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         unsigned long irq_flags;
  61         int rc = 0;
  62
  63         spin_lock_irqsave(&nx_ctx->lock, irq_flags);
  64
  65         /* 2 cases for total data len:
  66          *  1: < SHA512_BLOCK_SIZE: copy into state, return 0
  67          *  2: >= SHA512_BLOCK_SIZE: process X blocks, copy in leftover
  68          */
  69         total = sctx->count[0] + len;
  70         if (total < SHA512_BLOCK_SIZE) {
  71                 memcpy(sctx->buf + sctx->count[0], data, len);
  72                 sctx->count[0] += len;
  73                 goto out;
  74         }
  75
  76         in_sg = nx_ctx->in_sg;
  77         max_sg_len = min_t(u32, nx_driver.of.max_sg_len/sizeof(struct nx_sg),
  78                            nx_ctx->ap->sglen);
  79
  80         do {
  81                 /*
  82                  * to_process: the SHA512_BLOCK_SIZE data chunk to process in
  83                  * this update. This value is also restricted by the sg list
  84                  * limits.
  85                  */
  86                 to_process = min_t(u64, total, nx_ctx->ap->databytelen);
  87                 to_process = min_t(u64, to_process,
  88                                    NX_PAGE_SIZE * (max_sg_len - 1));
  89                 to_process = to_process & ~(SHA512_BLOCK_SIZE - 1);
  90                 leftover = total - to_process;
  91
  92                 if (sctx->count[0]) {
  93                         in_sg = nx_build_sg_list(nx_ctx->in_sg,
  94                                                  (u8 *) sctx->buf,
  95                                                  sctx->count[0], max_sg_len);
  96                 }
  97                 in_sg = nx_build_sg_list(in_sg, (u8 *) data,
  98                                          to_process - sctx->count[0],
  99                                          max_sg_len);
 100                 nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) *
 101                                         sizeof(struct nx_sg);
 102
 103                 if (NX_CPB_FDM(csbcpb) & NX_FDM_CONTINUATION) {
 104                         /*
 105                          * we've hit the nx chip previously and we're updating
 106                          * again, so copy over the partial digest.
 107                          */
 108                         memcpy(csbcpb->cpb.sha512.input_partial_digest,
 109                                csbcpb->cpb.sha512.message_digest,
 110                                SHA512_DIGEST_SIZE);
 111                 }
 112
 113                 NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
 114                 if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {
 115                         rc = -EINVAL;
 116                         goto out;
 117                 }
 118
 119                 rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
 120                                    desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
 121                 if (rc)
 122                         goto out;
 123
 124                 atomic_inc(&(nx_ctx->stats->sha512_ops));
 125                 spbc_bits = csbcpb->cpb.sha512.spbc * 8;
 126                 csbcpb->cpb.sha512.message_bit_length_lo += spbc_bits;
 127                 if (csbcpb->cpb.sha512.message_bit_length_lo < spbc_bits)
 128                         csbcpb->cpb.sha512.message_bit_length_hi++;
 129
 130                 /* everything after the first update is continuation */
 131                 NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
 132
 133                 total -= to_process;
 134                 data += to_process - sctx->count[0];
 135                 sctx->count[0] = 0;
 136                 in_sg = nx_ctx->in_sg;
 137         } while (leftover >= SHA512_BLOCK_SIZE);
 138
 139         /* copy the leftover back into the state struct */
 140         if (leftover)
 141                 memcpy(sctx->buf, data, leftover);
 142         sctx->count[0] = leftover;
 143 out:
 144         spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
 145         return rc;
 146 }
 147
 148 static int nx_sha512_final(struct shash_desc *desc, u8 *out)
 149 {
 150         struct sha512_state *sctx = shash_desc_ctx(desc);
 151         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
 152         struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
 153         struct nx_sg *in_sg, *out_sg;
 154         u32 max_sg_len;
 155         u64 count0;
 156         unsigned long irq_flags;
 157         int rc;
 158
 159         spin_lock_irqsave(&nx_ctx->lock, irq_flags);
 160
 161         max_sg_len = min_t(u32, nx_driver.of.max_sg_len, nx_ctx->ap->sglen);
 162
 163         if (NX_CPB_FDM(csbcpb) & NX_FDM_CONTINUATION) {
 164                 /* we've hit the nx chip previously, now we're finalizing,
 165                  * so copy over the partial digest */
 166                 memcpy(csbcpb->cpb.sha512.input_partial_digest,
 167                        csbcpb->cpb.sha512.message_digest, SHA512_DIGEST_SIZE);
 168         }
 169
 170         /* final is represented by continuing the operation and indicating that
 171          * this is not an intermediate operation */
 172         NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
 173
 174         count0 = sctx->count[0] * 8;
 175
 176         csbcpb->cpb.sha512.message_bit_length_lo += count0;
 177         if (csbcpb->cpb.sha512.message_bit_length_lo < count0)
 178                 csbcpb->cpb.sha512.message_bit_length_hi++;
