/* * 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; }