drivers/crypto/amcc/crypto4xx_alg.c

   1 /**
   2  * AMCC SoC PPC4xx Crypto Driver
   3  *
   4  * Copyright (c) 2008 Applied Micro Circuits Corporation.
   5  * All rights reserved. James Hsiao <jhsiao@amcc.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * This file implements the Linux crypto algorithms.
  18  */
  19
  20 #include <linux/kernel.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/spinlock_types.h>
  23 #include <linux/scatterlist.h>
  24 #include <linux/crypto.h>
  25 #include <linux/hash.h>
  26 #include <crypto/internal/hash.h>
  27 #include <linux/dma-mapping.h>
  28 #include <crypto/algapi.h>
  29 #include <crypto/aes.h>
  30 #include <crypto/sha.h>
  31 #include "crypto4xx_reg_def.h"
  32 #include "crypto4xx_sa.h"
  33 #include "crypto4xx_core.h"
  34
  35 void set_dynamic_sa_command_0(struct dynamic_sa_ctl *sa, u32 save_h,
  36                               u32 save_iv, u32 ld_h, u32 ld_iv, u32 hdr_proc,
  37                               u32 h, u32 c, u32 pad_type, u32 op_grp, u32 op,
  38                               u32 dir)
  39 {
  40         sa->sa_command_0.w = 0;
  41         sa->sa_command_0.bf.save_hash_state = save_h;
  42         sa->sa_command_0.bf.save_iv = save_iv;
  43         sa->sa_command_0.bf.load_hash_state = ld_h;
  44         sa->sa_command_0.bf.load_iv = ld_iv;
  45         sa->sa_command_0.bf.hdr_proc = hdr_proc;
  46         sa->sa_command_0.bf.hash_alg = h;
  47         sa->sa_command_0.bf.cipher_alg = c;
  48         sa->sa_command_0.bf.pad_type = pad_type & 3;
  49         sa->sa_command_0.bf.extend_pad = pad_type >> 2;
  50         sa->sa_command_0.bf.op_group = op_grp;
  51         sa->sa_command_0.bf.opcode = op;
  52         sa->sa_command_0.bf.dir = dir;
  53 }
  54
  55 void set_dynamic_sa_command_1(struct dynamic_sa_ctl *sa, u32 cm, u32 hmac_mc,
  56                               u32 cfb, u32 esn, u32 sn_mask, u32 mute,
  57                               u32 cp_pad, u32 cp_pay, u32 cp_hdr)
  58 {
  59         sa->sa_command_1.w = 0;
  60         sa->sa_command_1.bf.crypto_mode31 = (cm & 4) >> 2;
  61         sa->sa_command_1.bf.crypto_mode9_8 = cm & 3;
  62         sa->sa_command_1.bf.feedback_mode = cfb,
  63         sa->sa_command_1.bf.sa_rev = 1;
  64         sa->sa_command_1.bf.extended_seq_num = esn;
  65         sa->sa_command_1.bf.seq_num_mask = sn_mask;
  66         sa->sa_command_1.bf.mutable_bit_proc = mute;
  67         sa->sa_command_1.bf.copy_pad = cp_pad;
  68         sa->sa_command_1.bf.copy_payload = cp_pay;
  69         sa->sa_command_1.bf.copy_hdr = cp_hdr;
  70 }
  71
  72 int crypto4xx_encrypt(struct ablkcipher_request *req)
  73 {
  74         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
  75
  76         ctx->direction = DIR_OUTBOUND;
  77         ctx->hash_final = 0;
  78         ctx->is_hash = 0;
  79         ctx->pd_ctl = 0x1;
  80
  81         return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
  82                                   req->nbytes, req->info,
  83                                   get_dynamic_sa_iv_size(ctx));
  84 }
  85
  86 int crypto4xx_decrypt(struct ablkcipher_request *req)
  87 {
  88         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
  89
  90         ctx->direction = DIR_INBOUND;
  91         ctx->hash_final = 0;
  92         ctx->is_hash = 0;
  93         ctx->pd_ctl = 1;
  94
  95         return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
  96                                   req->nbytes, req->info,
  97                                   get_dynamic_sa_iv_size(ctx));
  98 }
  99
 100 /**
 101  * AES Functions
 102  */
 103 static int crypto4xx_setkey_aes(struct crypto_ablkcipher *cipher,
 104                                 const u8 *key,
 105                                 unsigned int keylen,
 106                                 unsigned char cm,
