drivers/crypto/bcm/spu.h - arm/linux - Git at Google

 /*
  * 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
	/*
	* 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