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/* SPDX-License-Identifier: GPL-2.0 */
/*
* AES-CBC and AES-CBC-CTS unauthenticated encryption and decryption
*
* Copyright 2026 Google LLC
*/
#ifndef _CRYPTO_AES_CBC_H
#define _CRYPTO_AES_CBC_H
#include <crypto/aes.h>
/**
* aes_cbc_encrypt() - Encrypt data using AES-CBC
* @dst: The destination buffer. Can be in-place or out-of-place. For other
* overlaps the behavior is unspecified.
* @src: The source data
* @len: Number of bytes to encrypt. Must be a multiple of AES_BLOCK_SIZE.
* @iv: The initialization vector. It is updated with the next value, i.e. the
* last ciphertext block (or left unchanged if @len == 0).
* @key: The key, already prepared using aes_preparekey() or aes_prepareenckey()
*
* This supports incremental encryption. The length of each chunk must be a
* multiple of AES_BLOCK_SIZE, and the updated @iv must be passed in each time.
*
* Context: Any context.
*/
void aes_cbc_encrypt(u8 *dst, const u8 *src, size_t len,
u8 iv[at_least AES_BLOCK_SIZE], aes_encrypt_arg key);
/**
* aes_cbc_decrypt() - Decrypt data using AES-CBC
* @dst: The destination buffer. Can be in-place or out-of-place. For other
* overlaps the behavior is unspecified.
* @src: The source data
* @len: Number of bytes to decrypt. Must be a multiple of AES_BLOCK_SIZE.
* @iv: The initialization vector. It is updated with the next value, i.e. the
* last ciphertext block (or left unchanged if @len == 0).
* @key: The key, already prepared using aes_preparekey()
*
* This supports incremental decryption. The length of each chunk must be a
* multiple of AES_BLOCK_SIZE, and the updated @iv must be passed in each time.
*
* Context: Any context.
*/
void aes_cbc_decrypt(u8 *dst, const u8 *src, size_t len,
u8 iv[at_least AES_BLOCK_SIZE], const struct aes_key *key);
/**
* aes_cbc_cts_encrypt() - Encrypt data using AES-CBC-CTS (CS3 variant)
* @dst: The destination buffer. Can be in-place or out-of-place. For other
* overlaps the behavior is unspecified.
* @src: The source data
* @len: Number of bytes to encrypt, at least AES_BLOCK_SIZE
* @iv: The initialization vector, clobbered by this function
* @key: The key, already prepared using aes_preparekey() or aes_prepareenckey()
*
* Context: Any context.
*/
void aes_cbc_cts_encrypt(u8 *dst, const u8 *src, size_t len,
u8 iv[at_least AES_BLOCK_SIZE], aes_encrypt_arg key);
/**
* aes_cbc_cts_decrypt() - Decrypt data using AES-CBC-CTS (CS3 variant)
* @dst: The destination buffer. Can be in-place or out-of-place. For other
* overlaps the behavior is unspecified.
* @src: The source data
* @len: Number of bytes to decrypt, at least AES_BLOCK_SIZE
* @iv: The initialization vector, clobbered by this function
* @key: The key, already prepared using aes_preparekey()
*
* Context: Any context.
*/
void aes_cbc_cts_decrypt(u8 *dst, const u8 *src, size_t len,
u8 iv[at_least AES_BLOCK_SIZE],
const struct aes_key *key);
#endif /* _CRYPTO_AES_CBC_H */
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