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NuttX emits no AES instruction on any arm64 core. There is no runtime feature dispatch in arch/arm64, so every AES goes through crypto/rijndael.c or crypto/aes.c, and the table-driven one indexes memory with key-dependent values, so its timing follows the cache. Provide aes_cypher() for ECB, CBC and CTR built on AESE, AESD and the MixColumns pair, and register it with /dev/crypto as a hardware driver alongside the existing stm32h7, sam34 and esp32 modules. ID_AA64ISAR0_EL1.AES is read on every call, which returns -ENOTSUP rather than trapping on a core without the extension. Verified against the NIST SP 800-38A appendix F vectors for ECB-128, ECB-256, CBC-128, CBC-192 and CTR-128, encrypt and decrypt, in place and out of place. Signed-off-by: Royyan Zahir <royzah@gmail.com> |
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