448 lines
12 KiB
C
448 lines
12 KiB
C
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/*
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* linux/arch/arm/crypto/aesbs-glue.c - glue code for NEON bit sliced AES
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*
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* Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <asm/neon.h>
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#include <crypto/aes.h>
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#include <crypto/ablk_helper.h>
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#include <crypto/algapi.h>
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#include <linux/module.h>
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#include <crypto/xts.h>
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#include "aes_glue.h"
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#define BIT_SLICED_KEY_MAXSIZE (128 * (AES_MAXNR - 1) + 2 * AES_BLOCK_SIZE)
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struct BS_KEY {
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struct AES_KEY rk;
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int converted;
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u8 __aligned(8) bs[BIT_SLICED_KEY_MAXSIZE];
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} __aligned(8);
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asmlinkage void bsaes_enc_key_convert(u8 out[], struct AES_KEY const *in);
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asmlinkage void bsaes_dec_key_convert(u8 out[], struct AES_KEY const *in);
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asmlinkage void bsaes_cbc_encrypt(u8 const in[], u8 out[], u32 bytes,
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struct BS_KEY *key, u8 iv[]);
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asmlinkage void bsaes_ctr32_encrypt_blocks(u8 const in[], u8 out[], u32 blocks,
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struct BS_KEY *key, u8 const iv[]);
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asmlinkage void bsaes_xts_encrypt(u8 const in[], u8 out[], u32 bytes,
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struct BS_KEY *key, u8 tweak[]);
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asmlinkage void bsaes_xts_decrypt(u8 const in[], u8 out[], u32 bytes,
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struct BS_KEY *key, u8 tweak[]);
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struct aesbs_cbc_ctx {
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struct AES_KEY enc;
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struct BS_KEY dec;
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};
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struct aesbs_ctr_ctx {
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struct BS_KEY enc;
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};
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struct aesbs_xts_ctx {
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struct BS_KEY enc;
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struct BS_KEY dec;
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struct AES_KEY twkey;
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};
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static int aesbs_cbc_set_key(struct crypto_tfm *tfm, const u8 *in_key,
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unsigned int key_len)
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{
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struct aesbs_cbc_ctx *ctx = crypto_tfm_ctx(tfm);
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int bits = key_len * 8;
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if (private_AES_set_encrypt_key(in_key, bits, &ctx->enc)) {
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tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
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return -EINVAL;
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}
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ctx->dec.rk = ctx->enc;
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private_AES_set_decrypt_key(in_key, bits, &ctx->dec.rk);
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ctx->dec.converted = 0;
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return 0;
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}
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static int aesbs_ctr_set_key(struct crypto_tfm *tfm, const u8 *in_key,
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unsigned int key_len)
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{
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struct aesbs_ctr_ctx *ctx = crypto_tfm_ctx(tfm);
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int bits = key_len * 8;
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if (private_AES_set_encrypt_key(in_key, bits, &ctx->enc.rk)) {
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tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
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return -EINVAL;
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}
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ctx->enc.converted = 0;
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return 0;
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}
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static int aesbs_xts_set_key(struct crypto_tfm *tfm, const u8 *in_key,
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unsigned int key_len)
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{
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struct aesbs_xts_ctx *ctx = crypto_tfm_ctx(tfm);
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int bits = key_len * 4;
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int err;
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err = xts_check_key(tfm, in_key, key_len);
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if (err)
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return err;
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if (private_AES_set_encrypt_key(in_key, bits, &ctx->enc.rk)) {
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tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
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return -EINVAL;
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}
