[deliverable/linux.git] / crypto / digest.c

/*
 * Cryptographic API.
 *
 * Digest operations.
 *
 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option) 
 * any later version.
 *
 */
#include <linux/crypto.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/highmem.h>
#include <asm/scatterlist.h>
#include "internal.h"

static void init(struct crypto_tfm *tfm)
{
	tfm->__crt_alg->cra_digest.dia_init(tfm);
}

static void update(struct crypto_tfm *tfm,
                   struct scatterlist *sg, unsigned int nsg)
{
	unsigned int i;
	unsigned int alignmask = crypto_tfm_alg_alignmask(tfm);

	for (i = 0; i < nsg; i++) {

		struct page *pg = sg[i].page;
		unsigned int offset = sg[i].offset;
		unsigned int l = sg[i].length;

		do {
			unsigned int bytes_from_page = min(l, ((unsigned int)
							   (PAGE_SIZE)) - 
							   offset);
			char *src = crypto_kmap(pg, 0);
			char *p = src + offset;

			if (unlikely(offset & alignmask)) {
				unsigned int bytes =
					alignmask + 1 - (offset & alignmask);
				bytes = min(bytes, bytes_from_page);
				tfm->__crt_alg->cra_digest.dia_update(tfm, p,
								      bytes);
				p += bytes;
				bytes_from_page -= bytes;
				l -= bytes;
			}
			tfm->__crt_alg->cra_digest.dia_update(tfm, p,
							      bytes_from_page);
			crypto_kunmap(src, 0);
			crypto_yield(tfm->crt_flags);
			offset = 0;
			pg++;
			l -= bytes_from_page;
		} while (l > 0);
	}
}

static void final(struct crypto_tfm *tfm, u8 *out)
{
	unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
	struct digest_alg *digest = &tfm->__crt_alg->cra_digest;

	if (unlikely((unsigned long)out & alignmask)) {
		unsigned long align = alignmask + 1;
		unsigned long addr = (unsigned long)crypto_tfm_ctx(tfm);
		u8 *dst = (u8 *)ALIGN(addr, align) +
			  ALIGN(tfm->__crt_alg->cra_ctxsize, align);

		digest->dia_final(tfm, dst);
		memcpy(out, dst, digest->dia_digestsize);
	} else
		digest->dia_final(tfm, out);
}

static int nosetkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
{
	tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
	return -ENOSYS;
}

static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
{
	tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
	return tfm->__crt_alg->cra_digest.dia_setkey(tfm, key, keylen);
}

static void digest(struct crypto_tfm *tfm,
                   struct scatterlist *sg, unsigned int nsg, u8 *out)
{
	init(tfm);
	update(tfm, sg, nsg);
	final(tfm, out);
}

int crypto_init_digest_flags(struct crypto_tfm *tfm, u32 flags)
{
	return flags ? -EINVAL : 0;
}

int crypto_init_digest_ops(struct crypto_tfm *tfm)
{
	struct digest_tfm *ops = &tfm->crt_digest;
	struct digest_alg *dalg = &tfm->__crt_alg->cra_digest;
	
	ops->dit_init	= init;
	ops->dit_update	= update;
	ops->dit_final	= final;
	ops->dit_digest	= digest;
	ops->dit_setkey	= dalg->dia_setkey ? setkey : nosetkey;
	
