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 */ spu_req_incl_icv(enum spu_cipher_mode cipher_mode,bool is_encrypt)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 spu_real_db_size(u32 assoc_size,u32 aead_iv_buf_len,u32 prebuf_len,u32 data_size,u32 aad_pad_len,u32 gcm_pad_len,u32 hash_pad_len)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 277