This Intel® QAT OpenSSL* Engine supports Multi-buffer based software acceleration for asymmetric PKE algorithms RSA, ECDH X25519, ECDH P-256/P-384 and ECDSA P-256/P-384, SM2, SM3, SM4-CBC, SM4-GCM, SM4-CCM using the Intel® Crypto Multi-buffer library based on Intel® AVX-512 Integer Fused Multiply Add (IFMA) operations.
This Support, when enabled by the user using the build instructions for qat_sw target performs operation by batching up multiple requests maintained in queues and uses the OpenSSL asynchronous infrastructure to submit the batched requests up to 8 to Crypto Multi-buffer API which processes them in parallel using AVX512 vector instructions. QAT SW Multi-buffer acceleration will be beneficial to use only in asynchronous mode where there are many parallel connections to fully utilize multibuffer operation.
Software based acceleration for AES-GCM is supported via the Intel® Multi-Buffer Crypto for IPsec Library. The implementation at engine for AES-GCM follows synchronous mechanism to submit requests to the IPSec_MB library which processes requests in multiple blocks using vectorized AES,AVX2 and AVX512 instructions from the processor.
Software acceleration features are only supported in the system that supports Intel® AVX-512 with the following instruction set extensions:
AVX512F AVX512_IFMA VAES VPCLMULQDQ AVX2