drivers/crypto/nx/nx-sha512.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /**
   3  * SHA-512 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/internal/hash.h>
  11 #include <crypto/sha.h>
  12 #include <linux/module.h>
  13 #include <asm/vio.h>
  14
  15 #include "nx_csbcpb.h"
  16 #include "nx.h"
  17
  18
  19 static int nx_crypto_ctx_sha512_init(struct crypto_tfm *tfm)
  20 {
  21         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm);
  22         int err;
  23
  24         err = nx_crypto_ctx_sha_init(tfm);
  25         if (err)
  26                 return err;
  27
  28         nx_ctx_init(nx_ctx, HCOP_FC_SHA);
  29
  30         nx_ctx->ap = &nx_ctx->props[NX_PROPS_SHA512];
  31
  32         NX_CPB_SET_DIGEST_SIZE(nx_ctx->csbcpb, NX_DS_SHA512);
  33
  34         return 0;
  35 }
  36
  37 static int nx_sha512_init(struct shash_desc *desc)
  38 {
  39         struct sha512_state *sctx = shash_desc_ctx(desc);
  40
  41         memset(sctx, 0, sizeof *sctx);
  42
  43         sctx->state[0] = __cpu_to_be64(SHA512_H0);
  44         sctx->state[1] = __cpu_to_be64(SHA512_H1);
  45         sctx->state[2] = __cpu_to_be64(SHA512_H2);
  46         sctx->state[3] = __cpu_to_be64(SHA512_H3);
  47         sctx->state[4] = __cpu_to_be64(SHA512_H4);
  48         sctx->state[5] = __cpu_to_be64(SHA512_H5);
  49         sctx->state[6] = __cpu_to_be64(SHA512_H6);
  50         sctx->state[7] = __cpu_to_be64(SHA512_H7);
  51         sctx->count[0] = 0;
  52
  53         return 0;
  54 }
  55
  56 static int nx_sha512_update(struct shash_desc *desc, const u8 *data,
  57                             unsigned int len)
  58 {
  59         struct sha512_state *sctx = shash_desc_ctx(desc);
  60         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
  61         struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
  62         struct nx_sg *out_sg;
  63         u64 to_process, leftover = 0, total;
  64         unsigned long irq_flags;
  65         int rc = 0;
  66         int data_len;
  67         u32 max_sg_len;
  68         u64 buf_len = (sctx->count[0] % SHA512_BLOCK_SIZE);
  69
  70         spin_lock_irqsave(&nx_ctx->lock, irq_flags);
  71
  72         /* 2 cases for total data len:
  73          *  1: < SHA512_BLOCK_SIZE: copy into state, return 0
  74          *  2: >= SHA512_BLOCK_SIZE: process X blocks, copy in leftover
  75          */
  76         total = (sctx->count[0] % SHA512_BLOCK_SIZE) + len;
  77         if (total < SHA512_BLOCK_SIZE) {
  78                 memcpy(sctx->buf + buf_len, data, len);
  79                 sctx->count[0] += len;
  80                 goto out;
  81         }
  82
  83         memcpy(csbcpb->cpb.sha512.message_digest, sctx->state, SHA512_DIGEST_SIZE);
  84         NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
  85         NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
  86
  87         max_sg_len = min_t(u64, nx_ctx->ap->sglen,
  88                         nx_driver.of.max_sg_len/sizeof(struct nx_sg));
  89         max_sg_len = min_t(u64, max_sg_len,
  90                         nx_ctx->ap->databytelen/NX_PAGE_SIZE);
  91
  92         data_len = SHA512_DIGEST_SIZE;
  93         out_sg = nx_build_sg_list(nx_ctx->out_sg, (u8 *)sctx->state,
  94                                   &data_len, max_sg_len);
  95         nx_ctx->op.outlen = (nx_ctx->out_sg - out_sg) * sizeof(struct nx_sg);
  96
  97         if (data_len != SHA512_DIGEST_SIZE) {
  98                 rc = -EINVAL;
  99                 goto out;
 100         }
 101
 102         do {
 103                 int used_sgs = 0;
 104                 struct nx_sg *in_sg = nx_ctx->in_sg;
 105
 106                 if (buf_len) {
 107                         data_len = buf_len;
 108                         in_sg = nx_build_sg_list(in_sg,
 109                                                  (u8 *) sctx->buf,
 110                                                  &data_len, max_sg_len);
 111
 112                         if (data_len != buf_len) {
 113                                 rc = -EINVAL;
 114                                 goto out;
 115                         }
 116                         used_sgs = in_sg - nx_ctx->in_sg;
 117                 }
 118
 119                 /* to_process: SHA512_BLOCK_SIZE aligned chunk to be
 120                  * processed in this iteration. This value is restricted
 121                  * by sg list limits and number of sgs we already used
 122                  * for leftover data. (see above)
 123                  * In ideal case, we could allow NX_PAGE_SIZE * max_sg_len,
 124                  * but because data may not be aligned, we need to account
 125                  * for that too. */
 126                 to_process = min_t(u64, total,
 127                         (max_sg_len - 1 - used_sgs) * NX_PAGE_SIZE);
 128                 to_process = to_process & ~(SHA512_BLOCK_SIZE - 1);
 129
 130                 data_len = to_process - buf_len;
 131                 in_sg = nx_build_sg_list(in_sg, (u8 *) data,
 132                                          &data_len, max_sg_len);
 133
 134                 nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) * sizeof(struct nx_sg);
 135
 136                 if (data_len != (to_process - buf_len)) {
 137                         rc = -EINVAL;
 138                         goto out;
 139                 }
 140
 141                 to_process = data_len + buf_len;
 142                 leftover = total - to_process;
 143
 144                 /*
 145                  * we've hit the nx chip previously and we're updating
 146                  * again, so copy over the partial digest.
