wolfSSL adds Silicon Labs Hardware acceleration support

wolfSSL is excited to announce support for using Silicon Labs Hardware acceleration. The EFR32 family of devices support multiple wireless interfaces with hardware cryptographic operations. wolfSSL can now offload cryptographic operations for dramatically increased performance on the Silicon Labs EFR32 family!

Our new support includes hardware acceleration of the following algorithms:

  • RNG
  • SHA-1
  • SHA-2

The new functionality can be enabled by defining WOLFSSL_SILABS_SE_ACCEL. In user_settings.h More details are available in the README.md in wolfcrypt/src/port/silabs of the wolfSSL tree.


Benchmark was performed on an EFR32 Gecko 2 (Series 1) using the xGM210P022.

The tests use Simplicity Studio v5 with Gecko SDK 3.0 using Micrium OS 5 and Secure Element Manager.

Algorithm Data Throughput (MB/s)
RNG 1.895
SHA 7.195
SHA-224 7.327
SHA-256 7.334
HMAC-SHA 6.304
HMAC-SHA224 6.329
HMAC-SHA256 6.323
AES-128-CBC-enc 4.897
AES-128-CBC-dec 4.907
AES-192-CBC-enc 4.795
AES-192-CBC-dec 4.805
AES-256-CBC-enc 4.703
AES-256-CBC-dec 4.712
AES-128-GCM-enc 4.463
AES-128-GCM-dec 4.317
AES-192-GCM-enc 4.377
AES-192-GCM-dec 4.235
AES-256-GCM-enc 4.297
AES-256-GCM-dec 4.162
AES-CCM-Enc 4.203
AES-CCM-Dec 4.045


ECC operation Average time to complete (ms) Operations per second
ECC 256 key gen 5.929 168.663
ECDHE 256 agree 5.440 183.816
ECDSA 256 sign 6.373 156.902
ECDSA 256 verify 6.727 148.662

Please contact us at facts@wolfssl.com  with any questions you have on wolfSSL, or just give us a call!