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 static void set_dynamic_sa_command_0(struct dynamic_sa_ctl *sa, u32 save_h,
  36                                      u32 save_iv, u32 ld_h, u32 ld_iv,
  37                                      u32 hdr_proc, u32 h, u32 c, u32 pad_type,
  38                                      u32 op_grp, u32 op, 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 static void set_dynamic_sa_command_1(struct dynamic_sa_ctl *sa, u32 cm,
  56                                      u32 hmac_mc, u32 cfb, u32 esn,
  57                                      u32 sn_mask, u32 mute, u32 cp_pad,
  58                                      u32 cp_pay, u32 cp_hdr)
  59 {
  60         sa->sa_command_1.w = 0;
  61         sa->sa_command_1.bf.crypto_mode31 = (cm & 4) >> 2;
  62         sa->sa_command_1.bf.crypto_mode9_8 = cm & 3;
  63         sa->sa_command_1.bf.feedback_mode = cfb,
  64         sa->sa_command_1.bf.sa_rev = 1;
  65         sa->sa_command_1.bf.extended_seq_num = esn;
  66         sa->sa_command_1.bf.seq_num_mask = sn_mask;
  67         sa->sa_command_1.bf.mutable_bit_proc = mute;
  68         sa->sa_command_1.bf.copy_pad = cp_pad;
  69         sa->sa_command_1.bf.copy_payload = cp_pay;
  70         sa->sa_command_1.bf.copy_hdr = cp_hdr;
  71 }
  72
  73 int crypto4xx_encrypt(struct ablkcipher_request *req)
  74 {
  75         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
  76
  77         ctx->direction = DIR_OUTBOUND;
  78         ctx->hash_final = 0;
  79         ctx->is_hash = 0;
  80         ctx->pd_ctl = 0x1;
  81
  82         return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
  83                                   req->nbytes, req->info,
  84                                   get_dynamic_sa_iv_size(ctx));
  85 }
  86
  87 int crypto4xx_decrypt(struct ablkcipher_request *req)
  88 {
  89         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
  90
  91         ctx->direction = DIR_INBOUND;
  92         ctx->hash_final = 0;
  93         ctx->is_hash = 0;
  94         ctx->pd_ctl = 1;
  95
  96         return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
  97                                   req->nbytes, req->info,
  98                                   get_dynamic_sa_iv_size(ctx));
  99 }
 100
 101 /**
 102  * AES Functions
 103  */
 104 static int crypto4xx_setkey_aes(struct crypto_ablkcipher *cipher,
 105                                 const u8 *key,
 106                                 unsigned int keylen,
 107                                 unsigned char cm,
 108                                 u8 fb)
 109 {
 110         struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
 111         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
 112         struct dynamic_sa_ctl *sa;
 113         int    rc;
 114
 115         if (keylen != AES_KEYSIZE_256 &&
 116                 keylen != AES_KEYSIZE_192 && keylen != AES_KEYSIZE_128) {
 117                 crypto_ablkcipher_set_flags(cipher,
 118                                 CRYPTO_TFM_RES_BAD_KEY_LEN);
 119                 return -EINVAL;
 120         }
 121
 122         /* Create SA */
 123         if (ctx->sa_in_dma_addr || ctx->sa_out_dma_addr)
 124                 crypto4xx_free_sa(ctx);
 125
 126         rc = crypto4xx_alloc_sa(ctx, SA_AES128_LEN + (keylen-16) / 4);
 127         if (rc)
 128                 return rc;
 129
 130         if (ctx->state_record_dma_addr == 0) {
 131                 rc = crypto4xx_alloc_state_record(ctx);
 132                 if (rc) {
 133                         crypto4xx_free_sa(ctx);
 134                         return rc;
 135                 }
 136         }
 137         /* Setup SA */
 138         sa = (struct dynamic_sa_ctl *) ctx->sa_in;
 139         ctx->hash_final = 0;
 140
 141         set_dynamic_sa_command_0(sa, SA_NOT_SAVE_HASH, (cm == CRYPTO_MODE_CBC ?
