![Harald Freudenberger](/assets/img/avatar_default.png)
Tests with paes-xts and debugging investigations showed that the ciphers are not always correctly resolved. The rules for cipher priorities seem to be: - Ecb-aes should have a prio greater than the generic ecb-aes. - The mode specialized ciphers (like cbc-aes-s390) should have a prio greater than the sum of the more generic combinations (like cbs(aes)). This patch adjusts the cipher priorities for the s390 aes and paes in kernel crypto implementations. Signed-off-by: Harald Freudenberger <freude@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
1144 lines
30 KiB
C
1144 lines
30 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Cryptographic API.
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*
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* s390 implementation of the AES Cipher Algorithm.
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*
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* s390 Version:
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* Copyright IBM Corp. 2005, 2017
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* Author(s): Jan Glauber (jang@de.ibm.com)
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* Sebastian Siewior (sebastian@breakpoint.cc> SW-Fallback
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* Patrick Steuer <patrick.steuer@de.ibm.com>
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* Harald Freudenberger <freude@de.ibm.com>
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*
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* Derived from "crypto/aes_generic.c"
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*/
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#define KMSG_COMPONENT "aes_s390"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <crypto/aes.h>
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#include <crypto/algapi.h>
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#include <crypto/ghash.h>
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#include <crypto/internal/aead.h>
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#include <crypto/internal/skcipher.h>
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#include <crypto/scatterwalk.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/cpufeature.h>
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include <linux/fips.h>
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#include <linux/string.h>
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#include <crypto/xts.h>
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#include <asm/cpacf.h>
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static u8 *ctrblk;
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static DEFINE_SPINLOCK(ctrblk_lock);
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static cpacf_mask_t km_functions, kmc_functions, kmctr_functions,
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kma_functions;
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struct s390_aes_ctx {
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u8 key[AES_MAX_KEY_SIZE];
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int key_len;
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unsigned long fc;
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union {
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struct crypto_skcipher *blk;
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struct crypto_cipher *cip;
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} fallback;
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};
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struct s390_xts_ctx {
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u8 key[32];
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u8 pcc_key[32];
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int key_len;
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unsigned long fc;
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struct crypto_skcipher *fallback;
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};
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struct gcm_sg_walk {
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struct scatter_walk walk;
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unsigned int walk_bytes;
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u8 *walk_ptr;
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unsigned int walk_bytes_remain;
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u8 buf[AES_BLOCK_SIZE];
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unsigned int buf_bytes;
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u8 *ptr;
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unsigned int nbytes;
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};
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static int setkey_fallback_cip(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 s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
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int ret;
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sctx->fallback.cip->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
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sctx->fallback.cip->base.crt_flags |= (tfm->crt_flags &
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CRYPTO_TFM_REQ_MASK);
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ret = crypto_cipher_setkey(sctx->fallback.cip, in_key, key_len);
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if (ret) {
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tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
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tfm->crt_flags |= (sctx->fallback.cip->base.crt_flags &
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CRYPTO_TFM_RES_MASK);
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}
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return ret;
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}
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static int aes_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 s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
