1/*
  2 * Cryptographic API.
  3 *
  4 * Digest operations.
  5 *
  6 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
  7 *
  8 * This program is free software; you can redistribute it and/or modify it
  9 * under the terms of the GNU General Public License as published by the Free
 10 * Software Foundation; either version 2 of the License, or (at your option)
 11 * any later version.
 12 *
 13 */
 14//#include <linux/crypto.h>
 15#include "rtl_crypto.h"
 16#include <linux/mm.h>
 17#include <linux/errno.h>
 18#include <linux/highmem.h>
 19#include <asm/scatterlist.h>
 20#include "internal.h"
 21
 22static void init(struct crypto_tfm *tfm)
 23{
 24	tfm->__crt_alg->cra_digest.dia_init(crypto_tfm_ctx(tfm));
 25}
 26
 27static void update(struct crypto_tfm *tfm,
 28		   struct scatterlist *sg, unsigned int nsg)
 29{
 30	unsigned int i;
 31
 32	for (i = 0; i < nsg; i++) {
 33
 34		struct page *pg = sg[i].page;
 35		unsigned int offset = sg[i].offset;
 36		unsigned int l = sg[i].length;
 37
 38		do {
 39			unsigned int bytes_from_page = min(l, ((unsigned int)
 40							   (PAGE_SIZE)) -
 41							   offset);
 42			char *p = kmap_atomic(pg) + offset;
 43
 44			tfm->__crt_alg->cra_digest.dia_update
 45					(crypto_tfm_ctx(tfm), p,
 46					 bytes_from_page);
 47			kunmap_atomic(p);
 48			crypto_yield(tfm);
 49			offset = 0;
 50			pg++;
 51			l -= bytes_from_page;
 52		} while (l > 0);
 53	}
 54}
 55
 56static void final(struct crypto_tfm *tfm, u8 *out)
 57{
 58	tfm->__crt_alg->cra_digest.dia_final(crypto_tfm_ctx(tfm), out);
 59}
 60
 61static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
 62{
 63	u32 flags;
 64	if (tfm->__crt_alg->cra_digest.dia_setkey == NULL)
 65		return -ENOSYS;
 66	return tfm->__crt_alg->cra_digest.dia_setkey(crypto_tfm_ctx(tfm),
 67						     key, keylen, &flags);
 68}
 69
 70static void digest(struct crypto_tfm *tfm,
 71		   struct scatterlist *sg, unsigned int nsg, u8 *out)
 72{
 73	unsigned int i;
 74
 75	tfm->crt_digest.dit_init(tfm);
 76
 77	for (i = 0; i < nsg; i++) {
 78		char *p = kmap_atomic(sg[i].page) + sg[i].offset;
 79		tfm->__crt_alg->cra_digest.dia_update(crypto_tfm_ctx(tfm),
 80						      p, sg[i].length);
 81		kunmap_atomic(p);
 82		crypto_yield(tfm);
 83	}
 84	crypto_digest_final(tfm, out);
 85}
 86
 87int crypto_init_digest_flags(struct crypto_tfm *tfm, u32 flags)
 88{
 89	return flags ? -EINVAL : 0;
 90}
 91
 92int crypto_init_digest_ops(struct crypto_tfm *tfm)
 93{
 94	struct digest_tfm *ops = &tfm->crt_digest;
 95
 96	ops->dit_init	= init;
 97	ops->dit_update	= update;
 98	ops->dit_final	= final;
 99	ops->dit_digest	= digest;
100	ops->dit_setkey	= setkey;
101
102	return crypto_alloc_hmac_block(tfm);
103}
104
105void crypto_exit_digest_ops(struct crypto_tfm *tfm)
106{
107	crypto_free_hmac_block(tfm);
108}