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linux-next/include/linux/ccp.h
Tom Lendacky c9f21cb638 crypto: ccp - Check for CCP before registering crypto algs 
If the ccp is built as a built-in module, then ccp-crypto (whether
built as a module or a built-in module) will be able to load and
it will register its crypto algorithms.  If the system does not have
a CCP this will result in -ENODEV being returned whenever a command
is attempted to be queued by the registered crypto algorithms.

Add an API, ccp_present(), that checks for the presence of a CCP
on the system.  The ccp-crypto module can use this to determine if it
should register it's crypto alogorithms.

Cc: stable@vger.kernel.org
Reported-by: Scot Doyle <lkml14@scotdoyle.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Tested-by: Scot Doyle <lkml14@scotdoyle.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-09-24 14:23:34 +08:00

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/*
* AMD Cryptographic Coprocessor (CCP) driver
*
* Copyright (C) 2013 Advanced Micro Devices, Inc.
*
* Author: Tom Lendacky <thomas.lendacky@amd.com>
*
* 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.
*/
#ifndef __CPP_H__
#define __CPP_H__
#include <linux/scatterlist.h>
#include <linux/workqueue.h>
#include <linux/list.h>
#include <crypto/aes.h>
#include <crypto/sha.h>
struct ccp_device;
struct ccp_cmd;
#if defined(CONFIG_CRYPTO_DEV_CCP_DD) || \
defined(CONFIG_CRYPTO_DEV_CCP_DD_MODULE)
/**
* ccp_present - check if a CCP device is present
*
* Returns zero if a CCP device is present, -ENODEV otherwise.
*/
int ccp_present(void);
/**
* ccp_enqueue_cmd - queue an operation for processing by the CCP
*
* @cmd: ccp_cmd struct to be processed
*
* Refer to the ccp_cmd struct below for required fields.
*
* Queue a cmd to be processed by the CCP. If queueing the cmd
* would exceed the defined length of the cmd queue the cmd will
* only be queued if the CCP_CMD_MAY_BACKLOG flag is set and will
* result in a return code of -EBUSY.
*
* The callback routine specified in the ccp_cmd struct will be
* called to notify the caller of completion (if the cmd was not
* backlogged) or advancement out of the backlog. If the cmd has
* advanced out of the backlog the "err" value of the callback
* will be -EINPROGRESS. Any other "err" value during callback is
* the result of the operation.
*
* The cmd has been successfully queued if:
* the return code is -EINPROGRESS or
* the return code is -EBUSY and CCP_CMD_MAY_BACKLOG flag is set
*/
int ccp_enqueue_cmd(struct ccp_cmd *cmd);
#else /* CONFIG_CRYPTO_DEV_CCP_DD is not enabled */
static inline int ccp_present(void)
{
return -ENODEV;
}
static inline int ccp_enqueue_cmd(struct ccp_cmd *cmd)
{
return -ENODEV;
}
#endif /* CONFIG_CRYPTO_DEV_CCP_DD */
/***** AES engine *****/
/**
* ccp_aes_type - AES key size
*
* @CCP_AES_TYPE_128: 128-bit key
* @CCP_AES_TYPE_192: 192-bit key
* @CCP_AES_TYPE_256: 256-bit key
*/
enum ccp_aes_type {
CCP_AES_TYPE_128 = 0,
CCP_AES_TYPE_192,
CCP_AES_TYPE_256,
CCP_AES_TYPE__LAST,
};
/**
* ccp_aes_mode - AES operation mode
*
* @CCP_AES_MODE_ECB: ECB mode
* @CCP_AES_MODE_CBC: CBC mode
* @CCP_AES_MODE_OFB: OFB mode
* @CCP_AES_MODE_CFB: CFB mode
