[thirdparty/kernel/linux.git] / crypto / aead.c

/*
 * AEAD: Authenticated Encryption with Associated Data
 * 
 * This file provides API support for AEAD algorithms.
 *
 * Copyright (c) 2007 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/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/seq_file.h>

static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key,
			    unsigned int keylen)
{
	struct aead_alg *aead = crypto_aead_alg(tfm);
	unsigned long alignmask = crypto_aead_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 = aead->setkey(tfm, alignbuffer, keylen);
	memset(alignbuffer, 0, keylen);
	kfree(buffer);
	return ret;
}

static int setkey(struct crypto_aead *tfm, const u8 *key, unsigned int keylen)
{
	struct aead_alg *aead = crypto_aead_alg(tfm);
	unsigned long alignmask = crypto_aead_alignmask(tfm);

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

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

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

static int crypto_init_aead_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
{
	struct aead_alg *alg = &tfm->__crt_alg->cra_aead;
	struct aead_tfm *crt = &tfm->crt_aead;

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

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

	return 0;
}

static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
	__attribute__ ((unused));
static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
{
	struct aead_alg *aead = &alg->cra_aead;

	seq_printf(m, "type         : aead\n");
	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
	seq_printf(m, "ivsize       : %u\n", aead->ivsize);
	seq_printf(m, "authsize     : %u\n", aead->authsize);
}

const struct crypto_type crypto_aead_type = {
	.ctxsize = crypto_aead_ctxsize,
	.init = crypto_init_aead_ops,
#ifdef CONFIG_PROC_FS
	.show = crypto_aead_show,
#endif
};
EXPORT_SYMBOL_GPL(crypto_aead_type);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");
Commit	Line	Data
1ae97820 HX	1	/*
	2	* AEAD: Authenticated Encryption with Associated Data
	3	*
	4	* This file provides API support for AEAD algorithms.
	5	*
	6	* Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.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
	15	#include <crypto/algapi.h>
	16	#include <linux/errno.h>
	17	#include <linux/init.h>
	18	#include <linux/kernel.h>
	19	#include <linux/module.h>
	20	#include <linux/slab.h>
	21	#include <linux/seq_file.h>
	22
	23	static int setkey_unaligned(struct crypto_aead tfm, const u8 key,
	24	unsigned int keylen)
	25	{
	26	struct aead_alg *aead = crypto_aead_alg(tfm);
	27	unsigned long alignmask = crypto_aead_alignmask(tfm);
	28	int ret;
	29	u8 buffer, alignbuffer;
	30	unsigned long absize;
	31
	32	absize = keylen + alignmask;
	33	buffer = kmalloc(absize, GFP_ATOMIC);
	34	if (!buffer)
	35	return -ENOMEM;
	36
	37	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	38	memcpy(alignbuffer, key, keylen);
	39	ret = aead->setkey(tfm, alignbuffer, keylen);
	40	memset(alignbuffer, 0, keylen);
	41	kfree(buffer);
	42	return ret;
	43	}
	44
	45	static int setkey(struct crypto_aead tfm, const u8 key, unsigned int keylen)
	46	{
	47	struct aead_alg *aead = crypto_aead_alg(tfm);
	48	unsigned long alignmask = crypto_aead_alignmask(tfm);
	49
	50	if ((unsigned long)key & alignmask)
	51	return setkey_unaligned(tfm, key, keylen);
	52
	53	return aead->setkey(tfm, key, keylen);
	54	}
	55
	56	static unsigned int crypto_aead_ctxsize(struct crypto_alg *alg, u32 type,
	57	u32 mask)
	58	{
	59	return alg->cra_ctxsize;
	60	}
	61
	62	static int crypto_init_aead_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
	63	{
	64	struct aead_alg *alg = &tfm->__crt_alg->cra_aead;
65	struct aead_tfm *crt = &tfm->crt_aead;
66
67	if (max(alg->authsize, alg->ivsize) > PAGE_SIZE / 8)
68	return -EINVAL;
69
70	crt->setkey = setkey;
71	crt->encrypt = alg->encrypt;
72	crt->decrypt = alg->decrypt;
73	crt->ivsize = alg->ivsize;
74	crt->authsize = alg->authsize;
75
76	return 0;
77	}
78
79	static void crypto_aead_show(struct seq_file m, struct crypto_alg alg)
80	__attribute__ ((unused));
81	static void crypto_aead_show(struct seq_file m, struct crypto_alg alg)
82	{
83	struct aead_alg *aead = &alg->cra_aead;
84
85	seq_printf(m, "type : aead\n");
86	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
87	seq_printf(m, "ivsize : %u\n", aead->ivsize);
88	seq_printf(m, "authsize : %u\n", aead->authsize);
89	}
90
91	const struct crypto_type crypto_aead_type = {
92	.ctxsize = crypto_aead_ctxsize,
93	.init = crypto_init_aead_ops,
94	#ifdef CONFIG_PROC_FS
95	.show = crypto_aead_show,
96	#endif
97	};
98	EXPORT_SYMBOL_GPL(crypto_aead_type);
99
100	MODULE_LICENSE("GPL");
101	MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");