# SPDX-License-Identifier: GPL-2.0 menu "Accelerated Cryptographic Algorithms for CPU (arm)" config CRYPTO_GHASH_ARM_CE tristate "Hash functions: GHASH (PMULL/NEON/ARMv8 Crypto Extensions)" depends on KERNEL_MODE_NEON select CRYPTO_AEAD select CRYPTO_HASH select CRYPTO_CRYPTD select CRYPTO_LIB_AES select CRYPTO_LIB_GF128MUL help GCM GHASH function (NIST SP800-38D) Architecture: arm using - PMULL (Polynomial Multiply Long) instructions - NEON (Advanced SIMD) extensions - ARMv8 Crypto Extensions Use an implementation of GHASH (used by the GCM AEAD chaining mode) that uses the 64x64 to 128 bit polynomial multiplication (vmull.p64) that is part of the ARMv8 Crypto Extensions, or a slower variant that uses the vmull.p8 instruction that is part of the basic NEON ISA. config CRYPTO_AES_ARM_BS tristate "Ciphers: AES, modes: ECB/CBC/CTR/XTS (bit-sliced NEON)" depends on KERNEL_MODE_NEON select CRYPTO_SKCIPHER select CRYPTO_LIB_AES help Length-preserving ciphers: AES cipher algorithms (FIPS-197) with block cipher modes: - ECB (Electronic Codebook) mode (NIST SP800-38A) - CBC (Cipher Block Chaining) mode (NIST SP800-38A) - CTR (Counter) mode (NIST SP800-38A) - XTS (XOR Encrypt XOR with ciphertext stealing) mode (NIST SP800-38E and IEEE 1619) Bit sliced AES gives around 45% speedup on Cortex-A15 for CTR mode and for XTS mode encryption, CBC and XTS mode decryption speedup is around 25%. (CBC encryption speed is not affected by this driver.) The bit sliced AES code does not use lookup tables, so it is believed to be invulnerable to cache timing attacks. However, since the bit sliced AES code cannot process single blocks efficiently, in certain cases table-based code with some countermeasures against cache timing attacks will still be used as a fallback method; specifically CBC encryption (not CBC decryption), the encryption of XTS tweaks, XTS ciphertext stealing when the message isn't a multiple of 16 bytes, and CTR when invoked in a context in which NEON instructions are unusable. config CRYPTO_AES_ARM_CE tristate "Ciphers: AES, modes: ECB/CBC/CTS/CTR/XTS (ARMv8 Crypto Extensions)" depends on KERNEL_MODE_NEON select CRYPTO_SKCIPHER select CRYPTO_LIB_AES help Length-preserving ciphers: AES cipher algorithms (FIPS-197) with block cipher modes: - ECB (Electronic Codebook) mode (NIST SP800-38A) - CBC (Cipher Block Chaining) mode (NIST SP800-38A) - CTR (Counter) mode (NIST SP800-38A) - CTS (Cipher Text Stealing) mode (NIST SP800-38A) - XTS (XOR Encrypt XOR with ciphertext stealing) mode (NIST SP800-38E and IEEE 1619) Architecture: arm using: - ARMv8 Crypto Extensions endmenu