* @CCP_AES_MODE_CTR: CTR mode
* @CCP_AES_MODE_CMAC: CMAC mode
*/
enum ccp_aes_mode {
CCP_AES_MODE_ECB = 0,
CCP_AES_MODE_CBC,
CCP_AES_MODE_OFB,
CCP_AES_MODE_CFB,
CCP_AES_MODE_CTR,
CCP_AES_MODE_CMAC,
CCP_AES_MODE__LAST,
};
/**
* ccp_aes_mode - AES operation mode
*
* @CCP_AES_ACTION_DECRYPT: AES decrypt operation
* @CCP_AES_ACTION_ENCRYPT: AES encrypt operation
*/
enum ccp_aes_action {
CCP_AES_ACTION_DECRYPT = 0,
CCP_AES_ACTION_ENCRYPT,
CCP_AES_ACTION__LAST,
};
/**
* struct ccp_aes_engine - CCP AES operation
* @type: AES operation key size
* @mode: AES operation mode
* @action: AES operation (decrypt/encrypt)
* @key: key to be used for this AES operation
* @key_len: length in bytes of key
* @iv: IV to be used for this AES operation
* @iv_len: length in bytes of iv
* @src: data to be used for this operation
* @dst: data produced by this operation
* @src_len: length in bytes of data used for this operation
* @cmac_final: indicates final operation when running in CMAC mode
* @cmac_key: K1/K2 key used in final CMAC operation
* @cmac_key_len: length in bytes of cmac_key
*
* Variables required to be set when calling ccp_enqueue_cmd():
* - type, mode, action, key, key_len, src, dst, src_len
* - iv, iv_len for any mode other than ECB
* - cmac_final for CMAC mode
* - cmac_key, cmac_key_len for CMAC mode if cmac_final is non-zero
*
* The iv variable is used as both input and output. On completion of the
* AES operation the new IV overwrites the old IV.
*/
struct ccp_aes_engine {
enum ccp_aes_type type;
enum ccp_aes_mode mode;
enum ccp_aes_action action;
struct scatterlist *key;
u32 key_len; /* In bytes */
struct scatterlist *iv;
u32 iv_len; /* In bytes */
struct scatterlist *src, *dst;
u64 src_len; /* In bytes */
u32 cmac_final; /* Indicates final cmac cmd */
struct scatterlist *cmac_key; /* K1/K2 cmac key required for
* final cmac cmd */
u32 cmac_key_len; /* In bytes */
};
/***** XTS-AES engine *****/
/**
* ccp_xts_aes_unit_size - XTS unit size
*
* @CCP_XTS_AES_UNIT_SIZE_16: Unit size of 16 bytes
* @CCP_XTS_AES_UNIT_SIZE_512: Unit size of 512 bytes
* @CCP_XTS_AES_UNIT_SIZE_1024: Unit size of 1024 bytes
* @CCP_XTS_AES_UNIT_SIZE_2048: Unit size of 2048 bytes
* @CCP_XTS_AES_UNIT_SIZE_4096: Unit size of 4096 bytes
*/
enum ccp_xts_aes_unit_size {
CCP_XTS_AES_UNIT_SIZE_16 = 0,
CCP_XTS_AES_UNIT_SIZE_512,
CCP_XTS_AES_UNIT_SIZE_1024,
CCP_XTS_AES_UNIT_SIZE_2048,
CCP_XTS_AES_UNIT_SIZE_4096,
CCP_XTS_AES_UNIT_SIZE__LAST,
};
/**
* struct ccp_xts_aes_engine - CCP XTS AES operation
* @action: AES operation (decrypt/encrypt)
* @unit_size: unit size of the XTS operation
* @key: key to be used for this XTS AES operation
* @key_len: length in bytes of key
* @iv: IV to be used for this XTS AES operation
* @iv_len: length in bytes of iv
* @src: data to be used for this operation
* @dst: data produced by this operation
* @src_len: length in bytes of data used for this operation
* @final: indicates final XTS operation
*
* Variables required to be set when calling ccp_enqueue_cmd():
* - action, unit_size, key, key_len, iv, iv_len, src, dst, src_len, final
*
* The iv variable is used as both input and output. On completion of the
* AES operation the new IV overwrites the old IV.
