Pileus Git - ~andy/linux/blob - drivers/crypto/nx/nx-sha256.c

   1 /**
   2  * SHA-256 routines supporting the Power 7+ Nest Accelerators driver
   3  *
   4  * Copyright (C) 2011-2012 International Business Machines Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; version 2 only.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  *
  19  * Author: Kent Yoder <yoder1@us.ibm.com>
  20  */
  21
  22 #include <crypto/internal/hash.h>
  23 #include <crypto/sha.h>
  24 #include <linux/module.h>
  25 #include <asm/vio.h>
  26
  27 #include "nx_csbcpb.h"
  28 #include "nx.h"
  29
  30
  31 static int nx_sha256_init(struct shash_desc *desc)
  32 {
  33         struct sha256_state *sctx = shash_desc_ctx(desc);
  34         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
  35         struct nx_sg *out_sg;
  36
  37         nx_ctx_init(nx_ctx, HCOP_FC_SHA);
  38
  39         memset(sctx, 0, sizeof *sctx);
  40
  41         nx_ctx->ap = &nx_ctx->props[NX_PROPS_SHA256];
  42
  43         NX_CPB_SET_DIGEST_SIZE(nx_ctx->csbcpb, NX_DS_SHA256);
  44         out_sg = nx_build_sg_list(nx_ctx->out_sg, (u8 *)sctx->state,
  45                                   SHA256_DIGEST_SIZE, nx_ctx->ap->sglen);
  46         nx_ctx->op.outlen = (nx_ctx->out_sg - out_sg) * sizeof(struct nx_sg);
  47
  48         return 0;
  49 }
  50
  51 static int nx_sha256_update(struct shash_desc *desc, const u8 *data,
  52                             unsigned int len)
  53 {
  54         struct sha256_state *sctx = shash_desc_ctx(desc);
  55         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
  56         struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
  57         struct nx_sg *in_sg;
  58         u64 to_process, leftover, total;
  59         u32 max_sg_len;
  60         int rc = 0;
  61
  62         /* 2 cases for total data len:
  63          *  1: < SHA256_BLOCK_SIZE: copy into state, return 0
  64          *  2: >= SHA256_BLOCK_SIZE: process X blocks, copy in leftover
  65          */
  66         total = sctx->count + len;
  67         if (total < SHA256_BLOCK_SIZE) {
  68                 memcpy(sctx->buf + sctx->count, data, len);
  69                 sctx->count += len;
  70                 goto out;
  71         }
  72
  73         in_sg = nx_ctx->in_sg;
  74         max_sg_len = min_t(u32, nx_driver.of.max_sg_len/sizeof(struct nx_sg),
  75                            nx_ctx->ap->sglen);
  76
  77         do {
  78                 /*
  79                  * to_process: the SHA256_BLOCK_SIZE data chunk to process in
  80                  * this update. This value is also restricted by the sg list
  81                  * limits.
  82                  */
  83                 to_process = min_t(u64, total, nx_ctx->ap->databytelen);
  84                 to_process = min_t(u64, to_process,
  85                                    NX_PAGE_SIZE * (max_sg_len - 1));
  86                 to_process = to_process & ~(SHA256_BLOCK_SIZE - 1);
  87                 leftover = total - to_process;
  88
  89                 if (sctx->count) {
  90                         in_sg = nx_build_sg_list(nx_ctx->in_sg,
  91                                                  (u8 *) sctx->buf,
  92                                                  sctx->count, max_sg_len);
  93                 }
  94                 in_sg = nx_build_sg_list(in_sg, (u8 *) data,
  95                                          to_process - sctx->count,
  96                                          max_sg_len);
  97                 nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) *
  98                                         sizeof(struct nx_sg);
  99
 100                 if (NX_CPB_FDM(csbcpb) & NX_FDM_CONTINUATION) {
 101                         /*
 102                          * we've hit the nx chip previously and we're updating
 103                          * again, so copy over the partial digest.
