blob: b9c28c818b7c460ed65fb8045a22fa7d06640a79 [file] [log] [blame] [edit]
# 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