#include <simd_hwaes.h>

Public Member Functions
SIMD_4x32 BOTAN_FN_ISA_HWAES	affine_transform (SIMD_4x32 x) const
consteval	Gf2AffineTransformation (uint64_t M, uint8_t c)

Static Public Member Functions
static consteval Gf2AffineTransformation	post_inv_sbox (uint64_t M, uint8_t c)
static consteval Gf2AffineTransformation	post_sbox (uint64_t M, uint8_t c)

Detailed Description

Lookup tables for GF(2) affine transformations

Definition at line 122 of file simd_hwaes.h.

Constructor & Destructor Documentation

◆ Gf2AffineTransformation()

Botan::Gf2AffineTransformation::Gf2AffineTransformation	(	uint64_t	M,
		uint8_t	c )

inlineconsteval

Definition at line 124 of file simd_hwaes.h.

                                                               : lo{}, hi{} {
         for(size_t i = 0; i != 16; ++i) {
            // Low nibble table includes the constant addition
            const uint8_t lo_val = detail::gf2_mat_vec(M, static_cast<uint8_t>(i)) ^ c;
            const uint8_t hi_val = detail::gf2_mat_vec(M, static_cast<uint8_t>(i << 4));
 
            lo[i / 4] |= static_cast<uint32_t>(lo_val) << (8 * (i % 4));
            hi[i / 4] |= static_cast<uint32_t>(hi_val) << (8 * (i % 4));
         }
      }

References Botan::detail::gf2_mat_vec().

Referenced by post_inv_sbox(), and post_sbox().

Member Function Documentation

◆ affine_transform()

SIMD_4x32 BOTAN_FN_ISA_HWAES Botan::Gf2AffineTransformation::affine_transform ( SIMD_4x32 x ) const

inline

Definition at line 155 of file simd_hwaes.h.

                                                                              {
         const SIMD_4x32 tbl_lo(lo[0], lo[1], lo[2], lo[3]);
         const SIMD_4x32 tbl_hi(hi[0], hi[1], hi[2], hi[3]);
         const auto lo_mask = SIMD_4x32::splat_u8(0x0F);
 
         return SIMD_4x32::byte_shuffle(tbl_lo, lo_mask & x) ^ SIMD_4x32::byte_shuffle(tbl_hi, lo_mask & x.shr<4>());
      }

References Botan::SIMD_4x32::byte_shuffle(), Botan::SIMD_4x32::shr(), and Botan::SIMD_4x32::splat_u8().

◆ post_inv_sbox()

consteval Gf2AffineTransformation Botan::Gf2AffineTransformation::post_inv_sbox	(	uint64_t	M,
		uint8_t	c )

inlinestaticconsteval

Derive tables used for computing an affine transform after the application of an AES inverse sbox.

Definition at line 149 of file simd_hwaes.h.

                                                                                    {
         const auto comb_mat = detail::gf2_mat_mul(detail::AES_AFF, M);
         const auto comb_c = detail::gf2_mat_vec(detail::AES_AFF, static_cast<uint8_t>(c ^ detail::AES_C_INV));
         return Gf2AffineTransformation(comb_mat, comb_c);
      }

References Botan::detail::AES_AFF, Botan::detail::AES_C_INV, Botan::detail::gf2_mat_mul(), Botan::detail::gf2_mat_vec(), and Gf2AffineTransformation().

◆ post_sbox()

consteval Gf2AffineTransformation Botan::Gf2AffineTransformation::post_sbox	(	uint64_t	M,
		uint8_t	c )

inlinestaticconsteval

Derive tables used for computing an affine transform after the application of an AES sbox.

Definition at line 139 of file simd_hwaes.h.

                                                                                {
         const auto comb_M = detail::gf2_mat_mul(M, detail::AES_AFF_INV);
         const auto comb_c = static_cast<uint8_t>(detail::gf2_mat_vec(comb_M, detail::AES_C) ^ c);
         return Gf2AffineTransformation(comb_M, comb_c);
      }

References Botan::detail::AES_AFF_INV, Botan::detail::AES_C, Botan::detail::gf2_mat_mul(), Botan::detail::gf2_mat_vec(), and Gf2AffineTransformation().

The documentation for this class was generated from the following file:

src/lib/utils/simd/simd_hwaes/simd_hwaes.h

Public Member Functions