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/*
* 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/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_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
struct scatterlist;
/*
* 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);
};
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);
};
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;
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.
*/
int crypto_alg_available(const char *name, u32 flags);
/*
* 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 crypto_tfm;
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);
#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;
}
/*
* 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_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 */