# Function core::arch::riscv32::aes32dsi

source ·

    pub unsafe fn aes32dsi(rs1: u32, rs2: u32, const BS: u8) -> u32

🔬This is a nightly-only experimental API. (`stdsimd` #48556)
Available on RISC-V RV32 and target feature `zknd` only.
Expand description

AES final round decryption instruction for RV32.

This instruction sources a single byte from rs2 according to bs. To this it applies the inverse AES SBox operation, and XOR’s 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: 3.1

## §Note

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

## §Safety

This function is safe to use if the `zknd` target feature is present.