linux/drivers/crypto/vmx/aes_cbc.c
Linus Torvalds 4d2fa8b44b Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
Pull crypto updates from Herbert Xu:
 "Here is the crypto update for 5.3:

  API:
   - Test shash interface directly in testmgr
   - cra_driver_name is now mandatory

  Algorithms:
   - Replace arc4 crypto_cipher with library helper
   - Implement 5 way interleave for ECB, CBC and CTR on arm64
   - Add xxhash
   - Add continuous self-test on noise source to drbg
   - Update jitter RNG

  Drivers:
   - Add support for SHA204A random number generator
   - Add support for 7211 in iproc-rng200
   - Fix fuzz test failures in inside-secure
   - Fix fuzz test failures in talitos
   - Fix fuzz test failures in qat"

* 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (143 commits)
  crypto: stm32/hash - remove interruptible condition for dma
  crypto: stm32/hash - Fix hmac issue more than 256 bytes
  crypto: stm32/crc32 - rename driver file
  crypto: amcc - remove memset after dma_alloc_coherent
  crypto: ccp - Switch to SPDX license identifiers
  crypto: ccp - Validate the the error value used to index error messages
  crypto: doc - Fix formatting of new crypto engine content
  crypto: doc - Add parameter documentation
  crypto: arm64/aes-ce - implement 5 way interleave for ECB, CBC and CTR
  crypto: arm64/aes-ce - add 5 way interleave routines
  crypto: talitos - drop icv_ool
  crypto: talitos - fix hash on SEC1.
  crypto: talitos - move struct talitos_edesc into talitos.h
  lib/scatterlist: Fix mapping iterator when sg->offset is greater than PAGE_SIZE
  crypto/NX: Set receive window credits to max number of CRBs in RxFIFO
  crypto: asymmetric_keys - select CRYPTO_HASH where needed
  crypto: serpent - mark __serpent_setkey_sbox noinline
  crypto: testmgr - dynamically allocate crypto_shash
  crypto: testmgr - dynamically allocate testvec_config
  crypto: talitos - eliminate unneeded 'done' functions at build time
  ...
2019-07-08 20:57:08 -07:00

134 lines
3.4 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/**
* AES CBC routines supporting VMX instructions on the Power 8
*
* Copyright (C) 2015 International Business Machines Inc.
*
* Author: Marcelo Henrique Cerri <mhcerri@br.ibm.com>
*/
#include <asm/simd.h>
#include <asm/switch_to.h>
#include <crypto/aes.h>
#include <crypto/internal/simd.h>
#include <crypto/internal/skcipher.h>
#include "aesp8-ppc.h"
struct p8_aes_cbc_ctx {
struct crypto_skcipher *fallback;
struct aes_key enc_key;
struct aes_key dec_key;
};
static int p8_aes_cbc_init(struct crypto_skcipher *tfm)
{
struct p8_aes_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
struct crypto_skcipher *fallback;
fallback = crypto_alloc_skcipher("cbc(aes)", 0,
CRYPTO_ALG_NEED_FALLBACK |
CRYPTO_ALG_ASYNC);
if (IS_ERR(fallback)) {
pr_err("Failed to allocate cbc(aes) fallback: %ld\n",
PTR_ERR(fallback));
return PTR_ERR(fallback);
}
crypto_skcipher_set_reqsize(tfm, sizeof(struct skcipher_request) +
crypto_skcipher_reqsize(fallback));
ctx->fallback = fallback;
return 0;
}
static void p8_aes_cbc_exit(struct crypto_skcipher *tfm)
{
struct p8_aes_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
crypto_free_skcipher(ctx->fallback);
}
static int p8_aes_cbc_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int keylen)
{
struct p8_aes_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
int ret;
preempt_disable();
pagefault_disable();
enable_kernel_vsx();
ret = aes_p8_set_encrypt_key(key, keylen * 8, &ctx->enc_key);
ret |= aes_p8_set_decrypt_key(key, keylen * 8, &ctx->dec_key);
disable_kernel_vsx();
pagefault_enable();
preempt_enable();
ret |= crypto_skcipher_setkey(ctx->fallback, key, keylen);
return ret ? -EINVAL : 0;
}
static int p8_aes_cbc_crypt(struct skcipher_request *req, int enc)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
const struct p8_aes_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
struct skcipher_walk walk;
unsigned int nbytes;
int ret;
if (!crypto_simd_usable()) {
struct skcipher_request *subreq = skcipher_request_ctx(req);
*subreq = *req;
skcipher_request_set_tfm(subreq, ctx->fallback);
return enc ? crypto_skcipher_encrypt(subreq) :
crypto_skcipher_decrypt(subreq);
}
ret = skcipher_walk_virt(&walk, req, false);
while ((nbytes = walk.nbytes) != 0) {
preempt_disable();
pagefault_disable();
enable_kernel_vsx();
aes_p8_cbc_encrypt(walk.src.virt.addr,
walk.dst.virt.addr,
round_down(nbytes, AES_BLOCK_SIZE),
enc ? &ctx->enc_key : &ctx->dec_key,
walk.iv, enc);
disable_kernel_vsx();
pagefault_enable();
preempt_enable();
ret = skcipher_walk_done(&walk, nbytes % AES_BLOCK_SIZE);
}
return ret;
}
static int p8_aes_cbc_encrypt(struct skcipher_request *req)
{
return p8_aes_cbc_crypt(req, 1);
}
static int p8_aes_cbc_decrypt(struct skcipher_request *req)
{
return p8_aes_cbc_crypt(req, 0);
}
struct skcipher_alg p8_aes_cbc_alg = {
.base.cra_name = "cbc(aes)",
.base.cra_driver_name = "p8_aes_cbc",
.base.cra_module = THIS_MODULE,
.base.cra_priority = 2000,
.base.cra_flags = CRYPTO_ALG_NEED_FALLBACK,
.base.cra_blocksize = AES_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct p8_aes_cbc_ctx),
.setkey = p8_aes_cbc_setkey,
.encrypt = p8_aes_cbc_encrypt,
.decrypt = p8_aes_cbc_decrypt,
.init = p8_aes_cbc_init,
.exit = p8_aes_cbc_exit,
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.ivsize = AES_BLOCK_SIZE,
};