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/*
* Fallback for sync aes(ctr) in contexts where kernel mode NEON
* is not allowed
*
* Copyright (C) 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <crypto/aes.h>
#include <crypto/internal/skcipher.h>
asmlinkage void __aes_arm64_encrypt(u32 *rk, u8 *out, const u8 *in, int rounds);
static inline int aes_ctr_encrypt_fallback(struct crypto_aes_ctx *ctx,
struct skcipher_request *req)
{
struct skcipher_walk walk;
u8 buf[AES_BLOCK_SIZE];
int err;
err = skcipher_walk_virt(&walk, req, true);
while (walk.nbytes > 0) {
u8 *dst = walk.dst.virt.addr;
u8 *src = walk.src.virt.addr;
int nbytes = walk.nbytes;
int tail = 0;
if (nbytes < walk.total) {
nbytes = round_down(nbytes, AES_BLOCK_SIZE);
tail = walk.nbytes % AES_BLOCK_SIZE;
}
do {
int bsize = min(nbytes, AES_BLOCK_SIZE);
__aes_arm64_encrypt(ctx->key_enc, buf, walk.iv,
6 + ctx->key_length / 4);
crypto_xor_cpy(dst, src, buf, bsize);
crypto_inc(walk.iv, AES_BLOCK_SIZE);
dst += AES_BLOCK_SIZE;
src += AES_BLOCK_SIZE;
nbytes -= AES_BLOCK_SIZE;
} while (nbytes > 0);
err = skcipher_walk_done(&walk, tail);
}
return err;
}
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