432 lines
13 KiB
C
432 lines
13 KiB
C
/*
|
|
* Scatterlist Cryptographic API.
|
|
*
|
|
* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
|
|
* Copyright (c) 2002 David S. Miller (davem@redhat.com)
|
|
*
|
|
* Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no>
|
|
* and Nettle, by Niels Möller.
|
|
*
|
|
* 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.
|
|
*
|
|
*/
|
|
#ifndef _LINUX_CRYPTO_H
|
|
#define _LINUX_CRYPTO_H
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/types.h>
|
|
#include <linux/list.h>
|
|
#include <linux/string.h>
|
|
#include <asm/page.h>
|
|
|
|
/*
|
|
* Algorithm masks and types.
|
|
*/
|
|
#define CRYPTO_ALG_TYPE_MASK 0x000000ff
|
|
#define CRYPTO_ALG_TYPE_CIPHER 0x00000001
|
|
#define CRYPTO_ALG_TYPE_DIGEST 0x00000002
|
|
#define CRYPTO_ALG_TYPE_COMPRESS 0x00000004
|
|
|
|
/*
|
|
* Transform masks and values (for crt_flags).
|
|
*/
|
|
#define CRYPTO_TFM_MODE_MASK 0x000000ff
|
|
#define CRYPTO_TFM_REQ_MASK 0x000fff00
|
|
#define CRYPTO_TFM_RES_MASK 0xfff00000
|
|
|
|
#define CRYPTO_TFM_MODE_ECB 0x00000001
|
|
#define CRYPTO_TFM_MODE_CBC 0x00000002
|
|
#define CRYPTO_TFM_MODE_CFB 0x00000004
|
|
#define CRYPTO_TFM_MODE_CTR 0x00000008
|
|
|
|
#define CRYPTO_TFM_REQ_WEAK_KEY 0x00000100
|
|
#define CRYPTO_TFM_REQ_MAY_SLEEP 0x00000200
|
|
#define CRYPTO_TFM_RES_WEAK_KEY 0x00100000
|
|
#define CRYPTO_TFM_RES_BAD_KEY_LEN 0x00200000
|
|
#define CRYPTO_TFM_RES_BAD_KEY_SCHED 0x00400000
|
|
#define CRYPTO_TFM_RES_BAD_BLOCK_LEN 0x00800000
|
|
#define CRYPTO_TFM_RES_BAD_FLAGS 0x01000000
|
|
|
|
/*
|
|
* Miscellaneous stuff.
|
|
*/
|
|
#define CRYPTO_UNSPEC 0
|
|
#define CRYPTO_MAX_ALG_NAME 64
|
|
|
|
#define CRYPTO_DIR_ENCRYPT 1
|
|
#define CRYPTO_DIR_DECRYPT 0
|
|
|
|
struct scatterlist;
|
|
struct crypto_tfm;
|
|
|
|
struct cipher_desc {
|
|
struct crypto_tfm *tfm;
|
|
void (*crfn)(void *ctx, u8 *dst, const u8 *src);
|
|
unsigned int (*prfn)(const struct cipher_desc *desc, u8 *dst,
|
|
const u8 *src, unsigned int nbytes);
|
|
void *info;
|
|
};
|
|
|
|
/*
|
|
* Algorithms: modular crypto algorithm implementations, managed
|
|
* via crypto_register_alg() and crypto_unregister_alg().
