1# SPDX-License-Identifier: GPL-2.0 2 3menu "Accelerated Cryptographic Algorithms for CPU (arm)" 4 5config CRYPTO_GHASH_ARM_CE 6 tristate "AEAD cipher: AES in GCM mode (ARMv8 Crypto Extensions)" 7 depends on KERNEL_MODE_NEON 8 select CRYPTO_AEAD 9 select CRYPTO_LIB_AES 10 select CRYPTO_LIB_GF128MUL 11 help 12 AEAD cipher: AES-GCM 13 14 Architecture: arm using 15 - ARMv8 Crypto Extensions 16 17config CRYPTO_AES_ARM_BS 18 tristate "Ciphers: AES, modes: ECB/CBC/CTR/XTS (bit-sliced NEON)" 19 depends on KERNEL_MODE_NEON 20 select CRYPTO_SKCIPHER 21 select CRYPTO_LIB_AES 22 help 23 Length-preserving ciphers: AES cipher algorithms (FIPS-197) 24 with block cipher modes: 25 - ECB (Electronic Codebook) mode (NIST SP800-38A) 26 - CBC (Cipher Block Chaining) mode (NIST SP800-38A) 27 - CTR (Counter) mode (NIST SP800-38A) 28 - XTS (XOR Encrypt XOR with ciphertext stealing) mode (NIST SP800-38E 29 and IEEE 1619) 30 31 Bit sliced AES gives around 45% speedup on Cortex-A15 for CTR mode 32 and for XTS mode encryption, CBC and XTS mode decryption speedup is 33 around 25%. (CBC encryption speed is not affected by this driver.) 34 35 The bit sliced AES code does not use lookup tables, so it is believed 36 to be invulnerable to cache timing attacks. However, since the bit 37 sliced AES code cannot process single blocks efficiently, in certain 38 cases table-based code with some countermeasures against cache timing 39 attacks will still be used as a fallback method; specifically CBC 40 encryption (not CBC decryption), the encryption of XTS tweaks, XTS 41 ciphertext stealing when the message isn't a multiple of 16 bytes, and 42 CTR when invoked in a context in which NEON instructions are unusable. 43 44config CRYPTO_AES_ARM_CE 45 tristate "Ciphers: AES, modes: ECB/CBC/CTS/CTR/XTS (ARMv8 Crypto Extensions)" 46 depends on KERNEL_MODE_NEON 47 select CRYPTO_SKCIPHER 48 select CRYPTO_LIB_AES 49 help 50 Length-preserving ciphers: AES cipher algorithms (FIPS-197) 51 with block cipher modes: 52 - ECB (Electronic Codebook) mode (NIST SP800-38A) 53 - CBC (Cipher Block Chaining) mode (NIST SP800-38A) 54 - CTR (Counter) mode (NIST SP800-38A) 55 - CTS (Cipher Text Stealing) mode (NIST SP800-38A) 56 - XTS (XOR Encrypt XOR with ciphertext stealing) mode (NIST SP800-38E 57 and IEEE 1619) 58 59 Architecture: arm using: 60 - ARMv8 Crypto Extensions 61 62endmenu 63 64