 147                  */
 148                 memcpy(csbcpb->cpb.sha512.input_partial_digest,
 149                                csbcpb->cpb.sha512.message_digest,
 150                                SHA512_DIGEST_SIZE);
 151
 152                 if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {
 153                         rc = -EINVAL;
 154                         goto out;
 155                 }
 156
 157                 rc = nx_hcall_sync(nx_ctx, &nx_ctx->op, 0);
 158                 if (rc)
 159                         goto out;
 160
 161                 atomic_inc(&(nx_ctx->stats->sha512_ops));
 162
 163                 total -= to_process;
 164                 data += to_process - buf_len;
 165                 buf_len = 0;
 166
 167         } while (leftover >= SHA512_BLOCK_SIZE);
 168
 169         /* copy the leftover back into the state struct */
 170         if (leftover)
 171                 memcpy(sctx->buf, data, leftover);
 172         sctx->count[0] += len;
 173         memcpy(sctx->state, csbcpb->cpb.sha512.message_digest, SHA512_DIGEST_SIZE);
 174 out:
 175         spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
 176         return rc;
 177 }
 178
 179 static int nx_sha512_final(struct shash_desc *desc, u8 *out)
 180 {
 181         struct sha512_state *sctx = shash_desc_ctx(desc);
 182         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
 183         struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
 184         struct nx_sg *in_sg, *out_sg;
 185         u32 max_sg_len;
 186         u64 count0;
 187         unsigned long irq_flags;
 188         int rc = 0;
 189         int len;
 190
 191         spin_lock_irqsave(&nx_ctx->lock, irq_flags);
 192
 193         max_sg_len = min_t(u64, nx_ctx->ap->sglen,
 194                         nx_driver.of.max_sg_len/sizeof(struct nx_sg));
 195         max_sg_len = min_t(u64, max_sg_len,
 196                         nx_ctx->ap->databytelen/NX_PAGE_SIZE);
 197
 198         /* final is represented by continuing the operation and indicating that
 199          * this is not an intermediate operation */
 200         if (sctx->count[0] >= SHA512_BLOCK_SIZE) {
 201                 /* we've hit the nx chip previously, now we're finalizing,
 202                  * so copy over the partial digest */
 203                 memcpy(csbcpb->cpb.sha512.input_partial_digest, sctx->state,
 204                                                         SHA512_DIGEST_SIZE);
 205                 NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
 206                 NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
 207         } else {
 208                 NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
 209                 NX_CPB_FDM(csbcpb) &= ~NX_FDM_CONTINUATION;
 210         }
 211
 212         NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
 213
 214         count0 = sctx->count[0] * 8;
 215
 216         csbcpb->cpb.sha512.message_bit_length_lo = count0;
 217
 218         len = sctx->count[0] & (SHA512_BLOCK_SIZE - 1);
 219         in_sg = nx_build_sg_list(nx_ctx->in_sg, sctx->buf, &len,
 220                                  max_sg_len);
 221
 222         if (len != (sctx->count[0] & (SHA512_BLOCK_SIZE - 1))) {
 223                 rc = -EINVAL;
 224                 goto out;
 225         }
 226
 227         len = SHA512_DIGEST_SIZE;
 228         out_sg = nx_build_sg_list(nx_ctx->out_sg, out, &len,
 229                                  max_sg_len);
 230
 231         nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) * sizeof(struct nx_sg);
 232         nx_ctx->op.outlen = (nx_ctx->out_sg - out_sg) * sizeof(struct nx_sg);
 233
 234         if (!nx_ctx->op.outlen) {
 235                 rc = -EINVAL;
 236                 goto out;
 237         }
 238
 239         rc = nx_hcall_sync(nx_ctx, &nx_ctx->op, 0);
 240         if (rc)
 241                 goto out;
 242
 243         atomic_inc(&(nx_ctx->stats->sha512_ops));
 244         atomic64_add(sctx->count[0], &(nx_ctx->stats->sha512_bytes));
 245
 246         memcpy(out, csbcpb->cpb.sha512.message_digest, SHA512_DIGEST_SIZE);
 247 out:
 248         spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
 249         return rc;
 250 }
 251
 252 static int nx_sha512_export(struct shash_desc *desc, void *out)
 253 {
 254         struct sha512_state *sctx = shash_desc_ctx(desc);
 255
 256         memcpy(out, sctx, sizeof(*sctx));
 257
 258         return 0;
 259 }
 260
 261 static int nx_sha512_import(struct shash_desc *desc, const void *in)
 262 {
 263         struct sha512_state *sctx = shash_desc_ctx(desc);
 264
 265         memcpy(sctx, in, sizeof(*sctx));
 266
 267         return 0;
 268 }
 269
 270 struct shash_alg nx_shash_sha512_alg = {
 271         .digestsize = SHA512_DIGEST_SIZE,
 272         .init       = nx_sha512_init,
 273         .update     = nx_sha512_update,
 274         .final      = nx_sha512_final,
 275         .export     = nx_sha512_export,
 276         .import     = nx_sha512_import,
 277         .descsize   = sizeof(struct sha512_state),
 278         .statesize  = sizeof(struct sha512_state),
 279         .base       = {
 280                 .cra_name        = "sha512",
 281                 .cra_driver_name = "sha512-nx",
 282                 .cra_priority    = 300,
 283                 .cra_blocksize   = SHA512_BLOCK_SIZE,
 284                 .cra_module      = THIS_MODULE,
 285                 .cra_ctxsize     = sizeof(struct nx_crypto_ctx),
 286                 .cra_init        = nx_crypto_ctx_sha512_init,
 287                 .cra_exit        = nx_crypto_ctx_exit,
 288         }
 289 };