# Function aes32esmi

Source

    pub fn aes32esmi(rs1: u32, rs2: u32, const BS: u8) -> u32

🔬This is a nightly-only experimental API. (`riscv_ext_intrinsics` #114544)
Available on RISC-V RV32 and target feature `zkne` only.
Expand description

AES middle round encryption instruction for RV32 with.

This instruction sources a single byte from rs2 according to bs. To this it applies the forward AES SBox operation, and a partial forward MixColumn, before XOR’ing the result with rs1. This instruction must always be implemented such that its execution latency does not depend on the data being operated on.

Source: RISC-V Cryptography Extensions Volume I: Scalar & Entropy Source Instructions

Version: v1.0.1

Section: 3.4

## §Note

The `bs` parameter is expected to be a constant value and only the bottom 2 bits of `bs` are used.