MCF5270CAB100 Freescale Semiconductor, MCF5270CAB100 Datasheet - Page 494

• Manufacturer Part Number: MCF5270CAB100
• Description: MCU V2 COLDFIRE 64K SRAM 160-QFP
• Manufacturer: Freescale Semiconductor
• Series: MCF527xr

Specifications of MCF5270CAB100

• Core Processor: Coldfire V2
• Core Size: 32-Bit
• Speed: 100MHz
• Connectivity: EBI/EMI, Ethernet, I²C, SPI, UART/USART
• Peripherals: DMA, WDT
• Number Of I /o: 39
• Program Memory Type: ROMless
• Ram Size: 64K x 8
• Voltage - Supply (vcc/vdd): 1.4 V ~ 1.6 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 160-QFP
• Processor Series: MCF527x
• Core: ColdFire V2
• 3rd Party Development Tools: JLINK-CF-BDM26, EWCF
• Development Tools By Supplier: NNDK-MOD5272-KIT, NNDK-MOD5270-KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details

Message Digest Hardware Accelerator (MDHA)
This module is useful in many applications including hashing messages to generate digital
signatures or computation of a shared secret. The digital signature is typically computed on a small
input, however if the data to be signed is large, it is inefficient to sign the entire data. Instead, the
large input data is hashed to a smaller value which is then signed. If the message is also sent to the
verifying authority along with the signature, the verifying authority can verify the signature by
recovering the hash value from the signature using the public key of the sender, hashing the
message itself, and then comparing the computed hash value with the recovered hash value. If they
match, then the verifying authority is confident that the data was signed by the owner of the private
key that matches the public key, where the private key presumably is only known by the sender.
This provides a measure of authentication and non-repudiation.
A conceptual block diagram of the MDHA module is shown in
are written to the MDHA module, and at the end, the hash value is read as the 160-bit output for
SHA-1 or 128-bit output for MD5.
26.1.3
26-2
• One-way hashing generation—a message digest, or a hash, is the result of a one-way
function performed on a message. Two different hash functions can be used:
— SHA-1: Secure Hash Algorithm defined in Federal Information Processing Standards
Publication 180-1.
block n
512-bit
Modes of Operation
block n-1
512-bit
Plaintext blocks
...
512-bit
block 2
Figure 26-1. MDHA Hashing Process
MCF5271 Reference Manual, Rev. 2
512-bit
block 1
160-bit constant
128-bit constant
SHA-1
MD5
Figure
Hash value
Hash value
160-bit
128-bit
value
value
26-1. Multiple input blocks
Freescale Semiconductor
Output
Register