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unsigned long fc;
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/* Pick the correct function code based on the key length */
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fc = (key_len == 16) ? CPACF_KM_AES_128 :
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(key_len == 24) ? CPACF_KM_AES_192 :
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(key_len == 32) ? CPACF_KM_AES_256 : 0;
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/* Check if the function code is available */
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sctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
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if (!sctx->fc)
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return setkey_fallback_cip(tfm, in_key, key_len);
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sctx->key_len = key_len;
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memcpy(sctx->key, in_key, key_len);
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return 0;
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}
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static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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{
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struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
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if (unlikely(!sctx->fc)) {
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crypto_cipher_encrypt_one(sctx->fallback.cip, out, in);
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return;
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}
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cpacf_km(sctx->fc, &sctx->key, out, in, AES_BLOCK_SIZE);
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}
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static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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{
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struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
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if (unlikely(!sctx->fc)) {
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crypto_cipher_decrypt_one(sctx->fallback.cip, out, in);
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return;
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}
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cpacf_km(sctx->fc | CPACF_DECRYPT,
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&sctx->key, out, in, AES_BLOCK_SIZE);
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}
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static int fallback_init_cip(struct crypto_tfm *tfm)
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{
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const char *name = tfm->__crt_alg->cra_name;
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struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
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sctx->fallback.cip = crypto_alloc_cipher(name, 0,
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CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
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if (IS_ERR(sctx->fallback.cip)) {
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pr_err("Allocating AES fallback algorithm %s failed\n",
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name);
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return PTR_ERR(sctx->fallback.cip);
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}
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return 0;
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}
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static void fallback_exit_cip(struct crypto_tfm *tfm)
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{
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struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
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crypto_free_cipher(sctx->fallback.cip);
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sctx->fallback.cip = NULL;
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}
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static struct crypto_alg aes_alg = {
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.cra_name = "aes",
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.cra_driver_name = "aes-s390",
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.cra_priority = 300,
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.cra_flags = CRYPTO_ALG_TYPE_CIPHER |
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CRYPTO_ALG_NEED_FALLBACK,
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.cra_blocksize = AES_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct s390_aes_ctx),
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.cra_module = THIS_MODULE,
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.cra_init = fallback_init_cip,
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.cra_exit = fallback_exit_cip,
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.cra_u = {
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.cipher = {
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.cia_min_keysize = AES_MIN_KEY_SIZE,
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.cia_max_keysize = AES_MAX_KEY_SIZE,
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.cia_setkey = aes_set_key,
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.cia_encrypt = aes_encrypt,
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.cia_decrypt = aes_decrypt,
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}
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}
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};
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static int setkey_fallback_blk(struct crypto_tfm *tfm, const u8 *key,
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unsigned int len)
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{
