drivers/crypto/bcm/spu.h

   1 /*
   2  * Copyright 2016 Broadcom
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License, version 2, as
   6  * published by the Free Software Foundation (the "GPL").
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License version 2 (GPLv2) for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * version 2 (GPLv2) along with this source code.
  15  */
  16
  17 /*
  18  * This file contains the definition of SPU messages. There are currently two
  19  * SPU message formats: SPU-M and SPU2. The hardware uses different values to
  20  * identify the same things in SPU-M vs SPU2. So this file defines values that
  21  * are hardware independent. Software can use these values for any version of
  22  * SPU hardware. These values are used in APIs in spu.c. Functions internal to
  23  * spu.c and spu2.c convert these to hardware-specific values.
  24  */
  25
  26 #ifndef _SPU_H
  27 #define _SPU_H
  28
  29 #include <linux/types.h>
  30 #include <linux/scatterlist.h>
  31 #include <crypto/sha.h>
  32
  33 enum spu_cipher_alg {
  34         CIPHER_ALG_NONE = 0x0,
  35         CIPHER_ALG_RC4 = 0x1,
  36         CIPHER_ALG_DES = 0x2,
  37         CIPHER_ALG_3DES = 0x3,
  38         CIPHER_ALG_AES = 0x4,
  39         CIPHER_ALG_LAST = 0x5
  40 };
  41
  42 enum spu_cipher_mode {
  43         CIPHER_MODE_NONE = 0x0,
  44         CIPHER_MODE_ECB = 0x0,
  45         CIPHER_MODE_CBC = 0x1,
  46         CIPHER_MODE_OFB = 0x2,
  47         CIPHER_MODE_CFB = 0x3,
  48         CIPHER_MODE_CTR = 0x4,
  49         CIPHER_MODE_CCM = 0x5,
  50         CIPHER_MODE_GCM = 0x6,
  51         CIPHER_MODE_XTS = 0x7,
  52         CIPHER_MODE_LAST = 0x8
  53 };
  54
  55 enum spu_cipher_type {
  56         CIPHER_TYPE_NONE = 0x0,
  57         CIPHER_TYPE_DES = 0x0,
  58         CIPHER_TYPE_3DES = 0x0,
  59         CIPHER_TYPE_INIT = 0x0, /* used for ARC4 */
  60         CIPHER_TYPE_AES128 = 0x0,
  61         CIPHER_TYPE_AES192 = 0x1,
  62         CIPHER_TYPE_UPDT = 0x1, /* used for ARC4 */
  63         CIPHER_TYPE_AES256 = 0x2,
  64 };
  65
  66 enum hash_alg {
  67         HASH_ALG_NONE = 0x0,
  68         HASH_ALG_MD5 = 0x1,
  69         HASH_ALG_SHA1 = 0x2,
  70         HASH_ALG_SHA224 = 0x3,
  71         HASH_ALG_SHA256 = 0x4,
  72         HASH_ALG_AES = 0x5,
  73         HASH_ALG_SHA384 = 0x6,
  74         HASH_ALG_SHA512 = 0x7,
  75         /* Keep SHA3 algorithms at the end always */
  76         HASH_ALG_SHA3_224 = 0x8,
  77         HASH_ALG_SHA3_256 = 0x9,
  78         HASH_ALG_SHA3_384 = 0xa,
  79         HASH_ALG_SHA3_512 = 0xb,
  80         HASH_ALG_LAST
  81 };
  82
  83 enum hash_mode {
  84         HASH_MODE_NONE = 0x0,
  85         HASH_MODE_HASH = 0x0,
  86         HASH_MODE_XCBC = 0x0,
  87         HASH_MODE_CMAC = 0x1,
  88         HASH_MODE_CTXT = 0x1,
  89         HASH_MODE_HMAC = 0x2,
  90         HASH_MODE_RABIN = 0x4,
  91         HASH_MODE_FHMAC = 0x6,
  92         HASH_MODE_CCM = 0x5,
  93         HASH_MODE_GCM = 0x6,
  94 };
  95
  96 enum hash_type {
  97         HASH_TYPE_NONE = 0x0,
  98         HASH_TYPE_FULL = 0x0,
  99         HASH_TYPE_INIT = 0x1,
 100         HASH_TYPE_UPDT = 0x2,
 101         HASH_TYPE_FIN = 0x3,
 102         HASH_TYPE_AES128 = 0x0,
 103         HASH_TYPE_AES192 = 0x1,
 104         HASH_TYPE_AES256 = 0x2
 105 };
 106
