drivers/crypto/nx/nx-sha512.c

   1 /**
   2  * SHA-512 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_sha512_init(struct shash_desc *desc)
  32 {
  33         struct sha512_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_SHA512];
  42
  43         NX_CPB_SET_DIGEST_SIZE(nx_ctx->csbcpb, NX_DS_SHA512);
  44         out_sg = nx_build_sg_list(nx_ctx->out_sg, (u8 *)sctx->state,
  45                                   SHA512_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_sha512_update(struct shash_desc *desc, const u8 *data,
  52                             unsigned int len)
  53 {
  54         struct sha512_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, spbc_bits;
  59         u32 max_sg_len;
  60         int rc = 0;
  61
  62         /* 2 cases for total data len:
  63          *  1: < SHA512_BLOCK_SIZE: copy into state, return 0
  64          *  2: >= SHA512_BLOCK_SIZE: process X blocks, copy in leftover
  65          */
  66         total = sctx->count[0] + len;
  67         if (total < SHA512_BLOCK_SIZE) {
  68                 memcpy(sctx->buf + sctx->count[0], data, len);
  69                 sctx->count[0] += 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 SHA512_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 & ~(SHA512_BLOCK_SIZE - 1);
  87                 leftover = total - to_process;
  88
  89                 if (sctx->count[0]) {
  90                         in_sg = nx_build_sg_list(nx_ctx->in_sg,
  91                                                  (u8 *) sctx->buf,
  92                                                  sctx->count[0], max_sg_len);
  93                 }
  94                 in_sg = nx_build_sg_list(in_sg, (u8 *) data,
  95                                          to_process - sctx->count[0],
  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.sha512.input_partial_digest,
 106                                csbcpb->cpb.sha512.message_digest,
 107                                SHA512_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->sha512_ops));
 122                 spbc_bits = csbcpb->cpb.sha512.spbc * 8;
 123                 csbcpb->cpb.sha512.message_bit_length_lo += spbc_bits;
 124                 if (csbcpb->cpb.sha512.message_bit_length_lo < spbc_bits)
 125                         csbcpb->cpb.sha512.message_bit_length_hi++;
 126
 127                 /* everything after the first update is continuation */
 128                 NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
 129
 130                 total -= to_process;
 131                 data += to_process;
 132                 sctx->count[0] = 0;
 133                 in_sg = nx_ctx->in_sg;
 134         } while (leftover >= SHA512_BLOCK_SIZE);
 135
 136         /* copy the leftover back into the state struct */
 137         if (leftover)
 138                 memcpy(sctx->buf, data, leftover);
 139         sctx->count[0] = leftover;
 140 out:
 141         return rc;
 142 }
 143
 144 static int nx_sha512_final(struct shash_desc *desc, u8 *out)
 145 {
 146         struct sha512_state *sctx = shash_desc_ctx(desc);
 147         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
 148         struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
 149         struct nx_sg *in_sg, *out_sg;
 150         u32 max_sg_len;
 151         u64 count0;
 152         int rc;
 153
 154         max_sg_len = min_t(u32, nx_driver.of.max_sg_len, nx_ctx->ap->sglen);
 155
 156         if (NX_CPB_FDM(csbcpb) & NX_FDM_CONTINUATION) {
 157                 /* we've hit the nx chip previously, now we're finalizing,
 158                  * so copy over the partial digest */
 159                 memcpy(csbcpb->cpb.sha512.input_partial_digest,
 160                        csbcpb->cpb.sha512.message_digest, SHA512_DIGEST_SIZE);
 161         }
 162
 163         /* final is represented by continuing the operation and indicating that
 164          * this is not an intermediate operation */
 165         NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
 166
 167         count0 = sctx->count[0] * 8;
 168
 169         csbcpb->cpb.sha512.message_bit_length_lo += count0;
 170         if (csbcpb->cpb.sha512.message_bit_length_lo < count0)
 171                 csbcpb->cpb.sha512.message_bit_length_hi++;
 172
 173         in_sg = nx_build_sg_list(nx_ctx->in_sg, sctx->buf, sctx->count[0],
 174                                  max_sg_len);
 175         out_sg = nx_build_sg_list(nx_ctx->out_sg, out, SHA512_DIGEST_SIZE,
 176                                   max_sg_len);
 177         nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) * sizeof(struct nx_sg);
 178         nx_ctx->op.outlen = (nx_ctx->out_sg - out_sg) * sizeof(struct nx_sg);