|
|
*/
|
|
struct cipher_alg {
|
|
unsigned int cia_min_keysize;
|
|
unsigned int cia_max_keysize;
|
|
int (*cia_setkey)(void *ctx, const u8 *key,
|
|
unsigned int keylen, u32 *flags);
|
|
void (*cia_encrypt)(void *ctx, u8 *dst, const u8 *src);
|
|
void (*cia_decrypt)(void *ctx, u8 *dst, const u8 *src);
|
|
|
|
unsigned int (*cia_encrypt_ecb)(const struct cipher_desc *desc,
|
|
u8 *dst, const u8 *src,
|
|
unsigned int nbytes);
|
|
unsigned int (*cia_decrypt_ecb)(const struct cipher_desc *desc,
|
|
u8 *dst, const u8 *src,
|
|
unsigned int nbytes);
|
|
unsigned int (*cia_encrypt_cbc)(const struct cipher_desc *desc,
|
|
u8 *dst, const u8 *src,
|
|
unsigned int nbytes);
|
|
unsigned int (*cia_decrypt_cbc)(const struct cipher_desc *desc,
|
|
u8 *dst, const u8 *src,
|
|
unsigned int nbytes);
|
|
};
|
|
|
|
struct digest_alg {
|
|
unsigned int dia_digestsize;
|
|
void (*dia_init)(void *ctx);
|
|
void (*dia_update)(void *ctx, const u8 *data, unsigned int len);
|
|
void (*dia_final)(void *ctx, u8 *out);
|
|
int (*dia_setkey)(void *ctx, const u8 *key,
|
|
unsigned int keylen, u32 *flags);
|
|
};
|
|
|
|
struct compress_alg {
|
|
int (*coa_init)(void *ctx);
|
|
void (*coa_exit)(void *ctx);
|
|
int (*coa_compress)(void *ctx, const u8 *src, unsigned int slen,
|
|
u8 *dst, unsigned int *dlen);
|
|
int (*coa_decompress)(void *ctx, const u8 *src, unsigned int slen,
|
|
u8 *dst, unsigned int *dlen);
|
|
};
|
|
|
|
#define cra_cipher cra_u.cipher
|
|
#define cra_digest cra_u.digest
|
|
#define cra_compress cra_u.compress
|
|
|
|
struct crypto_alg {
|
|
struct list_head cra_list;
|
|
u32 cra_flags;
|
|
unsigned int cra_blocksize;
|
|
unsigned int cra_ctxsize;
|
|
unsigned int cra_alignmask;
|
|
const char cra_name[CRYPTO_MAX_ALG_NAME];
|
|
|
|
union {
|
|
struct cipher_alg cipher;
|
|
struct digest_alg digest;
|
|
struct compress_alg compress;
|
|
} cra_u;
|
|
|
|
struct module *cra_module;
|
|
};
|
|
|
|
/*
|
|
* Algorithm registration interface.
|
|
*/
|
|
int crypto_register_alg(struct crypto_alg *alg);
|
|
int crypto_unregister_alg(struct crypto_alg *alg);
|
|
|
|
/*
|
|
* Algorithm query interface.
|
|
*/
|
|
#ifdef CONFIG_CRYPTO
|
|
int crypto_alg_available(const char *name, u32 flags);
|
|
#else
|
|
static inline int crypto_alg_available(const char *name, u32 flags)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Transforms: user-instantiated objects which encapsulate algorithms
|
|
* and core processing logic. Managed via crypto_alloc_tfm() and
|
|
* crypto_free_tfm(), as well as the various helpers below.
|
|
*/
|
|
|
|
struct cipher_tfm {
|
|
void *cit_iv;
|
|
unsigned int cit_ivsize;
|
|
u32 cit_mode;
|
|
int (*cit_setkey)(struct crypto_tfm *tfm,
|
|
const u8 *key, unsigned int keylen);
|
|
int (*cit_encrypt)(struct crypto_tfm *tfm,
|
|
struct scatterlist *dst,
|
|
struct scatterlist *src,
|
|
unsigned int nbytes);
|
|
int (*cit_encrypt_iv)(struct crypto_tfm *tfm,
|
|
struct scatterlist *dst,
|
|
struct scatterlist *src,
|
|
unsigned int nbytes, u8 *iv);
|
|
int (*cit_decrypt)(struct crypto_tfm *tfm,
|
|
struct scatterlist *dst,
|
|
struct scatterlist *src,
|
|
unsigned int nbytes);
|
|
int (*cit_decrypt_iv)(struct crypto_tfm *tfm,
|
|
struct scatterlist *dst,
|
|
struct scatterlist *src,
|
|
unsigned int nbytes, u8 *iv);
|
|
void (*cit_xor_block)(u8 *dst, const u8 *src);
|
|
};
|
|
|
|
struct digest_tfm {
|
|
void (*dit_init)(struct crypto_tfm *tfm);
|
|
void (*dit_update)(struct crypto_tfm *tfm,
|
|
struct scatterlist *sg, unsigned int nsg);
|
|
void (*dit_final)(struct crypto_tfm *tfm, u8 *out);
|
|
void (*dit_digest)(struct crypto_tfm *tfm, struct scatterlist *sg,
|
|
unsigned int nsg, u8 *out);
|
|
int (*dit_setkey)(struct crypto_tfm *tfm,
|
|
const u8 *key, unsigned int keylen);
|
|
#ifdef CONFIG_CRYPTO_HMAC
|
|
void *dit_hmac_block;
|
|
#endif
|
|
};
|
|
|
|
struct compress_tfm {
|
|
int (*cot_compress)(struct crypto_tfm *tfm,
|
|
const u8 *src, unsigned int slen,
|
|
u8 *dst, unsigned int *dlen);
|
|
int (*cot_decompress)(struct crypto_tfm *tfm,
|
|
const u8 *src, unsigned int slen,
|
|
u8 *dst, unsigned int *dlen);
|
|
};
|
|
|
|
#define crt_cipher crt_u.cipher
|
|
#define crt_digest crt_u.digest
|
|
#define crt_compress crt_u.compress
|
|
|
|
struct crypto_tfm {
|
|
|
|
u32 crt_flags;
|
|
|
|
union {
|
|
struct cipher_tfm cipher;
|
|
struct digest_tfm digest;
|
|
struct compress_tfm compress;
|
|
} crt_u;
|
|
|
|
struct crypto_alg *__crt_alg;
|
|
};
|
|
|
|
/*
|
|
* Transform user interface.