 107 enum aead_type {
 108         AES_CCM,
 109         AES_GCM,
 110         AUTHENC,
 111         AEAD_TYPE_LAST
 112 };
 113
 114 extern char *hash_alg_name[HASH_ALG_LAST];
 115 extern char *aead_alg_name[AEAD_TYPE_LAST];
 116
 117 struct spu_request_opts {
 118         bool is_inbound;
 119         bool auth_first;
 120         bool is_aead;
 121         bool is_esp;
 122         bool bd_suppress;
 123         bool is_rfc4543;
 124 };
 125
 126 struct spu_cipher_parms {
 127         enum spu_cipher_alg  alg;
 128         enum spu_cipher_mode mode;
 129         enum spu_cipher_type type;
 130         u8                  *key_buf;
 131         u16                  key_len;
 132         /* iv_buf and iv_len include salt, if applicable */
 133         u8                  *iv_buf;
 134         u16                  iv_len;
 135 };
 136
 137 struct spu_hash_parms {
 138         enum hash_alg  alg;
 139         enum hash_mode mode;
 140         enum hash_type type;
 141         u8             digestsize;
 142         u8            *key_buf;
 143         u16            key_len;
 144         u16            prebuf_len;
 145         /* length of hash pad. signed, needs to handle roll-overs */
 146         int            pad_len;
 147 };
 148
 149 struct spu_aead_parms {
 150         u32 assoc_size;
 151         u16 iv_len;      /* length of IV field between assoc data and data */
 152         u8  aad_pad_len; /* For AES GCM/CCM, length of padding after AAD */
 153         u8  data_pad_len;/* For AES GCM/CCM, length of padding after data */
 154         bool return_iv;  /* True if SPU should return an IV */
 155         u32 ret_iv_len;  /* Length in bytes of returned IV */
 156         u32 ret_iv_off;  /* Offset into full IV if partial IV returned */
 157 };
 158
 159 /************** SPU sizes ***************/
 160
 161 #define SPU_RX_STATUS_LEN  4
 162
 163 /* Max length of padding for 4-byte alignment of STATUS field */
 164 #define SPU_STAT_PAD_MAX  4
 165
 166 /* Max length of pad fragment. 4 is for 4-byte alignment of STATUS field */
 167 #define SPU_PAD_LEN_MAX (SPU_GCM_CCM_ALIGN + MAX_HASH_BLOCK_SIZE + \
 168                          SPU_STAT_PAD_MAX)
 169
 170 /* GCM and CCM require 16-byte alignment */
 171 #define SPU_GCM_CCM_ALIGN 16
 172
 173 /* Length up SUPDT field in SPU response message for RC4 */
 174 #define SPU_SUPDT_LEN 260
 175
 176 /* SPU status error codes. These used as common error codes across all
 177  * SPU variants.
 178  */
 179 #define SPU_INVALID_ICV  1
 180
 181 /* Indicates no limit to the length of the payload in a SPU message */
 182 #define SPU_MAX_PAYLOAD_INF  0xFFFFFFFF
 183
 184 /* Size of XTS tweak ("i" parameter), in bytes */
 185 #define SPU_XTS_TWEAK_SIZE 16
 186
 187 /* CCM B_0 field definitions, common for SPU-M and SPU2 */
 188 #define CCM_B0_ADATA            0x40
 189 #define CCM_B0_ADATA_SHIFT         6
 190 #define CCM_B0_M_PRIME          0x38
 191 #define CCM_B0_M_PRIME_SHIFT       3
 192 #define CCM_B0_L_PRIME          0x07
 193 #define CCM_B0_L_PRIME_SHIFT       0
 194 #define CCM_ESP_L_VALUE            4
 195
 196 /**
 197  * spu_req_incl_icv() - Return true if SPU request message should include the
 198  * ICV as a separate buffer.
 199  * @cipher_mode:  the cipher mode being requested
 200  * @is_encrypt:   true if encrypting. false if decrypting.