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struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
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unsigned int ret;
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crypto_skcipher_clear_flags(sctx->fallback.blk, CRYPTO_TFM_REQ_MASK);
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crypto_skcipher_set_flags(sctx->fallback.blk, tfm->crt_flags &
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CRYPTO_TFM_REQ_MASK);
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ret = crypto_skcipher_setkey(sctx->fallback.blk, key, len);
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tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
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tfm->crt_flags |= crypto_skcipher_get_flags(sctx->fallback.blk) &
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CRYPTO_TFM_RES_MASK;
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return ret;
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}
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static int fallback_blk_dec(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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unsigned int ret;
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struct crypto_blkcipher *tfm = desc->tfm;
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struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(tfm);
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SKCIPHER_REQUEST_ON_STACK(req, sctx->fallback.blk);
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skcipher_request_set_tfm(req, sctx->fallback.blk);
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skcipher_request_set_callback(req, desc->flags, NULL, NULL);
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skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
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ret = crypto_skcipher_decrypt(req);
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skcipher_request_zero(req);
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return ret;
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}
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static int fallback_blk_enc(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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unsigned int ret;
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struct crypto_blkcipher *tfm = desc->tfm;
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struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(tfm);
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SKCIPHER_REQUEST_ON_STACK(req, sctx->fallback.blk);
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skcipher_request_set_tfm(req, sctx->fallback.blk);
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skcipher_request_set_callback(req, desc->flags, NULL, NULL);
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skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
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ret = crypto_skcipher_encrypt(req);
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return ret;
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}
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static int ecb_aes_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 s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
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unsigned long fc;
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/* Pick the correct function code based on the key length */
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fc = (key_len == 16) ? CPACF_KM_AES_128 :
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(key_len == 24) ? CPACF_KM_AES_192 :
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(key_len == 32) ? CPACF_KM_AES_256 : 0;
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/* Check if the function code is available */
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sctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
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if (!sctx->fc)
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return setkey_fallback_blk(tfm, in_key, key_len);
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sctx->key_len = key_len;
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memcpy(sctx->key, in_key, key_len);
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return 0;
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}
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static int ecb_aes_crypt(struct blkcipher_desc *desc, unsigned long modifier,
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struct blkcipher_walk *walk)
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{
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struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
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unsigned int nbytes, n;
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int ret;
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ret = blkcipher_walk_virt(desc, walk);
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while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {
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/* only use complete blocks */
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n = nbytes & ~(AES_BLOCK_SIZE - 1);
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cpacf_km(sctx->fc | modifier, sctx->key,
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walk->dst.virt.addr, walk->src.virt.addr, n);
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ret = blkcipher_walk_done(desc, walk, nbytes - n);
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}
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return ret;
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}
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static int ecb_aes_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 s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
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struct blkcipher_walk walk;