*/
struct ccp_xts_aes_engine {
enum ccp_aes_action action;
enum ccp_xts_aes_unit_size unit_size;
struct scatterlist *key;
u32 key_len; /* In bytes */
struct scatterlist *iv;
u32 iv_len; /* In bytes */
struct scatterlist *src, *dst;
u64 src_len; /* In bytes */
u32 final;
};
/***** SHA engine *****/
#define CCP_SHA_BLOCKSIZE SHA256_BLOCK_SIZE
#define CCP_SHA_CTXSIZE SHA256_DIGEST_SIZE
/**
* ccp_sha_type - type of SHA operation
*
* @CCP_SHA_TYPE_1: SHA-1 operation
* @CCP_SHA_TYPE_224: SHA-224 operation
* @CCP_SHA_TYPE_256: SHA-256 operation
*/
enum ccp_sha_type {
CCP_SHA_TYPE_1 = 1,
CCP_SHA_TYPE_224,
CCP_SHA_TYPE_256,
CCP_SHA_TYPE__LAST,
};
/**
* struct ccp_sha_engine - CCP SHA operation
* @type: Type of SHA operation
* @ctx: current hash value
* @ctx_len: length in bytes of hash value
* @src: data to be used for this operation
* @src_len: length in bytes of data used for this operation
* @opad: data to be used for final HMAC operation
* @opad_len: length in bytes of data used for final HMAC operation
* @first: indicates first SHA operation
* @final: indicates final SHA operation
* @msg_bits: total length of the message in bits used in final SHA operation
*
* Variables required to be set when calling ccp_enqueue_cmd():
* - type, ctx, ctx_len, src, src_len, final
* - msg_bits if final is non-zero
*
* The ctx variable is used as both input and output. On completion of the
* SHA operation the new hash value overwrites the old hash value.
*/
struct ccp_sha_engine {
enum ccp_sha_type type;
struct scatterlist *ctx;
u32 ctx_len; /* In bytes */
struct scatterlist *src;
u64 src_len; /* In bytes */
struct scatterlist *opad;
u32 opad_len; /* In bytes */
u32 first; /* Indicates first sha cmd */
u32 final; /* Indicates final sha cmd */
u64 msg_bits; /* Message length in bits required for
* final sha cmd */
};
/***** RSA engine *****/
/**
* struct ccp_rsa_engine - CCP RSA operation
* @key_size: length in bits of RSA key
* @exp: RSA exponent
* @exp_len: length in bytes of exponent
* @mod: RSA modulus
* @mod_len: length in bytes of modulus
* @src: data to be used for this operation
* @dst: data produced by this operation
* @src_len: length in bytes of data used for this operation
*
* Variables required to be set when calling ccp_enqueue_cmd():
* - key_size, exp, exp_len, mod, mod_len, src, dst, src_len
*/
struct ccp_rsa_engine {
u32 key_size; /* In bits */
struct scatterlist *exp;
u32 exp_len; /* In bytes */
struct scatterlist *mod;
u32 mod_len; /* In bytes */
struct scatterlist *src, *dst;
u32 src_len; /* In bytes */
};
/***** Passthru engine *****/
/**
* ccp_passthru_bitwise - type of bitwise passthru operation
*
* @CCP_PASSTHRU_BITWISE_NOOP: no bitwise operation performed
* @CCP_PASSTHRU_BITWISE_AND: perform bitwise AND of src with mask
* @CCP_PASSTHRU_BITWISE_OR: perform bitwise OR of src with mask
* @CCP_PASSTHRU_BITWISE_XOR: perform bitwise XOR of src with mask
* @CCP_PASSTHRU_BITWISE_MASK: overwrite with mask
*/
enum ccp_passthru_bitwise {
CCP_PASSTHRU_BITWISE_NOOP = 0,
CCP_PASSTHRU_BITWISE_AND,
CCP_PASSTHRU_BITWISE_OR,
CCP_PASSTHRU_BITWISE_XOR,
CCP_PASSTHRU_BITWISE_MASK,
CCP_PASSTHRU_BITWISE__LAST,
};
/**
* ccp_passthru_byteswap - type of byteswap passthru operation
