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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
* Copyright (c) 2002 David S. Miller (davem@redhat.com)
* Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
*
* Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no>
* and Nettle, by Niels Möller.
*/
#ifndef _CRYPTO_INTERNAL_CIPHER_H
#define _CRYPTO_INTERNAL_CIPHER_H
#include <crypto/algapi.h>
struct crypto_cipher {
struct crypto_tfm base;
};
/**
* DOC: Single Block Cipher API
*
* The single block cipher API is used with the ciphers of type
* CRYPTO_ALG_TYPE_CIPHER (listed as type "cipher" in /proc/crypto).
*
* Using the single block cipher API calls, operations with the basic cipher
* primitive can be implemented. These cipher primitives exclude any block
* chaining operations including IV handling.
*
* The purpose of this single block cipher API is to support the implementation
* of templates or other concepts that only need to perform the cipher operation
* on one block at a time. Templates invoke the underlying cipher primitive
* block-wise and process either the input or the output data of these cipher
* operations.
*/
static inline struct crypto_cipher *__crypto_cipher_cast(struct crypto_tfm *tfm)
{
return (struct crypto_cipher *)tfm;
}
/**
* crypto_alloc_cipher() - allocate single block cipher handle
* @alg_name: is the cra_name / name or cra_driver_name / driver name of the
* single block cipher
* @type: specifies the type of the cipher
* @mask: specifies the mask for the cipher
*
* Allocate a cipher handle for a single block cipher. The returned struct
* crypto_cipher is the cipher handle that is required for any subsequent API
* invocation for that single block cipher.
*
* Return: allocated cipher handle in case of success; IS_ERR() is true in case
* of an error, PTR_ERR() returns the error code.
*/
static inline struct crypto_cipher *crypto_alloc_cipher(const char *alg_name,
u32 type, u32 mask)
{
type &= ~CRYPTO_ALG_TYPE_MASK;
type |= CRYPTO_ALG_TYPE_CIPHER;
mask |= CRYPTO_ALG_TYPE_MASK;
return __crypto_cipher_cast(crypto_alloc_base(alg_name, type, mask));
}
static inline struct crypto_tfm *crypto_cipher_tfm(struct crypto_cipher *tfm)
{
return &tfm->base;
}
/**
* crypto_free_cipher() - zeroize and free the single block cipher handle
* @tfm: cipher handle to be freed
*/
static inline void crypto_free_cipher(struct crypto_cipher *tfm)
{
crypto_free_tfm(crypto_cipher_tfm(tfm));
}
/**
* crypto_has_cipher() - Search for the availability of a single block cipher
* @alg_name: is the cra_name / name or cra_driver_name / driver name of the
* single block cipher
* @type: specifies the type of the cipher
* @mask: specifies the mask for the cipher
*
* Return: true when the single block cipher is known to the kernel crypto API;
* false otherwise
*/
static inline int crypto_has_cipher(const char *alg_name, u32 type, u32 mask)
{
type &= ~CRYPTO_ALG_TYPE_MASK;
type |= CRYPTO_ALG_TYPE_CIPHER;
mask |= CRYPTO_ALG_TYPE_MASK;
return crypto_has_alg(alg_name, type, mask);
}
/**
* crypto_cipher_blocksize() - obtain block size for cipher
* @tfm: cipher handle
*
* The block size for the single block cipher referenced with the cipher handle
* tfm is returned. The caller may use that information to allocate appropriate
* memory for the data returned by the encryption or decryption operation
*
* Return: block size of cipher
*/
static inline unsigned int crypto_cipher_blocksize(struct crypto_cipher *tfm)
{
return crypto_tfm_alg_blocksize(crypto_cipher_tfm(tfm));
}
static inline unsigned int crypto_cipher_alignmask(struct crypto_cipher *tfm)
{
return crypto_tfm_alg_alignmask(crypto_cipher_tfm(tfm));
}
static inline u32 crypto_cipher_get_flags(struct crypto_cipher *tfm)
{
return crypto_tfm_get_flags(crypto_cipher_tfm(tfm));
}
static inline void crypto_cipher_set_flags(struct crypto_cipher *tfm,
u32 flags)
{
crypto_tfm_set_flags(crypto_cipher_tfm(tfm), flags);
}
static inline void crypto_cipher_clear_flags(struct crypto_cipher *tfm,
u32 flags)
{
crypto_tfm_clear_flags(crypto_cipher_tfm(tfm), flags);
}
/**
* crypto_cipher_setkey() - set key for cipher
* @tfm: cipher handle
* @key: buffer holding the key
* @keylen: length of the key in bytes
*
* The caller provided key is set for the single block cipher referenced by the
* cipher handle.
*
* Note, the key length determines the cipher type. Many block ciphers implement
* different cipher modes depending on the key size, such as AES-128 vs AES-192
* vs. AES-256. When providing a 16 byte key for an AES cipher handle, AES-128
* is performed.
*
* Return: 0 if the setting of the key was successful; < 0 if an error occurred
*/
int crypto_cipher_setkey(struct crypto_cipher *tfm,
const u8 *key, unsigned int keylen);
/**
* crypto_cipher_encrypt_one() - encrypt one block of plaintext
* @tfm: cipher handle
* @dst: points to the buffer that will be filled with the ciphertext
* @src: buffer holding the plaintext to be encrypted
*
* Invoke the encryption operation of one block. The caller must ensure that
* the plaintext and ciphertext buffers are at least one block in size.
*/
void crypto_cipher_encrypt_one(struct crypto_cipher *tfm,
u8 *dst, const u8 *src);
/**
* crypto_cipher_decrypt_one() - decrypt one block of ciphertext
* @tfm: cipher handle
* @dst: points to the buffer that will be filled with the plaintext
* @src: buffer holding the ciphertext to be decrypted
*
* Invoke the decryption operation of one block. The caller must ensure that
* the plaintext and ciphertext buffers are at least one block in size.
*/
void crypto_cipher_decrypt_one(struct crypto_cipher *tfm,
u8 *dst, const u8 *src);
struct crypto_cipher_spawn {
struct crypto_spawn base;
};
static inline int crypto_grab_cipher(struct crypto_cipher_spawn *spawn,
struct crypto_instance *inst,
const char *name, u32 type, u32 mask)
{
type &= ~CRYPTO_ALG_TYPE_MASK;
type |= CRYPTO_ALG_TYPE_CIPHER;
mask |= CRYPTO_ALG_TYPE_MASK;
return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
}
static inline void crypto_drop_cipher(struct crypto_cipher_spawn *spawn)
{
crypto_drop_spawn(&spawn->base);
}
static inline struct crypto_alg *crypto_spawn_cipher_alg(
struct crypto_cipher_spawn *spawn)
{
return spawn->base.alg;
}
static inline struct crypto_cipher *crypto_spawn_cipher(
struct crypto_cipher_spawn *spawn)
{
u32 type = CRYPTO_ALG_TYPE_CIPHER;
u32 mask = CRYPTO_ALG_TYPE_MASK;
return __crypto_cipher_cast(crypto_spawn_tfm(&spawn->base, type, mask));
}
static inline struct cipher_alg *crypto_cipher_alg(struct crypto_cipher *tfm)
{
return &crypto_cipher_tfm(tfm)->__crt_alg->cra_cipher;
}
#endif
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