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Move the aes_encrypt_zvkned() and aes_decrypt_zvkned() assembly
functions into lib/crypto/, wire them up to the AES library API, and
remove the "aes-riscv64-zvkned" crypto_cipher algorithm.
To make this possible, change the prototypes of these functions to
take (rndkeys, key_len) instead of a pointer to crypto_aes_ctx, and
change the RISC-V AES-XTS code to implement tweak encryption using the
AES library instead of directly calling aes_encrypt_zvkned().
The result is that both the AES library and crypto_cipher APIs use
RISC-V's AES instructions, whereas previously only crypto_cipher did
(and it wasn't enabled by default, which this commit fixes as well).
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20260112192035.10427-15-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
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