|
|
*/
|
|
|
|
/*
|
|
* crypto_alloc_tfm() will first attempt to locate an already loaded algorithm.
|
|
* If that fails and the kernel supports dynamically loadable modules, it
|
|
* will then attempt to load a module of the same name or alias. A refcount
|
|
* is grabbed on the algorithm which is then associated with the new transform.
|
|
*
|
|
* crypto_free_tfm() frees up the transform and any associated resources,
|
|
* then drops the refcount on the associated algorithm.
|
|
*/
|
|
struct crypto_tfm *crypto_alloc_tfm(const char *alg_name, u32 tfm_flags);
|
|
void crypto_free_tfm(struct crypto_tfm *tfm);
|
|
|
|
/*
|
|
* Transform helpers which query the underlying algorithm.
|
|
*/
|
|
static inline const char *crypto_tfm_alg_name(struct crypto_tfm *tfm)
|
|
{
|
|
return tfm->__crt_alg->cra_name;
|
|
}
|
|
|
|
static inline const char *crypto_tfm_alg_modname(struct crypto_tfm *tfm)
|
|
{
|
|
return module_name(tfm->__crt_alg->cra_module);
|
|
}
|
|
|
|
static inline u32 crypto_tfm_alg_type(struct crypto_tfm *tfm)
|
|
{
|
|
return tfm->__crt_alg->cra_flags & CRYPTO_ALG_TYPE_MASK;
|
|
}
|
|
|
|
static inline unsigned int crypto_tfm_alg_min_keysize(struct crypto_tfm *tfm)
|
|
{
|
|
BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
|
|
return tfm->__crt_alg->cra_cipher.cia_min_keysize;
|
|
}
|
|
|
|
static inline unsigned int crypto_tfm_alg_max_keysize(struct crypto_tfm *tfm)
|
|
{
|
|
BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
|
|
return tfm->__crt_alg->cra_cipher.cia_max_keysize;
|
|
}
|
|
|
|
static inline unsigned int crypto_tfm_alg_ivsize(struct crypto_tfm *tfm)
|
|
{
|
|
BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
|
|
return tfm->crt_cipher.cit_ivsize;
|
|
}
|
|
|
|
static inline unsigned int crypto_tfm_alg_blocksize(struct crypto_tfm *tfm)
|
|
{
|
|
return tfm->__crt_alg->cra_blocksize;
|
|
}
|
|
|
|
static inline unsigned int crypto_tfm_alg_digestsize(struct crypto_tfm *tfm)
|
|
{
|
|
BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST);
|
|
return tfm->__crt_alg->cra_digest.dia_digestsize;
|
|
}
|
|
|
|
static inline unsigned int crypto_tfm_alg_alignmask(struct crypto_tfm *tfm)
|
|
{
|
|
return tfm->__crt_alg->cra_alignmask;
|
|
}
|
|
|
|
static inline void *crypto_tfm_ctx(struct crypto_tfm *tfm)
|
|
{
|
|
return (void *)&tfm[1];
|
|
}
|
|
|
|
/*
|
|
* API wrappers.