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if (unlikely(!sctx->fc))
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return fallback_blk_enc(desc, dst, src, nbytes);
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blkcipher_walk_init(&walk, dst, src, nbytes);
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return ecb_aes_crypt(desc, 0, &walk);
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}
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static int ecb_aes_decrypt(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 s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
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struct blkcipher_walk walk;
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if (unlikely(!sctx->fc))
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return fallback_blk_dec(desc, dst, src, nbytes);
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blkcipher_walk_init(&walk, dst, src, nbytes);
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return ecb_aes_crypt(desc, CPACF_DECRYPT, &walk);
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}
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static int fallback_init_blk(struct crypto_tfm *tfm)
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{
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const char *name = tfm->__crt_alg->cra_name;
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struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
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sctx->fallback.blk = crypto_alloc_skcipher(name, 0,
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CRYPTO_ALG_ASYNC |
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CRYPTO_ALG_NEED_FALLBACK);
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if (IS_ERR(sctx->fallback.blk)) {
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pr_err("Allocating AES fallback algorithm %s failed\n",
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name);
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return PTR_ERR(sctx->fallback.blk);
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}
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return 0;
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}
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static void fallback_exit_blk(struct crypto_tfm *tfm)
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{
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struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
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crypto_free_skcipher(sctx->fallback.blk);
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}
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static struct crypto_alg ecb_aes_alg = {
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.cra_name = "ecb(aes)",
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.cra_driver_name = "ecb-aes-s390",
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.cra_priority = 401, /* combo: aes + ecb + 1 */
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
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CRYPTO_ALG_NEED_FALLBACK,
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.cra_blocksize = AES_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct s390_aes_ctx),
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_init = fallback_init_blk,
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.cra_exit = fallback_exit_blk,
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.cra_u = {
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.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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.setkey = ecb_aes_set_key,
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.encrypt = ecb_aes_encrypt,
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.decrypt = ecb_aes_decrypt,
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}
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}
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};
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static int cbc_aes_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 s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
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unsigned long fc;
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/* Pick the correct function code based on the key length */
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fc = (key_len == 16) ? CPACF_KMC_AES_128 :
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(key_len == 24) ? CPACF_KMC_AES_192 :
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(key_len == 32) ? CPACF_KMC_AES_256 : 0;
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/* Check if the function code is available */
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sctx->fc = (fc && cpacf_test_func(&kmc_functions, fc)) ? fc : 0;
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if (!sctx->fc)
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return setkey_fallback_blk(tfm, in_key, key_len);
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sctx->key_len = key_len;
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memcpy(sctx->key, in_key, key_len);
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return 0;
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}
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static int cbc_aes_crypt(struct blkcipher_desc *desc, unsigned long modifier,
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struct blkcipher_walk *walk)
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{
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struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
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unsigned int nbytes, n;
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int ret;
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struct {
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u8 iv[AES_BLOCK_SIZE];
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u8 key[AES_MAX_KEY_SIZE];