*
* @CCP_PASSTHRU_BYTESWAP_NOOP: no byte swapping performed
* @CCP_PASSTHRU_BYTESWAP_32BIT: swap bytes within 32-bit words
* @CCP_PASSTHRU_BYTESWAP_256BIT: swap bytes within 256-bit words
*/
enum ccp_passthru_byteswap {
CCP_PASSTHRU_BYTESWAP_NOOP = 0,
CCP_PASSTHRU_BYTESWAP_32BIT,
CCP_PASSTHRU_BYTESWAP_256BIT,
CCP_PASSTHRU_BYTESWAP__LAST,
};
/**
* struct ccp_passthru_engine - CCP pass-through operation
* @bit_mod: bitwise operation to perform
* @byte_swap: byteswap operation to perform
* @mask: mask to be applied to data
* @mask_len: length in bytes of mask
* @src: data to be used for this operation
* @dst: data produced by this operation
* @src_len: length in bytes of data used for this operation
* @final: indicate final pass-through operation
*
* Variables required to be set when calling ccp_enqueue_cmd():
* - bit_mod, byte_swap, src, dst, src_len
* - mask, mask_len if bit_mod is not CCP_PASSTHRU_BITWISE_NOOP
*/
struct ccp_passthru_engine {
enum ccp_passthru_bitwise bit_mod;
enum ccp_passthru_byteswap byte_swap;
struct scatterlist *mask;
u32 mask_len; /* In bytes */
struct scatterlist *src, *dst;
u64 src_len; /* In bytes */
u32 final;
};
/***** ECC engine *****/
#define CCP_ECC_MODULUS_BYTES 48 /* 384-bits */
#define CCP_ECC_MAX_OPERANDS 6
#define CCP_ECC_MAX_OUTPUTS 3
/**
* ccp_ecc_function - type of ECC function
*
* @CCP_ECC_FUNCTION_MMUL_384BIT: 384-bit modular multiplication
* @CCP_ECC_FUNCTION_MADD_384BIT: 384-bit modular addition
* @CCP_ECC_FUNCTION_MINV_384BIT: 384-bit multiplicative inverse
* @CCP_ECC_FUNCTION_PADD_384BIT: 384-bit point addition
* @CCP_ECC_FUNCTION_PMUL_384BIT: 384-bit point multiplication
* @CCP_ECC_FUNCTION_PDBL_384BIT: 384-bit point doubling
*/
enum ccp_ecc_function {
CCP_ECC_FUNCTION_MMUL_384BIT = 0,
CCP_ECC_FUNCTION_MADD_384BIT,
CCP_ECC_FUNCTION_MINV_384BIT,
CCP_ECC_FUNCTION_PADD_384BIT,
CCP_ECC_FUNCTION_PMUL_384BIT,
CCP_ECC_FUNCTION_PDBL_384BIT,
};
/**
* struct ccp_ecc_modular_math - CCP ECC modular math parameters
* @operand_1: first operand for the modular math operation
* @operand_1_len: length of the first operand
* @operand_2: second operand for the modular math operation
* (not used for CCP_ECC_FUNCTION_MINV_384BIT)
* @operand_2_len: length of the second operand
* (not used for CCP_ECC_FUNCTION_MINV_384BIT)
* @result: result of the modular math operation
* @result_len: length of the supplied result buffer
*/
struct ccp_ecc_modular_math {
struct scatterlist *operand_1;
unsigned int operand_1_len; /* In bytes */
struct scatterlist *operand_2;
unsigned int operand_2_len; /* In bytes */
struct scatterlist *result;
unsigned int result_len; /* In bytes */
};
/**
* struct ccp_ecc_point - CCP ECC point definition
* @x: the x coordinate of the ECC point
* @x_len: the length of the x coordinate
* @y: the y coordinate of the ECC point
* @y_len: the length of the y coordinate
*/
struct ccp_ecc_point {
struct scatterlist *x;
unsigned int x_len; /* In bytes */
struct scatterlist *y;
unsigned int y_len; /* In bytes */
};
/**
* struct ccp_ecc_point_math - CCP ECC point math parameters
* @point_1: the first point of the ECC point math operation
* @point_2: the second point of the ECC point math operation
* (only used for CCP_ECC_FUNCTION_PADD_384BIT)
