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DES Encryption / Decryption

• Technology Overview
Data Encryption Standard (DES) is a symmetric key algorithm. DES is designed to encrypt and decrypt blocks of data (multiple of 64 bits) using a 64-bit private key. Its security is based on the secure private key. Messages are encrypted and decrypted using the same private key.


• Product Features
• Compatible with "Data Encryption Standard (DES)", FIPS PUB46-3, Federal Information Processing Standards Publication, Reaffirmed, 1999 October 25.
• Supports ECB and CBC modes.
• APIs for key schedule, encryption and decryption.
• Flexible interface with 'C' callability.
• Easily portable to other architectures.
• The code is interruptible and fully re-entrant. It can be used in systems with multi threaded software architecture.


• Processor
• ARM-7TDMI with 8KB unified cache and 64 MHz clock.


• Performance
• Memory Requirements

ROM(Bytes)		RAM(Bytes)
Code	Table	Data	Stack
3948	4704	128	88

• Timings

Key Generation (usec)	Encryption (usec)	Decryption (usec)
44 - 64	48 - 72	44 - 60

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