 104                          */
 105                         memcpy(csbcpb->cpb.sha256.input_partial_digest,
 106                                csbcpb->cpb.sha256.message_digest,
 107                                SHA256_DIGEST_SIZE);
 108                 }
 109
 110                 NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
 111                 if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {
 112                         rc = -EINVAL;
 113                         goto out;
 114                 }
 115
 116                 rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
 117                                    desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
 118                 if (rc)
 119                         goto out;
 120
 121                 atomic_inc(&(nx_ctx->stats->sha256_ops));
 122                 csbcpb->cpb.sha256.message_bit_length += (u64)
 123                         (csbcpb->cpb.sha256.spbc * 8);
 124
 125                 /* everything after the first update is continuation */
 126                 NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
 127
 128                 total -= to_process;
 129                 data += to_process;
 130                 sctx->count = 0;
 131                 in_sg = nx_ctx->in_sg;
 132         } while (leftover >= SHA256_BLOCK_SIZE);
 133
 134         /* copy the leftover back into the state struct */
 135         if (leftover)
 136                 memcpy(sctx->buf, data, leftover);
 137         sctx->count = leftover;
 138 out:
 139         return rc;
 140 }
 141
 142 static int nx_sha256_final(struct shash_desc *desc, u8 *out)
 143 {
 144         struct sha256_state *sctx = shash_desc_ctx(desc);
 145         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
 146         struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
 147         struct nx_sg *in_sg, *out_sg;
 148         u32 max_sg_len;
 149         int rc;
 150
 151         max_sg_len = min_t(u32, nx_driver.of.max_sg_len, nx_ctx->ap->sglen);
 152
 153         if (NX_CPB_FDM(csbcpb) & NX_FDM_CONTINUATION) {
 154                 /* we've hit the nx chip previously, now we're finalizing,
 155                  * so copy over the partial digest */
 156                 memcpy(csbcpb->cpb.sha256.input_partial_digest,
 157                        csbcpb->cpb.sha256.message_digest, SHA256_DIGEST_SIZE);
 158         }
 159
 160         /* final is represented by continuing the operation and indicating that
 161          * this is not an intermediate operation */
 162         NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
 163
 164         csbcpb->cpb.sha256.message_bit_length += (u64)(sctx->count * 8);
 165
 166         in_sg = nx_build_sg_list(nx_ctx->in_sg, (u8 *)sctx->buf,
 167                                  sctx->count, max_sg_len);
 168         out_sg = nx_build_sg_list(nx_ctx->out_sg, out, SHA256_DIGEST_SIZE,
 169                                   max_sg_len);
 170         nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) * sizeof(struct nx_sg);
 171         nx_ctx->op.outlen = (nx_ctx->out_sg - out_sg) * sizeof(struct nx_sg);
 172
 173         if (!nx_ctx->op.outlen) {
 174                 rc = -EINVAL;
 175                 goto out;
 176         }
 177
 178         rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
 179                            desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
 180         if (rc)
 181                 goto out;
 182
 183         atomic_inc(&(nx_ctx->stats->sha256_ops));
 184
 185         atomic64_add(csbcpb->cpb.sha256.message_bit_length / 8,
 186                      &(nx_ctx->stats->sha256_bytes));
 187         memcpy(out, csbcpb->cpb.sha256.message_digest, SHA256_DIGEST_SIZE);
 188 out:
 189         return rc;
 190 }
 191
 192 static int nx_sha256_export(struct shash_desc *desc, void *out)
 193 {
 194         struct sha256_state *sctx = shash_desc_ctx(desc);
 195         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
 196         struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
 197         struct sha256_state *octx = out;
 198
 199         octx->count = sctx->count +
 200                       (csbcpb->cpb.sha256.message_bit_length / 8);
 201         memcpy(octx->buf, sctx->buf, sizeof(octx->buf));
 202
 203         /* if no data has been processed yet, we need to export SHA256's
 204          * initial data, in case this context gets imported into a software
 205          * context */
 206         if (csbcpb->cpb.sha256.message_bit_length)
 207                 memcpy(octx->state, csbcpb->cpb.sha256.message_digest,
 208                        SHA256_DIGEST_SIZE);
 209         else {
 210                 octx->state[0] = SHA256_H0;
 211                 octx->state[1] = SHA256_H1;
 212                 octx->state[2] = SHA256_H2;
 213                 octx->state[3] = SHA256_H3;
 214                 octx->state[4] = SHA256_H4;
 215                 octx->state[5] = SHA256_H5;
 216                 octx->state[6] = SHA256_H6;
 217                 octx->state[7] = SHA256_H7;
 218         }
 219
 220         return 0;
 221 }
 222
 223 static int nx_sha256_import(struct shash_desc *desc, const void *in)
 224 {
 225         struct sha256_state *sctx = shash_desc_ctx(desc);
 226         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
 227         struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
 228         const struct sha256_state *ictx = in;
 229
 230         memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
 231
 232         sctx->count = ictx->count & 0x3f;
 233         csbcpb->cpb.sha256.message_bit_length = (ictx->count & ~0x3f) * 8;
 234
 235         if (csbcpb->cpb.sha256.message_bit_length) {
 236                 memcpy(csbcpb->cpb.sha256.message_digest, ictx->state,
 237                        SHA256_DIGEST_SIZE);
 238
 239                 NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
 240                 NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
 241         }
 242
 243         return 0;
 244 }
 245
 246 struct shash_alg nx_shash_sha256_alg = {
 247         .digestsize = SHA256_DIGEST_SIZE,
 248         .init       = nx_sha256_init,
 249         .update     = nx_sha256_update,
 250         .final      = nx_sha256_final,
 251         .export     = nx_sha256_export,
 252         .import     = nx_sha256_import,
 253         .descsize   = sizeof(struct sha256_state),
 254         .statesize  = sizeof(struct sha256_state),
 255         .base       = {
 256                 .cra_name        = "sha256",
 257                 .cra_driver_name = "sha256-nx",
 258                 .cra_priority    = 300,
 259                 .cra_flags       = CRYPTO_ALG_TYPE_SHASH,
 260                 .cra_blocksize   = SHA256_BLOCK_SIZE,
 261                 .cra_module      = THIS_MODULE,
 262                 .cra_ctxsize     = sizeof(struct nx_crypto_ctx),
 263                 .cra_init        = nx_crypto_ctx_sha_init,
 264                 .cra_exit        = nx_crypto_ctx_exit,
 265         }
 266 };