|
|
*/
|
|
static inline void crypto_digest_init(struct crypto_tfm *tfm)
|
|
{
|
|
BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST);
|
|
tfm->crt_digest.dit_init(tfm);
|
|
}
|
|
|
|
static inline void crypto_digest_update(struct crypto_tfm *tfm,
|
|
struct scatterlist *sg,
|
|
unsigned int nsg)
|
|
{
|
|
BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST);
|
|
tfm->crt_digest.dit_update(tfm, sg, nsg);
|
|
}
|
|
|
|
static inline void crypto_digest_final(struct crypto_tfm *tfm, u8 *out)
|
|
{
|
|
BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST);
|
|
tfm->crt_digest.dit_final(tfm, out);
|
|
}
|
|
|
|
static inline void crypto_digest_digest(struct crypto_tfm *tfm,
|
|
struct scatterlist *sg,
|
|
unsigned int nsg, u8 *out)
|
|
{
|
|
BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST);
|
|
tfm->crt_digest.dit_digest(tfm, sg, nsg, out);
|
|
}
|
|
|
|
static inline int crypto_digest_setkey(struct crypto_tfm *tfm,
|
|
const u8 *key, unsigned int keylen)
|
|
{
|
|
BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST);
|
|
if (tfm->crt_digest.dit_setkey == NULL)
|
|
return -ENOSYS;
|
|
return tfm->crt_digest.dit_setkey(tfm, key, keylen);
|
|
}
|
|
|
|
static inline int crypto_cipher_setkey(struct crypto_tfm *tfm,
|
|
const u8 *key, unsigned int keylen)
|
|
{
|
|
BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
|
|
return tfm->crt_cipher.cit_setkey(tfm, key, keylen);
|
|
}
|
|
|
|
static inline int crypto_cipher_encrypt(struct crypto_tfm *tfm,
|
|
struct scatterlist *dst,
|
|
struct scatterlist *src,
|
|
unsigned int nbytes)
|
|
{
|
|
BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
|
|
return tfm->crt_cipher.cit_encrypt(tfm, dst, src, nbytes);
|
|
}
|
|
|
|
static inline int crypto_cipher_encrypt_iv(struct crypto_tfm *tfm,
|
|
struct scatterlist *dst,
|
|
struct scatterlist *src,
|
|
unsigned int nbytes, u8 *iv)
|
|
{
|
|
BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
|
|
BUG_ON(tfm->crt_cipher.cit_mode == CRYPTO_TFM_MODE_ECB);
|
|
return tfm->crt_cipher.cit_encrypt_iv(tfm, dst, src, nbytes, iv);
|
|
}
|
|
|
|
static inline int crypto_cipher_decrypt(struct crypto_tfm *tfm,
|
|
struct scatterlist *dst,
|
|
struct scatterlist *src,
|
|
unsigned int nbytes)
|
|
{
|
|
BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
|
|
return tfm->crt_cipher.cit_decrypt(tfm, dst, src, nbytes);
|
|
}
|
|
|
|
static inline int crypto_cipher_decrypt_iv(struct crypto_tfm *tfm,
|
|
struct scatterlist *dst,
|
|
struct scatterlist *src,
|
|
unsigned int nbytes, u8 *iv)
|
|
{
|
|
BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
|
|
BUG_ON(tfm->crt_cipher.cit_mode == CRYPTO_TFM_MODE_ECB);
|
|
return tfm->crt_cipher.cit_decrypt_iv(tfm, dst, src, nbytes, iv);
|
|
}
|
|
|
|
static inline void crypto_cipher_set_iv(struct crypto_tfm *tfm,
|
|
const u8 *src, unsigned int len)
|
|
{
|
|
BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
|
|
memcpy(tfm->crt_cipher.cit_iv, src, len);
|
|
}
|
|
|
|
static inline void crypto_cipher_get_iv(struct crypto_tfm *tfm,
|
|
u8 *dst, unsigned int len)
|
|
{
|
|
BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
|
|
memcpy(dst, tfm->crt_cipher.cit_iv, len);
|
|
}
|
|
|
|
static inline int crypto_comp_compress(struct crypto_tfm *tfm,
|
|
const u8 *src, unsigned int slen,
|
|
u8 *dst, unsigned int *dlen)
|
|
{
|
|
BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_COMPRESS);
|
|
return tfm->crt_compress.cot_compress(tfm, src, slen, dst, dlen);
|
|
}
|
|
|
|
static inline int crypto_comp_decompress(struct crypto_tfm *tfm,
|
|
const u8 *src, unsigned int slen,
|
|
u8 *dst, unsigned int *dlen)
|
|
{
|
|
BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_COMPRESS);
|
|
return tfm->crt_compress.cot_decompress(tfm, src, slen, dst, dlen);
|
|
}
|
|
|
|
/*
|
|
* HMAC support.
|
|
*/
|
|
#ifdef CONFIG_CRYPTO_HMAC
|
|
void crypto_hmac_init(struct crypto_tfm *tfm, u8 *key, unsigned int *keylen);
|
|
void crypto_hmac_update(struct crypto_tfm *tfm,
|
|
struct scatterlist *sg, unsigned int nsg);
|
|
void crypto_hmac_final(struct crypto_tfm *tfm, u8 *key,
|
|
unsigned int *keylen, u8 *out);
|
|
void crypto_hmac(struct crypto_tfm *tfm, u8 *key, unsigned int *keylen,
|
|
struct scatterlist *sg, unsigned int nsg, u8 *out);
|
|
#endif /* CONFIG_CRYPTO_HMAC */
|
|
|
|
#endif /* _LINUX_CRYPTO_H */
|
|
|