Did you know that the CyaSSL lightweight SSL library has support for hardware-based cryptography and random number generation offered by the STM32 processor? Supported cryptographic algorithms include AES (CBC, CTR), DES (ECB, CBC), 3DES, MD5, and SHA1. For details regarding the STM32 crypto and hash processors, please see the STM32F2xx Standard Peripheral Library document (linked below).
Devices using the STM32 with CyaSSL can see substantial speed improvements when using hardware crypto versus using CyaSSL’s software crypto implementation. The following benchmarks were gathered from the CTaoCrypt benchmark application (ctaocrypt/benchmark/benchmark.c) running on the STM3221G-EVAL board (STM32F2) using the STM32F2 Standard Peripheral Library and FreeRTOS.
CyaSSL Software Crypto, Normal Big Integer Math Library
AES 1024 kB took 0.822 seconds, 1.22 MB/s
ARC4 1024 KB took 0.219 seconds, 4.57 MB/s
DES 1024 KB took 1.513 seconds, 0.66 MB/s
3DES 1024 KB took 3.986 seconds, 0.25 MB/s
MD5 1024 KB took 0.119 seconds, 8.40 MB/s
SHA 1024 KB took 0.279 seconds, 3.58 MB/s
SHA-256 1024 KB took 0.690 seconds, 1.45 MB/s
RSA 2048 encryption took 111.17 milliseconds, avg over 100 iterations
RSA 2048 decryption took 1204.77 milliseconds, avg over 100 iterations
DH 2048 key generation 467.90 milliseconds, avg over 100 iterations
DH 2048 key agreement 538.94 milliseconds, avg over 100 iterations
STM32F2 Hardware Crypto, Normal Big Integer Math Library
AES 1024 kB took 0.105 seconds, 9.52 MB/s
ARC4 1024 KB took 0.219 seconds, 4.57 MB/s
DES 1024 KB took 0.125 seconds, 8.00 MB/s
3DES 1024 KB took 0.141 seconds, 7.09 MB/s
MD5 1024 KB took 0.045 seconds, 22.22 MB/s
SHA 1024 KB took 0.047 seconds, 21.28 MB/s
SHA-256 1024 KB took 0.690 seconds, 1.45 MB/s
RSA 2048 encryption took 111.09 milliseconds, avg over 100 iterations
RSA 2048 decryption took 1204.88 milliseconds, avg over 100 iterations
DH 2048 key generation 467.56 milliseconds, avg over 100 iterations
DH 2048 key agreement 542.11 milliseconds, avg over 100 iterations
To enable STM32 hardware crypto and RNG support, define STM32F2_CRYPTO and STM32F2_RNG when building CyaSSL. For a more complete list of defines which may be required, please see the CYASSL_STM32F2 define in
If you would like to use CyaSSL with STM32 hardware-based cryptography or RNG, or have any questions, please contact us at facts@wolfssl.com for more information. The latest stable release of CyaSSL is available for download under the GPLv2 direct from the wolfSSL website.
CyaSSL embedded SSL library: http://wolfssl.com/yaSSL/Products-cyassl.html
STM32: http://www.st.com/internet/mcu/class/1734.jsp
STM32F2 Standard Peripheral Library documentation: http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/USER_MANUAL/DM00023896.pdf