[net-next-2.6.git] / crypto / ablkcipher.c

/*
 * Asynchronous block chaining cipher operations.
 * 
 * This is the asynchronous version of blkcipher.c indicating completion
 * via a callback.
 *
 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.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 <crypto/algapi.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/seq_file.h>

static int setkey_unaligned(struct crypto_ablkcipher *tfm, const u8 *key, unsigned int keylen)
{
	struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
	unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
	int ret;
	u8 *buffer, *alignbuffer;
	unsigned long absize;

	absize = keylen + alignmask;
	buffer = kmalloc(absize, GFP_ATOMIC);
	if (!buffer)
		return -ENOMEM;

	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	memcpy(alignbuffer, key, keylen);
	ret = cipher->setkey(tfm, alignbuffer, keylen);
	memset(alignbuffer, 0, keylen);
	kfree(buffer);
	return ret;
}

static int setkey(struct crypto_ablkcipher *tfm, const u8 *key,
		  unsigned int keylen)
{
	struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
	unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);

	if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
		crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
		return -EINVAL;
	}

	if ((unsigned long)key & alignmask)
		return setkey_unaligned(tfm, key, keylen);

	return cipher->setkey(tfm, key, keylen);
}

static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type,
					      u32 mask)
{
	return alg->cra_ctxsize;
}

static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type,
				      u32 mask)
{
	struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
	struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;

	if (alg->ivsize > PAGE_SIZE / 8)
		return -EINVAL;

	crt->setkey = setkey;
	crt->encrypt = alg->encrypt;
	crt->decrypt = alg->decrypt;
	crt->ivsize = alg->ivsize;

	return 0;
}

static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
	__attribute__ ((unused));
static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
{
	struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;

	seq_printf(m, "type         : ablkcipher\n");
	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
	seq_printf(m, "min keysize  : %u\n", ablkcipher->min_keysize);
	seq_printf(m, "max keysize  : %u\n", ablkcipher->max_keysize);
	seq_printf(m, "ivsize       : %u\n", ablkcipher->ivsize);
	if (ablkcipher->queue) {
		seq_printf(m, "qlen         : %u\n", ablkcipher->queue->qlen);
		seq_printf(m, "max qlen     : %u\n", ablkcipher->queue->max_qlen);
	}
}

const struct crypto_type crypto_ablkcipher_type = {
	.ctxsize = crypto_ablkcipher_ctxsize,
	.init = crypto_init_ablkcipher_ops,
#ifdef CONFIG_PROC_FS
	.show = crypto_ablkcipher_show,
#endif
};
EXPORT_SYMBOL_GPL(crypto_ablkcipher_type);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Asynchronous block chaining cipher type");
Commit	Line	Data
b5b7f088 HX	1	/*
	2	* Asynchronous block chaining cipher operations.
	3	*
	4	* This is the asynchronous version of blkcipher.c indicating completion
	5	* via a callback.
	6	*
	7	* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
	8	*
	9	* This program is free software; you can redistribute it and/or modify it
	10	* under the terms of the GNU General Public License as published by the Free
	11	* Software Foundation; either version 2 of the License, or (at your option)
	12	* any later version.
	13	*
	14	*/
	15
	16	#include <crypto/algapi.h>
	17	#include <linux/errno.h>
	18	#include <linux/init.h>
	19	#include <linux/module.h>
	20	#include <linux/seq_file.h>
	21
ca7c3938 SS	22	static int setkey_unaligned(struct crypto_ablkcipher tfm, const u8 key, unsigned int keylen)
	23	{
	24	struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
	25	unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
	26	int ret;
	27	u8 buffer, alignbuffer;
	28	unsigned long absize;
	29
	30	absize = keylen + alignmask;
	31	buffer = kmalloc(absize, GFP_ATOMIC);
	32	if (!buffer)
	33	return -ENOMEM;
	34
	35	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	36	memcpy(alignbuffer, key, keylen);
	37	ret = cipher->setkey(tfm, alignbuffer, keylen);
06817176	38	memset(alignbuffer, 0, keylen);
ca7c3938 SS	39	kfree(buffer);
	40	return ret;
	41	}
	42
b5b7f088 HX	43	static int setkey(struct crypto_ablkcipher tfm, const u8 key,
	44	unsigned int keylen)
	45	{
	46	struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
ca7c3938	47	unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
b5b7f088 HX	48
	49	if (keylen < cipher->min_keysize \|\| keylen > cipher->max_keysize) {
	50	crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
	51	return -EINVAL;
	52	}
	53
ca7c3938 SS	54	if ((unsigned long)key & alignmask)
	55	return setkey_unaligned(tfm, key, keylen);
	56
b5b7f088 HX	57	return cipher->setkey(tfm, key, keylen);
	58	}
	59
	60	static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type,
	61	u32 mask)
	62	{
	63	return alg->cra_ctxsize;
	64	}
	65
	66	static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type,
	67	u32 mask)
	68	{
	69	struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
	70	struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
	71
	72	if (alg->ivsize > PAGE_SIZE / 8)
	73	return -EINVAL;
	74
	75	crt->setkey = setkey;
	76	crt->encrypt = alg->encrypt;
	77	crt->decrypt = alg->decrypt;
	78	crt->ivsize = alg->ivsize;
	79
	80	return 0;
	81	}
	82
	83	static void crypto_ablkcipher_show(struct seq_file m, struct crypto_alg alg)
	84	__attribute__ ((unused));
	85	static void crypto_ablkcipher_show(struct seq_file m, struct crypto_alg alg)
	86	{
	87	struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
	88
	89	seq_printf(m, "type : ablkcipher\n");
	90	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	91	seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
	92	seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
	93	seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
e559e91c SS	94	if (ablkcipher->queue) {
	95	seq_printf(m, "qlen : %u\n", ablkcipher->queue->qlen);
	96	seq_printf(m, "max qlen : %u\n", ablkcipher->queue->max_qlen);
	97	}
b5b7f088 HX	98	}
	99
	100	const struct crypto_type crypto_ablkcipher_type = {
	101	.ctxsize = crypto_ablkcipher_ctxsize,
	102	.init = crypto_init_ablkcipher_ops,
	103	#ifdef CONFIG_PROC_FS
	104	.show = crypto_ablkcipher_show,
	105	#endif
	106	};
	107	EXPORT_SYMBOL_GPL(crypto_ablkcipher_type);
	108
	109	MODULE_LICENSE("GPL");
	110	MODULE_DESCRIPTION("Asynchronous block chaining cipher type");