 142                                  SA_SAVE_IV : SA_NOT_SAVE_IV),
 143                                  SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE,
 144                                  SA_NO_HEADER_PROC, SA_HASH_ALG_NULL,
 145                                  SA_CIPHER_ALG_AES, SA_PAD_TYPE_ZERO,
 146                                  SA_OP_GROUP_BASIC, SA_OPCODE_DECRYPT,
 147                                  DIR_INBOUND);
 148
 149         set_dynamic_sa_command_1(sa, cm, SA_HASH_MODE_HASH,
 150                                  fb, SA_EXTENDED_SN_OFF,
 151                                  SA_SEQ_MASK_OFF, SA_MC_ENABLE,
 152                                  SA_NOT_COPY_PAD, SA_NOT_COPY_PAYLOAD,
 153                                  SA_NOT_COPY_HDR);
 154         crypto4xx_memcpy_le(ctx->sa_in + get_dynamic_sa_offset_key_field(ctx),
 155                             key, keylen);
 156         sa->sa_contents = SA_AES_CONTENTS | (keylen << 2);
 157         sa->sa_command_1.bf.key_len = keylen >> 3;
 158         ctx->is_hash = 0;
 159         ctx->direction = DIR_INBOUND;
 160         memcpy(ctx->sa_in + get_dynamic_sa_offset_state_ptr_field(ctx),
 161                         (void *)&ctx->state_record_dma_addr, 4);
 162         ctx->offset_to_sr_ptr = get_dynamic_sa_offset_state_ptr_field(ctx);
 163
 164         memcpy(ctx->sa_out, ctx->sa_in, ctx->sa_len * 4);
 165         sa = (struct dynamic_sa_ctl *) ctx->sa_out;
 166         sa->sa_command_0.bf.dir = DIR_OUTBOUND;
 167
 168         return 0;
 169 }
 170
 171 int crypto4xx_setkey_aes_cbc(struct crypto_ablkcipher *cipher,
 172                              const u8 *key, unsigned int keylen)
 173 {
 174         return crypto4xx_setkey_aes(cipher, key, keylen, CRYPTO_MODE_CBC,
 175                                     CRYPTO_FEEDBACK_MODE_NO_FB);
 176 }
 177
 178 /**
 179  * HASH SHA1 Functions
 180  */
 181 static int crypto4xx_hash_alg_init(struct crypto_tfm *tfm,
 182                                    unsigned int sa_len,
 183                                    unsigned char ha,
 184                                    unsigned char hm)
 185 {
 186         struct crypto_alg *alg = tfm->__crt_alg;
 187         struct crypto4xx_alg *my_alg = crypto_alg_to_crypto4xx_alg(alg);
 188         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
 189         struct dynamic_sa_ctl *sa;
 190         struct dynamic_sa_hash160 *sa_in;
 191         int rc;
 192
 193         ctx->dev   = my_alg->dev;
 194         ctx->is_hash = 1;
 195         ctx->hash_final = 0;
 196
 197         /* Create SA */
 198         if (ctx->sa_in_dma_addr || ctx->sa_out_dma_addr)
 199                 crypto4xx_free_sa(ctx);
 200
 201         rc = crypto4xx_alloc_sa(ctx, sa_len);
 202         if (rc)
 203                 return rc;
 204
 205         if (ctx->state_record_dma_addr == 0) {
 206                 crypto4xx_alloc_state_record(ctx);
 207                 if (!ctx->state_record_dma_addr) {
 208                         crypto4xx_free_sa(ctx);
 209                         return -ENOMEM;
 210                 }
 211         }
 212
 213         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
 214                                  sizeof(struct crypto4xx_ctx));
 215         sa = (struct dynamic_sa_ctl *) ctx->sa_in;
 216         set_dynamic_sa_command_0(sa, SA_SAVE_HASH, SA_NOT_SAVE_IV,
 217                                  SA_NOT_LOAD_HASH, SA_LOAD_IV_FROM_SA,
 218                                  SA_NO_HEADER_PROC, ha, SA_CIPHER_ALG_NULL,
 219                                  SA_PAD_TYPE_ZERO, SA_OP_GROUP_BASIC,
 220                                  SA_OPCODE_HASH, DIR_INBOUND);
 221         set_dynamic_sa_command_1(sa, 0, SA_HASH_MODE_HASH,
 222                                  CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF,
 223                                  SA_SEQ_MASK_OFF, SA_MC_ENABLE,
 224                                  SA_NOT_COPY_PAD, SA_NOT_COPY_PAYLOAD,
 225                                  SA_NOT_COPY_HDR);
 226         ctx->direction = DIR_INBOUND;
 227         sa->sa_contents = SA_HASH160_CONTENTS;
 228         sa_in = (struct dynamic_sa_hash160 *) ctx->sa_in;
 229         /* Need to zero hash digest in SA */
 230         memset(sa_in->inner_digest, 0, sizeof(sa_in->inner_digest));
 231         memset(sa_in->outer_digest, 0, sizeof(sa_in->outer_digest));
 232         sa_in->state_ptr = ctx->state_record_dma_addr;
 233         ctx->offset_to_sr_ptr = get_dynamic_sa_offset_state_ptr_field(ctx);
 234
 235         return 0;
 236 }
 237
 238 int crypto4xx_hash_init(struct ahash_request *req)
 239 {
 240         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
 241         int ds;
 242         struct dynamic_sa_ctl *sa;
 243
 244         sa = (struct dynamic_sa_ctl *) ctx->sa_in;
 245         ds = crypto_ahash_digestsize(
 246                         __crypto_ahash_cast(req->base.tfm));
 247         sa->sa_command_0.bf.digest_len = ds >> 2;
 248         sa->sa_command_0.bf.load_hash_state = SA_LOAD_HASH_FROM_SA;
 249         ctx->is_hash = 1;
 250         ctx->direction = DIR_INBOUND;
 251
 252         return 0;
 253 }
 254
 255 int crypto4xx_hash_update(struct ahash_request *req)
 256 {
 257         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
 258
 259         ctx->is_hash = 1;
 260         ctx->hash_final = 0;
 261         ctx->pd_ctl = 0x11;
 262         ctx->direction = DIR_INBOUND;
 263
 264         return crypto4xx_build_pd(&req->base, ctx, req->src,
 265                                   (struct scatterlist *) req->result,
 266                                   req->nbytes, NULL, 0);
 267 }
 268
 269 int crypto4xx_hash_final(struct ahash_request *req)
 270 {
 271         return 0;
 272 }
 273
 274 int crypto4xx_hash_digest(struct ahash_request *req)
 275 {
 276         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
 277
 278         ctx->hash_final = 1;
 279         ctx->pd_ctl = 0x11;
 280         ctx->direction = DIR_INBOUND;
 281
 282         return crypto4xx_build_pd(&req->base, ctx, req->src,
 283                                   (struct scatterlist *) req->result,
 284                                   req->nbytes, NULL, 0);
 285 }
 286
 287 /**
 288  * SHA1 Algorithm
 289  */
 290 int crypto4xx_sha1_alg_init(struct crypto_tfm *tfm)
 291 {
 292         return crypto4xx_hash_alg_init(tfm, SA_HASH160_LEN, SA_HASH_ALG_SHA1,
 293                                        SA_HASH_MODE_HASH);
 294 }
 295
 296