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/*
* AMD Cryptographic Coprocessor (CCP) crypto API support
*
* 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 __CCP_CRYPTO_H__
#define __CCP_CRYPTO_H__
#include <linux/list.h>
#include <linux/wait.h>
#include <linux/pci.h>
#include <linux/ccp.h>
#include <linux/crypto.h>
#include <crypto/algapi.h>
#include <crypto/aes.h>
#include <crypto/ctr.h>
#include <crypto/hash.h>
#include <crypto/sha.h>
#define CCP_CRA_PRIORITY 300
struct ccp_crypto_ablkcipher_alg {
struct list_head entry;
u32 mode;
struct crypto_alg alg;
};
struct ccp_crypto_ahash_alg {
struct list_head entry;
const __be32 *init;
u32 type;
u32 mode;
/* Child algorithm used for HMAC, CMAC, etc */
char child_alg[CRYPTO_MAX_ALG_NAME];
struct ahash_alg alg;
};
static inline struct ccp_crypto_ablkcipher_alg *
ccp_crypto_ablkcipher_alg(struct crypto_tfm *tfm)
{
struct crypto_alg *alg = tfm->__crt_alg;
return container_of(alg, struct ccp_crypto_ablkcipher_alg, alg);
}
static inline struct ccp_crypto_ahash_alg *
ccp_crypto_ahash_alg(struct crypto_tfm *tfm)
{
struct crypto_alg *alg = tfm->__crt_alg;
struct ahash_alg *ahash_alg;
ahash_alg = container_of(alg, struct ahash_alg, halg.base);
return container_of(ahash_alg, struct ccp_crypto_ahash_alg, alg);
}
/***** AES related defines *****/
struct ccp_aes_ctx {
/* Fallback cipher for XTS with unsupported unit sizes */
struct crypto_ablkcipher *tfm_ablkcipher;
/* Cipher used to generate CMAC K1/K2 keys */
struct crypto_cipher *tfm_cipher;
enum ccp_engine engine;
enum ccp_aes_type type;
enum ccp_aes_mode mode;
struct scatterlist key_sg;
unsigned int key_len;
u8 key[AES_MAX_KEY_SIZE];
u8 nonce[CTR_RFC3686_NONCE_SIZE];
/* CMAC key structures */
struct scatterlist k1_sg;
struct scatterlist k2_sg;
unsigned int kn_len;
u8 k1[AES_BLOCK_SIZE];
u8 k2[AES_BLOCK_SIZE];
};
struct ccp_aes_req_ctx {
struct scatterlist iv_sg;
u8 iv[AES_BLOCK_SIZE];
/* Fields used for RFC3686 requests */
u8 *rfc3686_info;
u8 rfc3686_iv[AES_BLOCK_SIZE];
struct ccp_cmd cmd;
};
struct ccp_aes_cmac_req_ctx {
unsigned int null_msg;
unsigned int final;
unsigned int hash_cnt;
unsigned int hash_rem;
struct sg_table data_sg;
struct scatterlist iv_sg;
u8 iv[AES_BLOCK_SIZE];
struct scatterlist buf_sg;
unsigned int buf_count;
u8 buf[AES_BLOCK_SIZE];
struct scatterlist pad_sg;
unsigned int pad_count;
u8 pad[AES_BLOCK_SIZE];
struct ccp_cmd cmd;
};
/***** SHA related defines *****/
#define MAX_SHA_CONTEXT_SIZE SHA256_DIGEST_SIZE
#define MAX_SHA_BLOCK_SIZE SHA256_BLOCK_SIZE
struct ccp_sha_ctx {
unsigned int key_len;
u8 key[MAX_SHA_BLOCK_SIZE];
u8 ipad[MAX_SHA_BLOCK_SIZE];
u8 opad[MAX_SHA_BLOCK_SIZE];
struct crypto_ahash *hmac_tfm;
};
struct ccp_sha_req_ctx {
enum ccp_sha_type type;
u64 msg_bits;
unsigned int first;
unsigned int final;
unsigned int hash_cnt;
unsigned int hash_rem;
struct sg_table data_sg;
struct scatterlist ctx_sg;
u8 ctx[MAX_SHA_CONTEXT_SIZE];
struct scatterlist buf_sg;
unsigned int buf_count;
u8 buf[MAX_SHA_BLOCK_SIZE];
/* HMAC support field */
struct scatterlist pad_sg;
/* CCP driver command */
struct ccp_cmd cmd;
};
/***** Common Context Structure *****/
struct ccp_ctx {
int (*complete)(struct crypto_async_request *req, int ret);
union {
struct ccp_aes_ctx aes;
struct ccp_sha_ctx sha;
} u;
};
int ccp_crypto_enqueue_request(struct crypto_async_request *req,
struct ccp_cmd *cmd);
struct scatterlist *ccp_crypto_sg_table_add(struct sg_table *table,
struct scatterlist *sg_add);
int ccp_register_aes_algs(struct list_head *head);
int ccp_register_aes_cmac_algs(struct list_head *head);
int ccp_register_aes_xts_algs(struct list_head *head);
int ccp_register_sha_algs(struct list_head *head);
#endif
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