ep-cktang / aes-256_hardware_design

VHDL design of the AES-256 encryption algorithm

AES-256 Hardware Design

Description:

VHDL hardware design of the AES-256 encryption algorithm for ASIC or FPGA implementation with SystemVerilog testbench

AES-256 is implemented as a two-part design - key expansion (key_expansion_top.vhd) and encryption (encryption_top.vhd). The 128-bit ciphertext is then taken by data loading (data_loading.vhd) block and sent down an 8-bit bus in 16 packets. Those three modules are instantiated in the design top aes256_loading.vhd

Testbench is implemented in a single SystemVerilog file aes256_loading_tb.sv. Python scripts (checker_gen.py and test_gen.py) are used to generate reference input (key and plaintext) and output (ciphertext) vectors. Input vectors are then used by the testbench to drive the DUT while output vectors are used in the checker.

Status
Basic functional verification is done with with 100 different keys and a 1000 different plaintext-ciphertext pairs for each key

Continued testbench development
UVM testbench: AES-256_UVM

Top level I/O and internal blocks

Timing diagram - Top level