 179
 180         in_sg = nx_build_sg_list(nx_ctx->in_sg, sctx->buf, sctx->count[0],
 181                                  max_sg_len);
 182         out_sg = nx_build_sg_list(nx_ctx->out_sg, out, SHA512_DIGEST_SIZE,
 183                                   max_sg_len);
 184         nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) * sizeof(struct nx_sg);
 185         nx_ctx->op.outlen = (nx_ctx->out_sg - out_sg) * sizeof(struct nx_sg);
 186
 187         if (!nx_ctx->op.outlen) {
 188                 rc = -EINVAL;
 189                 goto out;
 190         }
 191
 192         rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
 193                            desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
 194         if (rc)
 195                 goto out;
 196
 197         atomic_inc(&(nx_ctx->stats->sha512_ops));
 198         atomic64_add(csbcpb->cpb.sha512.message_bit_length_lo / 8,
 199                      &(nx_ctx->stats->sha512_bytes));
 200
 201         memcpy(out, csbcpb->cpb.sha512.message_digest, SHA512_DIGEST_SIZE);
 202 out:
 203         spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
 204         return rc;
 205 }
 206
 207 static int nx_sha512_export(struct shash_desc *desc, void *out)
 208 {
 209         struct sha512_state *sctx = shash_desc_ctx(desc);
 210         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
 211         struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
 212         struct sha512_state *octx = out;
 213         unsigned long irq_flags;
 214
 215         spin_lock_irqsave(&nx_ctx->lock, irq_flags);
 216
 217         /* move message_bit_length (128 bits) into count and convert its value
 218          * to bytes */
 219         octx->count[0] = csbcpb->cpb.sha512.message_bit_length_lo >> 3 |
 220                          ((csbcpb->cpb.sha512.message_bit_length_hi & 7) << 61);
 221         octx->count[1] = csbcpb->cpb.sha512.message_bit_length_hi >> 3;
 222
 223         octx->count[0] += sctx->count[0];
 224         if (octx->count[0] < sctx->count[0])
 225                 octx->count[1]++;
 226
 227         memcpy(octx->buf, sctx->buf, sizeof(octx->buf));
 228
 229         /* if no data has been processed yet, we need to export SHA512's
 230          * initial data, in case this context gets imported into a software
 231          * context */
 232         if (csbcpb->cpb.sha512.message_bit_length_hi ||
 233             csbcpb->cpb.sha512.message_bit_length_lo)
 234                 memcpy(octx->state, csbcpb->cpb.sha512.message_digest,
 235                        SHA512_DIGEST_SIZE);
 236         else {
 237                 octx->state[0] = SHA512_H0;
 238                 octx->state[1] = SHA512_H1;
 239                 octx->state[2] = SHA512_H2;
 240                 octx->state[3] = SHA512_H3;
 241                 octx->state[4] = SHA512_H4;
 242                 octx->state[5] = SHA512_H5;
 243                 octx->state[6] = SHA512_H6;
 244                 octx->state[7] = SHA512_H7;
 245         }
 246
 247         spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
 248         return 0;
 249 }
 250
 251 static int nx_sha512_import(struct shash_desc *desc, const void *in)
 252 {
 253         struct sha512_state *sctx = shash_desc_ctx(desc);
 254         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
 255         struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
 256         const struct sha512_state *ictx = in;
 257         unsigned long irq_flags;
 258
 259         spin_lock_irqsave(&nx_ctx->lock, irq_flags);
 260
 261         memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
 262         sctx->count[0] = ictx->count[0] & 0x3f;
 263         csbcpb->cpb.sha512.message_bit_length_lo = (ictx->count[0] & ~0x3f)
 264                                                         << 3;
 265         csbcpb->cpb.sha512.message_bit_length_hi = ictx->count[1] << 3 |
 266                                                    ictx->count[0] >> 61;
 267
 268         if (csbcpb->cpb.sha512.message_bit_length_hi ||
 269             csbcpb->cpb.sha512.message_bit_length_lo) {
 270                 memcpy(csbcpb->cpb.sha512.message_digest, ictx->state,
 271                        SHA512_DIGEST_SIZE);
 272
 273                 NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
 274                 NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
 275         }
 276
 277         spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
 278         return 0;
 279 }
 280
 281 struct shash_alg nx_shash_sha512_alg = {
 282         .digestsize = SHA512_DIGEST_SIZE,
 283         .init       = nx_sha512_init,
 284         .update     = nx_sha512_update,
 285         .final      = nx_sha512_final,
 286         .export     = nx_sha512_export,
 287         .import     = nx_sha512_import,
 288         .descsize   = sizeof(struct sha512_state),
 289         .statesize  = sizeof(struct sha512_state),
 290         .base       = {
 291                 .cra_name        = "sha512",
 292                 .cra_driver_name = "sha512-nx",
 293                 .cra_priority    = 300,
 294                 .cra_flags       = CRYPTO_ALG_TYPE_SHASH,
 295                 .cra_blocksize   = SHA512_BLOCK_SIZE,
 296                 .cra_module      = THIS_MODULE,
 297                 .cra_ctxsize     = sizeof(struct nx_crypto_ctx),
 298                 .cra_init        = nx_crypto_ctx_sha_init,
 299                 .cra_exit        = nx_crypto_ctx_exit,
 300         }
 301 };