 179
 180         if (!nx_ctx->op.outlen) {
 181                 rc = -EINVAL;
 182                 goto out;
 183         }
 184
 185         rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
 186                            desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
 187         if (rc)
 188                 goto out;
 189
 190         atomic_inc(&(nx_ctx->stats->sha512_ops));
 191         atomic64_add(csbcpb->cpb.sha512.message_bit_length_lo / 8,
 192                      &(nx_ctx->stats->sha512_bytes));
 193
 194         memcpy(out, csbcpb->cpb.sha512.message_digest, SHA512_DIGEST_SIZE);
 195 out:
 196         return rc;
 197 }
 198
 199 static int nx_sha512_export(struct shash_desc *desc, void *out)
 200 {
 201         struct sha512_state *sctx = shash_desc_ctx(desc);
 202         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
 203         struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
 204         struct sha512_state *octx = out;
 205
 206         /* move message_bit_length (128 bits) into count and convert its value
 207          * to bytes */
 208         octx->count[0] = csbcpb->cpb.sha512.message_bit_length_lo >> 3 |
 209                          ((csbcpb->cpb.sha512.message_bit_length_hi & 7) << 61);
 210         octx->count[1] = csbcpb->cpb.sha512.message_bit_length_hi >> 3;
 211
 212         octx->count[0] += sctx->count[0];
 213         if (octx->count[0] < sctx->count[0])
 214                 octx->count[1]++;
 215
 216         memcpy(octx->buf, sctx->buf, sizeof(octx->buf));
 217
 218         /* if no data has been processed yet, we need to export SHA512's
 219          * initial data, in case this context gets imported into a software
 220          * context */
 221         if (csbcpb->cpb.sha512.message_bit_length_hi ||
 222             csbcpb->cpb.sha512.message_bit_length_lo)
 223                 memcpy(octx->state, csbcpb->cpb.sha512.message_digest,
 224                        SHA512_DIGEST_SIZE);
 225         else {
 226                 octx->state[0] = SHA512_H0;
 227                 octx->state[1] = SHA512_H1;
 228                 octx->state[2] = SHA512_H2;
 229                 octx->state[3] = SHA512_H3;
 230                 octx->state[4] = SHA512_H4;
 231                 octx->state[5] = SHA512_H5;
 232                 octx->state[6] = SHA512_H6;
 233                 octx->state[7] = SHA512_H7;
 234         }
 235
 236         return 0;
 237 }
 238
 239 static int nx_sha512_import(struct shash_desc *desc, const void *in)
 240 {
 241         struct sha512_state *sctx = shash_desc_ctx(desc);
 242         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
 243         struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
 244         const struct sha512_state *ictx = in;
 245
 246         memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
 247         sctx->count[0] = ictx->count[0] & 0x3f;
 248         csbcpb->cpb.sha512.message_bit_length_lo = (ictx->count[0] & ~0x3f)
 249                                                         << 3;
 250         csbcpb->cpb.sha512.message_bit_length_hi = ictx->count[1] << 3 |
 251                                                    ictx->count[0] >> 61;
 252
 253         if (csbcpb->cpb.sha512.message_bit_length_hi ||
 254             csbcpb->cpb.sha512.message_bit_length_lo) {
 255                 memcpy(csbcpb->cpb.sha512.message_digest, ictx->state,
 256                        SHA512_DIGEST_SIZE);
 257
 258                 NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
 259                 NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
 260         }
 261
 262         return 0;
 263 }
 264
 265 struct shash_alg nx_shash_sha512_alg = {
 266         .digestsize = SHA512_DIGEST_SIZE,
 267         .init       = nx_sha512_init,
 268         .update     = nx_sha512_update,
 269         .final      = nx_sha512_final,
 270         .export     = nx_sha512_export,
 271         .import     = nx_sha512_import,
 272         .descsize   = sizeof(struct sha512_state),
 273         .statesize  = sizeof(struct sha512_state),
 274         .base       = {
 275                 .cra_name        = "sha512",
 276                 .cra_driver_name = "sha512-nx",
 277                 .cra_priority    = 300,
 278                 .cra_flags       = CRYPTO_ALG_TYPE_SHASH,
 279                 .cra_blocksize   = SHA512_BLOCK_SIZE,
 280                 .cra_module      = THIS_MODULE,
 281                 .cra_ctxsize     = sizeof(struct nx_crypto_ctx),
 282                 .cra_init        = nx_crypto_ctx_sha_init,
 283                 .cra_exit        = nx_crypto_ctx_exit,
 284         }
 285 };