	return crypto_alloc_hmac_block(tfm);
}

void crypto_exit_digest_ops(struct crypto_tfm *tfm)
{
	crypto_free_hmac_block(tfm);
}
Commit	Line	Data
1da177e4 LT	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 <linux/mm.h>
	16	#include <linux/errno.h>
	17	#include <linux/highmem.h>
	18	#include <asm/scatterlist.h>
	19	#include "internal.h"
	20
	21	static void init(struct crypto_tfm *tfm)
	22	{
6c2bb98b	23	tfm->__crt_alg->cra_digest.dia_init(tfm);
1da177e4 LT	24	}
	25
	26	static void update(struct crypto_tfm *tfm,
	27	struct scatterlist *sg, unsigned int nsg)
	28	{
	29	unsigned int i;
e1147d8f	30	unsigned int alignmask = crypto_tfm_alg_alignmask(tfm);
1da177e4 LT	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);
e1147d8f AN	42	char *src = crypto_kmap(pg, 0);
e1147d8f AN	43	char *p = src + offset;
1da177e4	44
e1147d8f AN	45	if (unlikely(offset & alignmask)) {
	46	unsigned int bytes =
	47	alignmask + 1 - (offset & alignmask);
	48	bytes = min(bytes, bytes_from_page);
6c2bb98b HX	49	tfm->__crt_alg->cra_digest.dia_update(tfm, p,
6c2bb98b HX	50	bytes);
e1147d8f AN	51	p += bytes;
	52	bytes_from_page -= bytes;
	53	l -= bytes;
	54	}
6c2bb98b HX	55	tfm->__crt_alg->cra_digest.dia_update(tfm, p,
6c2bb98b HX	56	bytes_from_page);
e1147d8f	57	crypto_kunmap(src, 0);
8f21cf0d	58	crypto_yield(tfm->crt_flags);
1da177e4 LT	59	offset = 0;
	60	pg++;
	61	l -= bytes_from_page;
	62	} while (l > 0);
	63	}
	64	}
	65
	66	static void final(struct crypto_tfm tfm, u8 out)
	67	{
e1147d8f	68	unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
ee756416 HX	69	struct digest_alg *digest = &tfm->__crt_alg->cra_digest;
ee756416 HX	70
e1147d8f	71	if (unlikely((unsigned long)out & alignmask)) {
ee756416 HX	72	unsigned long align = alignmask + 1;
	73	unsigned long addr = (unsigned long)crypto_tfm_ctx(tfm);
	74	u8 dst = (u8 )ALIGN(addr, align) +
	75	ALIGN(tfm->__crt_alg->cra_ctxsize, align);
	76
	77	digest->dia_final(tfm, dst);
	78	memcpy(out, dst, digest->dia_digestsize);
e1147d8f	79	} else
ee756416	80	digest->dia_final(tfm, out);
1da177e4 LT	81	}
1da177e4 LT	82
560c06ae HX	83	static int nosetkey(struct crypto_tfm tfm, const u8 key, unsigned int keylen)
	84	{
	85	tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
	86	return -ENOSYS;
	87	}
	88
1da177e4 LT	89	static int setkey(struct crypto_tfm tfm, const u8 key, unsigned int keylen)
1da177e4 LT	90	{
560c06ae HX	91	tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
560c06ae HX	92	return tfm->__crt_alg->cra_digest.dia_setkey(tfm, key, keylen);
1da177e4 LT	93	}
	94
	95	static void digest(struct crypto_tfm *tfm,
	96	struct scatterlist sg, unsigned int nsg, u8 out)
	97	{
e1147d8f AN	98	init(tfm);
	99	update(tfm, sg, nsg);
	100	final(tfm, out);
1da177e4 LT	101	}
	102
	103	int crypto_init_digest_flags(struct crypto_tfm *tfm, u32 flags)
	104	{
	105	return flags ? -EINVAL : 0;
	106	}
	107
	108	int crypto_init_digest_ops(struct crypto_tfm *tfm)
	109	{
	110	struct digest_tfm *ops = &tfm->crt_digest;
560c06ae	111	struct digest_alg *dalg = &tfm->__crt_alg->cra_digest;
1da177e4 LT	112
	113	ops->dit_init = init;
	114	ops->dit_update = update;
	115	ops->dit_final = final;
	116	ops->dit_digest = digest;
560c06ae	117	ops->dit_setkey = dalg->dia_setkey ? setkey : nosetkey;
1da177e4 LT	118
	119	return crypto_alloc_hmac_block(tfm);
	120	}
	121
	122	void crypto_exit_digest_ops(struct crypto_tfm *tfm)
	123	{
	124	crypto_free_hmac_block(tfm);
	125	}