drivers/crypto/bcm/spu.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright 2016 Broadcom
   4  */
   5
   6 /*
   7  * This file contains the definition of SPU messages. There are currently two
   8  * SPU message formats: SPU-M and SPU2. The hardware uses different values to
   9  * identify the same things in SPU-M vs SPU2. So this file defines values that
  10  * are hardware independent. Software can use these values for any version of
  11  * SPU hardware. These values are used in APIs in spu.c. Functions internal to
  12  * spu.c and spu2.c convert these to hardware-specific values.
  13  */
  14
  15 #ifndef _SPU_H
  16 #define _SPU_H
  17
  18 #include <linux/types.h>
  19 #include <linux/scatterlist.h>
  20 #include <crypto/sha1.h>
  21 #include <crypto/sha2.h>
  22
  23 enum spu_cipher_alg {
  24         CIPHER_ALG_NONE = 0x0,
  25         CIPHER_ALG_RC4 = 0x1,
  26         CIPHER_ALG_DES = 0x2,
  27         CIPHER_ALG_3DES = 0x3,
  28         CIPHER_ALG_AES = 0x4,
  29         CIPHER_ALG_LAST = 0x5
  30 };
  31
  32 enum spu_cipher_mode {
  33         CIPHER_MODE_NONE = 0x0,
  34         CIPHER_MODE_ECB = 0x0,
  35         CIPHER_MODE_CBC = 0x1,
  36         CIPHER_MODE_OFB = 0x2,
  37         CIPHER_MODE_CFB = 0x3,
  38         CIPHER_MODE_CTR = 0x4,
  39         CIPHER_MODE_CCM = 0x5,
  40         CIPHER_MODE_GCM = 0x6,
  41         CIPHER_MODE_XTS = 0x7,
  42         CIPHER_MODE_LAST = 0x8
  43 };
  44
  45 enum spu_cipher_type {
  46         CIPHER_TYPE_NONE = 0x0,
  47         CIPHER_TYPE_DES = 0x0,
  48         CIPHER_TYPE_3DES = 0x0,
  49         CIPHER_TYPE_INIT = 0x0, /* used for ARC4 */
  50         CIPHER_TYPE_AES128 = 0x0,
  51         CIPHER_TYPE_AES192 = 0x1,
  52         CIPHER_TYPE_UPDT = 0x1, /* used for ARC4 */
  53         CIPHER_TYPE_AES256 = 0x2,
  54 };
  55
  56 enum hash_alg {
  57         HASH_ALG_NONE = 0x0,
  58         HASH_ALG_MD5 = 0x1,
  59         HASH_ALG_SHA1 = 0x2,
  60         HASH_ALG_SHA224 = 0x3,
  61         HASH_ALG_SHA256 = 0x4,
  62         HASH_ALG_AES = 0x5,
  63         HASH_ALG_SHA384 = 0x6,
  64         HASH_ALG_SHA512 = 0x7,
  65         /* Keep SHA3 algorithms at the end always */
  66         HASH_ALG_SHA3_224 = 0x8,
  67         HASH_ALG_SHA3_256 = 0x9,
  68         HASH_ALG_SHA3_384 = 0xa,
  69         HASH_ALG_SHA3_512 = 0xb,
  70         HASH_ALG_LAST
  71 };
  72
  73 enum hash_mode {
  74         HASH_MODE_NONE = 0x0,
  75         HASH_MODE_HASH = 0x0,
  76         HASH_MODE_XCBC = 0x0,
  77         HASH_MODE_CMAC = 0x1,
  78         HASH_MODE_CTXT = 0x1,
  79         HASH_MODE_HMAC = 0x2,
  80         HASH_MODE_RABIN = 0x4,
  81         HASH_MODE_FHMAC = 0x6,
  82         HASH_MODE_CCM = 0x5,
  83         HASH_MODE_GCM = 0x6,
  84 };
  85
  86 enum hash_type {
  87         HASH_TYPE_NONE = 0x0,
  88         HASH_TYPE_FULL = 0x0,
  89         HASH_TYPE_INIT = 0x1,
  90         HASH_TYPE_UPDT = 0x2,
  91         HASH_TYPE_FIN = 0x3,
  92         HASH_TYPE_AES128 = 0x0,
  93         HASH_TYPE_AES192 = 0x1,
  94         HASH_TYPE_AES256 = 0x2
  95 };
  96
  97 enum aead_type {
  98         AES_CCM,
  99         AES_GCM,
 100         AUTHENC,
 101         AEAD_TYPE_LAST
 102 };
 103
