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Diffstat (limited to 'drivers/crypto/bcm/spu.h')
| -rw-r--r-- | drivers/crypto/bcm/spu.h | 287 |
1 files changed, 287 insertions, 0 deletions
diff --git a/drivers/crypto/bcm/spu.h b/drivers/crypto/bcm/spu.h new file mode 100644 index 000000000000..aa6fc38db263 --- /dev/null +++ b/drivers/crypto/bcm/spu.h @@ -0,0 +1,287 @@ +/* + * Copyright 2016 Broadcom + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation (the "GPL"). + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License version 2 (GPLv2) for more details. + * + * You should have received a copy of the GNU General Public License + * version 2 (GPLv2) along with this source code. + */ + +/* + * This file contains the definition of SPU messages. There are currently two + * SPU message formats: SPU-M and SPU2. The hardware uses different values to + * identify the same things in SPU-M vs SPU2. So this file defines values that + * are hardware independent. Software can use these values for any version of + * SPU hardware. These values are used in APIs in spu.c. Functions internal to + * spu.c and spu2.c convert these to hardware-specific values. + */ + +#ifndef _SPU_H +#define _SPU_H + +#include <linux/types.h> +#include <linux/scatterlist.h> +#include <crypto/sha.h> + +enum spu_cipher_alg { + CIPHER_ALG_NONE = 0x0, + CIPHER_ALG_RC4 = 0x1, + CIPHER_ALG_DES = 0x2, + CIPHER_ALG_3DES = 0x3, + CIPHER_ALG_AES = 0x4, + CIPHER_ALG_LAST = 0x5 +}; + +enum spu_cipher_mode { + CIPHER_MODE_NONE = 0x0, + CIPHER_MODE_ECB = 0x0, + CIPHER_MODE_CBC = 0x1, + CIPHER_MODE_OFB = 0x2, + CIPHER_MODE_CFB = 0x3, + CIPHER_MODE_CTR = 0x4, + CIPHER_MODE_CCM = 0x5, + CIPHER_MODE_GCM = 0x6, + CIPHER_MODE_XTS = 0x7, + CIPHER_MODE_LAST = 0x8 +}; + +enum spu_cipher_type { + CIPHER_TYPE_NONE = 0x0, + CIPHER_TYPE_DES = 0x0, + CIPHER_TYPE_3DES = 0x0, + CIPHER_TYPE_INIT = 0x0, /* used for ARC4 */ + CIPHER_TYPE_AES128 = 0x0, + CIPHER_TYPE_AES192 = 0x1, + CIPHER_TYPE_UPDT = 0x1, /* used for ARC4 */ + CIPHER_TYPE_AES256 = 0x2, +}; + +enum hash_alg { + HASH_ALG_NONE = 0x0, + HASH_ALG_MD5 = 0x1, + HASH_ALG_SHA1 = 0x2, + HASH_ALG_SHA224 = 0x3, + HASH_ALG_SHA256 = 0x4, + HASH_ALG_AES = 0x5, + HASH_ALG_SHA384 = 0x6, + HASH_ALG_SHA512 = 0x7, + /* Keep SHA3 algorithms at the end always */ + HASH_ALG_SHA3_224 = 0x8, + HASH_ALG_SHA3_256 = 0x9, + HASH_ALG_SHA3_384 = 0xa, + HASH_ALG_SHA3_512 = 0xb, + HASH_ALG_LAST +}; + +enum hash_mode { + HASH_MODE_NONE = 0x0, + HASH_MODE_HASH = 0x0, + HASH_MODE_XCBC = 0x0, + HASH_MODE_CMAC = 0x1, + HASH_MODE_CTXT = 0x1, + HASH_MODE_HMAC = 0x2, + HASH_MODE_RABIN = 0x4, + HASH_MODE_FHMAC = 0x6, + HASH_MODE_CCM = 0x5, + HASH_MODE_GCM = 0x6, +}; + +enum hash_type { + HASH_TYPE_NONE = 0x0, + HASH_TYPE_FULL = 0x0, + HASH_TYPE_INIT = 0x1, + HASH_TYPE_UPDT = 0x2, + HASH_TYPE_FIN = 0x3, + HASH_TYPE_AES128 = 0x0, + HASH_TYPE_AES192 = 0x1, + HASH_TYPE_AES256 = 0x2 +}; + +enum aead_type { + AES_CCM, + AES_GCM, + AUTHENC, + AEAD_TYPE_LAST +}; + +extern char *hash_alg_name[HASH_ALG_LAST]; +extern char *aead_alg_name[AEAD_TYPE_LAST]; + +struct spu_request_opts { + bool is_inbound; + bool auth_first; + bool is_aead; + bool is_esp; + bool bd_suppress; + bool is_rfc4543; +}; + +struct spu_cipher_parms { + enum spu_cipher_alg alg; + enum spu_cipher_mode mode; + enum spu_cipher_type type; + u8 *key_buf; + u16 key_len; + /* iv_buf and iv_len include salt, if applicable */ + u8 *iv_buf; + u16 iv_len; +}; + +struct spu_hash_parms { + enum hash_alg alg; + enum hash_mode mode; + enum hash_type type; + u8 digestsize; + u8 *key_buf; + u16 key_len; + u16 prebuf_len; + /* length of hash pad. signed, needs to handle roll-overs */ + int pad_len; +}; + +struct spu_aead_parms { + u32 assoc_size; + u16 iv_len; /* length of IV field between assoc data and data */ + u8 aad_pad_len; /* For AES GCM/CCM, length of padding after AAD */ + u8 data_pad_len;/* For AES GCM/CCM, length of padding after data */ + bool return_iv; /* True if SPU should return an IV */ + u32 ret_iv_len; /* Length in bytes of returned IV */ + u32 ret_iv_off; /* Offset into full IV if partial IV returned */ +}; + +/************** SPU sizes ***************/ + +#define SPU_RX_STATUS_LEN 4 + +/* Max length of padding for 4-byte alignment of STATUS field */ +#define SPU_STAT_PAD_MAX 4 + +/* Max length of pad fragment. 