 107                                 u8 fb)
 108 {
 109         struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
 110         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
 111         struct dynamic_sa_ctl *sa;
 112         int    rc;
 113
 114         if (keylen != AES_KEYSIZE_256 &&
 115                 keylen != AES_KEYSIZE_192 && keylen != AES_KEYSIZE_128) {
 116                 crypto_ablkcipher_set_flags(cipher,
 117                                 CRYPTO_TFM_RES_BAD_KEY_LEN);
 118                 return -EINVAL;
 119         }
 120
 121         /* Create SA */
 122         if (ctx->sa_in_dma_addr || ctx->sa_out_dma_addr)
 123                 crypto4xx_free_sa(ctx);
 124
 125         rc = crypto4xx_alloc_sa(ctx, SA_AES128_LEN + (keylen-16) / 4);
 126         if (rc)
 127                 return rc;
 128
 129         if (ctx->state_record_dma_addr == 0) {
 130                 rc = crypto4xx_alloc_state_record(ctx);
 131                 if (rc) {
 132                         crypto4xx_free_sa(ctx);
 133                         return rc;
 134                 }
 135         }
 136         /* Setup SA */
 137         sa = (struct dynamic_sa_ctl *) ctx->sa_in;
 138         ctx->hash_final = 0;
 139
 140         set_dynamic_sa_command_0(sa, SA_NOT_SAVE_HASH, SA_NOT_SAVE_IV,
 141                                  SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE,
 142                                  SA_NO_HEADER_PROC, SA_HASH_ALG_NULL,
 143                                  SA_CIPHER_ALG_AES, SA_PAD_TYPE_ZERO,
 144                                  SA_OP_GROUP_BASIC, SA_OPCODE_DECRYPT,
 145                                  DIR_INBOUND);
 146
 147         set_dynamic_sa_command_1(sa, cm, SA_HASH_MODE_HASH,
 148                                  fb, SA_EXTENDED_SN_OFF,
 149                                  SA_SEQ_MASK_OFF, SA_MC_ENABLE,
 150                                  SA_NOT_COPY_PAD, SA_NOT_COPY_PAYLOAD,
 151                                  SA_NOT_COPY_HDR);
 152         crypto4xx_memcpy_le(ctx->sa_in + get_dynamic_sa_offset_key_field(ctx),
 153                             key, keylen);
 154         sa->sa_contents = SA_AES_CONTENTS | (keylen << 2);
 155         sa->sa_command_1.bf.key_len = keylen >> 3;
 156         ctx->is_hash = 0;
 157         ctx->direction = DIR_INBOUND;
 158         memcpy(ctx->sa_in + get_dynamic_sa_offset_state_ptr_field(ctx),
 159                         (void *)&ctx->state_record_dma_addr, 4);
 160         ctx->offset_to_sr_ptr = get_dynamic_sa_offset_state_ptr_field(ctx);
 161
 162         memcpy(ctx->sa_out, ctx->sa_in, ctx->sa_len * 4);
 163         sa = (struct dynamic_sa_ctl *) ctx->sa_out;
 164         sa->sa_command_0.bf.dir = DIR_OUTBOUND;
 165
 166         return 0;
 167 }
 168
 169 int crypto4xx_setkey_aes_cbc(struct crypto_ablkcipher *cipher,
 170                              const u8 *key, unsigned int keylen)
 171 {
 172         return crypto4xx_setkey_aes(cipher, key, keylen, CRYPTO_MODE_CBC,
 173                                     CRYPTO_FEEDBACK_MODE_NO_FB);
 174 }
 175
 176 /**
 177  * HASH SHA1 Functions
 178  */
 179 static int crypto4xx_hash_alg_init(struct crypto_tfm *tfm,
 180                                    unsigned int sa_len,
 181                                    unsigned char ha,
 182                                    unsigned char hm)
 183 {
 184         struct crypto_alg *alg = tfm->__crt_alg;
 185         struct crypto4xx_alg *my_alg = crypto_alg_to_crypto4xx_alg(alg);
 186         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
 187         struct dynamic_sa_ctl *sa;
 188         struct dynamic_sa_hash160 *sa_in;
 189         int rc;
 190
 191         ctx->dev   = my_alg->dev;
 192         ctx->is_hash = 1;
 193         ctx->hash_final = 0;
 194
 195         /* Create SA */
