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Summary
Microchip offers a reliable security solution for embedded applications built on the 16- and 32-bit microcontroller platform. This solution is provided by means of a single library. This library features the symmetric key encryption/decryption functions Advanced Encryption Standard (AES) and Triple-Data Encryption Algorithm (Triple-DES). These algorithms are also recommended by most Internet Engineering Task Force (IETF), Federal Information Processing Standards (FIPS) and IPSec standards.)
Features
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Optimized for speed, code size and RAM usage
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Library functions tested for adherence to applicable standards
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Application note describes APIs
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Several examples of use are provided for each library function
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All Microchip 16-bit Families supported
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Typical Applications
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Web access
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Secure XML transactions
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Virtual Private Networks (VPN)
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Secure transfer of stored calibration data
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Cryptographic Functions: 16-bit MCUs and DSCs
Cryptographic Algorithm
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Applicable Specification
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Cryptographic Function(1)
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Code Size (bytes)
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Data Rate(2) (Kbytes,sec)
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T-DES
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FIPS 46-3
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Basic Encryption and Decryption
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7500
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19.8 (16 MIPS)
49.5 (40 MIPS)
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AES (128-bit)
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FIPS 197
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Basic Encryption
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3018
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74.1 (16 MIPS)
184.7 (40 MIPS)
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Notes:
1) AES and T-DES data rate represents the average of the data rates for performing basic encryption and decryption functions for a single block of data.
2) Wrapper functions are used in combination with the underlying basic encryption and/or decryption functions for the respective algorithm (AES,T-DES).
Cryptographic Functions: 32-bit MCUs
Cryptographic Algorithm
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Cryptographic Function
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CPU Cycle Times in uSec (1,2)
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Throughput (Kbytes/sec)
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AES (128-bit)
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Create Session Key
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40.45
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764
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Encryption Block
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20.45
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Decrypt Block
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20.45
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AES (192-bit)
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Create Session Key
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48.83
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634.4
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Encryption Block
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24.63
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Decrypt Block
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24.63
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AES (256-bit)
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Create Session Key
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57.68
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544.4
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Encryption Block
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28.70
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Decrypt Block
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28.70
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AES Library for PIC32 MCUs Memory Usage:
With MIPS32 Instructions: 14.9 KB
With MIPS16 Instructions: 13.9 KB
Notes:
1) Speed (Time) optimized -03 loops unrolled.
2) PIC32 MCU running at 80 MHz.
Encryption software can be downloaded below as part of the Data Encryption Libraries.
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