C Implementation of Cryptographic Algorithms

1 Software Benchmarks

All code was tested and benchmarked on the MSP430™ platform using IAR Embedded Workbench® IDE as the compiler tool. The optimization columns in the benchmark tables indicate the type of optimization used in IAR. Table 1-1 describes the settings used.

Table 1-1 Optimization Settings in IAR for Benchmark Testing

Optimized for	Optimization Level	Aggressive Unrolling	Aggressive In-Lining
Size	High => Size	No	No
Speed	High => Speed	Yes	Yes

1.1 AES Benchmarks

Table 1-2 Benchmarks for AES Library Functions Encrypting One 16 Byte Block

AES (ENC/DES Function)		Optimization		AES (ENC Only Function)		Optimization
AES (ENC/DES Function)		Speed	Size	AES (ENC Only Function)		Speed	Size
Memory (KB)	RAM (B)	34	34	Memory (KB)	RAM (B)	34	34
	Const	0.55	0.55		Const	0.29	0.29
	Code	1	0.83		Code	0.67	0.51
Clock Cycles (kilo-cycles)		7.9	12.3	Clock Cycles (kilo-cycles)		7.3	11.3

1.2 DES Benchmarks

Table 1-3 DES Code Size Benchmarks

DES Code Size	Optimization
DES Code Size	Speed	Size
RAM (B)	288	288
Const (KB)	2.3	2.3
Code (KB)	3.3	2.17

Table 1-4 Performance of Several DES Modes

DES Clock Cycle Count (kilo-cycles)	Optimization
DES Clock Cycle Count (kilo-cycles)	Speed	Size
DES (FULL) (One Data Block)	41	42.6
3DES (FULL) (One Data Block)	135.6	143.1
DES Key Scheduler (EN0 or DE1 modes)	34.7	36
DES Key Scheduler (ENDE mode)	69	72
DES Encode/Decode (One Data Block)	2.7	3.8
DES CBC Encode/Decode (2-block chain)	5.5	7.7
3DES CBC Encode/Decode (2-block chain)	139	149.7

1.3 SHA-2 Benchmarks

Table 1-5 Benchmarks for SHA-256 Library Function

SHA-256 (Data < 448 bits) ⁽¹⁾		Optimization
SHA-256 (Data < 448 bits) ⁽¹⁾		Speed	Size
Memory (KB)	RAM	0.328	0.328
	Const	0.264	0.328
	Code	3.72	1.87
Clock Cycles (kilo cycles)		34.1 (67)	44.3 (86.7)

(1) Values in () indicate a hashing of 448 bits < Data< 960 bits or 2 blocks of data.