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} param;
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ret = blkcipher_walk_virt(desc, walk);
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memcpy(param.iv, walk->iv, AES_BLOCK_SIZE);
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memcpy(param.key, sctx->key, sctx->key_len);
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while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {
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/* only use complete blocks */
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n = nbytes & ~(AES_BLOCK_SIZE - 1);
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cpacf_kmc(sctx->fc | modifier, ¶m,
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walk->dst.virt.addr, walk->src.virt.addr, n);
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ret = blkcipher_walk_done(desc, walk, nbytes - n);
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}
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memcpy(walk->iv, param.iv, AES_BLOCK_SIZE);
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return ret;
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}
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static int cbc_aes_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 s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
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struct blkcipher_walk walk;
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if (unlikely(!sctx->fc))
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return fallback_blk_enc(desc, dst, src, nbytes);
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blkcipher_walk_init(&walk, dst, src, nbytes);
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return cbc_aes_crypt(desc, 0, &walk);
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}
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static int cbc_aes_decrypt(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 s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
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struct blkcipher_walk walk;
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if (unlikely(!sctx->fc))
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return fallback_blk_dec(desc, dst, src, nbytes);
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blkcipher_walk_init(&walk, dst, src, nbytes);
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return cbc_aes_crypt(desc, CPACF_DECRYPT, &walk);
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}
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static struct crypto_alg cbc_aes_alg = {
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.cra_name = "cbc(aes)",
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.cra_driver_name = "cbc-aes-s390",
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.cra_priority = 402, /* ecb-aes-s390 + 1 */
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
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CRYPTO_ALG_NEED_FALLBACK,
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.cra_blocksize = AES_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct s390_aes_ctx),
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_init = fallback_init_blk,
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.cra_exit = fallback_exit_blk,
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.cra_u = {
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.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 = cbc_aes_set_key,
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.encrypt = cbc_aes_encrypt,
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.decrypt = cbc_aes_decrypt,
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}
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}
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};
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static int xts_fallback_setkey(struct crypto_tfm *tfm, const u8 *key,
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unsigned int len)
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{
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struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
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unsigned int ret;
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crypto_skcipher_clear_flags(xts_ctx->fallback, CRYPTO_TFM_REQ_MASK);
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crypto_skcipher_set_flags(xts_ctx->fallback, tfm->crt_flags &
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CRYPTO_TFM_REQ_MASK);
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ret = crypto_skcipher_setkey(xts_ctx->fallback, key, len);
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|
|
tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
|
|
tfm->crt_flags |= crypto_skcipher_get_flags(xts_ctx->fallback) &
|
|
CRYPTO_TFM_RES_MASK;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int xts_fallback_decrypt(struct blkcipher_desc *desc,
|
|
struct scatterlist *dst, struct scatterlist *src,
|
|
unsigned int nbytes)
|
|
{
|
|
struct crypto_blkcipher *tfm = desc->tfm;
|
|
struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(tfm);
|
|
SKCIPHER_REQUEST_ON_STACK(req, xts_ctx->fallback);
|
|
unsigned int ret;
|
|
|
|
skcipher_request_set_tfm(req, xts_ctx->fallback);
|
|
skcipher_request_set_callback(req, desc->flags, NULL, NULL);
|
|
skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
|
|
|
|
ret = crypto_skcipher_decrypt(req);
|
|
|
|
skcipher_request_zero(req);
|
|
return ret;
|
|
}
|
|
|
|
static int xts_fallback_encrypt(struct blkcipher_desc *desc,
|
|
struct scatterlist *dst, struct scatterlist *src,
|
|
unsigned int nbytes)
|
|
{
|
|
struct crypto_blkcipher *tfm = desc->tfm;
|
|
struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(tfm);
|
|
SKCIPHER_REQUEST_ON_STACK(req, xts_ctx->fallback);
|
|
unsigned int ret;
|
|
|
|
skcipher_request_set_tfm(req, xts_ctx->fallback);
|
|
skcipher_request_set_callback(req, desc->flags, NULL, NULL);
|
|
skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
|
|
|
|
ret = crypto_skcipher_encrypt(req);