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ctx->dec.rk = ctx->enc.rk;
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private_AES_set_decrypt_key(in_key, bits, &ctx->dec.rk);
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private_AES_set_encrypt_key(in_key + key_len / 2, bits, &ctx->twkey);
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ctx->enc.converted = ctx->dec.converted = 0;
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return 0;
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}
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static int aesbs_cbc_encrypt(struct blkcipher_desc *desc,
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struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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struct aesbs_cbc_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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struct blkcipher_walk walk;
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int err;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt(desc, &walk);
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while (walk.nbytes) {
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u32 blocks = walk.nbytes / AES_BLOCK_SIZE;
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u8 *src = walk.src.virt.addr;
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if (walk.dst.virt.addr == walk.src.virt.addr) {
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u8 *iv = walk.iv;
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do {
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crypto_xor(src, iv, AES_BLOCK_SIZE);
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AES_encrypt(src, src, &ctx->enc);
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iv = src;
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src += AES_BLOCK_SIZE;
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} while (--blocks);
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memcpy(walk.iv, iv, AES_BLOCK_SIZE);
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} else {
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u8 *dst = walk.dst.virt.addr;
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do {
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crypto_xor(walk.iv, src, AES_BLOCK_SIZE);
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AES_encrypt(walk.iv, dst, &ctx->enc);
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memcpy(walk.iv, dst, AES_BLOCK_SIZE);
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src += AES_BLOCK_SIZE;
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dst += AES_BLOCK_SIZE;
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} while (--blocks);
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}
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err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
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}
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return err;
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}
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static int aesbs_cbc_decrypt(struct blkcipher_desc *desc,
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struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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struct aesbs_cbc_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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struct blkcipher_walk walk;
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int err;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt_block(desc, &walk, 8 * AES_BLOCK_SIZE);
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while ((walk.nbytes / AES_BLOCK_SIZE) >= 8) {
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kernel_neon_begin();
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bsaes_cbc_encrypt(walk.src.virt.addr, walk.dst.virt.addr,
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walk.nbytes, &ctx->dec, walk.iv);
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kernel_neon_end();
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err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
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}
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while (walk.nbytes) {
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u32 blocks = walk.nbytes / AES_BLOCK_SIZE;
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u8 *dst = walk.dst.virt.addr;
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u8 *src = walk.src.virt.addr;
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u8 bk[2][AES_BLOCK_SIZE];
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u8 *iv = walk.iv;
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do {
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if (walk.dst.virt.addr == walk.src.virt.addr)
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memcpy(bk[blocks & 1], src, AES_BLOCK_SIZE);
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AES_decrypt(src, dst, &ctx->dec.rk);
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crypto_xor(dst, iv, AES_BLOCK_SIZE);
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if (walk.dst.virt.addr == walk.src.virt.addr)
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iv = bk[blocks & 1];
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else
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iv = src;
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dst += AES_BLOCK_SIZE;
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src += AES_BLOCK_SIZE;
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} while (--blocks);
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err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
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}
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return err;
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}
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static void inc_be128_ctr(__be32 ctr[], u32 addend)
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{
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int i;
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for (i = 3; i >= 0; i--, addend = 1) {
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u32 n = be32_to_cpu(ctr[i]) + addend;
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ctr[i] = cpu_to_be32(n);