* @domain_a: the a parameter of the ECC curve
* @domain_a_len: the length of the a parameter
* @scalar: the scalar parameter for the point match operation
* (only used for CCP_ECC_FUNCTION_PMUL_384BIT)
* @scalar_len: the length of the scalar parameter
* (only used for CCP_ECC_FUNCTION_PMUL_384BIT)
* @result: the point resulting from the point math operation
*/
struct ccp_ecc_point_math {
struct ccp_ecc_point point_1;
struct ccp_ecc_point point_2;
struct scatterlist *domain_a;
unsigned int domain_a_len; /* In bytes */
struct scatterlist *scalar;
unsigned int scalar_len; /* In bytes */
struct ccp_ecc_point result;
};
/**
* struct ccp_ecc_engine - CCP ECC operation
* @function: ECC function to perform
* @mod: ECC modulus
* @mod_len: length in bytes of modulus
* @mm: module math parameters
* @pm: point math parameters
* @ecc_result: result of the ECC operation
*
* Variables required to be set when calling ccp_enqueue_cmd():
* - function, mod, mod_len
* - operand, operand_len, operand_count, output, output_len, output_count
* - ecc_result
*/
struct ccp_ecc_engine {
enum ccp_ecc_function function;
struct scatterlist *mod;
u32 mod_len; /* In bytes */
union {
struct ccp_ecc_modular_math mm;
struct ccp_ecc_point_math pm;
} u;
u16 ecc_result;
};
/**
* ccp_engine - CCP operation identifiers
*
* @CCP_ENGINE_AES: AES operation
* @CCP_ENGINE_XTS_AES: 128-bit XTS AES operation
* @CCP_ENGINE_RSVD1: unused
* @CCP_ENGINE_SHA: SHA operation
* @CCP_ENGINE_RSA: RSA operation
* @CCP_ENGINE_PASSTHRU: pass-through operation
* @CCP_ENGINE_ZLIB_DECOMPRESS: unused
* @CCP_ENGINE_ECC: ECC operation
*/
enum ccp_engine {
CCP_ENGINE_AES = 0,
CCP_ENGINE_XTS_AES_128,
CCP_ENGINE_RSVD1,
CCP_ENGINE_SHA,
CCP_ENGINE_RSA,
CCP_ENGINE_PASSTHRU,
CCP_ENGINE_ZLIB_DECOMPRESS,
CCP_ENGINE_ECC,
CCP_ENGINE__LAST,
};
/* Flag values for flags member of ccp_cmd */
#define CCP_CMD_MAY_BACKLOG 0x00000001
/**
* struct ccp_cmd - CPP operation request
* @entry: list element (ccp driver use only)
* @work: work element used for callbacks (ccp driver use only)
* @ccp: CCP device to be run on (ccp driver use only)
* @ret: operation return code (ccp driver use only)
* @flags: cmd processing flags
* @engine: CCP operation to perform
* @engine_error: CCP engine return code
* @u: engine specific structures, refer to specific engine struct below
* @callback: operation completion callback function
* @data: parameter value to be supplied to the callback function
*
* Variables required to be set when calling ccp_enqueue_cmd():
* - engine, callback
* - See the operation structures below for what is required for each
* operation.
*/
struct ccp_cmd {
/* The list_head, work_struct, ccp and ret variables are for use
* by the CCP driver only.
*/
struct list_head entry;
struct work_struct work;
struct ccp_device *ccp;
int ret;
u32 flags;
enum ccp_engine engine;
u32 engine_error;
union {
struct ccp_aes_engine aes;
struct ccp_xts_aes_engine xts;
struct ccp_sha_engine sha;
struct ccp_rsa_engine rsa;
struct ccp_passthru_engine passthru;
struct ccp_ecc_engine ecc;
} u;
/* Completion callback support */
void (*callback)(void *data, int err);
void *data;
};
#endif
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