|
|
|
|
skcipher_request_zero(req);
|
|
return ret;
|
|
}
|
|
|
|
static int xts_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
|
|
unsigned int key_len)
|
|
{
|
|
struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
|
|
unsigned long fc;
|
|
int err;
|
|
|
|
err = xts_check_key(tfm, in_key, key_len);
|
|
if (err)
|
|
return err;
|
|
|
|
/* In fips mode only 128 bit or 256 bit keys are valid */
|
|
if (fips_enabled && key_len != 32 && key_len != 64) {
|
|
tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Pick the correct function code based on the key length */
|
|
fc = (key_len == 32) ? CPACF_KM_XTS_128 :
|
|
(key_len == 64) ? CPACF_KM_XTS_256 : 0;
|
|
|
|
/* Check if the function code is available */
|
|
xts_ctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
|
|
if (!xts_ctx->fc)
|
|
return xts_fallback_setkey(tfm, in_key, key_len);
|
|
|
|
/* Split the XTS key into the two subkeys */
|
|
key_len = key_len / 2;
|
|
xts_ctx->key_len = key_len;
|
|
memcpy(xts_ctx->key, in_key, key_len);
|
|
memcpy(xts_ctx->pcc_key, in_key + key_len, key_len);
|
|
return 0;
|
|
}
|
|
|
|
static int xts_aes_crypt(struct blkcipher_desc *desc, unsigned long modifier,
|
|
struct blkcipher_walk *walk)
|
|
{
|
|
struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
|
|
unsigned int offset, nbytes, n;
|
|
int ret;
|
|
struct {
|
|
u8 key[32];
|
|
u8 tweak[16];
|
|
u8 block[16];
|
|
u8 bit[16];
|
|
u8 xts[16];
|
|
} pcc_param;
|
|
struct {
|
|
u8 key[32];
|
|
u8 init[16];
|
|
} xts_param;
|
|
|
|
ret = blkcipher_walk_virt(desc, walk);
|
|
offset = xts_ctx->key_len & 0x10;
|
|
memset(pcc_param.block, 0, sizeof(pcc_param.block));
|
|
memset(pcc_param.bit, 0, sizeof(pcc_param.bit));
|
|
memset(pcc_param.xts, 0, sizeof(pcc_param.xts));
|
|
memcpy(pcc_param.tweak, walk->iv, sizeof(pcc_param.tweak));
|
|
memcpy(pcc_param.key + offset, xts_ctx->pcc_key, xts_ctx->key_len);
|
|
cpacf_pcc(xts_ctx->fc, pcc_param.key + offset);
|
|
|
|
memcpy(xts_param.key + offset, xts_ctx->key, xts_ctx->key_len);
|
|
memcpy(xts_param.init, pcc_param.xts, 16);
|
|
|
|
while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {
|
|
/* only use complete blocks */
|
|
n = nbytes & ~(AES_BLOCK_SIZE - 1);
|
|
cpacf_km(xts_ctx->fc | modifier, xts_param.key + offset,
|
|
walk->dst.virt.addr, walk->src.virt.addr, n);
|
|
ret = blkcipher_walk_done(desc, walk, nbytes - n);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int xts_aes_encrypt(struct blkcipher_desc *desc,
|
|
struct scatterlist *dst, struct scatterlist *src,
|
|
unsigned int nbytes)
|
|
{
|
|
struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
|
|
struct blkcipher_walk walk;
|
|
|
|
if (unlikely(!xts_ctx->fc))
|
|
return xts_fallback_encrypt(desc, dst, src, nbytes);
|
|
|
|
blkcipher_walk_init(&walk, dst, src, nbytes);
|
|
return xts_aes_crypt(desc, 0, &walk);
|
|
}
|
|
|
|
static int xts_aes_decrypt(struct blkcipher_desc *desc,
|
|
struct scatterlist *dst, struct scatterlist *src,
|
|
unsigned int nbytes)
|
|
{
|
|
struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
|
|
struct blkcipher_walk walk;
|
|
|
|
if (unlikely(!xts_ctx->fc))
|
|
return xts_fallback_decrypt(desc, dst, src, nbytes);
|
|
|
|
blkcipher_walk_init(&walk, dst, src, nbytes);
|
|
return xts_aes_crypt(desc, CPACF_DECRYPT, &walk);
|
|
}
|
|
|
|
static int xts_fallback_init(struct crypto_tfm *tfm)
|
|
{
|
|
const char *name = tfm->__crt_alg->cra_name;
|
|
struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
|
|
|
|
xts_ctx->fallback = crypto_alloc_skcipher(name, 0,
|
|
CRYPTO_ALG_ASYNC |
|
|
CRYPTO_ALG_NEED_FALLBACK);
|
|
|
|
if (IS_ERR(xts_ctx->fallback)) {
|
|
pr_err("Allocating XTS fallback algorithm %s failed\n",
|
|
name);
|
|
return PTR_ERR(xts_ctx->fallback);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void xts_fallback_exit(struct crypto_tfm *tfm)
|
|
{
|
|
struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
|
|
|
|
crypto_free_skcipher(xts_ctx->fallback);
|
|
}
|
|
|
|
static struct crypto_alg xts_aes_alg = {
|
|
.cra_name = "xts(aes)",
|
|
.cra_driver_name = "xts-aes-s390",
|
|
.cra_priority = 402, /* ecb-aes-s390 + 1 */
|
|
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
|
|
CRYPTO_ALG_NEED_FALLBACK,
|
|
.cra_blocksize = AES_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(struct s390_xts_ctx),
|
|
.cra_type = &crypto_blkcipher_type,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_init = xts_fallback_init,
|
|
.cra_exit = xts_fallback_exit,
|
|
.cra_u = {
|
|
.blkcipher = {
|
|
.min_keysize = 2 * AES_MIN_KEY_SIZE,
|
|
.max_keysize = 2 * AES_MAX_KEY_SIZE,
|
|
.ivsize = AES_BLOCK_SIZE,
|
|
.setkey = xts_aes_set_key,
|
|
.encrypt = xts_aes_encrypt,
|
|
.decrypt = xts_aes_decrypt,
|
|
}
|
|
}
|
|
};
|
|
|
|
static int ctr_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
|
|
unsigned int key_len)
|
|
{
|
|
struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
|
|
unsigned long fc;
|
|
|
|
/* Pick the correct function code based on the key length */
|
|
fc = (key_len == 16) ? CPACF_KMCTR_AES_128 :
|
|
(key_len == 24) ? CPACF_KMCTR_AES_192 :
|
|
(key_len == 32) ? CPACF_KMCTR_AES_256 : 0;
|
|
|
|
/* Check if the function code is available */
|
|
sctx->fc = (fc && cpacf_test_func(&kmctr_functions, fc)) ? fc : 0;
|
|
if (!sctx->fc)
|
|
return setkey_fallback_blk(tfm, in_key, key_len);
|
|
|
|
sctx->key_len = key_len;
|
|
memcpy(sctx->key, in_key, key_len);
|
|
return 0;
|
|
}
|
|
|
|
static unsigned int __ctrblk_init(u8 *ctrptr, u8 *iv, unsigned int nbytes)
|
|
{
|
|
unsigned int i, n;
|
|
|
|
/* only use complete blocks, max. PAGE_SIZE */
|
|
memcpy(ctrptr, iv, AES_BLOCK_SIZE);
|
|
n = (nbytes > PAGE_SIZE) ? PAGE_SIZE : nbytes & ~(AES_BLOCK_SIZE - 1);
|
|
for (i = (n / AES_BLOCK_SIZE) - 1; i > 0; i--) {
|
|
memcpy(ctrptr + AES_BLOCK_SIZE, ctrptr, AES_BLOCK_SIZE);
|
|
crypto_inc(ctrptr + AES_BLOCK_SIZE, AES_BLOCK_SIZE);
|
|
ctrptr += AES_BLOCK_SIZE;
|
|
}
|
|
return n;
|
|
}
|
|
|
|
static int ctr_aes_crypt(struct blkcipher_desc *desc, unsigned long modifier,
|
|
struct blkcipher_walk *walk)
|
|
{
|
|
struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
|
|
u8 buf[AES_BLOCK_SIZE], *ctrptr;
|
|