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if (n >= addend)
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break;
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}
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}
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static int aesbs_ctr_encrypt(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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struct aesbs_ctr_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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struct blkcipher_walk walk;
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u32 blocks;
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int err;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt_block(desc, &walk, 8 * AES_BLOCK_SIZE);
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while ((blocks = walk.nbytes / AES_BLOCK_SIZE)) {
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u32 tail = walk.nbytes % AES_BLOCK_SIZE;
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__be32 *ctr = (__be32 *)walk.iv;
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u32 headroom = UINT_MAX - be32_to_cpu(ctr[3]);
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/* avoid 32 bit counter overflow in the NEON code */
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if (unlikely(headroom < blocks)) {
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blocks = headroom + 1;
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tail = walk.nbytes - blocks * AES_BLOCK_SIZE;
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}
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kernel_neon_begin();
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bsaes_ctr32_encrypt_blocks(walk.src.virt.addr,
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walk.dst.virt.addr, blocks,
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&ctx->enc, walk.iv);
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kernel_neon_end();
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inc_be128_ctr(ctr, blocks);
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nbytes -= blocks * AES_BLOCK_SIZE;
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if (nbytes && nbytes == tail && nbytes <= AES_BLOCK_SIZE)
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break;
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err = blkcipher_walk_done(desc, &walk, tail);
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}
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if (walk.nbytes) {
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u8 *tdst = walk.dst.virt.addr + blocks * AES_BLOCK_SIZE;
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u8 *tsrc = walk.src.virt.addr + blocks * AES_BLOCK_SIZE;
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u8 ks[AES_BLOCK_SIZE];
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AES_encrypt(walk.iv, ks, &ctx->enc.rk);
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if (tdst != tsrc)
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memcpy(tdst, tsrc, nbytes);
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crypto_xor(tdst, ks, nbytes);
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err = blkcipher_walk_done(desc, &walk, 0);
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}
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return err;
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}
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static int aesbs_xts_encrypt(struct blkcipher_desc *desc,
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struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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struct aesbs_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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struct blkcipher_walk walk;
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int err;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt_block(desc, &walk, 8 * AES_BLOCK_SIZE);
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if (err)
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return err;
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/* generate the initial tweak */
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AES_encrypt(walk.iv, walk.iv, &ctx->twkey);
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while (walk.nbytes) {
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kernel_neon_begin();
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bsaes_xts_encrypt(walk.src.virt.addr, walk.dst.virt.addr,
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walk.nbytes, &ctx->enc, walk.iv);
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kernel_neon_end();
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err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
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}
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return err;
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}
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static int aesbs_xts_decrypt(struct blkcipher_desc *desc,
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struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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struct aesbs_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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struct blkcipher_walk walk;
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int err;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt_block(desc, &walk, 8 * AES_BLOCK_SIZE);
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if (err)
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return err;
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/* generate the initial tweak */
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AES_encrypt(walk.iv, walk.iv, &ctx->twkey);
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while (walk.nbytes) {
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kernel_neon_begin();
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bsaes_xts_decrypt(walk.src.virt.addr, walk.dst.virt.addr,
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walk.nbytes, &ctx->dec, walk.iv);
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kernel_neon_end();
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err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