 196         if (ctx->sa_in_dma_addr || ctx->sa_out_dma_addr)
 197                 crypto4xx_free_sa(ctx);
 198
 199         rc = crypto4xx_alloc_sa(ctx, sa_len);
 200         if (rc)
 201                 return rc;
 202
 203         if (ctx->state_record_dma_addr == 0) {
 204                 crypto4xx_alloc_state_record(ctx);
 205                 if (!ctx->state_record_dma_addr) {
 206                         crypto4xx_free_sa(ctx);
 207                         return -ENOMEM;
 208                 }
 209         }
 210
 211         tfm->crt_ahash.reqsize = sizeof(struct crypto4xx_ctx);
 212         sa = (struct dynamic_sa_ctl *) ctx->sa_in;
 213         set_dynamic_sa_command_0(sa, SA_SAVE_HASH, SA_NOT_SAVE_IV,
 214                                  SA_NOT_LOAD_HASH, SA_LOAD_IV_FROM_SA,
 215                                  SA_NO_HEADER_PROC, ha, SA_CIPHER_ALG_NULL,
 216                                  SA_PAD_TYPE_ZERO, SA_OP_GROUP_BASIC,
 217                                  SA_OPCODE_HASH, DIR_INBOUND);
 218         set_dynamic_sa_command_1(sa, 0, SA_HASH_MODE_HASH,
 219                                  CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF,
 220                                  SA_SEQ_MASK_OFF, SA_MC_ENABLE,
 221                                  SA_NOT_COPY_PAD, SA_NOT_COPY_PAYLOAD,
 222                                  SA_NOT_COPY_HDR);
 223         ctx->direction = DIR_INBOUND;
 224         sa->sa_contents = SA_HASH160_CONTENTS;
 225         sa_in = (struct dynamic_sa_hash160 *) ctx->sa_in;
 226         /* Need to zero hash digest in SA */
 227         memset(sa_in->inner_digest, 0, sizeof(sa_in->inner_digest));
 228         memset(sa_in->outer_digest, 0, sizeof(sa_in->outer_digest));
 229         sa_in->state_ptr = ctx->state_record_dma_addr;
 230         ctx->offset_to_sr_ptr = get_dynamic_sa_offset_state_ptr_field(ctx);
 231
 232         return 0;
 233 }
 234
 235 int crypto4xx_hash_init(struct ahash_request *req)
 236 {
 237         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
 238         int ds;
 239         struct dynamic_sa_ctl *sa;
 240
 241         sa = (struct dynamic_sa_ctl *) ctx->sa_in;
 242         ds = crypto_ahash_digestsize(
 243                         __crypto_ahash_cast(req->base.tfm));
 244         sa->sa_command_0.bf.digest_len = ds >> 2;
 245         sa->sa_command_0.bf.load_hash_state = SA_LOAD_HASH_FROM_SA;
 246         ctx->is_hash = 1;
 247         ctx->direction = DIR_INBOUND;
 248
 249         return 0;
 250 }
 251
 252 int crypto4xx_hash_update(struct ahash_request *req)
 253 {
 254         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
 255
 256         ctx->is_hash = 1;
 257         ctx->hash_final = 0;
 258         ctx->pd_ctl = 0x11;
 259         ctx->direction = DIR_INBOUND;
 260
 261         return crypto4xx_build_pd(&req->base, ctx, req->src,
 262                                   (struct scatterlist *) req->result,
 263                                   req->nbytes, NULL, 0);
 264 }
 265
 266 int crypto4xx_hash_final(struct ahash_request *req)
 267 {
 268         return 0;
 269 }
 270
 271 int crypto4xx_hash_digest(struct ahash_request *req)
 272 {
 273         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
 274
 275         ctx->hash_final = 1;
 276         ctx->pd_ctl = 0x11;
 277         ctx->direction = DIR_INBOUND;
 278
 279         return crypto4xx_build_pd(&req->base, ctx, req->src,
 280                                   (struct scatterlist *) req->result,
 281                                   req->nbytes, NULL, 0);
 282 }
 283
 284 /**
 285  * SHA1 Algorithm
 286  */
 287 int crypto4xx_sha1_alg_init(struct crypto_tfm *tfm)
 288 {
 289         return crypto4xx_hash_alg_init(tfm, SA_HASH160_LEN, SA_HASH_ALG_SHA1,
 290                                        SA_HASH_MODE_HASH);
 291 }
 292
 293