cregit-Linux how code gets into the kernel

Release 4.11 drivers/crypto/vmx/aes_cbc.c

/**
 * AES CBC routines supporting VMX instructions on the Power 8
 *
 * Copyright (C) 2015 International Business Machines Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 only.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Author: Marcelo Henrique Cerri <mhcerri@br.ibm.com>
 */

#include <linux/types.h>
#include <linux/err.h>
#include <linux/crypto.h>
#include <linux/delay.h>
#include <linux/hardirq.h>
#include <asm/switch_to.h>
#include <crypto/aes.h>
#include <crypto/scatterwalk.h>
#include <crypto/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_tfm *tfm) { const char *alg; struct crypto_skcipher *fallback; struct p8_aes_cbc_ctx *ctx = crypto_tfm_ctx(tfm); if (!(alg = crypto_tfm_alg_name(tfm))) { printk(KERN_ERR "Failed to get algorithm name.\n"); return -ENOENT; } fallback = crypto_alloc_skcipher(alg, 0, CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK); if (IS_ERR(fallback)) { printk(KERN_ERR "Failed to allocate transformation for '%s': %ld\n", alg, PTR_ERR(fallback)); return PTR_ERR(fallback); } printk(KERN_INFO "Using '%s' as fallback implementation.\n", crypto_skcipher_driver_name(fallback)); crypto_skcipher_set_flags( fallback, crypto_skcipher_get_flags((struct crypto_skcipher *)tfm)); ctx->fallback = fallback; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Marcelo H. Cerri12393.89%150.00%
Paulo Flabiano Smorigo86.11%150.00%
Total131100.00%2100.00%


static void p8_aes_cbc_exit(struct crypto_tfm *tfm) { struct p8_aes_cbc_ctx *ctx = crypto_tfm_ctx(tfm); if (ctx->fallback) { crypto_free_skcipher(ctx->fallback); ctx->fallback = NULL; } }

Contributors

PersonTokensPropCommitsCommitProp
Marcelo H. Cerri4197.62%150.00%
Paulo Flabiano Smorigo12.38%150.00%
Total42100.00%2100.00%


static int p8_aes_cbc_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) { int ret; struct p8_aes_cbc_ctx *ctx = crypto_tfm_ctx(tfm); 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; }

Contributors

PersonTokensPropCommitsCommitProp
Marcelo H. Cerri8686.87%120.00%
David Hildenbrand66.06%120.00%
Anton Blanchard33.03%120.00%
Leonidas Da Silva Barbosa33.03%120.00%
Paulo Flabiano Smorigo11.01%120.00%
Total99100.00%5100.00%


static int p8_aes_cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes) { int ret; struct blkcipher_walk walk; struct p8_aes_cbc_ctx *ctx = crypto_tfm_ctx(crypto_blkcipher_tfm(desc->tfm)); if (in_interrupt()) { SKCIPHER_REQUEST_ON_STACK(req, ctx->fallback); skcipher_request_set_tfm(req, 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); } else { preempt_disable(); pagefault_disable(); enable_kernel_vsx(); blkcipher_walk_init(&walk, dst, src, nbytes); ret = blkcipher_walk_virt(desc, &walk); while ((nbytes = walk.nbytes)) { aes_p8_cbc_encrypt(walk.src.virt.addr, walk.dst.virt.addr, nbytes & AES_BLOCK_MASK, &ctx->enc_key, walk.iv, 1); nbytes &= AES_BLOCK_SIZE - 1; ret = blkcipher_walk_done(desc, &walk, nbytes); } disable_kernel_vsx(); pagefault_enable(); preempt_enable(); } return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Marcelo H. Cerri16172.52%120.00%
Paulo Flabiano Smorigo4922.07%120.00%
David Hildenbrand62.70%120.00%
Leonidas Da Silva Barbosa31.35%120.00%
Anton Blanchard31.35%120.00%
Total222100.00%5100.00%


static int p8_aes_cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes) { int ret; struct blkcipher_walk walk; struct p8_aes_cbc_ctx *ctx = crypto_tfm_ctx(crypto_blkcipher_tfm(desc->tfm)); if (in_interrupt()) { SKCIPHER_REQUEST_ON_STACK(req, ctx->fallback); skcipher_request_set_tfm(req, 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); } else { preempt_disable(); pagefault_disable(); enable_kernel_vsx(); blkcipher_walk_init(&walk, dst, src, nbytes); ret = blkcipher_walk_virt(desc, &walk); while ((nbytes = walk.nbytes)) { aes_p8_cbc_encrypt(walk.src.virt.addr, walk.dst.virt.addr, nbytes & AES_BLOCK_MASK, &ctx->dec_key, walk.iv, 0); nbytes &= AES_BLOCK_SIZE - 1; ret = blkcipher_walk_done(desc, &walk, nbytes); } disable_kernel_vsx(); pagefault_enable(); preempt_enable(); } return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Marcelo H. Cerri16172.52%120.00%
Paulo Flabiano Smorigo4922.07%120.00%
David Hildenbrand62.70%120.00%
Anton Blanchard31.35%120.00%
Leonidas Da Silva Barbosa31.35%120.00%
Total222100.00%5100.00%

struct crypto_alg p8_aes_cbc_alg = { .cra_name = "cbc(aes)", .cra_driver_name = "p8_aes_cbc", .cra_module = THIS_MODULE, .cra_priority = 2000, .cra_type = &crypto_blkcipher_type, .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER | CRYPTO_ALG_NEED_FALLBACK, .cra_alignmask = 0, .cra_blocksize = AES_BLOCK_SIZE, .cra_ctxsize = sizeof(struct p8_aes_cbc_ctx), .cra_init = p8_aes_cbc_init, .cra_exit = p8_aes_cbc_exit, .cra_blkcipher = { .ivsize = AES_BLOCK_SIZE, .min_keysize = AES_MIN_KEY_SIZE, .max_keysize = AES_MAX_KEY_SIZE, .setkey = p8_aes_cbc_setkey, .encrypt = p8_aes_cbc_encrypt, .decrypt = p8_aes_cbc_decrypt, }, };

Overall Contributors

PersonTokensPropCommitsCommitProp
Marcelo H. Cerri71782.60%112.50%
Paulo Flabiano Smorigo11212.90%112.50%
David Hildenbrand182.07%112.50%
Anton Blanchard101.15%225.00%
Leonidas Da Silva Barbosa101.15%225.00%
Herbert Xu10.12%112.50%
Total868100.00%8100.00%
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