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}
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return err;
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}
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static struct crypto_alg aesbs_algs[] = { {
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.cra_name = "__cbc-aes-neonbs",
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.cra_driver_name = "__driver-cbc-aes-neonbs",
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.cra_priority = 0,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
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CRYPTO_ALG_INTERNAL,
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.cra_blocksize = AES_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct aesbs_cbc_ctx),
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.cra_alignmask = 7,
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_blkcipher = {
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.min_keysize = AES_MIN_KEY_SIZE,
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.max_keysize = AES_MAX_KEY_SIZE,
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.ivsize = AES_BLOCK_SIZE,
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.setkey = aesbs_cbc_set_key,
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.encrypt = aesbs_cbc_encrypt,
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.decrypt = aesbs_cbc_decrypt,
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},
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}, {
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.cra_name = "__ctr-aes-neonbs",
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.cra_driver_name = "__driver-ctr-aes-neonbs",
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.cra_priority = 0,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
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CRYPTO_ALG_INTERNAL,
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.cra_blocksize = 1,
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.cra_ctxsize = sizeof(struct aesbs_ctr_ctx),
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.cra_alignmask = 7,
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_blkcipher = {
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.min_keysize = AES_MIN_KEY_SIZE,
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.max_keysize = AES_MAX_KEY_SIZE,
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.ivsize = AES_BLOCK_SIZE,
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.setkey = aesbs_ctr_set_key,
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.encrypt = aesbs_ctr_encrypt,
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.decrypt = aesbs_ctr_encrypt,
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},
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}, {
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.cra_name = "__xts-aes-neonbs",
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.cra_driver_name = "__driver-xts-aes-neonbs",
|
||
|
|
.cra_priority = 0,
|
||
|
|
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
|
||
|
|
CRYPTO_ALG_INTERNAL,
|
||
|
|
.cra_blocksize = AES_BLOCK_SIZE,
|
||
|
|
.cra_ctxsize = sizeof(struct aesbs_xts_ctx),
|
||
|
|
.cra_alignmask = 7,
|
||
|
|
.cra_type = &crypto_blkcipher_type,
|
||
|
|
.cra_module = THIS_MODULE,
|
||
|
|
.cra_blkcipher = {
|
||
|
|
.min_keysize = 2 * AES_MIN_KEY_SIZE,
|
||
|
|
.max_keysize = 2 * AES_MAX_KEY_SIZE,
|
||
|
|
.ivsize = AES_BLOCK_SIZE,
|
||
|
|
.setkey = aesbs_xts_set_key,
|
||
|
|
.encrypt = aesbs_xts_encrypt,
|
||
|
|
.decrypt = aesbs_xts_decrypt,
|
||
|
|
},
|
||
|
|
}, {
|
||
|
|
.cra_name = "cbc(aes)",
|
||
|
|
.cra_driver_name = "cbc-aes-neonbs",
|
||
|
|
.cra_priority = 250,
|
||
|
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
|
||
|
|
.cra_blocksize = AES_BLOCK_SIZE,
|
||
|
|
.cra_ctxsize = sizeof(struct async_helper_ctx),
|
||
|
|
.cra_alignmask = 7,
|
||
|
|
.cra_type = &crypto_ablkcipher_type,
|
||
|
|
.cra_module = THIS_MODULE,
|
||
|
|
.cra_init = ablk_init,
|
||
|
|
.cra_exit = ablk_exit,
|
||
|
|
.cra_ablkcipher = {
|
||
|
|
.min_keysize = AES_MIN_KEY_SIZE,
|
||
|
|
.max_keysize = AES_MAX_KEY_SIZE,
|
||
|
|
.ivsize = AES_BLOCK_SIZE,
|
||
|
|
.setkey = ablk_set_key,
|
||
|
|
.encrypt = __ablk_encrypt,
|
||
|
|
.decrypt = ablk_decrypt,
|
||
|
|
}
|
||
|
|
}, {
|
||
|
|
.cra_name = "ctr(aes)",
|
||
|
|
.cra_driver_name = "ctr-aes-neonbs",
|
||
|
|
.cra_priority = 250,
|
||
|
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
|
||
|
|
.cra_blocksize = 1,
|
||
|
|
.cra_ctxsize = sizeof(struct async_helper_ctx),
|
||
|
|
.cra_alignmask = 7,
|
||
|
|
.cra_type = &crypto_ablkcipher_type,
|
||
|
|
.cra_module = THIS_MODULE,
|
||
|
|
.cra_init = ablk_init,
|
||
|
|
.cra_exit = ablk_exit,
|
||
|
|
.cra_ablkcipher = {
|
||
|
|
.min_keysize = AES_MIN_KEY_SIZE,
|
||
|
|
.max_keysize = AES_MAX_KEY_SIZE,
|
||
|
|
.ivsize = AES_BLOCK_SIZE,
|
||
|
|
.setkey = ablk_set_key,
|
||
|
|
.encrypt = ablk_encrypt,
|
||
|
|
.decrypt = ablk_decrypt,
|
||
|
|
}
|
||
|
|
}, {
|
||
|
|
.cra_name = "xts(aes)",
|
||
|
|
.cra_driver_name = "xts-aes-neonbs",
|
||
|
|
.cra_priority = 250,
|
||
|
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
|
||
|
|
.cra_blocksize = AES_BLOCK_SIZE,
|
||
|
|
.cra_ctxsize = sizeof(struct async_helper_ctx),
|
||
|
|
.cra_alignmask = 7,
|
||
|
|
.cra_type = &crypto_ablkcipher_type,
|
||
|
|
.cra_module = THIS_MODULE,
|
||
|
|
.cra_init = ablk_init,
|
||
|
|
.cra_exit = ablk_exit,
|
||
|
|
.cra_ablkcipher = {
|
||
|
|
.min_keysize = 2 * AES_MIN_KEY_SIZE,
|
||
|
|
.max_keysize = 2 * AES_MAX_KEY_SIZE,
|
||
|
|
.ivsize = AES_BLOCK_SIZE,
|
||
|
|
.setkey = ablk_set_key,
|
||
|
|
.encrypt = ablk_encrypt,
|
||
|
|
.decrypt = ablk_decrypt,
|
||
|
|
}
|
||
|
|
} };
|
||
|
|
|
||
|
|
static int __init aesbs_mod_init(void)
|
||
|
|
{
|
||
|
|
if (!cpu_has_neon())
|
||
|
|
return -ENODEV;
|
||
|
|
|
||
|
|
return crypto_register_algs(aesbs_algs, ARRAY_SIZE(aesbs_algs));
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __exit aesbs_mod_exit(void)
|
||
|
|
{
|
||
|
|
crypto_unregister_algs(aesbs_algs, ARRAY_SIZE(aesbs_algs));
|
||
|
|
}
|
||
|
|
|
||
|
|
module_init(aesbs_mod_init);
|
||
|
|
module_exit(aesbs_mod_exit);
|
||
|
|
|
||
|
|
MODULE_DESCRIPTION("Bit sliced AES in CBC/CTR/XTS modes using NEON");
|
||
|
|
MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
|
||
|
|
MODULE_LICENSE("GPL");
|