隨著物聯網的發展, 在嵌入式系統(embedded system)中使用各種密碼算法進行數據保護和身份認證逐漸成為一項基本需求. 但是, 增加密碼算法會影響嵌入式系統的性能嗎? 會影響到什么程度? 我應該選擇什么樣的密碼算法呢?

為了回答上面的問題, 我們首先從在IoT中使用較為廣泛的STM32系列CPU開始, 移植各類密碼算法, 并將主要算法性能發布在這里, 供各位參考.

STM32F107ZE@72MHZ
Flash: 512KB
RAM: 64KB

[code lang=”shell”]
AES 25 kB 0.052 seconds, 0.466 MB/s
Camellia 25 kB 0.048 seconds, 0.513 MB/s
ARC4 25 kB 0.010 seconds, 2.511 MB/s
RABBIT 25 kB 0.019 seconds, 1.259 MB/s
3DES 25 kB 0.242 seconds, 0.101 MB/s
SM4 25 kB 0.076 seconds, 0.320 MB/s
ZUC 25 kB 0.035 seconds, 0.702 MB/s

MD5 25 kB 0.010 seconds, 2.548 MB/s
SHA 25 kB 0.015 seconds, 1.666 MB/s
SHA-256 25 kB 0.029 seconds, 0.854 MB/s
SHA-384 25 kB 0.073 seconds, 0.335 MB/s
SHA-512 25 kB 0.078 seconds, 0.313 MB/s
SM3 25 kB 0.041 seconds, 0.590 MB/s

RSA 2048 public encryption 255.043 milliseconds, 3.92/s
RSA 2048 private decryption 2619.672 milliseconds, 0.38/s
RSA 2048 sign 2619.346 milliseconds, 0.38/s
RSA 2048 verify 254.671 milliseconds, 3.93/s

DH 2048 key generation 1008.250 milliseconds, 0.99/s
DH 2048 key agreement 1162.475 milliseconds, 0.86/s

ECC 256 key generation 419.448 milliseconds, 2.38/s
EC-DHE key agreement 477.113 milliseconds, 2.10/s
EC-DSA sign time 510.192 milliseconds, 1.96/s
EC-DSA verify time 955.580 milliseconds, 1.05/s
[/code]