 104 extern char *hash_alg_name[HASH_ALG_LAST];
 105 extern char *aead_alg_name[AEAD_TYPE_LAST];
 106
 107 struct spu_request_opts {
 108         bool is_inbound;
 109         bool auth_first;
 110         bool is_aead;
 111         bool is_esp;
 112         bool bd_suppress;
 113         bool is_rfc4543;
 114 };
 115
 116 struct spu_cipher_parms {
 117         enum spu_cipher_alg  alg;
 118         enum spu_cipher_mode mode;
 119         enum spu_cipher_type type;
 120         u8                  *key_buf;
 121         u16                  key_len;
 122         /* iv_buf and iv_len include salt, if applicable */
 123         u8                  *iv_buf;
 124         u16                  iv_len;
 125 };
 126
 127 struct spu_hash_parms {
 128         enum hash_alg  alg;
 129         enum hash_mode mode;
 130         enum hash_type type;
 131         u8             digestsize;
 132         u8            *key_buf;
 133         u16            key_len;
 134         u16            prebuf_len;
 135         /* length of hash pad. signed, needs to handle roll-overs */
 136         int            pad_len;
 137 };
 138
 139 struct spu_aead_parms {
 140         u32 assoc_size;
 141         u16 iv_len;      /* length of IV field between assoc data and data */
 142         u8  aad_pad_len; /* For AES GCM/CCM, length of padding after AAD */
 143         u8  data_pad_len;/* For AES GCM/CCM, length of padding after data */
 144         bool return_iv;  /* True if SPU should return an IV */
 145         u32 ret_iv_len;  /* Length in bytes of returned IV */
 146         u32 ret_iv_off;  /* Offset into full IV if partial IV returned */
 147 };
 148
 149 /************** SPU sizes ***************/
 150
 151 #define SPU_RX_STATUS_LEN  4
 152
 153 /* Max length of padding for 4-byte alignment of STATUS field */
 154 #define SPU_STAT_PAD_MAX  4
 155
 156 /* Max length of pad fragment. 4 is for 4-byte alignment of STATUS field */
 157 #define SPU_PAD_LEN_MAX (SPU_GCM_CCM_ALIGN + MAX_HASH_BLOCK_SIZE + \
 158                          SPU_STAT_PAD_MAX)
 159
 160 /* GCM and CCM require 16-byte alignment */
 161 #define SPU_GCM_CCM_ALIGN 16
 162
 163 /* Length up SUPDT field in SPU response message for RC4 */
 164 #define SPU_SUPDT_LEN 260
 165
 166 /* SPU status error codes. These used as common error codes across all
 167  * SPU variants.
 168  */
 169 #define SPU_INVALID_ICV  1
 170
 171 /* Indicates no limit to the length of the payload in a SPU message */
 172 #define SPU_MAX_PAYLOAD_INF  0xFFFFFFFF
 173
 174 /* Size of XTS tweak ("i" parameter), in bytes */
 175 #define SPU_XTS_TWEAK_SIZE 16
 176
 177 /* CCM B_0 field definitions, common for SPU-M and SPU2 */
 178 #define CCM_B0_ADATA            0x40
 179 #define CCM_B0_ADATA_SHIFT         6
 180 #define CCM_B0_M_PRIME          0x38
 181 #define CCM_B0_M_PRIME_SHIFT       3
 182 #define CCM_B0_L_PRIME          0x07
 183 #define CCM_B0_L_PRIME_SHIFT       0
 184 #define CCM_ESP_L_VALUE            4
 185
 186 /**
 187  * spu_req_incl_icv() - Return true if SPU request message should include the
 188  * ICV as a separate buffer.
 189  * @cipher_mode:  the cipher mode being requested
 190  * @is_encrypt:   true if encrypting. false if decrypting.
