Circuitry and methods for low-latency efficient chained decryption and decompression acceleration

A method comprising:

• sending, by a hardware processor core of a system, a descriptor comprising an indication of a hash key and encrypted data to be decrypted to an accelerator circuit of the system coupled to the hardware processor core;
• in response to receiving the descriptor, determining if the encrypted data is to be read in an encrypted order or a reverse order from the encrypted order by the accelerator circuit;
• in response to the determining that the encrypted data is to be read in the reverse order, generating a resultant authentication tag in the reverse order for the encrypted data based at least in part on the hash key by the accelerator circuit without reordering the encrypted data in the reverse order into the encrypted order;
• in response to the determining that the encrypted data is to be read in the encrypted order, generating the resultant authentication tag in the encrypted order for the encrypted data based at least in part on the hash key by the accelerator circuit;
• and
• writing the resultant authentication tag to storage.

An apparatus comprising:

• a hardware processor core;
• a memory;
• and
• an accelerator circuit coupled to the hardware processor core and the memory, the accelerator circuit to:
• in response to a descriptor, comprising an indication of a hash key and encrypted data in the memory to be decrypted, from the hardware processor core, perform a determination that the encrypted data is to be read in an encrypted order or a reverse order from the encrypted order,
• in response to the determination that the encrypted data is to be read in the reverse order, generate a resultant authentication tag in the reverse order for the encrypted data based at least in part on the hash key without reordering the encrypted data in the reverse order into the encrypted order, and,
• in response to the determination that the encrypted data is to be read in the encrypted order, generate the resultant authentication tag in the encrypted order for the encrypted data based at least in part on the hash key.