4 is for 4-byte alignment of STATUS field */ +#define SPU_PAD_LEN_MAX (SPU_GCM_CCM_ALIGN + MAX_HASH_BLOCK_SIZE + \ + SPU_STAT_PAD_MAX) + +/* GCM and CCM require 16-byte alignment */ +#define SPU_GCM_CCM_ALIGN 16 + +/* Length up SUPDT field in SPU response message for RC4 */ +#define SPU_SUPDT_LEN 260 + +/* SPU status error codes. These used as common error codes across all + * SPU variants. + */ +#define SPU_INVALID_ICV 1 + +/* Indicates no limit to the length of the payload in a SPU message */ +#define SPU_MAX_PAYLOAD_INF 0xFFFFFFFF + +/* Size of XTS tweak ("i" parameter), in bytes */ +#define SPU_XTS_TWEAK_SIZE 16 + +/* CCM B_0 field definitions, common for SPU-M and SPU2 */ +#define CCM_B0_ADATA 0x40 +#define CCM_B0_ADATA_SHIFT 6 +#define CCM_B0_M_PRIME 0x38 +#define CCM_B0_M_PRIME_SHIFT 3 +#define CCM_B0_L_PRIME 0x07 +#define CCM_B0_L_PRIME_SHIFT 0 +#define CCM_ESP_L_VALUE 4 + +/** + * spu_req_incl_icv() - Return true if SPU request message should include the + * ICV as a separate buffer. + * @cipher_mode: the cipher mode being requested + * @is_encrypt: true if encrypting. false if decrypting. + * + * Return: true if ICV to be included as separate buffer + */ +static __always_inline bool spu_req_incl_icv(enum spu_cipher_mode cipher_mode, + bool is_encrypt) +{ + if ((cipher_mode == CIPHER_MODE_GCM) && !is_encrypt) + return true; + if ((cipher_mode == CIPHER_MODE_CCM) && !is_encrypt) + return true; + + return false; +} + +static __always_inline u32 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) +{ + return assoc_size + aead_iv_buf_len + prebuf_len + data_size + + aad_pad_len + gcm_pad_len + hash_pad_len; +} + +/************** SPU Functions Prototypes **************/ + +void spum_dump_msg_hdr(u8 *buf, unsigned int buf_len); + +u32 spum_ns2_ctx_max_payload(enum spu_cipher_alg cipher_alg, + enum spu_cipher_mode cipher_mode, + unsigned int blocksize); +u32 spum_nsp_ctx_max_payload(enum spu_cipher_alg cipher_alg, + enum spu_cipher_mode cipher_mode, + unsigned int blocksize); +u32 spum_payload_length(u8 *spu_hdr); +u16 spum_response_hdr_len(u16 auth_key_len, u16 enc_key_len, bool is_hash); +u16 spum_hash_pad_len(enum hash_alg hash_alg, enum hash_mode hash_mode, + u32 chunksize, u16 hash_block_size); +u32 spum_gcm_ccm_pad_len(enum spu_cipher_mode cipher_mode, + unsigned int data_size); +u32 spum_assoc_resp_len(enum spu_cipher_mode cipher_mode, + unsigned int assoc_len, unsigned int iv_len, + bool is_encrypt); +u8 spum_aead_ivlen(enum spu_cipher_mode cipher_mode, u16 iv_len); +bool spu_req_incl_icv(enum spu_cipher_mode cipher_mode, bool is_encrypt); +enum hash_type spum_hash_type(u32 src_sent); +u32 spum_digest_size(u32 alg_digest_size, enum hash_alg alg, + enum hash_type htype); + +u32 spum_create_request(u8 *spu_hdr, + struct spu_request_opts *req_opts, + struct spu_cipher_parms *cipher_parms, + struct spu_hash_parms *hash_parms, + struct spu_aead_parms *aead_parms, + unsigned int data_size); + +u16 spum_cipher_req_init(u8 *spu_hdr, struct spu_cipher_parms *cipher_parms); + +void spum_cipher_req_finish(u8 *spu_hdr, + u16 spu_req_hdr_len, + unsigned int is_inbound, + struct spu_cipher_parms *cipher_parms, + bool update_key, + unsigned int data_size); + +void spum_request_pad(u8 *pad_start, + u32 gcm_padding, + u32 hash_pad_len, + enum hash_alg auth_alg, + enum hash_mode auth_mode, + unsigned int total_sent, u32 status_padding); + +u8 spum_xts_tweak_in_payload(void); +u8 spum_tx_status_len(void); +u8 spum_rx_status_len(void); +int spum_status_process(u8 *statp); + +void spum_ccm_update_iv(unsigned int digestsize, + struct spu_cipher_parms *cipher_parms, + unsigned int assoclen, + unsigned int chunksize, + bool is_encrypt, + bool is_esp); +u32 spum_wordalign_padlen(u32 data_size); +#endif |