Cryptodev/af_alg engines in OpenSSL on STM32MP157C-DK2 do not provide hash algorithms for hardware acceleration
Hello,
I have successfully compiled and deployed the distribution package (trusted) onto the STM32MP1. I am using OpenSSL in a program for signing data, where SHA256 is used as a hash. I would like to take advantage of hardware acceleration by using either the cryptodev or af_alg engines. The distribution provides Yocto recipes for cryptodev-linux (header), cryptodev-module (kernel module) of version 1.9 and for OpenSSL version 1.1.1b, in which I modified the PACKAGECONFIG line by adding cryptodev-linux option in it, so OpenSSL compiles with the cryptodev support. The 3 aforementioned recipes were built and deployed using devtool. OpenSSL also provides a built-in AF_ALG engine by default. However, the supported algorithms of both engines are only ciphers, there are no hash algorithms whatsoever. I also tried to build OpenSSL with the -DUSE_CRYPTODEV_DIGESTS, but that didnt change anything. Version 1.0.2 of OpenSSL however, provides some hashing algorithms like MD5 and SHA1, but not SHA256. I have also posted an issue on OpenSSL github, but maybe there is a problem on STM side. The output of cat /proc/crypto lists
SHA256 among many other hashes, which means it should be supported.
I would appreciate any help regarding this issue.