 191  *
 192  * Return:  true if ICV to be included as separate buffer
 193  */
 194 static __always_inline  bool spu_req_incl_icv(enum spu_cipher_mode cipher_mode,
 195                                               bool is_encrypt)
 196 {
 197         if ((cipher_mode == CIPHER_MODE_GCM) && !is_encrypt)
 198                 return true;
 199         if ((cipher_mode == CIPHER_MODE_CCM) && !is_encrypt)
 200                 return true;
 201
 202         return false;
 203 }
 204
 205 static __always_inline u32 spu_real_db_size(u32 assoc_size,
 206                                             u32 aead_iv_buf_len,
 207                                             u32 prebuf_len,
 208                                             u32 data_size,
 209                                             u32 aad_pad_len,
 210                                             u32 gcm_pad_len,
 211                                             u32 hash_pad_len)
 212 {
 213         return assoc_size + aead_iv_buf_len + prebuf_len + data_size +
 214             aad_pad_len + gcm_pad_len + hash_pad_len;
 215 }
 216
 217 /************** SPU Functions Prototypes **************/
 218
 219 void spum_dump_msg_hdr(u8 *buf, unsigned int buf_len);
 220
 221 u32 spum_ns2_ctx_max_payload(enum spu_cipher_alg cipher_alg,
 222                              enum spu_cipher_mode cipher_mode,
 223                              unsigned int blocksize);
 224 u32 spum_nsp_ctx_max_payload(enum spu_cipher_alg cipher_alg,
 225                              enum spu_cipher_mode cipher_mode,
 226                              unsigned int blocksize);
 227 u32 spum_payload_length(u8 *spu_hdr);
 228 u16 spum_response_hdr_len(u16 auth_key_len, u16 enc_key_len, bool is_hash);
 229 u16 spum_hash_pad_len(enum hash_alg hash_alg, enum hash_mode hash_mode,
 230                       u32 chunksize, u16 hash_block_size);
 231 u32 spum_gcm_ccm_pad_len(enum spu_cipher_mode cipher_mode,
 232                          unsigned int data_size);
 233 u32 spum_assoc_resp_len(enum spu_cipher_mode cipher_mode,
 234                         unsigned int assoc_len, unsigned int iv_len,
 235                         bool is_encrypt);
 236 u8 spum_aead_ivlen(enum spu_cipher_mode cipher_mode, u16 iv_len);
 237 bool spu_req_incl_icv(enum spu_cipher_mode cipher_mode, bool is_encrypt);
 238 enum hash_type spum_hash_type(u32 src_sent);
 239 u32 spum_digest_size(u32 alg_digest_size, enum hash_alg alg,
 240                      enum hash_type htype);
 241
 242 u32 spum_create_request(u8 *spu_hdr,
 243                         struct spu_request_opts *req_opts,
 244                         struct spu_cipher_parms *cipher_parms,
 245                         struct spu_hash_parms *hash_parms,
 246                         struct spu_aead_parms *aead_parms,
 247                         unsigned int data_size);
 248
 249 u16 spum_cipher_req_init(u8 *spu_hdr, struct spu_cipher_parms *cipher_parms);
 250
 251 void spum_cipher_req_finish(u8 *spu_hdr,
 252                             u16 spu_req_hdr_len,
 253                             unsigned int is_inbound,
 254                             struct spu_cipher_parms *cipher_parms,
 255                             unsigned int data_size);
 256
 257 void spum_request_pad(u8 *pad_start,
 258                       u32 gcm_padding,
 259                       u32 hash_pad_len,
 260                       enum hash_alg auth_alg,
 261                       enum hash_mode auth_mode,
 262                       unsigned int total_sent, u32 status_padding);
 263
 264 u8 spum_xts_tweak_in_payload(void);
 265 u8 spum_tx_status_len(void);
 266 u8 spum_rx_status_len(void);
 267 int spum_status_process(u8 *statp);
 268
 269 void spum_ccm_update_iv(unsigned int digestsize,
 270                         struct spu_cipher_parms *cipher_parms,
 271                         unsigned int assoclen,
 272                         unsigned int chunksize,
 273                         bool is_encrypt,
 274                         bool is_esp);
 275 u32 spum_wordalign_padlen(u32 data_size);
 276 #endif