheet - Page 614
![MOD5234 10/100 ETHERNET MODULE](/photos/28/91/289101/mod-100ir_sml.jpg)
MOD5234-100IR
Manufacturer Part Number
MOD5234-100IR
Description
MOD5234 10/100 ETHERNET MODULE
Manufacturer
NetBurner Inc
Type
Controllers & Processorsr
Datasheets
1.MOD5272-100IR.pdf
(3 pages)
2.MOD5234-100IR.pdf
(4 pages)
3.MOD5234-100IR.pdf
(754 pages)
Specifications of MOD5234-100IR
Interface
I²C, SPI, UART
Voltage - Supply
2.5V
Mounting Type
Surface Mount
Package / Case
Module
Product
Modules
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Data Format
-
Baud Rates
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
Q4483564
- Current page: 614 of 754
- Download datasheet (13Mb)
Symmetric Key Hardware Accelerator (SKHA)
30.1.2.1 Data Ecryption Standard (DES & 3DES) Algorithm
The SKHA is able to perform bulk data encryption/decryption in compliance with the Data
Encryption Standard algorithm (ANSI x3.92, FIPS 46-2), as well as 3DES, which is an extension
of the DES algorithm.
In DES mode, the SKHA operates by permuting 64-bit data blocks with a shared key and an
initialization vector (IV). The SKHA supports two modes of IV operation: Electronic Code Book
(ECB) and Cipher Block Chaining (CBC).
The processor supplies data to the SKHA, and the data will be encrypted and subsequently made
available to the processor via an output FIFO. The session key is input to the block prior to
encryption.
DES is a block cipher that uses a 56-bit key (64 bits with CRC) to encrypt 64-bit blocks of data,
one block at a time. A conceptual diagram of this process is shown in
symmetric algorithm, so each of the two communicating parties share the same 64-bit key for
encryption and decryption. DES processing begins after this shared session key is agreed upon.
The text or binary message to be encrypted (typically called plaintext) is partitioned into n sets of
64-bit blocks. Each block is processed, in turn, by the DES engine, producing n sets of encrypted
(ciphertext) blocks. These blocks may be transmitted to the other entity.
Decryption is handled in the reverse manner. The ciphertext blocks are processed one at a time by
a DES module in the recipient’s system. The same key is used, and the DES block manages the
key processing internally so that the plaintext blocks are recovered.
In addition, the SKHA module can compute 3DES, which is an extension to the DES algorithm
whereby every 64-bit input block is processed three times. The SKHA supports two key (K1=K3)
or three key 3DES. A diagram of 3DES is shown in
30-2
block n
64-bit
block n-1
64-bit
Plaintext blocks
Plaintext blocks
...
block 2
64-bit
Figure 30-1. DES Encryption Process
MCF5235 Reference Manual, Rev. 2
block 1
64-bit
64-bit key
DES
Figure
block n
64-bit
30-2.
block n-1
Ciphertext blocks
64-bit
...
Figure
block 2
64-bit
Freescale Semiconductor
30-1. DES is a
block 1
64-bit
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