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CONFIG_CRYPTO_AES_ARM: AES cipher algorithms (ARM-asm)

General informations

The Linux kernel configuration item CONFIG_CRYPTO_AES_ARM has multiple definitions:

AES cipher algorithms (ARM-asm) found in arch/arm/crypto/Kconfig

The configuration item CONFIG_CRYPTO_AES_ARM:

Help text

Use optimized AES assembler routines for ARM platforms.

AES cipher algorithms (FIPS-197). AES uses the Rijndael algorithm.

Rijndael appears to be consistently a very good performer in both hardware and software across a wide range of computing environments regardless of its use in feedback or non-feedback modes. Its key setup time is excellent, and its key agility is good. Rijndael's very low memory requirements make it very well suited for restricted-space environments, in which it also demonstrates excellent performance. Rijndael's operations are among the easiest to defend against power and timing attacks.

The AES specifies three key sizes: 128, 192 and 256 bits

See http://csrc.nist.gov/encryption/aes/ for more information.

AES cipher algorithms (ARM-asm) found in crypto/Kconfig

The configuration item CONFIG_CRYPTO_AES_ARM:

Help text

Use optimized AES assembler routines for ARM platforms.

AES cipher algorithms (FIPS-197). AES uses the Rijndael algorithm.

Rijndael appears to be consistently a very good performer in both hardware and software across a wide range of computing environments regardless of its use in feedback or non-feedback modes. Its key setup time is excellent, and its key agility is good. Rijndael's very low memory requirements make it very well suited for restricted-space environments, in which it also demonstrates excellent performance. Rijndael's operations are among the easiest to defend against power and timing attacks.

The AES specifies three key sizes: 128, 192 and 256 bits

See http://csrc.nist.gov/encryption/aes/ for more information.

Scalar AES cipher for ARM found in arch/arm/crypto/Kconfig

The configuration item CONFIG_CRYPTO_AES_ARM:

Help text

Use optimized AES assembler routines for ARM platforms.

On ARM processors without the Crypto Extensions, this is the fastest AES implementation for single blocks. For multiple blocks, the NEON bit-sliced implementation is usually faster.

This implementation may be vulnerable to cache timing attacks, since it uses lookup tables. However, as countermeasures it disables IRQs and preloads the tables; it is hoped this makes such attacks very difficult.

Hardware

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