unsigned int n, nbytes;
|
|
int ret, locked;
|
|
|
|
locked = spin_trylock(&ctrblk_lock);
|
|
|
|
ret = blkcipher_walk_virt_block(desc, walk, AES_BLOCK_SIZE);
|
|
while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {
|
|
n = AES_BLOCK_SIZE;
|
|
if (nbytes >= 2*AES_BLOCK_SIZE && locked)
|
|
n = __ctrblk_init(ctrblk, walk->iv, nbytes);
|
|
ctrptr = (n > AES_BLOCK_SIZE) ? ctrblk : walk->iv;
|
|
cpacf_kmctr(sctx->fc | modifier, sctx->key,
|
|
walk->dst.virt.addr, walk->src.virt.addr,
|
|
n, ctrptr);
|
|
if (ctrptr == ctrblk)
|
|
memcpy(walk->iv, ctrptr + n - AES_BLOCK_SIZE,
|
|
AES_BLOCK_SIZE);
|
|
crypto_inc(walk->iv, AES_BLOCK_SIZE);
|
|
ret = blkcipher_walk_done(desc, walk, nbytes - n);
|
|
}
|
|
if (locked)
|
|
spin_unlock(&ctrblk_lock);
|
|
/*
|
|
* final block may be < AES_BLOCK_SIZE, copy only nbytes
|
|
*/
|
|
if (nbytes) {
|
|
cpacf_kmctr(sctx->fc | modifier, sctx->key,
|
|
buf, walk->src.virt.addr,
|
|
AES_BLOCK_SIZE, walk->iv);
|
|
memcpy(walk->dst.virt.addr, buf, nbytes);
|
|
crypto_inc(walk->iv, AES_BLOCK_SIZE);
|
|
ret = blkcipher_walk_done(desc, walk, 0);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ctr_aes_encrypt(struct blkcipher_desc *desc,
|
|
struct scatterlist *dst, struct scatterlist *src,
|
|
unsigned int nbytes)
|
|
{
|
|
struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
|
|
struct blkcipher_walk walk;
|
|
|
|
if (unlikely(!sctx->fc))
|
|
return fallback_blk_enc(desc, dst, src, nbytes);
|
|
|
|
blkcipher_walk_init(&walk, dst, src, nbytes);
|
|
return ctr_aes_crypt(desc, 0, &walk);
|
|
}
|
|
|
|
static int ctr_aes_decrypt(struct blkcipher_desc *desc,
|
|
struct scatterlist *dst, struct scatterlist *src,
|
|
unsigned int nbytes)
|
|
{
|
|
struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
|
|
struct blkcipher_walk walk;
|
|
|
|
if (unlikely(!sctx->fc))
|
|
return fallback_blk_dec(desc, dst, src, nbytes);
|
|
|
|
blkcipher_walk_init(&walk, dst, src, nbytes);
|
|
return ctr_aes_crypt(desc, CPACF_DECRYPT, &walk);
|
|
}
|
|
|
|
static struct crypto_alg ctr_aes_alg = {
|
|
.cra_name = "ctr(aes)",
|
|
.cra_driver_name = "ctr-aes-s390",
|
|
.cra_priority = 402, /* ecb-aes-s390 + 1 */
|
|
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
|
|
CRYPTO_ALG_NEED_FALLBACK,
|
|
.cra_blocksize = 1,
|
|
.cra_ctxsize = sizeof(struct s390_aes_ctx),
|
|
.cra_type = &crypto_blkcipher_type,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_init = fallback_init_blk,
|
|
.cra_exit = fallback_exit_blk,
|
|
.cra_u = {
|
|
.blkcipher = {
|
|
.min_keysize = AES_MIN_KEY_SIZE,
|
|
.max_keysize = AES_MAX_KEY_SIZE,
|
|
.ivsize = AES_BLOCK_SIZE,
|
|
.setkey = ctr_aes_set_key,
|
|
.encrypt = ctr_aes_encrypt,
|
|
.decrypt = ctr_aes_decrypt,
|
|
}
|
|
}
|
|
};
|
|
|
|
static int gcm_aes_setkey(struct crypto_aead *tfm, const u8 *key,
|
|
unsigned int keylen)
|
|
{
|
|
struct s390_aes_ctx *ctx = crypto_aead_ctx(tfm);
|
|
|
|
switch (keylen) {
|
|
case AES_KEYSIZE_128:
|
|
ctx->fc = CPACF_KMA_GCM_AES_128;
|
|
break;
|
|
case AES_KEYSIZE_192:
|
|
ctx->fc = CPACF_KMA_GCM_AES_192;
|
|
break;
|
|
case AES_KEYSIZE_256:
|
|
ctx->fc = CPACF_KMA_GCM_AES_256;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
memcpy(ctx->key, key, keylen);
|
|
ctx->key_len = keylen;
|
|
return 0;
|
|
}
|
|
|
|
static int gcm_aes_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
|
|
{
|
|
switch (authsize) {
|
|
case 4:
|
|
case 8:
|
|
case 12:
|
|
case 13:
|
|
case 14:
|
|
case 15:
|
|
case 16:
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void gcm_sg_walk_start(struct gcm_sg_walk *gw, struct scatterlist *sg,
|
|
unsigned int len)
|
|
{
|
|
memset(gw, 0, sizeof(*gw));
|
|
gw->walk_bytes_remain = len;
|
|
scatterwalk_start(&gw->walk, sg);
|
|
}
|
|
|
|
static int gcm_sg_walk_go(struct gcm_sg_walk *gw, unsigned int minbytesneeded)
|
|
{
|
|
int n;
|
|
|
|
/* minbytesneeded <= AES_BLOCK_SIZE */
|
|
if (gw->buf_bytes && gw->buf_bytes >= minbytesneeded) {
|
|
gw->ptr = gw->buf;
|
|
gw->nbytes = gw->buf_bytes;
|
|
goto out;
|
|
}
|
|
|
|
if (gw->walk_bytes_remain == 0) {
|
|
gw->ptr = NULL;
|
|
gw->nbytes = 0;
|
|
goto out;
|
|
}
|
|
|
|
gw->walk_bytes = scatterwalk_clamp(&gw->walk, gw->walk_bytes_remain);
|
|
if (!gw->walk_bytes) {
|
|
scatterwalk_start(&gw->walk, sg_next(gw->walk.sg));
|
|
gw->walk_bytes = scatterwalk_clamp(&gw->walk,
|
|
gw->walk_bytes_remain);
|
|
}
|
|
gw->walk_ptr = scatterwalk_map(&gw->walk);
|
|
|
|
if (!gw->buf_bytes && gw->walk_bytes >= minbytesneeded) {
|
|
gw->ptr = gw->walk_ptr;
|
|
gw->nbytes = gw->walk_bytes;
|
|
goto out;
|
|
}
|
|
|
|
while (1) {
|
|
n = min(gw->walk_bytes, AES_BLOCK_SIZE - gw->buf_bytes);
|
|
memcpy(gw->buf + gw->buf_bytes, gw->walk_ptr, n);
|
|
gw->buf_bytes += n;
|
|
gw->walk_bytes_remain -= n;
|
|
scatterwalk_unmap(&gw->walk);
|
|
scatterwalk_advance(&gw->walk, n);
|
|
scatterwalk_done(&gw->walk, 0, gw->walk_bytes_remain);
|
|
|
|
if (gw->buf_bytes >= minbytesneeded) {
|
|
gw->ptr = gw->buf;
|
|
gw->nbytes = gw->buf_bytes;
|
|
goto out;
|
|
}
|
|
|
|
gw->walk_bytes = scatterwalk_clamp(&gw->walk,
|
|
gw->walk_bytes_remain);
|
|
if (!gw->walk_bytes) {
|
|
scatterwalk_start(&gw->walk, sg_next(gw->walk.sg));
|
|
gw->walk_bytes = scatterwalk_clamp(&gw->walk,
|
|
gw->walk_bytes_remain);
|
|
}
|
|
gw->walk_ptr = scatterwalk_map(&gw->walk);
|
|
}
|
|
|
|
out:
|
|
return gw->nbytes;
|
|
}
|
|
|
|
static void gcm_sg_walk_done(struct gcm_sg_walk *gw, unsigned int bytesdone)
|
|
{
|
|
int n;
|
|
|
|
if (gw->ptr == NULL)
|
|
return;
|
|
|
|
if (gw->ptr == gw->buf) {
|
|
n = gw->buf_bytes - bytesdone;
|
|
if (n > 0) {
|
|
memmove(gw->buf, gw->buf + bytesdone, n);
|
|
gw->buf_bytes -= n;
|
|
} else
|
|
gw->buf_bytes = 0;
|
|
} else {
|
|
gw->walk_bytes_remain -= bytesdone;
|
|
scatterwalk_unmap(&gw->walk);
|
|
scatterwalk_advance(&gw->walk, bytesdone);
|
|
scatterwalk_done(&gw->walk, 0, gw->walk_bytes_remain);
|
|
}
|
|
}
|
|
|
|
static int gcm_aes_crypt(struct aead_request *req, unsigned int flags)
|
|
{
|
|
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
|
|
struct s390_aes_ctx *ctx = crypto_aead_ctx(tfm);
|
|
unsigned int ivsize = crypto_aead_ivsize(tfm);
|
|
unsigned int taglen = crypto_aead_authsize(tfm);
|
|
