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