cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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nx-aes-cbc.c (3245B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * AES CBC routines supporting the Power 7+ Nest Accelerators driver
      4 *
      5 * Copyright (C) 2011-2012 International Business Machines Inc.
      6 *
      7 * Author: Kent Yoder <yoder1@us.ibm.com>
      8 */
      9
     10#include <crypto/aes.h>
     11#include <crypto/algapi.h>
     12#include <linux/module.h>
     13#include <linux/types.h>
     14#include <linux/crypto.h>
     15#include <asm/vio.h>
     16
     17#include "nx_csbcpb.h"
     18#include "nx.h"
     19
     20
     21static int cbc_aes_nx_set_key(struct crypto_skcipher *tfm,
     22			      const u8               *in_key,
     23			      unsigned int            key_len)
     24{
     25	struct nx_crypto_ctx *nx_ctx = crypto_skcipher_ctx(tfm);
     26	struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
     27
     28	nx_ctx_init(nx_ctx, HCOP_FC_AES);
     29
     30	switch (key_len) {
     31	case AES_KEYSIZE_128:
     32		NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_128);
     33		nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_128];
     34		break;
     35	case AES_KEYSIZE_192:
     36		NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_192);
     37		nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_192];
     38		break;
     39	case AES_KEYSIZE_256:
     40		NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_256);
     41		nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_256];
     42		break;
     43	default:
     44		return -EINVAL;
     45	}
     46
     47	csbcpb->cpb.hdr.mode = NX_MODE_AES_CBC;
     48	memcpy(csbcpb->cpb.aes_cbc.key, in_key, key_len);
     49
     50	return 0;
     51}
     52
     53static int cbc_aes_nx_crypt(struct skcipher_request *req,
     54			    int                      enc)
     55{
     56	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
     57	struct nx_crypto_ctx *nx_ctx = crypto_skcipher_ctx(tfm);
     58	struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
     59	unsigned long irq_flags;
     60	unsigned int processed = 0, to_process;
     61	int rc;
     62
     63	spin_lock_irqsave(&nx_ctx->lock, irq_flags);
     64
     65	if (enc)
     66		NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT;
     67	else
     68		NX_CPB_FDM(csbcpb) &= ~NX_FDM_ENDE_ENCRYPT;
     69
     70	do {
     71		to_process = req->cryptlen - processed;
     72
     73		rc = nx_build_sg_lists(nx_ctx, req->iv, req->dst, req->src,
     74				       &to_process, processed,
     75				       csbcpb->cpb.aes_cbc.iv);
     76		if (rc)
     77			goto out;
     78
     79		if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {
     80			rc = -EINVAL;
     81			goto out;
     82		}
     83
     84		rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
     85				   req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
     86		if (rc)
     87			goto out;
     88
     89		memcpy(req->iv, csbcpb->cpb.aes_cbc.cv, AES_BLOCK_SIZE);
     90		atomic_inc(&(nx_ctx->stats->aes_ops));
     91		atomic64_add(be32_to_cpu(csbcpb->csb.processed_byte_count),
     92			     &(nx_ctx->stats->aes_bytes));
     93
     94		processed += to_process;
     95	} while (processed < req->cryptlen);
     96out:
     97	spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
     98	return rc;
     99}
    100
    101static int cbc_aes_nx_encrypt(struct skcipher_request *req)
    102{
    103	return cbc_aes_nx_crypt(req, 1);
    104}
    105
    106static int cbc_aes_nx_decrypt(struct skcipher_request *req)
    107{
    108	return cbc_aes_nx_crypt(req, 0);
    109}
    110
    111struct skcipher_alg nx_cbc_aes_alg = {
    112	.base.cra_name		= "cbc(aes)",
    113	.base.cra_driver_name	= "cbc-aes-nx",
    114	.base.cra_priority	= 300,
    115	.base.cra_blocksize	= AES_BLOCK_SIZE,
    116	.base.cra_ctxsize	= sizeof(struct nx_crypto_ctx),
    117	.base.cra_alignmask	= 0xf,
    118	.base.cra_module	= THIS_MODULE,
    119	.init			= nx_crypto_ctx_aes_cbc_init,
    120	.exit			= nx_crypto_ctx_skcipher_exit,
    121	.min_keysize		= AES_MIN_KEY_SIZE,
    122	.max_keysize		= AES_MAX_KEY_SIZE,
    123	.ivsize			= AES_BLOCK_SIZE,
    124	.setkey			= cbc_aes_nx_set_key,
    125	.encrypt		= cbc_aes_nx_encrypt,
    126	.decrypt		= cbc_aes_nx_decrypt,
    127};