unsigned int aadlen = req->assoclen;
|
|
unsigned int pclen = req->cryptlen;
|
|
int ret = 0;
|
|
|
|
unsigned int len, in_bytes, out_bytes,
|
|
min_bytes, bytes, aad_bytes, pc_bytes;
|
|
struct gcm_sg_walk gw_in, gw_out;
|
|
u8 tag[GHASH_DIGEST_SIZE];
|
|
|
|
struct {
|
|
u32 _[3]; /* reserved */
|
|
u32 cv; /* Counter Value */
|
|
u8 t[GHASH_DIGEST_SIZE];/* Tag */
|
|
u8 h[AES_BLOCK_SIZE]; /* Hash-subkey */
|
|
u64 taadl; /* Total AAD Length */
|
|
u64 tpcl; /* Total Plain-/Cipher-text Length */
|
|
u8 j0[GHASH_BLOCK_SIZE];/* initial counter value */
|
|
u8 k[AES_MAX_KEY_SIZE]; /* Key */
|
|
} param;
|
|
|
|
/*
|
|
* encrypt
|
|
* req->src: aad||plaintext
|
|
* req->dst: aad||ciphertext||tag
|
|
* decrypt
|
|
* req->src: aad||ciphertext||tag
|
|
* req->dst: aad||plaintext, return 0 or -EBADMSG
|
|
* aad, plaintext and ciphertext may be empty.
|
|
*/
|
|
if (flags & CPACF_DECRYPT)
|
|
pclen -= taglen;
|
|
len = aadlen + pclen;
|
|
|
|
memset(¶m, 0, sizeof(param));
|
|
param.cv = 1;
|
|
param.taadl = aadlen * 8;
|
|
param.tpcl = pclen * 8;
|
|
memcpy(param.j0, req->iv, ivsize);
|
|
*(u32 *)(param.j0 + ivsize) = 1;
|
|
memcpy(param.k, ctx->key, ctx->key_len);
|
|
|
|
gcm_sg_walk_start(&gw_in, req->src, len);
|
|
gcm_sg_walk_start(&gw_out, req->dst, len);
|
|
|
|
do {
|
|
min_bytes = min_t(unsigned int,
|
|
aadlen > 0 ? aadlen : pclen, AES_BLOCK_SIZE);
|
|
in_bytes = gcm_sg_walk_go(&gw_in, min_bytes);
|
|
out_bytes = gcm_sg_walk_go(&gw_out, min_bytes);
|
|
bytes = min(in_bytes, out_bytes);
|
|
|
|
if (aadlen + pclen <= bytes) {
|
|
aad_bytes = aadlen;
|
|
pc_bytes = pclen;
|
|
flags |= CPACF_KMA_LAAD | CPACF_KMA_LPC;
|
|
} else {
|
|
if (aadlen <= bytes) {
|
|
aad_bytes = aadlen;
|
|
pc_bytes = (bytes - aadlen) &
|
|
~(AES_BLOCK_SIZE - 1);
|
|
flags |= CPACF_KMA_LAAD;
|
|
} else {
|
|
aad_bytes = bytes & ~(AES_BLOCK_SIZE - 1);
|
|
pc_bytes = 0;
|
|
}
|
|
}
|
|
|
|
if (aad_bytes > 0)
|
|
memcpy(gw_out.ptr, gw_in.ptr, aad_bytes);
|
|
|
|
cpacf_kma(ctx->fc | flags, ¶m,
|
|
gw_out.ptr + aad_bytes,
|
|
gw_in.ptr + aad_bytes, pc_bytes,
|
|
gw_in.ptr, aad_bytes);
|
|
|
|
gcm_sg_walk_done(&gw_in, aad_bytes + pc_bytes);
|
|
gcm_sg_walk_done(&gw_out, aad_bytes + pc_bytes);
|
|
aadlen -= aad_bytes;
|
|
pclen -= pc_bytes;
|
|
} while (aadlen + pclen > 0);
|
|
|
|
if (flags & CPACF_DECRYPT) {
|
|
scatterwalk_map_and_copy(tag, req->src, len, taglen, 0);
|
|
if (crypto_memneq(tag, param.t, taglen))
|
|
ret = -EBADMSG;
|
|
} else
|
|
scatterwalk_map_and_copy(param.t, req->dst, len, taglen, 1);
|
|
|
|
memzero_explicit(¶m, sizeof(param));
|
|
return ret;
|
|
}
|
|
|
|
static int gcm_aes_encrypt(struct aead_request *req)
|
|
{
|
|
return gcm_aes_crypt(req, CPACF_ENCRYPT);
|
|
}
|
|
|
|
static int gcm_aes_decrypt(struct aead_request *req)
|
|
{
|
|
return gcm_aes_crypt(req, CPACF_DECRYPT);
|
|
}
|
|
|
|
static struct aead_alg gcm_aes_aead = {
|
|
.setkey = gcm_aes_setkey,
|
|
.setauthsize = gcm_aes_setauthsize,
|
|
.encrypt = gcm_aes_encrypt,
|
|
.decrypt = gcm_aes_decrypt,
|
|
|
|
.ivsize = GHASH_BLOCK_SIZE - sizeof(u32),
|
|
.maxauthsize = GHASH_DIGEST_SIZE,
|
|
.chunksize = AES_BLOCK_SIZE,
|
|
|
|
.base = {
|
|
.cra_flags = CRYPTO_ALG_TYPE_AEAD,
|
|
.cra_blocksize = 1,
|
|
.cra_ctxsize = sizeof(struct s390_aes_ctx),
|
|
.cra_priority = 900,
|
|
.cra_name = "gcm(aes)",
|
|
.cra_driver_name = "gcm-aes-s390",
|
|
.cra_module = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static struct crypto_alg *aes_s390_algs_ptr[5];
|
|
static int aes_s390_algs_num;
|
|
static struct aead_alg *aes_s390_aead_alg;
|
|
|
|
static int aes_s390_register_alg(struct crypto_alg *alg)
|
|
{
|
|
int ret;
|
|
|
|
ret = crypto_register_alg(alg);
|
|
if (!ret)
|
|
aes_s390_algs_ptr[aes_s390_algs_num++] = alg;
|
|
return ret;
|
|
}
|
|
|
|
static void aes_s390_fini(void)
|
|
{
|
|
while (aes_s390_algs_num--)
|
|
crypto_unregister_alg(aes_s390_algs_ptr[aes_s390_algs_num]);
|
|
if (ctrblk)
|
|
free_page((unsigned long) ctrblk);
|
|
|
|
if (aes_s390_aead_alg)
|
|
crypto_unregister_aead(aes_s390_aead_alg);
|
|
}
|
|
|
|
static int __init aes_s390_init(void)
|
|
{
|
|
int ret;
|
|
|
|
/* Query available functions for KM, KMC, KMCTR and KMA */
|
|
cpacf_query(CPACF_KM, &km_functions);
|
|
cpacf_query(CPACF_KMC, &kmc_functions);
|
|
cpacf_query(CPACF_KMCTR, &kmctr_functions);
|
|
cpacf_query(CPACF_KMA, &kma_functions);
|
|
|
|
if (cpacf_test_func(&km_functions, CPACF_KM_AES_128) ||
|
|
cpacf_test_func(&km_functions, CPACF_KM_AES_192) ||
|
|
cpacf_test_func(&km_functions, CPACF_KM_AES_256)) {
|
|
ret = aes_s390_register_alg(&aes_alg);
|
|
if (ret)
|
|
goto out_err;
|
|
ret = aes_s390_register_alg(&ecb_aes_alg);
|
|
if (ret)
|
|
goto out_err;
|
|
}
|
|
|
|
if (cpacf_test_func(&kmc_functions, CPACF_KMC_AES_128) ||
|
|
cpacf_test_func(&kmc_functions, CPACF_KMC_AES_192) ||
|
|
cpacf_test_func(&kmc_functions, CPACF_KMC_AES_256)) {
|
|
ret = aes_s390_register_alg(&cbc_aes_alg);
|
|
if (ret)
|
|
goto out_err;
|
|
}
|
|
|
|
if (cpacf_test_func(&km_functions, CPACF_KM_XTS_128) ||
|
|
cpacf_test_func(&km_functions, CPACF_KM_XTS_256)) {
|
|
ret = aes_s390_register_alg(&xts_aes_alg);
|
|
if (ret)
|
|
goto out_err;
|
|
}
|
|
|
|
if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_128) ||
|
|
cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_192) ||
|
|
cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_256)) {
|
|
ctrblk = (u8 *) __get_free_page(GFP_KERNEL);
|
|
if (!ctrblk) {
|
|
ret = -ENOMEM;
|
|
goto out_err;
|
|
}
|
|
ret = aes_s390_register_alg(&ctr_aes_alg);
|
|
if (ret)
|
|
goto out_err;
|
|
}
|
|
|
|
if (cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_128) ||
|
|
cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_192) ||
|
|
cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_256)) {
|
|
ret = crypto_register_aead(&gcm_aes_aead);
|
|
if (ret)
|
|
goto out_err;
|
|
aes_s390_aead_alg = &gcm_aes_aead;
|
|
}
|
|
|
|
return 0;
|
|
out_err:
|
|
aes_s390_fini();
|
|
return ret;
|
|
}
|
|
|
|
module_cpu_feature_match(MSA, aes_s390_init);
|
|
module_exit(aes_s390_fini);
|
|
|
|
MODULE_ALIAS_CRYPTO("aes-all");
|
|
|
|
MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm");
|
|
MODULE_LICENSE("GPL");
|