linux/drivers/crypto/nx/nx-aes-cbc.c
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   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(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};
 128