 201  *
 202  * Return:  true if ICV to be included as separate buffer
 203  */
 204 static __always_inline  bool spu_req_incl_icv(enum spu_cipher_mode cipher_mode,
 205                                               bool is_encrypt)
 206 {
 207         if ((cipher_mode == CIPHER_MODE_GCM) && !is_encrypt)
 208                 return true;
 209         if ((cipher_mode == CIPHER_MODE_CCM) && !is_encrypt)
 210                 return true;
 211
 212         return false;
 213 }
 214
 215 static __always_inline u32 spu_real_db_size(u32 assoc_size,
 216                                             u32 aead_iv_buf_len,
 217                                             u32 prebuf_len,
 218                                             u32 data_size,
 219                                             u32 aad_pad_len,
 220                                             u32 gcm_pad_len,
 221                                             u32 hash_pad_len)
 222 {
 223         return assoc_size + aead_iv_buf_len + prebuf_len + data_size +
 224             aad_pad_len + gcm_pad_len + hash_pad_len;
 225 }
 226
 227 /************** SPU Functions Prototypes **************/
 228
 229 void spum_dump_msg_hdr(u8 *buf, unsigned int buf_len);
 230
 231 u32 spum_ns2_ctx_max_payload(enum spu_cipher_alg cipher_alg,
 232                              enum spu_cipher_mode cipher_mode,
 233                              unsigned int blocksize);
 234 u32 spum_nsp_ctx_max_payload(enum spu_cipher_alg cipher_alg,
 235                              enum spu_cipher_mode cipher_mode,
 236                              unsigned int blocksize);
 237 u32 spum_payload_length(u8 *spu_hdr);
 238 u16 spum_response_hdr_len(u16 auth_key_len, u16 enc_key_len, bool is_hash);
 239 u16 spum_hash_pad_len(enum hash_alg hash_alg, enum hash_mode hash_mode,
 240                       u32 chunksize, u16 hash_block_size);
 241 u32 spum_gcm_ccm_pad_len(enum spu_cipher_mode cipher_mode,
 242                          unsigned int data_size);
 243 u32 spum_assoc_resp_len(enum spu_cipher_mode cipher_mode,
 244                         unsigned int assoc_len, unsigned int iv_len,
 245                         bool is_encrypt);
 246 u8 spum_aead_ivlen(enum spu_cipher_mode cipher_mode, u16 iv_len);
 247 bool spu_req_incl_icv(enum spu_cipher_mode cipher_mode, bool is_encrypt);
 248 enum hash_type spum_hash_type(u32 src_sent);
 249 u32 spum_digest_size(u32 alg_digest_size, enum hash_alg alg,
 250                      enum hash_type htype);
 251
 252 u32 spum_create_request(u8 *spu_hdr,
 253                         struct spu_request_opts *req_opts,
 254                         struct spu_cipher_parms *cipher_parms,
 255                         struct spu_hash_parms *hash_parms,
 256                         struct spu_aead_parms *aead_parms,
 257                         unsigned int data_size);
 258
 259 u16 spum_cipher_req_init(u8 *spu_hdr, struct spu_cipher_parms *cipher_parms);
 260
 261 void spum_cipher_req_finish(u8 *spu_hdr,
 262                             u16 spu_req_hdr_len,
 263                             unsigned int is_inbound,
 264                             struct spu_cipher_parms *cipher_parms,
 265                             bool update_key,
 266                             unsigned int data_size);
 267
 268 void spum_request_pad(u8 *pad_start,
 269                       u32 gcm_padding,
 270                       u32 hash_pad_len,
 271                       enum hash_alg auth_alg,
 272                       enum hash_mode auth_mode,
 273                       unsigned int total_sent, u32 status_padding);
 274
 275 u8 spum_xts_tweak_in_payload(void);
 276 u8 spum_tx_status_len(void);
 277 u8 spum_rx_status_len(void);
 278 int spum_status_process(u8 *statp);
 279
 280 void spum_ccm_update_iv(unsigned int digestsize,
 281                         struct spu_cipher_parms *cipher_parms,
 282                         unsigned int assoclen,
 283                         unsigned int chunksize,
 284                         bool is_encrypt,
 285                         bool is_esp);
 286 u32 spum_wordalign_padlen(u32 data_size);
 287 #endif