/*
 * Copyright (c) 2010-2014, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * 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 for more details.
 */

#ifndef _SHA_H_
#define _SHA_H_

#include <crypto/scatterwalk.h>
#include <crypto/sha.h>

#include "common.h"
#include "core.h"

#define QCE_SHA_MAX_BLOCKSIZE		SHA256_BLOCK_SIZE
#define QCE_SHA_MAX_DIGESTSIZE		SHA256_DIGEST_SIZE

struct qce_sha_ctx {
	u8 authkey[QCE_SHA_MAX_BLOCKSIZE];
};

/**
 * struct qce_sha_reqctx - holds private ahash objects per request
 * @buf: used during update, import and export
 * @tmpbuf: buffer for internal use
 * @digest: calculated digest buffer
 * @buflen: length of the buffer
 * @flags: operation flags
 * @src_orig: original request sg list
 * @nbytes_orig: original request number of bytes
 * @src_nents: source number of entries
 * @byte_count: byte count
 * @count: save count in states during update, import and export
 * @first_blk: is it the first block
 * @last_blk: is it the last block
 * @sg: used to chain sg lists
 * @authkey: pointer to auth key in sha ctx
 * @authklen: auth key length
 * @result_sg: scatterlist used for result buffer
 */
struct qce_sha_reqctx {
	u8 buf[QCE_SHA_MAX_BLOCKSIZE];
	u8 tmpbuf[QCE_SHA_MAX_BLOCKSIZE];
	u8 digest[QCE_SHA_MAX_DIGESTSIZE];
	unsigned int buflen;
	unsigned long flags;
	struct scatterlist *src_orig;
	unsigned int nbytes_orig;
	int src_nents;
	__be32 byte_count[2];
	u64 count;
	bool first_blk;
	bool last_blk;
	struct scatterlist sg[2];
	u8 *authkey;
	unsigned int authklen;
	struct scatterlist result_sg;
};

static inline struct qce_alg_template *to_ahash_tmpl(struct crypto_tfm *tfm)
{
	struct crypto_ahash *ahash = __crypto_ahash_cast(tfm);
	struct ahash_alg *alg = container_of(crypto_hash_alg_common(ahash),
					     struct ahash_alg, halg);

	return container_of(alg, struct qce_alg_template, alg.ahash);
}

extern const struct qce_algo_ops ahash_ops;

#endif /* _SHA_H_ */