/* 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 */